Thanks to all who have contributed to this thread. Now I know exactly what I will make the wing skins out of, the next time I build some.
I think that the question was, what is the reason why Dynel is no longer in favour? It is most likely hard to get, but I heard that it is a bear to work with as it wants to move around a lot an that when it is cured that it bristles up like a porcupine when you sand it. This is only hearsay, because I have never seen the stuff and really don't care if I ever do. See N64KR at http://KR-Builder.org - Then click on the pics Daniel R. Heath - Columbia, SC da...@kr-builder.org See you in Mt. Vernon - 2004 - KR Gathering See our EAA Chapter 242 at http://EAA242.org -------Original Message------- From: KRnet List-Post: krnet@list.krnet.org Date: 04/18/04 15:41:26 To: KRnet Subject: RE: KR> RE: KR Dynel "Steve: my only real experience with Kevlar is that it makes wonderful bulletproof vests" NOT. "Bulletproof"; It slows the penetration of bullets but many types of bullets /calibers can penetrate a level IV vest The correct term would have been "Bullet Resistant" or "Ballistic Vests" just as most watches are "Water Resistant" and a few are "Water Proof" (to n number of feet) I have a vest that we shoot during my training courses to show the students that "Bulletproof" really is just a movie/marketing term. Movies are wonderful fantasies but real life can be a killer. I'm waiting on the vest made from spider silk, they gene spliced a spider and goat, the goat produces the silk protein in it's milk, spider silk is about three times stronger then Kevlar. http://www.forbes.com/global/2001/0219/061.html this was written in 2001. What would happen if Auromat was made with spider silk? -----Original Message----- From: krnet-boun...@mylist.net [mailto:krnet-boun...@mylist.net]On Behalf Of Doug Rupert Sent: Sunday, April 18, 2004 5:49 AM To: 'KRnet' Subject: RE: KR> RE: KR Dynel Steve: my only real experience with Kevlar is that it makes wonderful bulletproof vests but since I don't plan on entering combat zones with the KR, I think I'll leave it's usage to the military. Besides from what I've read the stuff is a bitch to work with. I believe your money would be better spent on glass cloth as carbon fiber prevents one from using buried antennae and these are a major drag factor to the finished product. I have 2 Nomex flight suits that I value highly and believe they would be of better use to a pilot than Kevlar. Doug Rupert. Simcoe Ontario -----Original Message----- From: krnet-boun...@mylist.net [mailto:krnet-boun...@mylist.net] On Behalf Of Stephen Jacobs Sent: Sunday, April 18, 2004 4:18 AM To: 'KRnet' Subject: KR> RE: KR Dynel My curiosity is probably a bit outdated. The original KR designs called for a material called Dynel. From what I have read, this was more of a draper's synthetic fabric like rayon etc. - not intended to be a structural medium. It is however reported to be very effective (strong / tough?) when used as a composite fabric. The following ectract from an article by jck Cox (At Oshkosh) on the KR1. -- "Dynel" is a synthetic fiber made by Union Carbide. It is used on the KR-1 in much the same way as fiberglass cloth is used to make cowlings, etc. on other planes. Dynel has the advantage of being four times as strong as glass, but only half as heavy. The cloth is very soft and can be stretched to fit almost any shape. 4 ounce per square yard This outer shell is incredibly light and strong. This writer personally observed Ken Rand walking up and down the wing of the KR-1, and at the risk of a repair bill and/or a fat lip, I took the thin trailing edge of the elevator between two fingers and tried hard to deform it in any direction If it was cost effective and did the job, there must be reasons why it is no longer used - does anyone know what those reasons are. After a brief encounter with Kevlar, I hope to never use this uncooperative material ever again - even if it is 6 times as strong, half the weight and free. What is working best for a KR2S? Steve J _______________________________________ to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net please see other KRnet info at http://www.krnet.org/info.html _______________________________________ to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net please see other KRnet info at http://www.krnet.org/info.html _______________________________________ to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net please see other KRnet info at http://www.krnet.org/info.html
