Author Topic: Which ply is heavier ? (Read 1230 times)

Allan Perret · « **on:** March 09, 2010, 09:34:36 AM »

1/8" lite ply or 1/16" regular ply.
I dont have any lite ply on hand to compare.
I am thinking these two materials have similar strength, any opinions on that ..

john e. holliday · « **Reply #1 on:** March 09, 2010, 09:43:27 AM »

depends on what you are using it for. For bellcrank mounts, landing gear mounts and the laminations on the fuselage sides, go with 5 ply plywood. !/16 ply is great for laminatiing the sides on built up fuselages. The Light ply is good for formers or any where you are not worried about compressing the wood, like on the nose of profile airplanes motor mounts. Light ply is as the name says, light would for areas you don't need much strength in. Now I am confused.

Allan Perret · « **Reply #2 on:** March 09, 2010, 01:16:33 PM »

Quote from: john e. holliday on March 09, 2010, 09:43:27 AM

depends on what you are using it for.

Huh

I am starting on a new profile fuse, the plans call for 1/8" lite ply fuse doublers.
Dont have any, but I do have 1/16" regular ply, which is 3 plys, not 5.
Was wondering how they compare weight and strength wise.

Jim Thomerson · « **Reply #3 on:** March 09, 2010, 03:41:14 PM »

If you use lite ply on the nose of a profile airplane cut it out so that the engine lugs can rest on the motor mount beams. Never put light ply under an engine mount.

Ward Van Duzer · « **Reply #4 on:** March 10, 2010, 02:20:32 PM »

But there is a third kind of plywood. Lite ply is kind of junky with voids and knotholes and is pretty soft stuff. Certainly 5 ply 1/8 is the strongest, and heaviest but I have found it unnecessary in my profiles. Enter Frank Tianos Mighty Lite 3 ply x 3mm. (I think Midwest also has a version of this!) I put this on the outboard fuselage side back over the high point of the wing, and cutting out the area over the maple mm's. As Jim says above, mount the engine lugs on maple, or any type of engine support. (Aluminum, Nylon, or whatever). The inboard fuse gets a shaped and hollowed 1/2 inch balsa tripler. Do not hollow over the wing joint. Note: No plywood here! That's it. Lite, strong, and it absorbs the vibrations. My piped profile Force is over 10-12 years old now and shows no signs of the "aging profile nose"!

W.

Michael Boucher · « **Reply #5 on:** March 10, 2010, 10:20:06 PM »

So the engine is directly mounted to the maple beam mounts. With having only one doubler on the outside of the mount. The inside of the mount getting a 1/2" block of balsa cheek mounting directly to the maple mounts. I was in a hobby shop last weekend and the owner didn't understand what I meant by maple beam engine mounts, lol.

Author Topic: Which ply is heavier ? (Read 1230 times)

Allan Perret

Which ply is heavier ?

john e. holliday

Re: Which ply is heavier ?

Allan Perret

Re: Which ply is heavier ?

Jim Thomerson

Re: Which ply is heavier ?

Ward Van Duzer

Re: Which ply is heavier ?

Michael Boucher

Re: Which ply is heavier ?