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questions about pusher props.

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Old 08-25-2019, 12:16 PM
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Flight Risk
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Default questions about pusher props.

I have a glow engine I would like to run as a pusher on a flying wing, and have noticed that the selection of pusher / reverse propellers is down from what I used to see.especially in the smaller sizes such as 10-15 inch. There seems to be quite a variety in the big 20-30" sizes, evidently for contra-rotating pattern planes. And there is an abundance of pusher props for electric motors, for obvious reasons, including multi-rotors.
One odd thing I notice is that all of Master Airscrew's pusher props are 3 blades. Why is that? My finding is that 3 (or 4) blade props are much less efficient than 2 blades. I may try one on my wing but wish they were 2 blade. What I need is a 10-11 inch prop with a pitch of 8-10 to allow for ground clearance on a 60 size engine. I did find a 12x9 pusher from Xoar and I cut it down to 11" and will try it in the next few days.
But my main question is what's up with the 3 blade props from Master Airscrew.
And have you found another source of pusher props.

Thanks
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Old 08-26-2019, 03:06 AM
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Appowner
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I don't remember who it was I talked to but at least one of the manufacturers will make a pusher in any size they make a tractor. I'm pretty sure was either Master Airscrew or Xoar and this is for the wood props. They just don't advertise the pushers as much since there isn't a great demand for them.

I'd e-mail both of them and simply ask if they can make a pusher in what ever size(s) you need.
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Old 08-26-2019, 10:33 PM
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Originally Posted by Appowner View Post
I don't remember who it was I talked to but at least one of the manufacturers will make a pusher in any size they make a tractor. I'm pretty sure was either Master Airscrew or Xoar and this is for the wood props. They just don't advertise the pushers as much since there isn't a great demand for them.

I'd e-mail both of them and simply ask if they can make a pusher in what ever size(s) you need.
Thanks Appowner, after doing more searching someone did mention that Xoar could make any current prop into a pusher. I'll try the few old stock I have and see what might be usable;
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Old 08-28-2019, 08:26 AM
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Flight Risk, that's a good handle.
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Old 08-28-2019, 01:22 PM
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my guess with most pushers being 3 blade is if since being is a reversed position there may be a lack of speed? if you were to use a 3 or 4 blade prop there is more speed but the downside is there is also a increase in drag between the prop blade so less efficient. this is just my guess i could be wrong
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