From: KR-net users group digest[SMTP:kr-net@telelists.com] Sent: Tuesday, May 18, 1999 12:21 AM To: kr-net digest recipients Subject: kr-net digest: May 17, 1999 KR-net users group Digest for Monday, May 17, 1999. 1. Re: Smart Level 2. Schneider Cup KR-2 3. Re: prop material 4. Mixing T-88 on wax paper 5. Re: Schneider Cup KR-2 6. Re: Schneider Cup KR-2 7. Lawsuit... 8. Re: horizontal stab 9. Re: Smart Level 10. Re: horizontal stab 11. vertical stab. 12. Re: instrument panel & trim tab 13. T-88/Wax Part 2 14. Re: instrument panel & trim tab 15. Re: T-88/Wax Part 2 16. Re: horizontal stab 17. Re: Smart Level 18. Some more progress 19. Re: More on Fuel Gauges 20. Re: horizontal stab 21. Re: Smart Level 22. Re: Smart Level ---------------------------------------------------------------------- Subject: Re: Smart Level From: "Mark Langford" Date: Mon, 17 May 1999 06:09:31 -0500 X-Message-Number: 1 Mike Taglieri wrote: >I've never understood the enthusiasm for these things. A water level >gives you absolute accuracy, limited only by the pull of gravity and the >surface tension of the fluid used, in a rather inconvenient form. From >what I've seen in catalogs, a "smart level" is a standard bubble level -- >with all the inherent inaccuracies -- connected to a laser beam that only >multiplies those inaccuracies. I'm sure they're fast to use, but for >anyone doing careful work (which I hope would be most of the people on >this list) why would you want one? Mike, Smart Levels don't use laser beams. I think that the bubble sights that come mounted to them is there only for getting you close enough to calibrate. They are electronic, somehow. I don't know how they work (maybe it's a "gravity chip") but their .1 degree accuracy is certainly close enough for any and all KR work. You're right about water levels having far more accuracy, but that's only over long distances. For example, over the 144" distance from my firewall to tail, and assuming I can discern the difference in a 1/16" in the height of the water column, I'm within .023 degree! Now, over the 30" distance from nose to trailing edge of the tip airfoil on the wing, that same 1/16" resolution only equates to .12 degrees. It's a wash at these small distances. Now if you get down to a distance like a foot or so, the Smart Level wins hands down. I don't know if you've ever spent an hour leveling up your fuselage forward/aft and side/side with a water level, but it didn't take too many of those occasions for me to pay for the Smart Tool. There's nothing wrong with the water level. It's just that it's time consuming to use, and you have a mess to clean up if you drop one end. And if you can discern the difference in water column height as small as 1/32", you've just doubled the water level's accuracy. I wanted an electronic level for several reasons, one of which is to test nose-down attitude at speed at the next Gathering, among others. It's probably a question of how much your time is worth. Lately, there's nothing more precious than my time... Mark Langford, Huntsville, Alabama mailto:langford@hiwaay.net see KR2S N56ML at http://home.hiwaay.net/~langford ---------------------------------------------------------------------- Subject: Schneider Cup KR-2 From: Steven Eberhart Date: Mon, 17 May 1999 08:59:52 -0500 (CDT) X-Message-Number: 2 I have been off the list for a while but something has come up that has really gotten me enthused again, so - I'm back. Dig out your June 1999 issue of Kitplanes and look at page 28. The official web page is at: http://www.aviogatti.it THe only problem is that it is in Italian. The Schneider cup air races are back! THis time around, the planes must be European Microlight legal, and our proposed Sport Pilots License legal. Meaning, gross weight up to 1100 lbs, stall speed of 40 MPH, and any type of engine either piston or Wankel is allowed. THe 1100 lb. gross weight is for a two passenger float plane but single place planes are allowed with a lower weight allowance. The first race is to be held in Naples or Venice, Italy in September 2002 with the second race being held in the Country of the winning team. The last Schneider Cup was won by England but the speed record is still held by the Italians at 440.075. The Piccola Schneider racers aren't going to go that fast but the winning speeds will probably be around 