Rigger design

[Slideblues]

Design is from Japan, Was posted a while back, Larry "Fast Rat" at Jims RC Boatdock is doin a gas version,

Wondered if anyone stateside had thought about doin a nitro version,

Gene

 

[davo]

wats the go with that?

 

[Ron Olson]

The "Rocky Left Hook" was a pretty successful design albeit different. The prop isn't at the back, instead under the pipe. It is supposed to be blow-off proof!

It would be cool to get the schematics on it.

 

[Slideblues]

Yeah I thought the design was inovative, and the blow off proof was a plus, If I remember right it turned very well in the chop with no tail hop either,

Gene

 

[Mark]

Guys, can anyone tell me why they didn't become popular if they handle well?

 

[rhomodel]

May be because it was not fast? I dunno just guessing. May be nobody saw a market in them, there not that many rigger manufacturers ( at least not when compared to mono's and cat"s)

Julius

 

[Ian Inverarity]

Gene,

I wonder about the CG of such a design? I started to draw one up a while ago, but I was hoping to get the prop on the CG. But when I actually started to draw it up I could not see how that was possible.

The reason why I think the prop should be on the CG is the prop lift would be at the CG, and thus should not cause the prop to blow out of the water (has to lift whole boat), and if the trun fin is close to the CG as well, then the prop walk would be trying to drag the turn fin sideways thru the water, which it might do a bit but should not cause the yawing that conventional riggers get from prop walk. Thus it could eliminate the prop from the handling equation and yoiu could just run the fastest prop designs...

If the prop is behind the turn fin and CG, then the advantage of this layout would be reduced. It may be better on the aspects above, but wont have eliminated them.

If the prop could be at the CG and in line with the fin then I think the layout could be great for a twin! B) Instead of a left hook it could be symmetrical with props either side of a thin section which runs to the back and rear sponson and rudder.

Another issue is that the rooster-tail would hit the pipe, which is not good for drag... :huh:

Nitrocrazed racing: Always looking for a better idea!

 

[Don Templeton]

I think I'll let Japan keep that one! :wacko:

I'll bet Hammer could fill us in.

Don

 

[Lake S.P.O.R.T.]

Maybe the guy was drunk when he built the tub and when he sobered up he thought.....why not.

 

[Slideblues]

Hey Guy's

Ian good to hear from you, I just put up a post asking whats goin on in Oz.

Far as the left hook design, I dont know much other than what has been said. Seems everything the boat clubs do in Japan is different from over here, the designs must work and work well as they run in pretty choppy water. Might take a combo of ideas and some experimenting to come up with something new, The idea got me thinkin anyhow,

Gene

 

[Preston_Hall]

Gene,
I wonder about the CG of such a design? I started to draw one up a while ago, but I was hoping to get the prop on the CG. But when I actually started to draw it up I could not see how that was possible.

The reason why I think the prop should be on the CG is the prop lift would be at the CG, and thus should not cause the prop to blow out of the water (has to lift whole boat), and if the trun fin is close to the CG as well, then the prop walk would be trying to drag the turn fin sideways thru the water, which it might do a bit but should not cause the yawing that conventional riggers get from prop walk. Thus it could eliminate the prop from the handling equation and yoiu could just run the fastest prop designs...

If the prop is behind the turn fin and CG, then the advantage of this layout would be reduced. It may be better on the aspects above, but wont have eliminated them.

If the prop could be at the CG and in line with the fin then I think the layout could be great for a twin! B) Instead of a left hook it could be symmetrical with props either side of a thin section which runs to the back and rear sponson and rudder.

Another issue is that the rooster-tail would hit the pipe, which is not good for drag... :huh:

Nitrocrazed racing: Always looking for a better idea!

If the prop was located at the CG then yes it wouldn't have as great a tendency to blow out but it would have to do more lifting. Wouldn't that be sacrificing energy that could be used for forward momentum? Also, I would think the prop needs to always be aft of the CG to prevent see-sawing.

 

[EatMyShortsRacing]

I would have thought that it was blow-over-proof because as soon as the front has lifted by a reasonable amount the prop is out of the water stopping the drive with the rudder and presumably rear sponson still in the water at the rear dragging the nose down again...

EMS Racing Elementary my dear Watson

 

[EatMyShortsRacing]

Ian now if you really wanna get special with a twin version lets lay the engines on their side with the heads facing each other so the centre section has both pipes over it with the props out to each side....

EMS Racing Now how do we change the plugs???