Dave Frank SP 40

[jack dyer]

I was given a set of plans for the sport 40 and was wondering could it make a good q hydro with today’s power. Would the boat be happy running 75-80 mph. I was thinking to open up the inside deck area to accommodate running a 2p set up and keep the batteries and esc up front which should help with the cg.
Thanks for any input

 

[Mike Hughes]

That would be pushing the design of that boat at those speeds. Is it version 1 or 2?
Mike

 

[jack dyer]

I’m going to say probably version 1! The instructions say by David Frank and Jerry Dunlap.

 

[Mike Hughes]

V2 the center section looks like a wing shape. It used to blow off quite a bit at 60-65 until I did a mod to the sponsons. Made then steeper and deeper. Added 3/16 to sponson pad at sponson transom and then tapered it to zero at the front of the pad.
Mike

 

[jack dyer]

Thank you for that info I will take a good look at the plans and see what I have to work with maybe I can use some measurements off my other hydros and see what I can come up with. I do have a whip sport 40 to build.