Can I use 1/2 ply for a UJ Bottom?

[MuddlerOH]

After buying a UJ kit about 18 months ago, I decided it was finally time to build it. So far I have assembled the ribs with gussets, cut and scarfed the sides and this week I hope to attach the sides to the stems and the ribs. I am using 4 ribs. The side are 1/4 inch ply, but I bought 1/2 inch ply for the bottom. Is this too heavy or can I go ahead and use it? Other than weight, what are the upsides/downsides.

Thanks.

 

[oldsparkey]

If this is your 1st one , I would suggest doing it with the wood Uncle John recommends which is 1/4 inch. It would be easier to work with , weigh less and if you are going to glass the boat then will be more then ample for the job.

I usually use 1/8 th inch wood since I like light weight boats. If you want to use the 1/2 inch , then do it , it is your boat but I think it is overkill.

Chuck.

 

[Kayak Jack]

Look at it this way, Muddler. If you use 1/2", and can lift that boat on and off your vehicle, NO ONE will ever mess with you.

 

[JEM]

1/2" does sound like a bit of overkill.

Pro: you'll have a super stiff hull that is tough
Con: weight.

I'd think about making a trip back to the store for some 1/4"

 

[keith]

1. I would not use 1/2 " plywood.
2. If you use 1/4" or less, you need bottom ribs (more) for support.
3. If you use 3/8" plywood, you do not need bottom ribs, if the bottom is not wider than 26".
4. If you ues 1/2" you add weight and cost, you lose your flex, it sits lower in the water. I do recommend 1/2" for the botton if your boat is 20 feet long and 6 feet wide and your going to put a 100 HP engine on it.
Have a nice day, Later Keith

 

[MuddlerOH]

I ordered the 1/4 inch ply today.

 

[oldsparkey]

All you need is one sheet ...... NOW you tell him (Jack etching and edging in here)

Tell him about the tide too, Chuck

Chuck.

 

[oldyaker]

Muddler......I just built one from 1/4" garbage ply....plenty thick enough. Half inch is way too big.

 

[Scooter]

One advantage to 1/2 would be keeping weight down low resulting in less tippyness.