21 GT by Zippkits

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Nice build !!

Are those outer buttons on the boom tubes part of the kit ?

And do I see heat shrink on the inside of the sponsons on the boom tube slip joint?
Are you using that in place of bolts to hold the sponsons on ?
 
Nice build !!

Are those outer buttons on the boom tubes part of the kit ?

And do I see heat shrink on the inside of the sponsons on the boom tube slip joint?
Are you using that in place of bolts to hold the sponsons on ?
The buttons are tubes that go through the sponsons and are part of the kit and yes shrink tubing is holding the sponsons in place. I can't take credit for that idea but it works very well and adds zero weight which is so important to a B hydro.
 
Cool idea,,, I once read somewhere about using radio box tape, but I thought nah... don't want my sponson flying off in the middle of a turn... 🤪

I would use nylon bolts before radio box tape....but heat shrink sounds like it could work... weight trade off is probably the same as 6-32 nylon bolts and nuts setup..

Do you thin CA the tubes where they slide together first ??
 
Cool idea,,, I once read somewhere about using radio box tape, but I thought nah... don't want my sponson flying off in the middle of a turn... 🤪

I would use nylon bolts before radio box tape....but heat shrink sounds like it could work... weight trade off is probably the same as 6-32 nylon bolts and nuts setup..

Do you thin CA the tubes where they slide together first ??
Just heat shrink, nothing else.
The stuff I use has a tacky glue on the inside that activates with heat, not sure if all tubing comes that way.
The other benefit is you can change out a broken boom tube very quickly!
 
Just heat shrink, nothing else.
The stuff I use has a tacky glue on the inside that activates with heat, not sure if all tubing comes that way.
The other benefit is you can change out a broken boom tube very quickly!
Hi Tim, boat looks real nice! Have you run it with the heat shrink tubing? Just curious if the turn fin side stayed together?
 
Hey Ron,
I have been running my gas hydros with nothing but heat shrink for the last 6-8 years and never had any problems at all! Must give all the credit to Tyler Gerrard,he is the first one I ever saw use this system to hold sponsons in place!
 
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