One bladed propeller

Got to fly Gene Breiner's J-2 Cub with Everal one bladed prop on Saturday

http://www.youtube.com/watch?v=fqiBb...ature=youtu.be



http://www.youtube.com/watch?v=fqiBb98o1D8

Very cool! Made me a bit nervous watching the start tho...:eek:

Is there a point to a one-bladed prop? Any advantage?

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Originally Posted by jjhoneck

Is there a point to a one-bladed prop? Any advantage?

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It's supposed to be the most efficient way to make a prop. There are lots of discussions on it but there seems to be no general consensus.

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Originally Posted by Chad Jensen

Very cool! Made me a bit nervous watching the start tho...:eek:

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Genes been around a long time. I too think he was being a little careless. I think it surprised him. Flown in and out of there a good bit. Nice little 2200 foot grass strip. The people are friendly. If every airport could be like it we wouldn't be having the declining pilot population we have now.

I think Gene was just hamming it up a bit when it started, feigning surprise, that was all-



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Originally Posted by jjhoneck

Is there a point to a one-bladed prop? Any advantage?

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Half the chance of a prop strike? :-)

Ron "Somebody had to say it" Wanttaja

There are also some single-bladed props that use a teetering hinge at the hub and and a counterweight to create some constant-speed effect without the complication of a true constant-speed prop. In other words, the prop will automatically seek a coarser pitch in climb and a finer pitch in cruise.
Here's a link to a 1937 article on the Everel prop: http://www.ultraligero.net/Cursos/va...e_una_pala.pdf

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Originally Posted by Downs

It's supposed to be the most efficient way to make a prop. There are lots of discussions on it but there seems to be no general consensus.

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Originally Posted by cluttonfred

There are also some single-bladed props that use a teetering hinge at the hub and and a counterweight to create some constant-speed effect without the complication of a true constant-speed prop. In other words, the prop will automatically seek a coarser pitch in climb and a finer pitch in cruise.
Here's a link to a 1937 article on the Everel prop: http://www.ultraligero.net/Cursos/va...e_una_pala.pdf

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Yeah that is the type of prop on Gene's cub. Pretty nest engineering setup.

He seemed to be pretty surprised it actually started.

Sennsenich had one of these one bladed props hanging on the wall in their Lancaster shop with a story next to it.

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Originally Posted by cluttonfred

...a coarser pitch in climb and a finer pitch in cruise....

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Of course, we all recognize that you meant "a finer pitch in climb and a coarser pitch in cruise." Thanks for the great link!

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Originally Posted by David J. Gall

Of course, we all recognize that you meant "a finer pitch in climb and a coarser pitch in cruise." Thanks for the great link!

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Yup, what he said.

A one blade prop can be mass balanced, but not aerodynamically balanced. I suppose the centrifugal force tends to counteract the aero imbalance some.
One bladed helicopters have flown. Not so good for helicopters, I think.