200 MPH. A stock width KR-2 with a purpose designed wing based on the Ashok 18% root and 15% tip laminar flow airfoils with 70% span extended lip slotted flaps should get the wing area down for a fast wing and still be able to meet the 40 MPH stall speed. Kevlar floats with internal carbon fiber reinforcement would work to keep your feet dry while floating out on the water and still keep the weight under the 1100 lb. limit. If we can get interrest stired up to support a KR entry we could start working in earnest on a carbon fiber spar wing with the new airfoils and the kevlar floats. Winning the Piccola Coppa Schneider (Small Schneider Trophy in English) with an airplane design that is over 25 years old but with state of the art wings and floats would be very neat! If there is enough interrest in fielding a KR-2 team for the 2002 air race then I will setup an open mail list (available to anyone that wants to subscribe) to support the work. Are any of you up to going fast and setting a little history? Steve Eberhart newtech@newtech.com ------------------------------------- http://www.newtech.com/nlf One test is worth a thousand expert opinions but a thousand opinions are easier to get. --plagiarized from an unknown author All information, in any of my aircraft related correspondence, is strictly food for thought and is in no way intended to imply that it is anything more than ideas requiring additional, qualified, engineering analysis. ---------------------------------------------------------------------- Subject: Re: prop material From: MARVIN MCCOY Date: Mon, 17 May 1999 19:17:17 -0700 X-Message-Number: 3 The Stones wrote: > > > > >From where is Erics book available? > Tim S. > > --- > I can't remember the price but the adress is: Eric clutton 913 Cedar Lane Tullahoma, TN 37388 Propeller Making for the Amateur ---------------- ---------------------------------------------------------------------- Subject: Mixing T-88 on wax paper From: "Rick Hubka" Date: Mon, 17 May 1999 7:28:28 X-Message-Number: 4 Just this very moment I just got a sick feeling in my stomach. 14 hours ago I just finished the assembly and T-88 epoxy of the first side of my fusalage on the big table. I used a "new " mixing tube gun from aircraft spruce (specifically designed for T-88 by WEST) for mixing and thus did not need little paper cups. Having just finished inserting wax paper under all the joints, I had several sheets of it laying all over the table. Yes... I discharged the mixed epoxy onto the wax sheets(contamination!!!). Then I didn't trust the little mixing needle tip on the gun so I further mixed the T-88 on the wax paper with a small brush. Everything went fine in glue/assembly. The epoxy started to get too thick about every 10 min's (not good for grain penetration) so I ended up mixing up about 8 batches (yes... on wax paper) to finish. Now I sit at work in front of my PC unable to work. All I can think about is my %$#@%$@ error. Q: Should I use my fusalage side as a wall hanging? or can it be trusted if it doesn't pop during the bending? ---------------------------------------------------------------------- Subject: Re: Schneider Cup KR-2 From: Steven Eberhart Date: Mon, 17 May 1999 10:50:33 -0500 (CDT) X-Message-Number: 5 KRnet'ers, Take a look at: http://www.scn.org/edu/441/2_99.html THis is the design that, Mike Friend, Chief Engineer, Future Platforms, Boeing Commercial Airplanes, is working on for his Schneider Cup entry. Surely we can put a KR-2 in this race. We already have the airfoils for the new wing. Kevlar floats can't be that hard to come up with. Just think of the publicity the KR-2 would get. Yes, I could be talked into making up molds for skins for the new wing and for the floats. The wing would be suitable for use on any KR and would be a single taper with real flaps that would get the stall down to the required 40 MPH. The wing would also be optimized for faster speeds, i.e. smaller than the current wing but still have the low stall speed. I think part of the problem with the nose low high speed attitude is due to too much lift being available at high speed. The excessive wing area is needed for the low speed range. The very effective flaps would reduce the wing area necessary for low stall speeds while providing the right amount of lift at higher speeds. Just trying to fan the flames