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All Forums >> Electric Aircraft Universe >> Electric General Discussion >> need help wit pusher motor thrust set up
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need help wit pusher motor thrust set up - 1/26/2013 6:55 PM   
suzonka


 

Posts: 786
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Last Login: 5/14/2013
From: calverton Long Island, NY, USA
Status: offline 		I want to make a plane mid wing type and install 2 pusher motors electric on the trailing edge of the wing as close to the fuselage as possible , now I know they mount puller type leading edge wing type set ups with the right motor having left thrust and the left motor having right thrust , so if one motor dies the plane will have a chance to track more straight, but how would you do this with a pusher twin set up at tail from the back looking forward the right motor facing out like right thrust ? [image][/image]

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RE: need help wit pusher motor thrust set up - 1/26/2013 7:28 PM   
cubaneight


 

Posts: 106
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Joined: 5/1/2004
Last Login: 5/16/2013
From: Colchester, UNITED KINGDOM
Status: offline 		You're worrying unnecessarily. With twins, sidethrust, whether the motors are tractor or pusher is going to provide little or no help in a single engine out situation. Correct application of rudder into the good engine is the correct method of correcting unwanted yaw. Better still, shut down the remaining motor and land dead stick.
Mount your motors with no side thrust (they may need a bit of up thrust -thrust vectored down- to correct any nose up tendency at full power) and with the reliability of an electric setup you'll have no problems. Be prepared though to retrim slightly in the roll axis to counteract for motor/prop torque. You could go for motors with opposing rotation, but personally I wouldn't bother.
One thing I've found with pushers is that a lot of prop noise is generated if the prop tips are running very close to to the plane's trailing edge - keep this distance as large as is practical to keep the noise down.

Hope this helps.

< Message edited by cubaneight -- 1/26/2013 10:47 PM >

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