Today's Message Index:
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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
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| Subject: | Jack Textor's Control Horns |
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
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| Subject: | 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.
Steve snowed in in Maine with more coming this
weekend.
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