of competition a little. Steve Eberhart newtech@newtech.com ------------------------------------- http://www.newtech.com/nlf One test is worth a thousand expert opinions but a thousand opinions are easier to get. --plagiarized from an unknown author All information, in any of my aircraft related correspondence, is strictly food for thought and is in no way intended to imply that it is anything more than ideas requiring additional, qualified, engineering analysis. ---------------------------------------------------------------------- Subject: Re: Schneider Cup KR-2 From: Steven Eberhart Date: Mon, 17 May 1999 11:32:21 -0500 (CDT) X-Message-Number: 6 An English language site for the Schneider Cup can be found at: http://www.ulmeurope.com/en/z90058.html I don't have the rules yet in English but that is supposed to be available shortly on hte web. Until then, are there any Italian KRnet members that could help us out? The rules are at: http://www.aviogatti.it/coppa.htm Steve Eberhart newtech@newtech.com ------------------------------------- http://www.newtech.com/nlf One test is worth a thousand expert opinions but a thousand opinions are easier to get. --plagiarized from an unknown author All information, in any of my aircraft related correspondence, is strictly food for thought and is in no way intended to imply that it is anything more than ideas requiring additional, qualified, engineering analysis. ---------------------------------------------------------------------- Subject: Lawsuit... From: BSHADR@aol.com Date: Mon, 17 May 1999 12:14:56 EDT X-Message-Number: 7 KRNetters: A sobering post worth repeating. We all have a duty to understand the risks inherent with our pursuits and not seek to blame others for everything that goes wrong. I do not know the merits of either side in this case, but I do know this will be a loss to the aviation community. I have a foggy recollection of prior similar legal actions that have chased most of the spam-can makers out of our end of the aviation world. Please build carefully, fly safely and inform your family of the risks you are assuming in aviation. Randy "Soapbox" Stein Soviet Monica, CA Flamesto: BSHADR@aol.com ~~~~~~~~~~~~~~~~ >TEAM May 4, 1999 >To: All TEAM Dealers >From: Wayne Isom >Subject: IMPORTANT NOTICE We need to inform you of very recent developments hear at TEAM. To explain the situation we find ourselves in, it is necessary to go back 3 years, when a man in Florida built an AirBike and then crashed it. He filed a lawsuit, claiming we supplied defective materials. Although he had a very weak case, it was still necessary to spend big dollars and much effort in Florida to defend ourselves. Last year we met in a Florida court and the decision was in our favor. They found no indication of defective material, that caused the pilot loss of control. The financial expenditure to TEAM was far beyond our expectations and in fact, we are still in debt to our attorneys for those costs. Now we have been informed he has re-filed this case, and from all indications is prepared to do all this again in a bigger way. Our lawyers have advised us they feel we can still win again; however, the financial cost this time will be much greater. This is a "no win" situation for TEAM as we lose big bucks either way. Unfortunately, the U.S. judicial system does not protect, or provide a method for a small business to defend itself against repeated assaults by anyone, even though this business has not been found guilty of anything, without spending vast sums of money. Our options are few. Financially, we cannot afford to win, and even when wewin, this may not stop another legal attack. If we do not defend ourselves, and the case goes to trial, they will automatically win and can take everything. It appears our only option is to immediately cease as an existing business, by filing for bankruptcy, since they are literally putting us in this financial condition. It is with extreme regret that we find it necessary to do this to our worldwide network of TEAM Dealers, and their customers. Hopefully, we may be able to inform you of other sources that will be able to supply you and your existing customers with material to finish or keep existing aircraft flying. With deepest regrets, TENNESSEE ENGINEERING & MFG., INC. by: Wayne Isom, President P.S. It is a sad situation when