From: KR-net users group digest[SMTP:kr-net@telelists.com] Sent: Friday, September 10, 1999 12:53 AM To: kr-net digest recipients Subject: kr-net digest: September 09, 1999 KR-net users group Digest for Thursday, September 09, 1999. 1. Hand actuated brakes 2. Re: Gathering pictures 3. Re: KR Gathering 4. AeroPoxy and post-cure (long) 5. Addition to KR2-S page 6. Gathering awards 7. Re: KR Gathering 8. Re: Hand actuated brakes ---------------------------------------------------------------------- Subject: Hand actuated brakes From: "John Weikel" Date: Thu, 9 Sep 1999 05:47:38 -0500 X-Message-Number: 1 In looking at the various VW magazines, I came across a hand actuated brake device that allows differential braking. Looks like a dual master cylinder with two hand levers. Would this be usable for a centrally located hand brake reachable from both seats? $90 or so is the listed price.... Any opinions? John W ---------------------------------------------------------------------- Subject: Re: Gathering pictures From: "Mark Langford" Date: Thu, 9 Sep 1999 06:26:34 -0500 X-Message-Number: 2 David Mullins wrote: > I have taken air to air, air to ground, underwater, Awards ceremonies, > weddings, school yearbooks, etc, etc. I will be attending the gathering > with my equipment both film based and Digital. I would be happy to take > photos for the group. You just got yourself a job! Mark Langford, Huntsville, Alabama mailto:langford@hiwaay.net see KR2S N56ML at http://home.hiwaay.net/~langford ---------------------------------------------------------------------- Subject: Re: KR Gathering From: "Richard Parker" Date: Thu, 09 Sep 1999 05:31:19 PDT X-Message-Number: 3 Dana, this question has probably been asked a few time but do you haven an estimates on how long it takes to drive from Nashville? also have you posted a schedule of events? Rich Parker >From: KR2616TJ@aol.com >Reply-To: "KR-net users group" >To: "KR-net users group" >Subject: [kr-net] KR Gathering MOA >Date: Wed, 8 Sep 1999 13:35:01 EDT > >In a message dated 9/8/99 12:54:51 PM Eastern Daylight Time, >KRBLUCH@aol.com >writes: > ><< Question: Anybody have any pertinent info about the Campbell MOA at >lake > Barkley. > Dave Blucher >> > >There is a restricted area just south of the Lake Barkley airport. >EagleGator has drawn up a pilot briefing covering just that area. When I >get >there on Weds., I will be contacting the appropriate persons to find out >any >times of operations, if any for the weekend. As I recall there is a small >prohibited area. The area west and north of the airport will make for great >flying over the lake area. > >Another question, what awards do we want to have (i.e., what awards were >given out last year). Got to get that to the trophy guy this week. > >Remember, BRING SHADE AWNINGS. > >Dana Overall >1999 KR Gathering host >Richmond, KY >mailto:kr2616tj@aol.com >http://www.geocities.com/CapeCanaveral/Hangar/7085/ > >--- >You are currently subscribed to kr-net as: richontheroad@hotmail.com >To unsubscribe send a blank email to leave-kr-net-17800J@telelists.com > ______________________________________________________ Get Your Private, Free Email at http://www.hotmail.com ---------------------------------------------------------------------- Subject: AeroPoxy and post-cure (long) From: "Oscar Zuniga" Date: Thu, 09 Sep 1999 06:05:40 PDT X-Message-Number: 4 Hello, netters If you have no interest in epoxy post-curing, hit your 'delete' button now! After reading the article in last month's Sport Aviation on post-curing epoxy resins, I decided to find out what I could about AeroPoxy, which is what I'm using. The tech data for several epoxies is given in the Aircraft Spruce catalog and others as well, but nothing on AeroPoxy. So I called the factory tech rep to get the low-down on it. The article in SA talks about the Tg, or temperature at which the resin matrix goes from glassy-hard to soft. It is dependent on the characteristics of the resin and also on the temperature at which you cured it. Some epoxies will have a very high Tg no matter what temperature you cure them at, while others need a post-cure to develop full catalog characteristics. The basic rule given in the article was to figure that Tg is going to be about 40 deg. F higher than the temp at which you cured the resin at. I have made most of my layups at between 75 and 85 deg. F so far... which I'll call an average of 80F for argument's sake. So the cautious Tg would be about 120F... which is no problem to achieve with the plane parked out in the summer sun with no cover. So structural bonds and layups made with my epoxy can possibly soften, sag, or stretch just by having the plane sitting in the sun. The article goes on to mention that there are other factors, such as the critical temps for the other materials in the structure. The one material mentioned was polystyrene foam, which I am using. It starts to swell at about 165F, so that's why you sometimes see bumps, humps, puffs, sags, etc. in what used to be perfectly smooth finished surfaces... if you've used polystyrene. I don't think urethane has that low a swell temp, but I don't know. Anyway, I'm interested in polystyrene, so I don't want the foam in my structure getting near or over 165F for any length of time, or else my smooth surfaces aren't smooth anymore. So I asked the tech rep at PTM&W (manufacturer of AeroPoxy) about post-cure, and he said that AeroPoxy really does pretty good without post-cure... the catalogued Tg is about 194-196F with normal cure, but post-curing will give you full confidence of reaching that number. I doubt we could see those kinds of temps in our birds unless we visit Jeff in Arizona and paint the airplane nice and dark. Maybe even not then. But here it is: *** the recommended post-cure for AeroPoxy is 4 hrs. at 150 degrees F... *** which is easy to do with a small heater or even a hair dryer, in a hot box. It also won't be hot enough to swell your poly, so things are looking good if you keep it at 150 but not up to 165. The tech rep said that they had no problem with finish colors away from basic white with AeroPoxy, but he wouldn't give specifics like "yellow is OK, light blue or red are OK, purple or brown are not OK", etc.