Classic SeaCraft Community  

Go Back   Classic SeaCraft Community > Recovered Threads
FAQ Community Calendar Today's Posts Search

Notices

Reply
 
Thread Tools Search this Thread Display Modes
  #1  
Old 04-30-2017, 07:12 AM
lelandtampa lelandtampa is offline
Recovered
 
Join Date: Apr 2017
Posts: 158
Default Transom layup

So i just bought a 78 20' MA and it needs a new floor and transom. Here is how i plan to layup the new transom. any thoughts would be appreciated.It will be all epoxy resin and engine will be transom mounted.

OUTSIDE TRANSOM SKIN
LAYER OF Chopped MATT AND RESIN TO FILL IN GRINDING GAPS
DOUBLE 3/4" MARINE GRADE FIR PLYWOOD laminated with epoxy putty
1708 ACROSS THE TRANSOM TABBED 2" TO HULL
1708 tabbed 4"
1708 tabbed 6"
1708 tabbed 8" repeat with 1708 (until factory thickness of inside glass is built up)
Reply With Quote
  #2  
Old 04-30-2017, 08:18 AM
pelican pelican is offline
Senior Member
 
Join Date: Apr 2010
Location: cape may nj
Posts: 596
Default

Quote:
Originally Posted by lelandtampa View Post
So i just bought a 78 20' MA and it needs a new floor and transom. Here is how i plan to layup the new transom. any thoughts would be appreciated.It will be all epoxy resin and engine will be transom mounted.

OUTSIDE TRANSOM SKIN
LAYER OF Chopped MATT AND RESIN TO FILL IN GRINDING GAPS
DOUBLE 3/4" MARINE GRADE FIR PLYWOOD laminated with epoxy putty
1708 ACROSS THE TRANSOM TABBED 2" TO HULL
1708 tabbed 4"
1708 tabbed 6"
1708 tabbed 8" repeat with 1708 (until factory thickness of inside glass is built up)

chop strand matt and epoxy doesn't play well together...epoxy and gel coat - it can be done,but....


using wood core - the holes will require overboring,filling with a thickened epoxy,then having the holes drilled through the epoxy - to protect the coring from water intrusion.water intrusion into wood is never a good thing.plywood will absorb water,like a sponge."saltwater preserves wood,freshwater rots wood" -


using a composite board,like Penske board/coosa board avoids all that and allows the use of polyester compounds to laminate;along with the composite being a dense foam,with glass fibers on the outside,this composite will absorb nothing,weighs 45%less than wood and it will last indefinatley


there's other options sir....including a half ceramic/half Penske/coosa board transom core - lots of manufactures use that approach,which seems to work out very well
__________________
do not let common sense get in your way
Reply With Quote
  #3  
Old 04-30-2017, 08:22 AM
kmoose kmoose is offline
Senior Member
 
Join Date: Jul 2006
Location: Ocala, Florida
Posts: 1,817
Default

Spend the money on 3/4 Coosa for the transom over marine ply. It is amazing to work with and 30% lighter were you need to save weight. I would also recommend Nidacore for the decks. Full dressed Nidacore is a quarter of what marine ply weighs before you even glass it and both products are forever with zero rot or water intrusion issues.
__________________
[b]The Moose is Loose !
Reply With Quote
  #4  
Old 04-30-2017, 12:01 PM
jorgeinmiami jorgeinmiami is offline
Senior Member
 
Join Date: May 2005
Location: Miami Fl
Posts: 1,613
Default

I'm almost done with my transom. I also went from the out side dug out the old wood cleaned it up and replaced the skin I cut out. I went with a product called Arjay which is a pourable material. I needed 3 buckets for mine. After it cured it's hard as a rock. I did layer the skin back on with 3 layers of 1708 and am now in the fairing part. If you plan on keeping the boat for awhile use some kind of composite materials. It lighter stronger and will never rot.

And I also replaced my floor with nida core and it's a lot better than wood . Lighter stronger and never rot. Just leave some wood to attached the console and t-top
Reply With Quote
  #5  
Old 04-30-2017, 03:25 PM
lelandtampa lelandtampa is offline
Recovered
 
Join Date: Apr 2017
Posts: 158
Default

on the Arjay did you use 15 gallons ? did you pull the outside skin off? how did you pour it in with no skin?
Reply With Quote
  #6  
Old 04-30-2017, 04:24 PM
DonV DonV is offline
Senior Member
 
Join Date: Jul 2004
Location: Apollo Beach or Islamorada
Posts: 3,488
Send a message via ICQ to DonV
Default

"how did you pour it in with no skin?"......very carefully!


"I did layer the skin back on with 3 layers of 1708"

Please note the above quote in Jorge's post. It took 17 gal to do my 23, all the way to the very top on both sides.
Reply With Quote
  #7  
Old 04-30-2017, 05:33 PM
jorgeinmiami jorgeinmiami is offline
Senior Member
 
Join Date: May 2005
Location: Miami Fl
Posts: 1,613
Default

Yes I put the skin back on 1st and I used 3 buckets of 5 gallons . I thought about some duct tape but it was a little too redneck for me.
Reply With Quote
  #8  
Old 04-30-2017, 06:31 PM
DonV DonV is offline
Senior Member
 
Join Date: Jul 2004
Location: Apollo Beach or Islamorada
Posts: 3,488
Send a message via ICQ to DonV
Default

Here ya go Mr. lelandtampa,

Skin off and wood removed, skin back on, poured and ready for the engine.
Attached Images
 
Reply With Quote
  #9  
Old 04-30-2017, 06:42 PM
lelandtampa lelandtampa is offline
Recovered
 
Join Date: Apr 2017
Posts: 158
Default

got it i couldnt figure out if you used the original skin or layed up a new one on a table then glassed on. thank you for the visual.
Reply With Quote
  #10  
Old 04-30-2017, 07:04 PM
jorgeinmiami jorgeinmiami is offline
Senior Member
 
Join Date: May 2005
Location: Miami Fl
Posts: 1,613
Default

Mine was a little different since I raised my transom to 25 from the factory 20

If your going thru the effort raise it to 25. But actually since you have a MA a fellow member advised me to to 26 1/2 because of the splashwell and the mounting bolts of the engine would have a issue
Reply With Quote
Reply


Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 11:54 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
All original content © 2003-2013 ClassicSeacraft