From: krnet-bounces@mylist.net To: John Bouyea Subject: KRnet Digest, Vol 346, Issue 44 Date: 7/23/2004 8:59:50 PM Send KRnet mailing list submissions to krnet@mylist.net To subscribe or unsubscribe via the World Wide Web, visit http://mylist.net/listinfo/krnet or, via email, send a message with subject or body 'help' to krnet-request@mylist.net You can reach the person managing the list at krnet-owner@mylist.net When replying, please edit your Subject line so it is more specific than "Re: Contents of KRnet digest..." Today's Topics: 1. Re: West Coast Gathering (Jim Morehead) 2. Re: Foam vs. Foam (Ron Eason) 3. Revmaster 2100D (Oscar Zuniga) 4. Re: West Coast Gathering (Dennis Mingear) 5. Fun Friday (Dana Overall) 6. corvair and Oshkosh (rparker) 7. Re: Foam vs. Foam (Barry Kruyssen) 8. RE: 5in tire pressure (Brian Kraut) 9. Yipppeee! (Brian Kraut) ---------------------------------------------------------------------- Message: 1 Date: Fri, 23 Jul 2004 08:13:34 -0700 From: Jim Morehead Subject: Re: KR> West Coast Gathering To: KRnet Message-ID: Content-Type: text/plain; charset="US-ASCII" Netters; I also would be interested in attending a gathering on the West Coast. Jim Morehead, Cameron Park, CA on 7/22/04 8:03 PM, John Esch at jfesch@earthlink.net wrote: > All > How many west coasters on the KR list? > Curious what the interest would be for a West Coast gathering in the > future? > > John Esch > KR-2SSW > Independence State Airport, OR (7S5) > _______________________________________ > to UNsubscribe from KRnet, send a message to KRnet-leave@mylist.net > please see other KRnet info at http://www.krnet.org/info.html ------------------------------ Message: 2 Date: Fri, 23 Jul 2004 10:37:59 -0500 From: "Ron Eason" Subject: Re: KR> Foam vs. Foam To: "KRnet" Message-ID: <008f01c470cb$08cad8c0$6601a8c0@CADENGINEERING> Content-Type: text/plain; charset="iso-8859-1" Density vs strength is the gauging criteria for choosing physical properties and PolyU is stronger when considering this. Temperature effects is another point of consideration and PolyU is better in this respect also. KRron ----- Original Message ----- From: "Stephen Jacobs" To: "'KRnet'" Sent: Friday, July 23, 2004 7:33 AM Subject: RE: KR> Foam vs. Foam I understand the physical (chemical) differences between Styrofoam (polystyrene?) and Polyurethane. I have used Styrofoam in various densities from 2 to 6 lb/cub ft - the higher density stuff appears to be mechanically as strong (or stronger) than PolyU when used as a composite core material - is this correct? This may be a naïve question as I have not seen (touched) the stuff you call Lastofoam (Divinicel?). Maybe this is a mechanically stronger polyU, but the stuff locally available is very fragile - I can poke my finger all the way into it without much effort and the surface readily crumbles almost to a dust when rubbed - not an ideal surface to glue anything to. My wife uses it for flower arrangements. Styrofoam has its own draw backs in that Vinyl Ester resins (and most solvents /avgas) will attack it. I need to appreciate the structural qualities /suitability for use in the KR type construction. In a perfect world (and the US) a large variety of core materials can be purchased without any trouble - in fact, someone will deliver whatever you desire to your front door. This is not the case for me in Africa. I can however source good quality (not re-cycled) white Styrofoam in many densities from South Africa. The stuff is easy to "slice" into sheets of any thickness with a hot wire. It does not sand as well as polyU, but the higher density stuff is not too bad - it can be done. I am looking to do Mark L style sandwich wing skins - glass on both sides of the skin core. The logistics of shaping the material aside - can Styrofoam be used to the same good effect? The theory says that the strength of a composite sandwich increases almost exponentially with thickness. I cannot see that polyU will outperform Styrofoam in compressive or tensile strength - maybe the shear capability is the issue? I will appreciate any informed advice Regards Steve J _______________________________________ to UNsubscribe from KRnet, send a message to KRnet-leave@mylist.net please see other KRnet info at http://www.krnet.org/info.html ------------------------------ Message: 3 Date: Fri, 23 Jul 2004 13:17:32 -0500 From: "Oscar Zuniga" Subject: KR> Revmaster 2100D To: krnet@mylist.net Message-ID: Content-Type: text/plain; format=flowed Folks Anyone interested in a zero-time Revmaster 2100D can contact aquanaut@indy.rr.com (David Esslinger), who has changed his mind about trying to use one on a Pietenpol. He's now looking for an A65 if anyone has a lead on one. Oscar Zuniga San Antonio, TX mailto: taildrags@hotmail.com website at http://www.flysquirrel.net ------------------------------ Message: 4 Date: Fri, 23 Jul 2004 12:08:16 -0700 (PDT) From: Dennis Mingear Subject: Re: KR> West Coast Gathering To: KRnet Message-ID: <20040723190816.32346.qmail@web51406.mail.yahoo.com> Content-Type: text/plain; charset=us-ascii I would be interested. Denny ... Pittsburg, Ca. Jim Morehead wrote: Netters; I also would be interested in attending a gathering on the