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Apr 14, 2017, 01:28 AM
Registered User

Multi-rotor motors for pusher jets.

I find that multi-rotors now comes out with weird rotors such as

4 x 4 with 3 to 4 blades.

And they do have motors that claim to deliver up to 700g++ of thrust.

Can rear pusher jets use 3 to 4 bladed multi-rotor props and multirotor motors?

What motor kv should I be looking for a 4x4 or 4x4.5 , 4 bladed props ?

I know 8x4.5 props are used on 1200kv motors, but using the same motor, can i use a 4x4.5 prop with 4 blades on the same motor ?
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Jun 06, 2017, 07:35 AM
Registered User
700g?? No way, with newer curved magnets and tigther tolerances they are pushing more like 1.7kg with 4s. Absolutely you can use then the motor and prop does not know whether they are mounted on a multi or a wing. Search for Reptile S800, that wing is designed for using multi components.
Jun 07, 2017, 07:42 AM
Isaiah 40:31
Clickety's Avatar
Yeah, I used a couple of quad motors on my A-10 design - It flies really well - lots of thrust!
Oct 21, 2017, 02:28 PM
Registered User
I used 2 DYS Thor 2700kv motors with 3 blade 4045 props on a 3300 4S lipo in my scratch built 60" A-10 and it flies like a dream! It also flies on 3S but with a bit less authority. Here's a link to the flight video:
Mike Pastro's A 10 Warthog (3 min 6 sec)
Oct 21, 2017, 06:00 PM
Registered User
dgarbern's Avatar
The sound of those props isn't too bad either. Have you taken any thrust readings?
Oct 21, 2017, 06:31 PM
Registered User
I agree. They actually have a similar sound to the real A-10's high bypass turbofans!

With the motors installed and the model pulling a digital scale, total thrust was 1.95kg using a Zippy 40C 4S lipo. It drew 79 total amps. I'm using Turnigy Plush 40A ESC's. The aircraft weighs approx 2.2 kg so performance is good. FYI, these motors can actually run on 6S so you could probably get more thrust if you used different props and ESC's.

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