33'' mono twin setup

[Nevs]

if money matters you could get aprox. the same power by using these. https://hobbyking.com/en_us/rotorsta...size-heli.html
And they are not 14 pole, but 6. I know the "new" T-180 works perfect with at least up to 8-pole.

[Sheffield]

Well, I never used outrunner motors, the guy sells the 2 Scorpion 3026 - 1900kv for 100 us£ , they are new in the box, never used.
Or I saw those 3650, same size than the Scorpion :



Did you look at Dr Mad Thrust 2970 / 2200kv inrunner motors ? I had one in my hands magnets are very strong but 2200kv ...



Nevs, the Rotorstar 1600kv look strong too, thanks for help guys.

[ray schrauwen]

YOu can get just as good for about $50-$60 US Suppo motors.

http://www.altitudehobbies.com/suppo-motors/suppo-h-series-heli/suppo-h3126-3-2200kv-brushless-helicopter-motor-500-class

[ray schrauwen]

Scorpions are a good deal.

[Sheffield]

Those SUPPO motors look great , I didn' t know them. I add the link in my favorites.

I think I will buy the NOS Scorpion 3026 1900kv.

[Rcsurfrider]

Ive been using heli motors in my Rc jetboat using 28mm kmb drive. Tiny little motors 12pole 2836 with 700 watts and gobs of torque. I can jump it out of the water to clear rocks going upstream. My other jet boat uses a 3656 in runner . I really like how the outrunner boat motor handles better. I use a high pwm 60a heli esc with it, the esc has an added water cooling plate and it is fully water proofed. So I can run 80A continuous through it now and it stays cool:) The heli esc/ motor seems to give better throttle control compared to my inrunner setup, especially when river crawling.
Im a big fan of outrunners as they are torquey has hell and self cool needing only a water cooled motor mount, which is standard for me.

[RunningBeer]

Hi Sheffield, have a look at the photo galleries on my page, I've built a twin pursuit and a twin pirate. I also don't think 29mm motors will disapate enough heat for you. My pursuit had 2x HET 2200KV 3668's on 4S. The boat was a bit wild, there's a lot to learn about twins (like all boats).RB

[Sheffield]

Hi Sheffield, have a look at the photo galleries on my page, I've built a twin pursuit and a twin pirate. I also don't think 29mm motors will disapate enough heat for you. My pursuit had 2x HET 2200KV 3668's on 4S. The boat was a bit wild, there's a lot to learn about twins (like all boats).RB

Thanks, pictures help me a lot, I will install the blade behind the propellers and motors low as possible.

[Sheffield]

I will use flex shafts with 3/16'' prop shaft .
Which one should you use ? 4mm flex shaft with 3/16'' prop shaft or 3/16'' flex shaft with 3/16'' prop shaft ? Thanks.

[RunningBeer]

I'm a 3/16 man myself. I guess it kinda matters what you have in the ol' prop box.

[Sheffield]

I made a motor mount for two Scorpion 3026 1900kv, the two parts are strongly glued using threated shafts in the holes + epoxy . It is strong enough.

Picture with the modified TFL rudder, motors will be low a possible in the hull .

[Nevs]

It looks great..And the shafts between the 2 mounts is another great idea..I have done this a couple of times but used a 1 piece 3mm aluplate...Your mount will be lighter..

[ray schrauwen]

You can only get one threaded shaft between those mounts to join them no?

I've seen it done before but not sure how it was done???

[CraigP]

Nice, very close mounting! Have you thought about a small carbon fiber piece going from the point of the joint to the hull? That would triangulate that mount nicely! Could be epoxy attached the the motor mount I believe...

[Sheffield]

What do you think about those stingers ? I will order 2 stingers for 3/16"" shafts, any suggestion is welcome

http://www.ebay.com/itm/adjustable-stinger-drive-for-3-16-4-76mm-flex-cable-rc-boat-75-100mm/151660578098?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649