Twin Motor Mono Question

[scoota]

went out yesterday with the two loggers and got some results. Not near as big a difference as people might have guessed. I think one has a little more drag in (the blue-port) drive line. I am also amazed at the super low amp draw!!!
Suppo 1600KV outrunners, 4S each motor, 38mm props - top speed: 55mph!!!!!

Good stuff Jesse , this is the stuff i like to read about

[Chilli]

Here are some pics of Carls boat running today. She ran great in the chop. Note the video camera taped on the bow.

[carlcisneros]

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

here is the link (hope this works) of this morning at the lake.
pretty windy conditions out as well.
could only run it at about 1/2 throttle.

45" insane Mono (converted from CMB90)
twin T-600 1400KV outrunners
6s1p 5000mah 40c (times 2)
x-447 cr props.
Twin Sea King 180A ESC's w/2 additional 50v 4700uf caps each.

My first ever video as well.

[sundog]

went out yesterday with the two loggers and got some results. Not near as big a difference as people might have guessed. I think one has a little more drag in (the blue-port) drive line. I am also amazed at the super low amp draw!!!
Suppo 1600KV outrunners, 4S each motor, 38mm props - top speed: 55mph!!!!!

53a draw and 55mph! Yep, there's something going on.

[obrien008]

Hey just checking in on this build, id say go for it man

I think as long as the drives are mounted close together the props should stay in the water I would think?

Def try to keep the props as close as you can, I had a problem with my props hitting and had to install a bar at the end of my struts to keep them away from eachother, ill post a pic to show you what I mean but other than that I didnt seem to have any other problems. Let me know if you have any other concerns or questions and id be happy to help.

[Jesse J]

twin motor data - first of its kind?

went out yesterday with the two loggers and got some results. Not near as big a difference as people might have guessed. I think one has a little more drag in (the blue-port) drive line. I am also amazed at the super low amp draw!!!
Suppo 1600KV outrunners, 4S each motor, 38mm props - top speed: 55mph!!!!!

[fatboyelectric]

Any more progress?


Kevin

[b.mcdaniel.2009]

Anyone else have any thoughts?

[H2OCamel]

It on it's way! Can't wait to see the data.

[b.mcdaniel.2009]

Wowo way over my head LOL.....Going to be innrunner's if I go ahead with this build. Glad you chimmed in Jesse, I know you've built a few twin powered mono's lol.....

[sundog]

[Jesse J]

Hey Chris, if you lent me one, I would then have two and could perform the experiment. pm on its way.

If you have one with 5.5mm bullets, that would be best. thanks!!

[H2OCamel]

Jesse i think I have four eagletree's need to borrow 2? ;-)

[sundog]

Interesting, yes. I have been thinking about that experiment and have some further insight. I have yet to try unplugging the Y connector for the ESCs. I am suspecting that the sympathy was cruising down the Y connection - power from the powered motor to the unpowered one along the radio wire. Still sympathetic, but maybe not related to the magnetic field. I have NOT observed this phenomena with inrunner motors ever! I don't think there will be anything for free, except maybe some "cushioning" - maybe bad on ESCs? probably not, but need data to be sure. Anyone with two Eagle Trees?

I don't think so. Since the motor was disconnected it was totally sympathetic, the esc's weren't involved. The outrunners, having the magnets under the outer spinning can is what I suspect allows/causes this. This is quite an interesting (phenomena) - it'd be nice for someone to build/use this idea - it has merit. Anything that can save amps or give more power for the same amps is always cutting edge!

[Jesse J]

Interesting, yes. I have been thinking about that experiment and have some further insight. I have yet to try unplugging the Y connector for the ESCs. I am suspecting that the sympathy was cruising down the Y connection - power from the powered motor to the unpowered one along the radio wire. Still sympathetic, but maybe not related to the magnetic field. I have NOT observed this phenomena with inrunner motors ever! I don't think there will be anything for free, except maybe some "cushioning" - maybe bad on ESCs? probably not, but need data to be sure. Anyone with two Eagle Trees?