one man can spoil so much for so many. ---------------------------------------------------------------------- Subject: Re: horizontal stab From: Warron Gray Date: Mon, 17 May 1999 12:48:16 -0400 X-Message-Number: 8 Dean Collette wrote: > From: Warron Gray > > >. . . They were sick and tired of that problem until they solved it for > > under $10.00 bucks Very simple, the problem is the elevator if it is not balanced then it droops down. You can balance the surface or just add a simple spring to the pushrod or cable using an adele clamp and a good door spring . mount one end of the spring to a bulkhead or in my case the spar and adjust the tension till the elevator is level. The differant airspeeds causes the elevator to droop at slower speeds and you adjust the trim then speed picks up and the elevator is normally pushed up by the air pressure changing the trim again , so you are always chasing the corresct setting on the trim . Ballancing the elevator , which adds more weight or adding the spring to eliminate the droop cures the stability problems as verified by 2 flying kr's with over 700 hours between them. Good luck to you all, Warron ---------------------------------------------------------------------- Subject: Re: Smart Level From: Warron Gray Date: Mon, 17 May 1999 12:55:25 -0400 X-Message-Number: 9 Michael Taglieri wrote: > I've never understood the enthusiasm for these things. A water level > gives you absolute accuracy, limited only by the pull of gravity and the Used a smartlevel to build my "S" everything with in 1 /10 degree and there is no laser in my smartlevel but it extremely accurate, much more than a bubble level. A water or liquid level is fine especially for washout and dihedral setups but i found the smart level much esier to setup and use and read Warron ---------------------------------------------------------------------- Subject: Re: horizontal stab From: "Mark Langford" Date: Mon, 17 May 1999 13:20:02 -0500 X-Message-Number: 10 Warron Gray wrote: >Very simple, the problem is the elevator if it is not balanced then it droops >down. You can balance the surface or just add a simple spring to the pushrod >or cable using an adele clamp and a good door spring . Sorry but that's not it. There are lots of KRs out there with fully balanced elevators, including Neil Bingham's. He's the one that wrote the first definitive work on how pitch sensitive they are, and how the tail needed to be longer or hs larger, as well as the CG range ammended (don't use the last 2"). "Pitch sensitivity" doesn't refer to trim sensitivity (at least not the way we use it here). It's the lack of stability or restoring force when the plane's pitch is perturbed from the neutral state, especially under aft CG conditions. Mark Langford, Huntsville, Alabama mailto:langford@hiwaay.net see KR2S N56ML at http://home.hiwaay.net/~langford ---------------------------------------------------------------------- Subject: vertical stab. From: "Bob Whisenant" Date: Mon, 17 May 1999 12:3:28 X-Message-Number: 11 If the vertical stab. is off set for a c75 and i want to change to a vw.Can the rotation of the vw be changed?It was like this when i got it.allso i am rebuilding part of the center wing section . The main center spar was damaged when landing gear folded on landing.The rear spar is fine . To keep from damaging rear spar .Can the center wing sec.be cut forward of the rear spar and new main spar replaced foam ribs added foam sanded to shaped and glass laid over rear spar paint sanded off glass to make a safe repair. ---------------------------------------------------------------------- Subject: Re: instrument panel & trim tab From: Jim Faughn Date: Mon, 17 May 1999 18:42:06 -0500 X-Message-Number: 12 I built my trim tab the same way as you build the ailerons only smaller. I felt the way the plans showed it didn't provide the best stength. No analysis, just gut feel. So I put a very small spruce spar in the elevator and the trim tab and attached them with a hinge. Like I said, the same way as you would the ailerons. I then connected nyrod from a horn on the trim tab to the Mac servo. I have found it to be very reliable and does exactly what I want it to do. -- Jim Faughn N8931JF St. Louis, MO (314) 652-7659 or Cell (314) 346-4038 > Subject: Re: instrument panel & trim tab > From: RFG842@aol.com > Date: Sun, 16 May 1999 10:09:49 EDT > X-Message-Number: 4 > > > I'm trying to solve the trim tab problem myself. I'm sure someone has he > answer. > > Bob > > ---------------------------------------------------------------------- ---------------------------------------------------------------------- Subject: T-88/Wax Part 2 From: "Rick Hubka" Date: Mon, 17 May 1999 18:09:10 -0600 X-Message-Number: 13 This is a multi-part message in MIME format. ------=_NextPart_000_001D_01BEA090.5D081C60 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Well I popped the fusalage frame off the bench 24hrs after T-88 was = applied. She's as solid as a rock. I checked the thrown out wax sheets = and pulled off the dried epoxy. The epoxy pulled off with no wax = residue and the wax sheets appeared to have all wax intact as if new. = So far so good. Rod Kelso from Denver advised me to (before I wall mount the mistake) = make test pieces with more T-88 mixed and wax sheets and testing how the = joints break under pressure ( the wood must break apart and not the T-88 = joint). I've read this testing stuff before but am (like most people) = very bad at following directions. I've learned lesson # 1... I wonder what lesson # 2 will be... or #3... = or #10... Rick Hubka rick@hubka.com Calgary, Alberta Canada ------=_NextPart_000_001D_01BEA090.5D081C60 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Well I popped the fusalage frame off the bench 24hrs = after=20 T-88 was applied.  She's as solid as a rock.  I checked the = thrown out=20 wax sheets and pulled off the dried epoxy.  The epoxy pulled off = with no=20 wax residue and the wax sheets appeared to have all wax intact as if = new. =20 So far so good.
 
Rod Kelso from Denver advised me to (before I wall = mount the=20 mistake) make test pieces with more T-88 mixed and wax sheets and = testing how=20 the joints break under pressure ( the wood must break apart and not the = T-88=20 joint).  I've read this testing stuff before but am (like most = people) very=20 bad at following directions.
 
I've learned lesson # 1...  I wonder = what=20 lesson # 2 will be... or #3... or #10...
 
Rick Hubka
rick@hubka.com
Calgary,=20 Alberta    Canada
------=_NextPart_000_001D_01BEA090.5D081C60-- ---------------------------------------------------------------------- Subject: Re: instrument panel & trim tab From: "Paul W. O'Reilly" Date: Mon, 17 May 1999 20:10:11 -0400 X-Message-Number: 14 I made my trim tab to plans but actuate it with an SkilTwist electric screwdriver. This is the kind that has a built in battery and is essentially a handle with a dual direction head. I got mine at a yard sa= le because the battery(nicad) was shot. I cut the thing in half to eliminate= the battery and bought some cheap hardware which inserts into the hex hea= d of the screwdriver and actuates the trim tab. Power is from the ac batte= ry stepped down to 6 v. Paul mostly done only 50% to go Beechman@Compuserve.com ---------------------------------------------------------------------- Subject: Re: T-88/Wax Part 2 From: Mike Mims Date: Mon, 17 May 1999 18:28:18 -0700 X-Message-Number: 15 > Rick Hubka wrote: > > Well I popped the fusalage frame off the bench 24hrs after T-88 was > applied. She's as solid as a rock. >>> I think you will find as long as you didn't get any thermo cure (heat) the wax pretty much stays on the paper (or in the cup) unless you scrape really hard. I had the same feeling you did about the T88 gun mixing the epoxy sufficiently so I made test pieces with T88 mixed via the gun and with a stick and the gun mixed epoxy was just fine. Pretty much my entire airplane is glued together with "gun mixed" T88. -- zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz Micheal Mims Ailerons almost done! http://www.geocities.com/CapeCanaveral/Hangar/4136/ Aliso Viejo CA Give Blood, Play Hockey! ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ ---------------------------------------------------------------------- Subject: Re: horizontal stab From: Mike Mims Date: Mon, 17 May 1999 18:31:50 -0700 X-Message-Number: 16 Warron Gray wrote: > > > Very simple, the problem is the elevator if it is not balanced then it droops down. You can balance the surface or just add a simple spring to the pushrod or cable using an adele clamp and a good door spring .