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Old Jul 20, 2014, 07:09 PM
Ft Lauderdale
Number_6's Avatar
Joined Sep 2012
109 Posts
Hi,

Based on my research...and a 'few' bad side arm launches:

Most prop adapters are right hand threaded.

So when a motor is reverse mounted, to be a pusher motor
...and the normal prop (also reversed so embossed lettering faces
forward) is used...it is non-self tightening. If you hit the ground
under power the lock nut loosens and the prop flies off.
Also, if the nut is not torqued on..it may loosen and fly off
in flight...something to think about if you have a lot
of AUD (All Up Dollars).

The same pusher motor (with right hand thread) using a
real pusher prop is self tightening even when windmilling
because the motor rotation is changed...to the left ...
as seen from behind.

Personally, I just check tightening before flight and don't
bother with pusher props.


Edit: I guess if twin motors are used...the counter rotating props
are advantageous ... otherwise for flying wing 'single pusher motors'
the only reason to consider a real pusher prop is the self tightening
aspect.

Myth buster: a tractor prop and a pusher prop (the same prop size/pitch,
by the same company), perform the same...just a self tightening issue
if the adapter is a right hand thread.

Now, if you have a reverse threaded prop adapter on a pusher
motor...then a normal prop would be OK.
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Last edited by Number_6; Jul 20, 2014 at 08:13 PM.
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Old Jul 20, 2014, 08:04 PM
New Beeeeee
RUBNorris's Avatar
United States, CA, Sacramento
Joined Apr 2011
985 Posts
Quote:
Originally Posted by Number_6 View Post
Most prop adapters are right hand threaded.

So when a motor is reverse mounted, to be a pusher motor
...and the normal prop (also reversed so embossed lettering faces
forward) is used...it is non-self tightening. If you hit the ground
under power the lock nut loosens and the prop flies off.
Also, if the nut is not torqued on..it may loosen and fly off
in flight...something to think about if you have a lot
of AUD (All Up Dollars).

The same pusher motor (with right hand thread) using a
real pusher prop is self tightening even when windmilling
because the motor rotation is changed...to the left ...
as seen from behind.

Personally, I just check tightening before flight and don't
bother with pusher props.
Thanks 6! Always take your time while setting up. I forgotten alot of times with smaller planes to check rotation.
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Old Jul 20, 2014, 08:24 PM
Registered User
Joined Jan 2012
30 Posts
Quote:
Originally Posted by Number_6 View Post
Hi,

Based on my research...and a 'few' bad side arm launches:

Most prop adapters are right hand threaded.

So when a motor is reverse mounted, to be a pusher motor
...and the normal prop (also reversed so embossed lettering faces
forward) is used...it is non-self tightening. If you hit the ground
under power the lock nut loosens and the prop flies off.
Also, if the nut is not torqued on..it may loosen and fly off
in flight...something to think about if you have a lot
of AUD (All Up Dollars).

The same pusher motor (with right hand thread) using a
real pusher prop is self tightening even when windmilling
because the motor rotation is changed...to the left ...
as seen from behind.

Personally, I just check tightening before flight and don't
bother with pusher props.


Edit: I guess if twin motors are used...the counter rotating props
are advantageous ... otherwise for flying wing 'single pusher motors'
the only reason to consider a real pusher prop is the self tightening
aspect.

Myth buster: a tractor prop and a pusher prop (the same prop size/pitch,
by the same company), perform the same...just a self tightening issue
if the adapter is a right hand thread.

Now, if you have a reverse threaded prop adapter on a pusher
motor...then a normal prop would be OK.
Thanks so much for the detailed reply. I think I will also go with a normal rotation prop and just make sure that I torque down on it every time I go to fly. I'll get some lock tight on the nut as well.
Thanks
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Old Jul 20, 2014, 08:46 PM
Ft Lauderdale
Number_6's Avatar
Joined Sep 2012
109 Posts
Ya man.

I also just torque regular prop down before flight
as part of preflight check.

Pusher props aren't always available at LHS
and I don't bother setting up a plane with them.

>>>>Rub...that is awesome!!!
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Old Jul 20, 2014, 08:57 PM
Registered User
United States, CA, Elk Grove
Joined Jun 2013
370 Posts
Same here, just torque down and not worry, minimal loss of prop or adapters. And pass on prop savers
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Old Yesterday, 08:20 PM
Registered User
Joined Feb 2013
69 Posts
We had the NEFPV Feat Meet this past weekend. It was an incredible meet up.. Three Juggernauts flying.. Although, by the time we did the race below, only one was still in flying condition (mine). Everyone has to see or race in one of these events. What a blast. Unfortunately, my Jugg (in middle position) climbed way too high right out of the gate (it just wants to be in the clouds) and I was behind right away. Crashed in the fourth lap. 3 out of 5 wings finished.

Thanks so much to Sweepwings and SierraRC for sponsoring the event and providing a Juggernaut as a prize!!

NEFPV Feat Meet - 5 Wing 10 lap Short Course Race (3 min 52 sec)
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Old Yesterday, 10:50 PM
New Beeeeee
RUBNorris's Avatar
United States, CA, Sacramento
Joined Apr 2011
985 Posts
Quote:
Originally Posted by appelm View Post
We had the NEFPV Feat Meet this past weekend. It was an incredible meet up.. Three Juggernauts flying.. Although, by the time we did the race below, only one was still in flying condition (mine). Everyone has to see or race in one of these events. What a blast. Unfortunately, my Jugg (in middle position) climbed way too high right out of the gate (it just wants to be in the clouds) and I was behind right away. Crashed in the fourth lap. 3 out of 5 wings finished.

Thanks so much to Sweepwings and SierraRC for sponsoring the event and providing a Juggernaut as a prize!!

http://www.youtube.com/watch?v=IgYkKnfIQlM
Awesome! Man, I'd love to go to a FPV event like that. Pure fun. I watched some of Yuvski video, lol mini quads look fast! Lucky guys! The Jugg race. Lol sweet!
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