- since we all know that what our eyes see isn't what the actual color temperature is (we won't go into the infrared/ultraviolet thing)... but I would be entirely confident of using light and medium colors on my AeroPoxied airplane with a post-cure, and no threat of structural softening due to the resin reaching Tg. I didn't say I wouldn't worry about the polystyrene; we've got to keep it below 165 or else it might go bulgy. Post-curing is said to be OK to do no matter how long it's been since you did the initial resin cure, but I think no sooner than 2 weeks after, and no later than 6 months after, is the best. You can do it a piece at a time as you build, or put entire sections or the whole airframe in your hot box and go for it; the limit is what space you have available and your heat source. I figure I can put large assemblies in a box made from 4'x8' sheets of insulation, and a box about 4'x8'x5' high with a 1500 watt heater (with a fan, to keep temps even) will only take a little while to get from 60 deg. to 150 deg., and my digital lab thermometer with the probe stuck in the box will let me hold it there for 4 hours by plugging and unplugging the heater. Temp should be raised slowly, and cooled back down slowly after cure. Now let's talk about that 'stealth' flat black paint job... ;o) Oscar Zuniga Medford, Oregon mailto: taildrags@hotmail.com website at http://www.geocities.com/Pipeline/Dropzone/5610/index.html ______________________________________________________ Get Your Private, Free Email at http://www.hotmail.com ---------------------------------------------------------------------- Subject: Addition to KR2-S page From: HAshraf@aol.com Date: Thu, 9 Sep 1999 10:58:54 EDT X-Message-Number: 5 I have added some elevator constrution pictures to my poject page. The address Now is (after adding the .html the script file): http://members.aol.com/HAshraf/KR2S.html Or click here: Haris Ashraf's KR2S Project Let me know what you think. Haris Haris ---------------------------------------------------------------------- Subject: Gathering awards From: "Richard Parker" Date: Thu, 09 Sep 1999 12:26:25 PDT X-Message-Number: 6 Mike Mims should definately win some type of award for the shorts he is wearing on Haris's elevator construction page. :-) http://members.aol.com/HAshraf/KR2S.html Rich ______________________________________________________ Get Your Private, Free Email at http://www.hotmail.com ---------------------------------------------------------------------- Subject: Re: KR Gathering From: KR2616TJ@aol.com Date: Thu, 9 Sep 1999 15:25:56 EDT X-Message-Number: 7 In a message dated 9/9/99 8:32:10 AM Eastern Daylight Time, richontheroad@hotmail.com writes: << this question has probably been asked a few time but do you haven an estimates on how long it takes to drive from Nashville? also have you posted a schedule of events? Rich Parker >> Mapquest.com lists the driving distance as 80.9 miles. Take north I-65 to west I-24 and follow it to the resort. Remember guys, I live 5 hours driving distance from Lake Barkley............not exactly my neck of the woods. As far as a sch. for Saturday, it is not final at this time and will not be so until I get there and find out just who is going to be putting on specific forums and the times they would like to do them. I have an idea but want to clear it with the participants. Seems like airplanes are going to start arriving around noon on Friday and will arrive steadily from that point on into Saturday. Friday evening will be informal as always with a catered barbecue dinner served. We will hang around the airport as long as anyone wants to. Saturday will pretty much go as it always does with rides, lies and forums followed by our banquet Saturday night. We will once again be doing shortest takeoff and spot landings along with a little extra I might throw in. Friday night we will also be having burgoo (if you gotta ask, you wouldn't understand:-). Dana Overall 1999 KR Gathering host Richmond, KY mailto:kr2616tj@aol.com http://www.geocities.com/CapeCanaveral/Hangar/7085/ ---------------------------------------------------------------------- Subject: Re: Hand actuated brakes From: "dene collett" Date: Thu, 9 Sep 1999 22:48:10 +0200 X-Message-Number: 8 John wrote: > In looking at the various VW magazines, I came across a hand actuated brake > device that allows differential braking. Looks like a dual master cylinder > with two hand levers. Would this be usable for a centrally located hand Hi john My friend`s KR-2 has twin brake levers for hand operation positioned on the front face of the spar between his legs facing upward. I think they are back brake cylinders from a motorcycle with front brake levers actuating them. The left one is shorter than the right for comfortable differential braking with the left hand while holding the stick with the right hand (also between legs--dual stick). I have made a number of flights with him and he seems to handle the setup perfectly. I have a pic of them if you are interested, e-mail me direct if you would like to see it. Dene Collett South Africa denec@netactive.co.za --- 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