>>>>> Uh,.......No! Uh,.....not just No, but WAY NO! Buuuuuuuuuzzzzzzzz, sorry try again. Game over, please insert another quarter. -- zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz Micheal Mims Ailerons almost done! http://www.geocities.com/CapeCanaveral/Hangar/4136/ Aliso Viejo CA Give Blood, Play Hockey! ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ ---------------------------------------------------------------------- Subject: Re: Smart Level From: HAshraf@aol.com Date: Mon, 17 May 1999 22:20:13 EDT X-Message-Number: 17 In a message dated 99-05-17 07:10:47 EDT, you write: << tting you close enough to calibrate. They are electronic, somehow. I don't know how they work (maybe it's a "gravity chip") but their .1 degree accuracy is certainly close enough for any and all KR work >> Mark, Most electronic levels employ a Silicon accelerometer (which are accurate to about 3-5 milli g's (commercial grade). Horizontal they measure exactly 1 g. when they are tilted they the signal is less, depending upon the tilt. I have some literature on them. If you want it let me know I'll send you a copy. Your idea of 'gravity chip' was conceptually correct. Accuracy 3 mg would be be about 3/1000 radians which equates to 3/1000*60 = 0.18 degrees. For very accurate measurements, a set of three orthognal accelerometers is used. I use a machinest level which is accurate to 0.005in/ft which I bought from, you guessed it, McMaster Carr. Haris making slow progress ---------------------------------------------------------------------- Subject: Some more progress From: HAshraf@aol.com Date: Mon, 17 May 1999 23:19:45 EDT X-Message-Number: 18 Well folks, I did make some good progress over the weekend. I was able to add all remaining gussets and few other pieces to the boat so now irt is ready to accpet the spars elevator and rudder. Some work, of course, still needs to be done on it. I haven't yet skinned the aft lower side for accessbility purposes. An engine mounting shear brace is still not on (per plans). The fuselage Vee braces also will go at the end to account for any misalignment of the fin. The way things stand now is that the fin is within 1/8-1/6 from vertical. Good enough for KR, I guess. All the rear spar frames are done and shear webs scarfed. The webs should go on in the next week or so. Then I will start working on forward spars. The biggest challange is to taper the outer spars but Mike Mims has offered his help. I was finally able to attach all five hinges to the elevator spar. It took a lot of work an still I may have to start all over again if I am not satisfied. I would not want any friction in any of my control systems. I'll keep you guys posted. Haris ---------------------------------------------------------------------- Subject: Re: More on Fuel Gauges From: jscott.pilot@juno.com Date: Mon, 17 May 1999 21:24:13 -0700 X-Message-Number: 19 On Sun, 16 May 1999 20:37:15 -0500 Kerry Miller writes: >I got a note today from a guy with a Lake Amphibian, he said they come from >the factory set up like I described for my wing tanks and neither of the >aux tanks has a gauge, only the main tank. Mike (or anybody else), did the >inspector mention a reference in the FARs which required the gauges? I've >heard before that you need a gauge for all tanks, but I keep getting >conflicting stories. I could save some weight and time by leaving them >off, but sure would hate to get a squawk from the inspector about it. > >Kerry Miller >Full owner of 1/2 of a KR-2 Kerry, The Lake may have got off the "hook" because of the date of manufacture and the rules that applied then vs now. Unfortunately, this is one of those things that is subject to local interpretation. You can either wait for the inspection and see if you fail, or you can call your local FSDO office and ask for an answer. If the local FSDO says you don't have to have them, then most likely the inspector will go along if you tell him you checked with the FSDO office. If they say you're gonna have to have gauges, then you have your answer. Call the FSDO office and ask for the guys that deal with homebuilts. From what I've seen of the ones in our area, their on your side, but want you to build a safe plane. Jeff Scott - Los Alamos, NM mailto:jscott.pilot@juno.com See N1213w construction and first flight at http://www.thuntek.net/~jeb/krjeff.htm ___________________________________________________________________ You don't need to buy Internet access to use free Internet e-mail. Get completely free e-mail from Juno at http://www.juno.com/getjuno.html or call Juno at (800) 654-JUNO [654-5866] ---------------------------------------------------------------------- Subject: Re: horizontal stab From: HAshraf@aol.com Date: Mon, 17 May 1999 23:20:07 EDT X-Message-Number: 20 In a message dated 99-05-17 13:29:46 EDT, you write: << Very simple, the problem is the elevator if it is not balanced then it droops down. You can balance the surface or just add a simple spring to the pushrod or cable using an adele clamp and a good door spring . mount one end of the spring to a bulkhead or in my case the spar and adjust the tension till the elevator is level. The differant airspeeds causes the elevator to droop at slower speeds and you adjust the trim then speed picks up and the elevator is normally pushed up by the air pressure changing the trim again , so you are always chasing the corresct setting on the trim . Ballancing the elevator , which adds more weight or adding the spring to eliminate the droop cures the stability problems as verified by 2 flying kr's with over 700 hours between them. Good luck to you all, Warron >> All this is not adding up. What you have described here seems like some sort of mechanical automatic control system. I have always thought that KR is pitch sensitive because it small tail and a small tail moment arm. Lack of static margin (c.g too aft) is also as a reason (probably largest culprit in the S Model). I have always maintained that by increasing the lever arm, increasing the tail (Stab only, elevator is big enough) and betteg cg location will solve the problem. All the literature I have read points to that and thats what I plan to do with my plane. Than been said, I should add that I am no means an expert in aircraft stability. There is this new 'secret' elevator (Dr. Dean's) which is designed by an aerodynamist that is supposed to solve the pitch sensitivity problem. I must admit that I have burned a lot of midnight oil and electron, and have not been able to come up with an explanation. One thing to remember that no matter what methods are used to reduce pitch sensitivity (which is a pilot issue after all) once an airplane enters a bad stall or a spin then its the static margin and large and effective rudder that count. Any spring systems, mass balances or anything else is not going to help. ---------------------------------------------------------------------- Subject: Re: Smart Level From: Michael Taglieri Date: Tue, 18 May 1999 00:45:15 EDT X-Message-Number: 21 >> I've never understood the enthusiasm for these things. A water level >> gives you absolute accuracy, limited only by the pull of gravity and the > >Used a smartlevel to build my "S" everything with in 1 /10 degree and there >is no laser in my smartlevel but it extremely accurate, much more than a >bubble level. A water or liquid level is fine especially for washout and >dihedral setups but i found the smart level much esier to setup and use and >read Warron I guess I was confusing the SmartLevel with those laser-beam levels that I see being sold everywhere, which seem virtually useless. I assume then that a SmartLevel is a level with a digital readout rather than a bubble? Mike Taglieri ___________________________________________________________________ You don't need to buy Internet access to use free Internet e-mail. Get completely free e-mail from Juno at http://www.juno.com/getjuno.html or call Juno at (800) 654-JUNO [654-5866] ---------------------------------------------------------------------- Subject: Re: Smart Level From: Mike Mims Date: Mon, 17 May 1999 22:08:00 -0700 X-Message-Number: 22 Michael Taglieri wrote: > > I assume then that a SmartLevel is a level with a digital readout rather than a bubble? > You got it. I borrowed one to set my wings and its pretty darn cool! -- zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz Micheal Mims Ailerons almost done! http://www.geocities.com/CapeCanaveral/Hangar/4136/ Aliso Viejo CA Give Blood, Play Hockey! ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ --- END OF DIGEST --- You are currently subscribed to kr-net as: johnbou@timberline.com To unsubscribe send a blank email to leave-kr-net-17800J@telelists.com