Pusher verses tractor propeller

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Dusan

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Sep 15, 2014
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Are you saying that power-on and power-off are only relevant if the propeller is up front?
No, and side forces are probably more relevant to a back mounted propeller as it is more distanced from the CG so it has more arm, the moment created is larger.
 

Vigilant1

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IMO, both uses of the term "pusher prop" are appropriate. Luckily, it is normally very clear from the context what is being discussed. If the discussion is about the location and adequacy of the thrust bearing in the engine, it is obvious what we mean by a "pusher" or "tractor" prop, and that this doesn't have anything to do with location on the thrust disc relative to the acft CG.
But, in general, planes with props that "push" on the crankshaft also have props located aft of the CG and which "push" the aircraft along. So, this encourages a certain laziness and ambiguity in common speech when we use the term "tractor" and 'pusher'.
 

jedi

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Sahuarita Arizona, Renton Washington, USA
Avoid the confusion by stating what you are talking about.

A pusher engine has the prop behind the engine. A tractor engine has the propeller in front of the engine. A helicopter has the propeller on top of the engine.

A tractor airplane has the propeller at the front of the airplane (forward of the CG). A pusher airplane has the propeller at the tail end of the airplane (behind the CG) unless the aircraft is tailless. A tailless aircraft would be a pusher if the propeller is behind the MAC.

Jet aircraft do not have propellers. Jets both suck and blow. That is why they are so popular. You get two for one. They have a sucking tractor at the front of the engine and a blowing exhaust at the back of the engine. They also cost twice as much as you can't get nothing for nothin in aviation.
 

rotax618

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Oct 31, 2005
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Evans Head Australia
Pushers can have the propellers on top of, behind, underneath the wing as with many amphibians, pod and boom pushers etc. —— We all know what is being referred to, semantics and oddities excepted.
 
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