Plane + Engine = propeller

[2ADoc]

Still on subject, but also remember that the downward traveling blade produces more lift than the upward traveling blade.

[Krusty]

Be careful with what you mean by "lift"....

Lift relative to the airfoil of the prop itself? No. That's just pulling it forward. It creates a spiral propwash which adds a bit more flow over one wing than the other, but that's not because the blade is going down as much as the air thrown BACK by the blades all around the airframe.

P.S. Food for thought it also adds more air under the opposite wing, which may even counter-act the extra airflow over the opposite wing. It may be net null results.

[hitech]

Paddle blade
http://www.368thfightergroup.com/sitebuilder/images/w-395-kik-crew-100x150.jpg

Normal Blade
http://www.368thfightergroup.com/sitebuilder/images/w-397-humble-legrove-murphy-150x110.jpg

Basically the end looks like a boat paddle instead of an elliptical shape like a spit wing.

HiTech

[2ADoc]

Ok Hitech I meant that the downward blade produces more thrust, which since it is an airfoil, I related it to lift.

[Stoney]

"What 109 got the paddle shape blade?"

I recall that 109K has bigger blades than earlier versions.

I thought that with paddle blade it is meant just the general shape that was used in 109s and 190s? I.e. the tip is narrower than the base and the base in generally the part that pushes air past the cowling. In P51 and P47 paddle props can be identified as they used "cuffs" to increase and even the airflow around fuselage? Or what is a "paddle prop blade"?

http://www.warbirdinformationexchange.org/phpBB3/viewtopic.php?f=3&t=19774&start=0

-C+

Cuffs were merely for airflow into the engine.  Paddle blade props are characterized by very broad chords.  For an extreme example, look at the older model (i.e. not the KC-130J) C-130 props.  They are very broad chord all the way out to the tips.  Technical term is "high activity factor" propellers. 

[Charge]

Ok.



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-C+

[MK-84]

Would this be an example of why the F4u-1A has a higher top speed but the F4U-D has better acceleration and climb?

[Stoney]

Would this be an example of why the F4u-1A has a higher top speed but the F4U-D has better acceleration and climb?

Not entirely, as the F4U-1D had rocket pylons which slow it down.

[Rob52240]

NERDS!

sorry had to say it.  Thanks for the info as well.
<S>

[Saxman]

Would this be an example of why the F4u-1A has a higher top speed but the F4U-D has better acceleration and climb?

I think you mean the F4U-1. The F4U-1A handles like a late-run example with the paddle prop, and has very similar acceleration and climb to the 1D.