04-08-2008, 03:11 PM #1
hydrodragsNEW ADENDUMS ADDED 4/4/2008 (The following is based off of the IJSBA GP class
Rules)•(Top Deck and Hull) can use any kind of composite materials
•(Participant) can use any kind of engines but it MUST BE BASED ON A APBA
HOMOLOGATED RUNABOUT ENGINE
•Full modifications are allowed (crankshaft, cylinders, pistons, crankcases and more)
•Transmission and pump are free but must stay .inboard. . and must be a (water) jet
pump type of propulsion.
04-08-2008, 03:15 PM #2
04-08-2008, 03:25 PM #3
But please consider this....Before this rule change, they didnt consider conversion skis legal either .... rules change as demand grows.... Conversion skis werent allowed when there was only one wanting to run
in a few years, there may be hundreds of ski with prop conversion, or manufactures may make it an option on some of their large craft as gas prices continue to rise. It may not resemble anything like I have done, but they may offer options for drive the same way they do engines on personal watercraft.
Its also possible the propski will be smothered out by narrow thinking, large pwc companies or manufactures of high performance JETSKI parts who worry of losing millions in revenew and mine will be the last one to touch the water.
It will be interesting to see if this will be embraced or shunned.
The idea for mine was born here on Greenhulk after reading about everyone else amazing accomplishments and there couldnt have been a better place for it to happen.
Last edited by RUNWME; 04-08-2008 at 03:36 PM.
04-08-2008, 03:28 PM #4
David, i believe that APBA rule has always been in effect so it's nothing new.
The APBA still does not consider conversion skis legal.
I got WaterTop, the promoter in the HydroDrag events to bend the rules to allow conversion skis in their events even though it was against APBA rules. Perhaps you can convince them to allow propeller equipped skis.
04-08-2008, 03:34 PM #5
the ONE thing that concerned me on a performance note only was would your prop catch the launch ramp gear on take off and damage your boat.....i guess if the prop does not hang lower than your hull it wouldnt.......if the blades pass the bottom of the hull plane and are lower when running then you may have saved yourself some BIGTIME GRIEF anyway..not sure just guessing!
04-08-2008, 03:36 PM #6
04-08-2008, 03:47 PM #7
Soon my tunnel hydro will be here and I will be immersed in getting it going. I really am thinking it will be a good candidate for the dual impeller pump setup with a rxp motor .
04-08-2008, 03:50 PM #8
04-08-2008, 04:03 PM #9
04-08-2008, 04:07 PM #10
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