1971 20 SF Transom project

[Yamtt125]

Well, its about time I start working on this boat if I want to get it done by next spring. I am first beginning with the transom, then I plan on raising the deck and doing other fun and exciting things with her!!! lol.

So far, I have cut out the back of the boat and removed the wood the was previously there. By the picture, you can obviously tell it wasn't in the best condition to say the least.

In the next couple of days, I plan on finishing grinding/ sanding down the inner fiberglass.
Does anybody suggest any particular type of grinder I should use for that..?? And, does anybody have any suggestions on how to get the white crap off the went on the sides and bottom wood in the transom....that is some hard stuff!!!


I also plan on using Douglas fir for the transome....does anybody have any reasons why not too????

Also, I have a couple quick questions on some other random stuff about the boat:
My boat doesn't have any type of core under the gunels, and i thought it was kinda wierd cause most boats do...right??

My sf doesn't have any foam under the deck. I thought that most seacrafts had foam under the floor. Or is that only MA's??

Also, I want to use the talk it came with because its in good condition and I was wondering if anybody knew how many gallons it is. Its the tank that went under the console.

Thanks in advance guys
-Andrew






Here is the crazy hard white stuff I can't remove...

[quonie]

Well I'll be darn. I asked on another thread if anyone tried removing the wood core on the transom from the inside and didn't get a response.
What made you try this method?
Can you show a picture from the stern? Do you plan on building the transom up higher or close the whole thing in?
Your question on the fir. Better off using a high grade marine ply. As for a tool someone suggest a Fein Multimaster
on another thread in this section.Never used one myself but will try it out soon. Where are you located? Keep us updated with the progress

[Yamtt125]

Quonie,
I am doing it from the inside because I plan on puting a new floor in and reconstructing the livewell and bilge access area, so why cut up the outside of the boat when I am going to cut up the inside?
I will get a picture of the stern as soon as a get a chance.
I plan on raising the transom 5in.
thanks for the responce

[strick]

Does anybody suggest any particular type of grinder I should use for that..??




dougfir is soft and holds moisture. Also I dont think they make sheets big enough to cover the entire transom. Use marine grade plywood or composite like Cosa board. air chisel works for the "white stuff"

strick

[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.