skvp
has any one used twin motors in F-22?
if so which size Prop did you use?
pls provide me with the link for counter rotating prop to be used.

admins please add the link for counter rotating prop in the master part list.

regards
skvp
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F1wanabe
It would be good to know what motors you are using and will you be putting them on the elevons? If so, the clearance between your motor mounts will determine the size of the prop. The Boxermad84 Su37 is about the same dimensions as the f22 and twin 6x4's with mjv3vs work really well. Twin 5. 5 inch props are not worth it if you are using twin mjv3 which are 2200kv motors.
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skvp
I use the motor mentioned in the link below.
http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=12919&aff=46898

and i haven't installed motor mount on the plane.
and this is my first time with twin motors ,
so suggest me distance between motors also.
and any other tips on twin motors are also welcome.

regards
skvp
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F1wanabe
If you are using 6 in props then you will need to mount motors min 6.5 inches apart. You will need to reshape the elevons so prop won't cut them. Look at my t50 v2 with twin props.



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LukeWarm
D2826-6 2200kv Outrunner Motor

Specs:
Rpm/V: 2200kv
Shaft: 3.17mmVoltage: 2S~3S (7.4v to 11.1v)
Weight: 50g
Watts: 342wMax Current: 34AESC: 40A
Suggested Prop: 7x4(2S) ~ 5x5 (3S)

I'd say use two 5x5 Props

The main reasons pusher props exist is because:

    • One reason a reversed(pusher) prop exist is because, if you use two motors, you can completely eliminate torque roll by using a normal prop on one motor and using a reversed prop on the other.
    • The original and biggest reason is, some motors cannot be reversed. If you have this type of motor, you must use a fan or prop that is functional in the direction of their application.
    • On planes with the motor mounted in front of the prop, the pusher prop works better with the available adaptors. But if you do a good job tightening the adapter on a regular prop, it will still work reasonably well. Normal Props are more readily available, so (for us) they are the perferred prop for both applications.


http://www.rcpowers.com/community/threads/a-propeller%E2%80%99s-pitch.13987/#post-153738
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skvp
Thanks ,
can i use the same prop and just reverse one ?
ll that work as counter rotating prop?
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dtribby
While brushless motors can go either way, props are only meant to spin on one direction. You will NEED a counter-rotating prop if you want to counter torque roll. A big enough design may not fly badly without CR props, but it IS one of the best reasons to go with two motors.
Yes, I've known that I'm "different" for some time now...
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skvp
Thanks for the response people....
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