Re: Forced air ventilated stepped hull?
 

Got a little mixed up there...was thinking of a drag boat race. Guess I'm not getting enough sleep.......ZZZZZZ

Re: Forced air ventilated stepped hull?
 

Challenger, yes the GL,T2x Challenger used ventilation ports on their 21 v back in the 80's. Didn't seem to do much.

Re: Forced air ventilated stepped hull?
 

I've got an idea for a ventalated hull that doesn't require steps but does the same job because it's not the steps that do the work, it's the air bubles under the hull that reduce the friction.

I'm not an engineer so who knows if it would work but a flat bottom boat could be easily re-configured to do a side by side test.

Design would be a derivative of a standard bottom boat but would have air holes underneath, the bottom would look something like this;

Re: Forced air ventilated stepped hull?
 

I was thinking along the same lines a while back....but wondered where to get the air from...and if it had to be pressurized with an air pump or compressor. I'm still waiting for my membership to be posted....so I can get those images..probably 2 or 3 more days.

Re: Forced air ventilated stepped hull?
 

Airpacker....just wondered if I could get any pictures or information on how Challenger did it.....as I'm still convinced that a ventillated hull would have better performance....just don't think that they were doing it right...it has to be perfected.

Re: Forced air ventilated stepped hull?
 

It wouldn't need an airpump, the air would be sucked thru vents located on the deck while moving at speed.

Re: Forced air ventilated stepped hull?
 

"It wouldn't need an airpump, the air would be sucked thru vents located on the deck while moving at speed."

you serious?...physics will not allow this.

EVEN if you had a ducked fan/air pump.....the air is GOING to the path of least resistance....which would be ANY one of the holes exposed to atmosphere and NOT the one under the water where (in your theoretical design) needed.

Re: Forced air ventilated stepped hull?
 

i think i (we) may hold records for a number of unmentionables!LOL

Re: Forced air ventilated stepped hull?
 

I guess you're a physics major then... :rolleyes:

Have you ever stuck your hand over top of the NACA ducts on the deck of an Outerlimits while under way?

If the holes were designed right with the proper leading and following edges, it would indeed suck air.

Re: Forced air ventilated stepped hull?
 

the holes would be desinged like this and the leading edge would be slightly raised (area shaded in black with arrow) which would create a vacuum as the water passes underneath.

That's my summation :rolleyes: