promarine MTR x2 (twins)

[Flanders]

have a twin motor promarine mtr, and having little stability trouble at higher speeds 6s mostly i doesn't blow over but almost chine walks and then flips. was thinking about changing the prop direction right now they spin outward was going to try spinning them inward. good or bad idea ?

[kfxguy]

I've never tried outwards...I always spin my inwards because it seems to work well on everything it tried it that way.

[T.S.Davis]

I really think those struts are too long for the boat but inward might help. Easy enough to try.

I'm anxious to see just how fast that thing can really run. It's still accelerating when it starts getting weird. I'm predicting many mph in the end.

[T.S.Davis]

BTW What props are on there? We might try something with less lift. Try to keep the boat planted a bit more. It looks high and dry when it starts to speed wobble.

[Flanders]

thanks going try spinning them in hopefully today, let you know. going to wait on props till i try this first

[Flanders]

stock props , and tried a pair of 43mm cnc props

[Darin Jordan]

thanks going try spinning them in hopefully today, let you know. going to wait on props till i try this first

For what it's worth, my Cheetah, which uses the same TFL SSS 3674-2075KV Motors, on 4S, handled way better with them rotating IN as opposed to OUT.

That's the opposite of the conventional wisdom, but that's what works for me. Boat corners on rails too, but not until I shortened the stingers and moved the rudder back.

The MTR-Twin may be OK with the longer stingers, because I think the rudder is also back there behind the props. Mine, originally, had the rudder WAY in front of the props, and it wouldn't corner at all...

[Tamelesstgr]

Excuse my twin setup ignorance, but don't you need to also alter the rotation of the motors and switch the flex cables AND props of you want to run inward instead of outward?

left_and_right_cable-2.jpg

[Darin Jordan]

Excuse my twin setup ignorance, but don't you need to also alter the rotation of the motors and switch the flex cables AND props of you want to run inward instead of outward?

[ATTACH=CONFIG]144934[/ATTACH]

Yes... both the cables and the props need to be swapped. Think of it this way: When you are looking at the cable and the motor is rotating it, will it be acting to TIGHTEN, or to UNWIND, the outer winding? You want it to be tightening.

Also, I know that my TFL Supplied motor collets were Right and Left rotation as well. You want the motor, when turning, to act to TIGHTEN the coupler, not spin it loose. Check those as well.

And, of course, you'll need to reverse the rotation of the motors themselves. Swap any two of the three motor leads to do that.

[T.S.Davis]

The MTR is all TFL gear so I'm sure it was done accordingly.

[Flanders]

Think it will be ok not to switch collets for testing purpose?

[Tamelesstgr]

I wouldn't risk it, if you are taking the time to swap cables and motor wires, what's another 5-10 minutes swapping the collets? Would not be a happy camper if the collet loosened up and you lost two flex cables and propellers.

[Darin Jordan]

Think it will be ok not to switch collets for testing purpose?

YES... for reference, the Pro Boat Zelos Twin doesn't have reversed couplers. They are both the same, standard direction coupler. Haven't heard of any issues with them yet. Just make sure they are snug.

[Flanders]

Flex cant fall out on this one i only say cause its all back together and am about to go test forgot to switch thise

[Flanders]

Just ran it turning in ,ran great no more wierd wobble. One drive cable did come loose retightend and ran some more runs great. Now to switch collets lol. Thanks for the help guys