Push and normal propellers

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I am building a B17 78" WS and I will use 4 brushless motors with 3 blade propellers. I heard about push and normal 3 blade propellers and would like to know if in a 4 motor plain I should use the 2 kinds of propellers, why should I have to use and where should the push ones be installed (inside or outside motor)

Your help would be aprreciate

Thanks

Sacramento

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Sacramento Members Profile Send Private Message Find Members Posts Add to Buddy List Platinum (PT) USERID: 1073022 Newbie Joined: 21/Sep/2011 Online Status: Offline Posts: 2	Quote Reply Topic: Push and normal propellers Posted: 30/Apr/2012 at 4:10am
	I am building a B17 78" WS and I will use 4 brushless motors with 3 blade propellers. I heard about push and normal 3 blade propellers and would like to know if in a 4 motor plain I should use the 2 kinds of propellers, why should I have to use and where should the push ones be installed (inside or outside motor) Your help would be aprreciate Thanks Sacramento

Sooty Members Profile Send Private Message Find Members Posts Add to Buddy List Platinum (NZ) USERID: 173750 Hobbyking Addict Joined: 10/Mar/2009 Location: Christchurch NZ Online Status: Offline Posts: 2587	Quote Reply Posted: 30/Apr/2012 at 4:25am
	You can eliminate torque by using props rotating different directions on each side - providing you can get matching props for cw & ccw when you order them. Any prop can push or pull - it still mounts facing the same direction in front of or behind the motor - unless you need to fly your plane backwards. It all comes down to the motors used. Will the shaft bearings take push instead of pull?
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Daithi Members Profile Send Private Message Find Members Posts Add to Buddy List Platinum (GB) USERID: 1241240 Hobbyking Addict Joined: 06/Jan/2012 Location: Belfast,Ireland Online Status: Offline Posts: 2625	Quote Reply Posted: 30/Apr/2012 at 5:00am
	Actually in that setup Sooty, they're all pulling (the two inboard motors rotate one way with the normal prop and the outboard ones in the opposte way with the 'pusher' prop) That counteracts the torque of four motors all trying to pull everything to the left. All Sacramento has to do is make sure that the two inboards and two outboards rotate in the opposite direction (obviously making sure he has the correct prop on each of course )
	I don't care what it says on the profile - I'm so NOT GB!

Sacramento Members Profile Send Private Message Find Members Posts Add to Buddy List Platinum (PT) USERID: 1073022 Newbie Joined: 21/Sep/2011 Online Status: Offline Posts: 2	Quote Reply Posted: 01/May/2012 at 5:21am
	Thank you for explanation. Now I understand the reason. But that way the motor should be mounted reversed so it rotates in the other derection, correct?

Daithi Members Profile Send Private Message Find Members Posts Add to Buddy List Platinum (GB) USERID: 1241240 Hobbyking Addict Joined: 06/Jan/2012 Location: Belfast,Ireland Online Status: Offline Posts: 2625	Quote Reply Posted: 01/May/2012 at 5:43am
	No - swap two of the leads to the motor (any two) and it will run in the opposite rotation
	I don't care what it says on the profile - I'm so NOT GB!