The beginning of a twin

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dr gary turner

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Dec 25, 2004
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2,129
Sides: Carbon fiber foam carbon fiber foam 1/64 ply “sandwich “

Bulk heads: 1/32 plywood foam 1/32 plywood foam 1/32 plywood sandwich

All joints are mitered

SST/Mark Bullard building technique.  A very strong light twin.

The twin is an SST XP.  KNOW AS THE ALIEN

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ALLAN YUEN

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Jan 14, 2005
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5,544
Look good light weight C/F tub

what size of long tub? 

what about sponsons?
 

dr gary turner

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Dec 25, 2004
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No yes.  On of the MISSISSIPPI BOYS needs to have Mark make a head button for the motor.  Had a 60 head button in it

Allen, the tub is 42 in long and 7.5 in wide

Andy, the construction technique is Mark Bullard’s 

Sponsons are underway 

foam1/16 ply in the middle and more foam

Sponson pattern will be cut out of plexiglass 

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ALLAN YUEN

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Jan 14, 2005
Messages
5,544
No yes.  On of the MISSISSIPPI BOYS needs to have Mark make a head button for the motor.  Had a 60 head button in it

Allen, the tub is 42 in long and 7.5 in wide

Andy, the construction technique is Mark Bullard’s 

Sponsons are underway 

foam1/16 ply in the middle and more foam

Sponson pattern will be cut out of plexiglass 

View attachment 100095
Is Sponsons use JAE ? Or SST?  And puts shingles or flat bottom ? 
 

ALLAN YUEN

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Jan 14, 2005
Messages
5,544
Very interesting anyway

What kind of engines will you plan install? 
 

Duke Mordja

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Jan 15, 2005
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622
Doc,

What adhesive for the sandwiches?    Looking good.

Duke
 
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dr gary turner

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Dec 25, 2004
Messages
2,129
The plywood was PRE SEALED BEFORE assembly with Total Boat PENETRATING EPOXY. Allowed to dry, sanded 320 assembled and is ready for PPG CLEAR then paint PPG SINGLE STAGE
 

dr gary turner

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Joined
Dec 25, 2004
Messages
2,129
Thanks

The wood in the middle of the sponson is to prevent the sponson from fracturing between the boom/sponson tubes

I had that happen on my 101 single JAE racing gas hydros at Voodoo about a year ago. Water was rough.
 

TomGracey

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Dec 5, 2018
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367
Like the tub fixture
 
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dr gary turner

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Dec 25, 2004
Messages
2,129
Sponsons are born

The plexiglass template is held on to the sandwich with double stick tape then cut out on the bandsaw

They are then sanded to a perfect match

Sheeting is all that is left

Quick and easy way to build sponsons 

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