West Coast. Jim Morehead, Cameron Park, CA on 7/22/04 8:03 PM, John Esch at jfesch@earthlink.net wrote: > All > How many west coasters on the KR list? > Curious what the interest would be for a West Coast gathering in the > future? > > John Esch > KR-2SSW > Independence State Airport, OR (7S5) > _______________________________________ > to UNsubscribe from KRnet, send a message to KRnet-leave@mylist.net > please see other KRnet info at http://www.krnet.org/info.html _______________________________________ to UNsubscribe from KRnet, send a message to KRnet-leave@mylist.net please see other KRnet info at http://www.krnet.org/info.html --------------------------------- Do you Yahoo!? New and Improved Yahoo! Mail - Send 10MB messages! ------------------------------ Message: 5 Date: Fri, 23 Jul 2004 15:43:06 -0400 From: "Dana Overall" Subject: KR> Fun Friday To: krnet@mylist.net Message-ID: Content-Type: text/plain; format=flowed OK, since it's Friday and I haven't spoke in the alum tongue for a while here goes:-) http://rvflying.tripod.com/carbonpanel.jpg Well, I guess it's not alum but composite. The panel was laid up by Steve Eberhart. If you don't know Steve, he and I are heading that way together and will be camping. Steve, along with Mark, was one of the major forces behind the new wing. He was also the manufacturer of the airfoil that went into the wind tunnel. If anyone has seen this wing portion you will understand just how good my panel looks. This panel is 4 layers and carbon from the bottom of the Garmin 327 transponder and 10 layers south of the 327. My throttle, mixture etc. will be below the 327, thus the extra support. A lip is also built into the panel on the backside below the 327 to give it a good attachment point plus add rigidity. The Dynon is wired to the 327 providing gray code, thus no need for an encoder. Two holes are cut into the alum panel on the backside to the left of the 430 for a Garmin 106A indicator head and a hole for the Trio Avionics EZ Pilot Autopilot. The red lens on the top is the Grand Rapids EIS4000 engine moniter idiot light. The PS Engineering stereo intercom is below the Monroy 200 Air Traffic Detector. The detector is wired into the intercom so the female can "talk" to me when traffic is present and I have the autopilot on watching a DVD on the 7" LCD screen mounted on the right side:-). If I don't have everything permanently wired in I'll pull it out and bring it to the gathering along with my completed gold powder coated 13B rotary. Back to work, it sure is fun when you can start turning things on!! Dana Overall 1999 & 2000 National KR Gathering host Richmond, KY i39 RV-7 slider, Imron black, "Black Magic" Finish kit 13B Rotary. Hangar flying my Dynon. http://rvflying.tripod.com/aero1.jpg http://rvflying.tripod.com/aero3.jpg http://rvflying.tripod.com/blackrudder.jpg do not archive ------------------------------ Message: 6 Date: Fri, 23 Jul 2004 17:38:57 -0500 From: "rparker" Subject: KR> corvair and Oshkosh To: krnet@mylist.net Message-ID: <20040723223857.11483.qmail@server278.com> Content-Type: text/plain; charset="iso-8859-1" Couple of unrelated questions. 1. Has anyone figured out the maximum angle forwards and backwards that a corvair engine with stock oil pan can be tipped before starving the fuel pump pickup? 2. Is the KR crowd oshkosh schedule posted anywhere? I know there has probably been discussion but I missed it. I'm flying to Illinois on Monday and havent yet decided if I'm going to hang around and go up for opening day. If there is beer and brats available Monday or Tuesday night I might swing up there. Rich Parker KR-2S Peterborough, NH rparker@wwhotspots.com ------------------------------ Message: 7 Date: Sat, 24 Jul 2004 08:37:36 +1000 From: "Barry Kruyssen" Subject: Re: KR> Foam vs. Foam To: , "KRnet" Message-ID: <00fe01c47105$a9222960$2700a8c0@T1W419b> Content-Type: text/plain; charset="iso-8859-1" I've used polystyrene, divinycell and the "green" foam for building boats. Polystyrene we found hard to work with and that fuel dissolved it (show me a boat that doesn't get fuel in it :-) We then changed to vacuum moulding using divinycell and carbon fibre. 2oz woven fibreglass at 45 degrees to 4oz carbon fibre outside and 3/4oz carbon fibre inside on 1/4in divinycell is very tough and rigid (the outside 2oz fibreglass for sanding and finishing so the carbon fibre is not damaged during finishing). Now when I got my KR2 I had to modify the cowling so out came the divinycell (20 years old now). What a disaster. As I was not using a mould I had trouble getting the divinycell to the shape I wanted and sanding it was impossible. So down to the local branch of Fibreglass International to see what to use now. Green foam was the answer, I got a sheet and re-shaped my cowling, very easy to sand and shape but very soft and easy to dent. Once finished I had a layer of 6oz on both sides and it is way softer and more flexible than that made with divinycell. The discarded divinycell left on the ground can be walked on and have tools dropped on and be generally abused without denting or separating, but the green foam cut-out that was left over virtually fell apart when I gave it a