Whalleyb0y's First EDF Jet Boat Conversion

[whalleyb0y]

Whalleyb0y's First EDF Jet Boat Conversion

Yep, all very good input guys. Thanks. Looks like we are all on the same page here with ideas.
I'm going to go look for another Slurpee cup and some brass paper fasteners.

[flraptor07]

CAVSCT's post is the basic idea I was thinking

[whalleyb0y]

How many degrees does the tv nozzle swing in either direction? How much swing would be necessary? Hmmm

[cavsct]

The swamp boat looks to be 15 deg.DSCN0540.jpg Much more and the back end slides out at speed. The research that kind of helped, was for my Recovery boat. We run our boats on a river, very wide most of the time. But there is always a current. The Recovery boat could get to the boat in need, but might take 500 yards to bring it back to safety. Recovery boat is twin motor brushed, straight shaft, and had twin rudders of all sizes. I needed to direct the prop force more efficiently. Powerful Tugs use Kort and Rice nozzles, so that is what I tried. A Kort (straight) nozzle on the Recovery boat. I can now do recovery in a straight line against the current. So when the Swamp boat came along, I went with more of a rice (funnel)nozzle. Then I just tried different servo arms until it handled the way I wanted.DSCN0485.jpgDSCN0489.jpg

[cavsct]

whallybOy- Since you have foamie/EDF experience, could you answer a question on the 40 amp ESCs I have. When they were in the plane, they were wedged into a slit on the underside of the A-10. No air movement and no space. The owner would fly multiple batteries in an outing with maybe 5 min between batteries. The ESCs are double shrink wrapped (one color-one clear) with the small aluminum heat plate. My question is about the normal temps and if cooling these would increase their life. Thought you might have some insight on this. Thanks

[whalleyb0y]

whallybOy- Since you have foamie/EDF experience, could you answer a question on the 40 amp ESCs I have. When they were in the plane, they were wedged into a slit on the underside of the A-10. No air movement and no space. The owner would fly multiple batteries in an outing with maybe 5 min between batteries. The ESCs are double shrink wrapped (one color-one clear) with the small aluminum heat plate. My question is about the normal temps and if cooling these would increase their life. Thought you might have some insight on this. Thanks

Yes esc's in an edf model should always have some airflow. Most edf models are power hungry and the esc's get hot. Castle's can safely run in 160* temps. Surely there is a way to get a little airflow over the esc's?
I've used trimmed plastics spoons as air scoops and cut channels to the esc's for airflow. Then of course you would need exit holes too. The A10 you speak might be a low powered setup and may not get hot enough to be of real concern. But a watt meter and a temp gun would tell you that. Hot setups can still operate but it will only be a matter of time before something fails. And for edf's any kind of failure usually spells certain doom.

[cavsct]

My bad-these are the ones I took from the A-10 parts plane to make my Air/Swamp boat. Just trying to figure how much cooling (air or H2o) they need. And the temp I should be looking for. Thanks for your help.

[whalleyb0y]

My bad-these are the ones I took from the A-10 parts plane to make my Air/Swamp boat. Just trying to figure how much cooling (air or H2o) they need. And the temp I should be looking for. Thanks for your help.

Ah ok, if your heavy on the throttle the esc's will overheat without airflow. I don't know what the temps should be or what the cutoffs might be set for. I would expect them to be warm to the touch during operation but never too hot to touch. Those 6v cooling fans I bought on ebay would be an easy way to provide minimum airflow requirements.

[whalleyb0y]

It took me awhile digging around the house but I eventually found the supplies I was looking for.

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Now I need to figure out some linkage.

[whalleyb0y]

I want the ability to completely revert this boat back to factory condition... You know, in case things didn't work out.

So I grabbed a bit of aluminum sheet and cut out a bracket. I fashioned to align with the same screw holes as the original rudder and linkage.

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[srislash]

Ingenious, two thumbs up

[flraptor07]

That's awsome! exactly what I was thinkin'. I really like the way you used the original rudder pivot as a bellcrank..

[whalleyb0y]

Ok here is a little demo of it on the bench. I only hope there is enough swing to allow for decent cornering.
Its painted, assembled and ready to get wet!

http://www.youtube.com/watch?v=btDkik8IyyM

[gsbuickman]

+1 . its always nice to use existing holes whenever possible rather than drilling new ones, especially when its real creative.....

[tlandauer]

Ok here is a little demo of it on the bench. I only hope there is enough swing to allow for decent cornering.
Its painted, assembled and ready to get wet!


http://www.youtube.com/watch?v=btDkik8IyyM

Fantastic! Can't wait for the video.