---------------------------------------------------------- Pietenpol-List Digest Archive --- Total Messages Posted Fri 12/14/07: 2 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 06:34 AM - Re: Jack Textor's Control Horns (Jack T. Textor) 2. 10:09 AM - Re: What should a fiberglass cowling weigh? (Steve Glass) ________________________________ Message 1 _____________________________________ Time: 06:34:05 AM PST US Subject: RE: Pietenpol-List: Jack Textor's Control Horns From: "Jack T. Textor" Chris, After trying many different methods I used a bead roller from Harbor Freight. I have the 18" model, but the 12" would be most adequate. Even after rolling, it took some tapping with a dead blow brass hammer at the nose and the tips to flatten. And a little grinding under the center tips. I was very happy how they turned out and the pro welder I took them to said the good fit made it easy to weld. Wish I had his talent for welding. I own a mig, tig and gas welders and still stink. I was dreading doing the control system but it has really been a nice change. It looks like your project is really coming along. Again thanks for your website, it has been most helpful. If you send me your address, I will mail you cd's of my project to post. I posted some new pictures on my site of the roller. They are on the Piet Project page, at the bottom. Take care, Jack www.textors.com ________________________________ Message 2 _____________________________________ Time: 10:09:09 AM PST US From: Steve Glass Subject: RE: Pietenpol-List: What should a fiberglass cowling weigh? Hi Gordon I understand what you are saying but the cowling is a structual part and no t just a skin. 1 layer of 18 oz roving will weigh the same as 3 layers of 6 oz. There are many different ways to get the weight down. Does anybody else ha ve some typical cowling layups? Send Steve From: gbowen@ptialaska.net Subject: Re: Pietenpol-List: What should a fiberglass cowling weigh? Steve, Think using roving will absolutely make a very heavy composite part, never used in composite homebuilts for skins. Like the idea of using the current part as a female mold. Two plies of 6 oz. carbon with "hat sections" using 3 lb/cubic ft foam core where stiffeners are need ed, does the trick. Carbon is stiff anyway, stiffen the edges where the two or three parts come apart is all that is needed on a 200 mph Cozy or Longeze. A Piete at 70 mph wouldn't need that much. Next time anyone sees a Longeze or better yet a Glassair on the flightline, give the cowling a good looking over. The skins are very thin with stiffener around the air outlet and inlet lips meet fuselage and along where the side piano hinge is laminated in. (pull the hinge pins and a couple screws to remove the cowl) Gordon ----- Original Message ----- From: Steve Glass To: pietenpol-list@matronics.com Sent: Thursday, December 13, 2007 10:23 AM Subject: Pietenpol-List: What should a fiberglass cowling weigh? Hi It seems to me it would make sense to wax up the existing cowl and use that as a plug to make a new female mold. Then different cowlings could be produced Knowing the surface area a layed up weight can be calculated. In the boat business we would use glass "cloth ranging in weights from 1 oz to 32 oz depending on the application. I would think a 3/4 oz mat and 18 oz roving with some local stiffners or so me balsa core would be a good starting point. A lot of work for a few lbs of weight that will probably be in the right place anyways. 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