Surface drive for a hydroplane

[stupidbaker57]

Hi to all,
I'm new to here but not to the water. I've lived most of my life (not dead yet)on the same lake and have had all sorts of power boats from a Mengees special 12, a number of 3 point hydros, and my favorate that is now long gone, a 15 ft GW invader tunnel hull with a 150 xs Merc.
I am thinking of building a surface drive simuler to one I saw on Utube that used a Hayabusa bike engine in a 20+ ft boat for off shore use.
Other than the fact that the drive would need to be custom built which wouldn't be too much trouble, after all I built cars from scratch, what would a good length boat be? I was thinking of the 11 ft range with a drive shaft type motorcyle engine behind the drivers seat.
Comments? Advice?

[afr]

hey welcome to the madness 11 ft to me seems way small for a habusa direct drive surface drive ??

http://www.screamandfly.com/showthre...-paint-siminar

we will be going over all the details on how to do all the math a full scale lofting
i to am a hydroplane fan

[stupidbaker57]

Damn!,,,,, I was in Fla. last week (truck driver) Anyway,,,,I was more towards the shaft bike of lesser HP ( Hyabusa's aren't cheap) I was more towards a go kart-indy car comparision. The boat would be for fun and not racing. I had a 11 footer a long way back and thought it was the right length for the 50 I hung on the back. I was just wondering if the length and mild (80-100) HP would be doable?

[afr]

maybe i missed something this is the engine here http://www.2010hayabusa.net/hayabusa-specs.html
you where talking about right

[stupidbaker57]

Yes that is the engine,,,,,,but I'm old and CHEAP!!!!!!!!!! I was looking to use an older 4 cly bike engine that runs a drive shaft. If you search Utube for Offshore hyabusa boat, you may find the one I was refering to.

[afr]

yea ok i seen that a few years back but never got to see it run yet
from what i see you need to leave the gear box on it so you can get the prop rpms up more
still i think 11 ft is to small more like 15/17 these bike motors IMO dont have the touqe to carry any kinda weight and pushing even a light boat threw water equals weight with the drag be like riding the bike with the brakes on

[stupidbaker57]

I have a number is sketches of different designs. When I figue out which one is best I will convert it to a mechanical to scale drawing and post here for further coments. I may have found a 3 pt hydro in Maine if it's long enough.

[Storz]

Pretty wild

http://www.youtube.com/watch?v=gUTugwF2MY8

[john j 80 viking]

This is the first thing I thought of when I read your post.

[HYDRO FAN]

A 1 litre curcuit race hydro is around 15 to 16 ft long and does about 100mph, so don't be a mad scientist and wind being the next statistic, perhaps you need to go to a race meeting and have a look.
Russell