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5 Ply vs. 7 Ply Plywood

Discussion in 'Beginners' Lounge' started by Bartman, Jul 28, 2015.

  1. Bartman

    Bartman Defender of the Noob!

    Hi Guys,

    I bought a sheet of 3/8" birch plywood the other day but it's 5 ply instead of 7 ply. It's for a landing gear attach plate and a firewall. I think it's fine for the landing gear attach plate but what about the firewall? I only mention it because I noticed just now that the plans call for 7 ply but I'm thinking 3/8" 5 ply is still plenty for a 100cc if I use fender washers to prevent crushing on the back and a nice broad mount to help the bearing loads on the front side.

  2. dhal22

    dhal22 GSN Sponsor Tier 1

    Very minimal strength difference in my opinion. You will be fine.
  3. Terryscustom

    Terryscustom 640cc Uber Pimp

    7 ply will crush less and add more weight. You will need to prepare for some crush when you install you engine but it's plenty strong as long as you have a four sided engine box. Use fender washers or similar and broad base engine standoffs like SWB sells. Landing gear plate as well, you will obviously have some more structure like aluminum angle or something there to support the gear anyway.
    Snoopy1 likes this.
  4. Bartman

    Bartman Defender of the Noob!

    ok, thanks for the replies, in it goes!

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