Help! twin motors

[chickenhawk]

How important on a twin motor set up to have one motor turn one way and the other turn the other? Grandson glued every thing up and we discovered both motors are turning the same direction. And every thing is where cant get to it.

 

[Mr Man]

How important on a twin motor set up to have one motor turn one way and the other turn the other? Grandson glued every thing up and we discovered both motors are turning the same direction. And every thing is where cant get to it.

Depends on plane and power system. If you give us this info I’m sure we can help!

 

[chickenhawk]

2217 with 40 amp esc 10x6 props low wing self design. 60 inch span 3s

 

[Mr Man]

2217 with 40 amp esc 10x6 props low wing self design. 60 inch span 3s

You might be fine if go down to a 9x6, but I’d still recommend having reverse rotation on one.

 

[Mr Man]

I’ve had to do this before. What I do is cut a small square by the wires, fix it. And then glue that square back on.

 

[quorneng]

chickenhawk
When you have built as many models as I have and all of them with everything "built in" cutting a hole, fixing the problem and then making good again is considered entirely normal.

The need for counter rotating props depends upon the maximum torque (prop size) compared to the size and weight of the plane. The same motor/props in a small light plane will make it harder to control without counter rotating props, particularly if you apply full power when flying slowly.
I presume you have CW and CCW props available.
What kV are your motors?
10" props are only recommended for the 950kV and 1100kV versions of the 2217 and then only with a 3s LiPo. Higher kV versions need smaller props. Put a too big a prop on a higher kV version and it will burn out!
If you do have either the 950kV or 1100kV versions be aware they are apparently only rated for a max of15A for 20 seconds!
A Watt meter is a useful tool so you can measure the full power amps to see how close your prop selection is to the motor amp limit.

 

[Shurik-1960]

10 years ago, I built a large model with two motors that had a tilt to the right of about 4-5 degrees: I added the same number of washers under the foot of the motor and started it. The model flies to the left- I increase the deflection of both engines to the right. Experimentally, with washers, it is easy to achieve a straight flight.Now they install 2 differently rotating motors: the mounting threads are left and right. If the mounting thread is the same, the nut can be unscrewed in flight: you need to install 2 nuts.

 

[Houndpup Rc]

the nut can be unscrewed in flight: you need to install 2 nuts.

Or a locking nut...I just put a drop of hot glue on the threads and crank her up tight and that is good enough.