1971 20 SF Transom project

[Bigshrimpin]

DougFir A/B marine ply is what I used for my transom.

[Yamtt125]

BigShrimp,
Whats the difference between dougfir and dougfir marine ply?
Is one softer than the other?

Strick,
what type of tool did you use with that disk?...how many amps was it? Do you recomend a particular manufacturer?

Thanks for the responces.

Still looking for any info on the size of the tank I have and why nothing my boat was cored with plywood or anything.

[WillyC]

A 4 1/2 inch grinder is what you need. I bought the Makita from home depot about $100. I think its 5 amps. That tool and a shop vac are two things that you cant do without. You will be using them almost every day. Happy grinding!

[warthog5]

The standard is A-B Douglas Fir marine.

There is no diffrence in the wood in Doug Fir [DF] ply's and DF marine ply's, except the marine has a higher standard about void's. The marine has basicly no void's.

There are other maine plywood's. [Okoume & Meranti]

I personally would not use them as a transom core. They are more expensive and have better/smoother outer ply's.
They would be a excellent choice if you were building a whole wooden hull.

The transom core on the boat's we have is highly imbeded in fiberglass on both side's, so that super looking surface on Okoume is $130 a sheet & Meranti is $95 a sheet mean's nothing. A/B DF Marine here is $74 a sheet.
Any of these plywood's need extra attention to the end grain and any holes you bore thru it.

[GradySailfish]

That white stuff was a PIA. Get yourself a nice quality chisel...preferably a concrete/brick splitting chisel and a hammer. Get in between the white stuff/putty and whatever surface it's adhering to and give it a few whacks. That putty SC used is very solid, very dense but also very brittle.

Lookin good Yamt125. The older SC didn't have the same arrangment in the hull as the later SC's. My 1978 doesn't have stringers like you, instead it has these "pontoon" type stringers filled with foam. For your project I'd take a look at Jason "Trayders" project and make it my template.

http://www.classicseacraft.com/Trayder/index.html

The MA I think is more comfortable and utilitarian, but the SF is a far better looking boat...much nicer lines!

[warthog5]

What your talking about is resign/Cabisol mix.

Strick posted the correct tool. A zip gun.