The beginning of a twin

[dr gary turner]

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

 

[ALLAN YUEN]

Look good light weight C/F tub

what size of long tub? 

what about sponsons?

 

[charles siler]

Nice start boc me like!!!

 

[Andy Brown]

Nice work Doc!  Do I spy an OPS 80 on the work bench?

 

[dr gary turner]

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 

 

[Terry Keeley]

Nice!

 

[ALLAN YUEN]

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 ? 

 

[dr gary turner]

XP sponsons.  JAE characteristics

No shingles on XP

 

[ALLAN YUEN]

Very interesting anyway

What kind of engines will you plan install? 

 

[dr gary turner]

Mod CMB 101

 

[Duke Mordja]

Doc,

What adhesive for the sandwiches?    Looking good.

Duke

 

[dr gary turner]

Tub, CA. Super strong bond

Sponson, Maas 2 part epoxy slow cure

 

[dr gary turner]

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

 

[PaulHail]

Looks good doc, I like the composite sandwich construction.

 

[dr gary turner]

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]

Like the tub fixture

 

[Tom Foley]

Great stuff !

 

[Joe Wiebelhaus]

Lick the tub fixture

Why ?

 

[TomGracey]

Why ?

Oppp's I meant LIKE the tub fixture

 

[dr gary turner]

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