little twist. All that said my cowling is way strong enough to guide the air around my engine and firewall, which is all it has to do, it is NOT structural. Most of the fibreglassing on a KR is non-structural, only to cover nicely shaped foam. We are after a well bonded, lite and rigid surface. Having bought a 99% completed KR2 I have missed the joy of building it. And after reading of this groups adventures of building, I am envious. I will build eventually but that will have to be after the kids finish college, 8 years or more, by then I wonder where the KR2 design will have evolved to? I can hardly wait. :-) I really want to investigate some of the new products (ie. carbon rods) and methods for building. The ramblings of a frustrated builder (I already have a 43ft X 60ft (13m X 18m) workshop. Barry Kruyssen Cairns, Australia RAA 19-3873 kr2@BigPond.com http://users.tpg.com.au/barryk/KR2.htm ----- Original Message ----- From: Larry A Capps To: 'KRnet' Sent: Friday, July 23, 2004 10:46 PM Subject: KR> Foam vs. Foam I actually prefer Divinycell over Last-A-Foam for most applications. PVC Foam = Divinycell (rigid PVC) Clark Foam = Last-A-Foam (unicellular polyurethane) Larry A Capps Naperville, IL "You're just jealous because the voices don't talk to you." -----Original Message----- This may be a naïve question as I have not seen (touched) the stuff you call Lastofoam (Divinicel?). Maybe this is a mechanically stronger polyU, but the stuff locally available is very fragile - I can poke my finger all the way into it without much effort and the surface readily crumbles almost to a dust when rubbed - not an ideal surface to glue anything to. My wife uses it for flower arrangements. Styrofoam has its own draw backs in that Vinyl Ester resins (and most solvents /avgas) will attack it. _______________________________________ to UNsubscribe from KRnet, send a message to KRnet-leave@mylist.net please see other KRnet info at http://www.krnet.org/info.html ------------------------------ Message: 8 Date: Fri, 23 Jul 2004 22:14:43 -0400 From: "Brian Kraut" Subject: RE: KR> 5in tire pressure To: "KRnet" Message-ID: Content-Type: text/plain; charset="us-ascii" I used 28 and it worked fine. If you start to get over 30 it gets real bouncy on landing. Brian Kraut Engineering Alternatives, Inc. www.engalt.com -----Original Message----- From: krnet-bounces@mylist.net [mailto:krnet-bounces@mylist.net]On Behalf Of Kenneth L Wiltrout Sent: Thursday, July 22, 2004 8:12 PM To: krnet@mylist.net Subject: Re: KR> 5in tire pressure I run 25lbs and don't have any tire sag, lower tire press helps when the landing is less than perfect. also rollout is shortened a little. On Thu, 22 Jul 2004 15:45:56 -0700 larry severson writes: > What tire pressure should I put in the 5in main wheels? I have heard > > everything from 25 to 50 PSI. > > Larry Severson > Fountain Valley, CA 92708 > (714) 968-9852 > larry2@socal.rr.com > > > _______________________________________ > to UNsubscribe from KRnet, send a message to KRnet-leave@mylist.net > please see other KRnet info at http://www.krnet.org/info.html > > ________________________________________________________________ The best thing to hit the Internet in years - Juno SpeedBand! Surf the Web up to FIVE TIMES FASTER! Only $14.95/ month - visit www.juno.com to sign up today! _______________________________________ to UNsubscribe from KRnet, send a message to KRnet-leave@mylist.net please see other KRnet info at http://www.krnet.org/info.html ------------------------------ Message: 9 Date: Fri, 23 Jul 2004 22:46:57 -0400 From: "Brian Kraut" Subject: KR> Yipppeee! To: "KRnet" Message-ID: Content-Type: text/plain; charset="us-ascii" Just did my first three glider solos yesterday! Not quite as much fun as the KR and not very practical for going places, but it is a heck of a lot of fun and cheap flight time. Also pretty good emergency training when the instructor pulls the release handle at 200' altitude over the trees past the end of the runway and yells "rope break" and you have to do an immediate 45 degree bank 180 and land downwind. Not something I would practice in the KR! Hmmm, I have already extended the center section wing spars. I could extend the outboard wings, move the seat forward a few feet, knock out the firewall and just glass on a round nose, and put on a tow hook. KR-2SG for fun and take the 172 when I need to go somewhere? Seriously though, any of you other glider types out there know of any homebuilt gliders with the same construction method as a KR? I would think you could build one dirt cheap and prety quick. The club gliders rent for only six bucks a flight, but they don't let you do cross countries or aerobatics in them. Not really interrested in a motor glider. I have one and a half powered planes already. Brian Kraut Engineering Alternatives, Inc. www.engalt.com ------------------------------ _______________________________________________ See KRnet list details at http://www.krnet.org/instructions.html End of KRnet Digest, Vol 346, Issue 44 ************************************** ================================== ABC Amber Outlook Converter v4.20 Trial version ==================================