Problems With a 4S Setup

[CraigP]

I blew it getting that 2310kv motor... That’s a big motor you got in there Larry! Thanks for sharing that info.

[Fluid]

BTW, I’m also starting on another Vortex33 that will have twin 3650’s in it with a single center mount rudder. Ive always wanted to build a twin and I really enjoy driving the hydros. No class for it, but plenty to learn from! I was thinking of documenting the build on the site, just take my time. Looking to make it as light as possible...

Actually, NAMBA Sport Hydro rules state that the drive train is up to the racer. P Power rules allow twin motors. But I’d clear it with your local club first. I had contemplated doing this with my Vortex when I first bought it, there’s plenty of room in the hull. Just try spinning both props in the same direction for oval racing, the twin rigger guys all run em that way for improved turning. Lots more prop options that way too.


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[CraigP]

Good stuff Jay, thanks! I got small motors, 3650’s going in. I did a calculated weigh up and this combo should get me to 10.5lbs, lighter than the 8S boat. It’s a 4S boat, 2090kv

What direction do they turn them, CCW?

[TRUCKPULL]

Yes - CCW.

Twins are legal in "P" for NAMBA but not IMPBA
IMPBA only allows twins in "Q" and above.

Larry

[Fluid]

Actually, IMPBA specifies that all Sport Hydros can only use one motor. F.2a in the current book.



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[CraigP]

I’m sure there would be some “discussion” if I showed up with this boat! But it’s just two, tiny motors, lol!

[Fluid]

Twin R/C sport hydros are very rare. This is the only one I’ve seen, and it’s an 18” NQD. They didn’t get the memo on prop rotation.....but then again it’s not an oval racer.

88D51870-79B6-4E7E-AB8B-9F8A8A57858D.jpeg

[TRUCKPULL]

Actually, IMPBA specifies that all Sport Hydros can only use one motor. F.2a in the current book.

Sorry Jay you are correct. I was thinking about my twin Cat.

Larry