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Old 11-21-2017, 06:50 PM   #26
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Default Turtledeck

Only wood for me. I have done one metal and it did not look nearly as good as the wood. Reduce all bulkhead plywood to 1/8". Reduce all other dimensions except skin by at least 1/16". Cut large hole in center bulkhead(similar to aft bulkhead) and cover hole with fabric. Removeable floor with piano hinge down the center. No fasteners for floor, baggage holds it in place. Fold the floor and remove it for acro. Small fabric pouch with Velcro on right side of cockpit for paperwork, etc.
Fold the sleeping bag and use it for seat cushion. Tent and hang up bag tied in place under the baggage floor. Tool bag and Misc go between the heel runners forward of stick. Coffee, iced tea and catering go wherever you can find room. In case anyone thinks this is bs I traveled this way with the S1S for ten years. The camping gear was usually just for Oshkosh.


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Old 11-21-2017, 08:29 PM   #27
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Personal experience with wood and aluminium turtle decks made per the drawings, the aluminium one was a lot lighter, like half.

I faired the aluminium TD so the final result was straight and true.

Andrew


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Old 11-21-2017, 08:30 PM   #28
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We went with wood because:

That's what plans show how to build.
It is what I have the most experience in using.
It is the material I have the most tools for.
I could customize it without a lot of trial and error and fix mistakes with ease (fiberglass is easier yet but....)
I could locate a small shelf behind the storage to place the 2 GPS antenna so I wouldn't have to mount them externally.

I dont think the material matters as much as actually finishing one of any kind.
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Old 11-21-2017, 08:48 PM   #29
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Quote:
Originally Posted by garyg View Post
We went with wood because:

That's what plans show how to build.
It is what I have the most experience in using.
It is the material I have the most tools for.
I could customize it without a lot of trial and error and fix mistakes with ease (fiberglass is easier yet but....)
I could locate a small shelf behind the storage to place the 2 GPS antenna so I wouldn't have to mount them externally.

I dont think the material matters as much as actually finishing one of any kind.
Pitts S-1S plans page 242 has the aluminum turtledeck. It's out of order, probably because it's from 1974, instead of 1970 when the wooden turtledeck (220) was drafted for the S-1S plans.

I've found it to be a big change from the rest of my project. It's one of the few formed metal sections on the plane. If you have antennas or an ELT, wood is probably the way to go. I didn't see that consideration mentioned previously.
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Old 11-22-2017, 01:49 AM   #30
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Default Turtledeck

RE: the Aviat plans, the metal turtledeck .025 skin only weighs approx. 3.5#. 1/16 mahoghany ply skin is 1.87#. I think my lightweight wood turtledeck with floor but no door was just over 4#. Still looking for my notes. The wood floor weighs almost 1#, reducing the bulkhead ply from 1/4 to 1/8 must be close to a #.
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Old 11-22-2017, 02:16 AM   #31
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Use carbon fiber
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Old 11-23-2017, 11:43 AM   #32
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Thanks everyone for the great replies, some great ideas here.

I'm looking at maybe doing metal bulkheads with a plywood skin and bonding it. If all else fails seems like wood could be the way to go, and a good point was made about saving weight so far back. I'll be getting started on it soon, I will keep you guys up to date with it.
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Old 11-23-2017, 02:02 PM   #33
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I found “Luan” works good for non structural things. Even used it for my floor boards (Doubled up for extra strength). Very easy to work with and super light. Trimmed almost 25lbs off the aircraft when all was said and done.
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Old 11-23-2017, 03:49 PM   #34
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What's Luan ?
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Old 11-23-2017, 04:08 PM   #35
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Luan ply is usually the face of hollow core doors as a reference; at least in the US. Non structural but pretty light as the core is lighter than the face material; all the plys are not the same stuff.


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