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tonyrenshaw268(at)gmail.c
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 Posted: Tue Jun 08, 2010 4:01 am Post subject: Tunnel Bulkhead Substrate |
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Gidday,
I am after advice on stiffening bulkheads in my tunnel, now that I have opened it up at the top to gain access to finger brake shelf etc. Like all of us, I have blue foam coming out of my ears, but I've also used ply as a substrate here and there, and I know about light weight composite substrates like Divinycell. So, does anyone speak positively about using a specialised foam substrate instead of blue foam with BID either side, or should I just use ply, or is even good old blue foam good enough??? I could always add an extra layer of BID for the weaker the substrate.
I need two of these bulkheads, one going across the tunnel from floor to roof of tunnel at the level of the vertical face of the thigh support, and a forward bulkhead just aft of the tunnel firewall. All help gratefully accepted.
Rg
Tony Renshaw
Sydney Aussie
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fklein(at)orcasonline.com
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| Posted: Tue Jun 08, 2010 7:43 am Post subject: Tunnel Bulkhead Substrate |
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On Jun 8, 2010, at 4:59 AM, Tony Renshaw wrote:
| Quote: | I am after advice on stiffening bulkheads in my tunnel, now that I
have opened it up at the top to gain access to finger brake shelf
etc. Like all of us, I have blue foam coming out of my ears, but
I've also used ply as a substrate here and there, and I know about
light weight composite substrates like Divinycell. So, does anyone
speak positively about using a specialised foam substrate instead of
blue foam with BID either side, or should I just use ply, or is even
good old blue foam good enough???
|
Tony,
Personally, I would never use blue foam where thin sheets are called
for, even if I could make a simple jig and sand it down to say 1/8" or
1/4". For what you describe, I would find some LastaFoam...however,
since the amount you're talkin bout is so small, I would think 1/8"
birch acft plywood would serve.
Fred
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g-iani(at)ntlworld.com
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| Posted: Tue Jun 08, 2010 10:34 am Post subject: Tunnel Bulkhead Substrate |
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Tony
For the bulkheads I built when doing the major modifications to my tunnel I
used 3mm ply with two plies of BID on both sides.
This gives a nice strong structure and the weight penalty is very small
Ian Rickard G-IANI XS Trigear, 300hours
Europa Club Mods Specialist
e-mail g-iani(at)ntlworld.com
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Gary.Leinberger(at)miller
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| Posted: Tue Jun 08, 2010 10:40 am Post subject: Tunnel Bulkhead Substrate |
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I was originally going with the (heavier) Subaru engine and was worried about sufficient strength with a heavier engine. So I used thin plywood glassed and bolted on both sides to make the firewall (angled at about 30 degrees) and tied this to a piece of plywood that runs back to the rear of the cockpit module. I glued this to the side, and and glassed it to the firewall so it makes a tee with the firewall. Then I used thin angle aluminum to tie this to thin plywood 9also glassed and reinforced with thin aluminum sheet on the cockpit sides of the center tunnel. The bolts for the frame that holds the bungies (I actually used springs) goes through the plywood, the thin aluminum and the cockpit module.
I weighed all this before I put it in and it probably added 8 - 10 pounds or so. I haven't weighed the plane yet. I rationalize this added weight in part by noting that the center board also serves as a mount for everything in the center console which is necessary as I have the finger brakes, auto pilot, all the various brake hoses, gas hoses, throttle, etc. All those mounts would weigh something.
Don't know if this was worth the effort but it sure is strong. I did learn that putting the foam between glass (or thin plywood and glass) increases the strength by several magnitudes - but you need to figure in the force vectors to get the proper strength.
The cockpit picture shows the plywood on the outside that is bolted to the bungie and front wheel frame and also bolted and fiberglassed to the tee shaped piece inside the tunnel that runs back to the rear of the tunnel. On the cockpit picture you can see Bud Yerly in the background, probably silently (or not so silently) cursing builders who add their little "improvements" that cause interference problems later on -
Gary Leinberger
A237
Lancaster, Pa.
________________________________________
From: owner-europa-list-server(at)matronics.com [owner-europa-list-server(at)matronics.com] On Behalf Of Fred Klein [fklein(at)orcasonline.com]
Sent: Tuesday, June 08, 2010 11:16 AM
To: europa-list(at)matronics.com
Subject: Re: Tunnel Bulkhead Substrate
On Jun 8, 2010, at 4:59 AM, Tony Renshaw wrote:
| Quote: | I am after advice on stiffening bulkheads in my tunnel, now that I
have opened it up at the top to gain access to finger brake shelf
etc. Like all of us, I have blue foam coming out of my ears, but
I've also used ply as a substrate here and there, and I know about
light weight composite substrates like Divinycell. So, does anyone
speak positively about using a specialised foam substrate instead of
blue foam with BID either side, or should I just use ply, or is even
good old blue foam good enough???
|
Tony,
Personally, I would never use blue foam where thin sheets are called
for, even if I could make a simple jig and sand it down to say 1/8" or
1/4". For what you describe, I would find some LastaFoam...however,
since the amount you're talkin bout is so small, I would think 1/8"
birch acft plywood would serve.
Fred
| | - The Matronics Europa-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?Europa-List |
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