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Setting up the Electric Thunder Hydros

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Recently Dave Warby asked Dick Crowe for some advice on setting up an Electric Thunder sport hydro hull for 6 cells. The boat had been run with a:

* Trinity 13/5
* Hughey single gearbox 1.8:1
* 6 cells
* Hughey hardware and flex
* Octura x642

The boat had been digging the nose in on start off, cavitating, dragging its tail and didn’t seem to have a great deal of speed.

Dick wrote:

" I ran Electric Thunders about 10 or so years ago. Don't worry about the nose diving under when it starts. Mine does the same thing. If it starts to submerge I stop and try again."

"Those boats had a very flat angle of attack on the sponsons so you really had to run the struts shallow. This hampers low speed performance, but once up to speed it should run good."

" In my opinion I'd run the same motor (13/3) direct drive with a x432 prop. It is still going to cavitate a bunch while getting on step, but once up the extra prop RPM's should help hold the tail up better."

"One thing, don't be afraid to have a bunch of angle in the strut. It's always better to error with too much angle than not enough. I always set mine up with too much then adjust it for the best ride."

"A good starting point for that boat would be to imagine the strut angle as if it were a direct drive not a flex shaft (I'm assuming it has a flex shaft). Then shallow the strut up while keeping the same angle."

"Run the boat and :

* If the tail hops violently -> flatten the strut out a little

* If it slowly rises up and down    -> add more angle

* If it's dragging it's butt -> try to move the Centre of Gravity forward.

"If you can't get it any farther forward add more angle to the strut. You can try all of these things with a gear drive as well."

"One other thing, I don't know where the afterplane break is on your hull but as I remember those boats like the CG about 1-3/4 inches behind the sponson."

Hope this helps, Dick"

After receiving Dicks advice Dave made the changes suggested to the hardware and swapped the motor and prop for a Hughey 8/3 motor and Octura X637.

Did it work?

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