One bladed propeller

[Andrew King]

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

http://www.youtube.com/watch?v=fqiBb98o1D8&feature=youtu.be




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

[Chad Jensen]

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

[jjhoneck]

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

[Downs]

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

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.

[KDoersom]

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

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.

[Andrew King]

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



-

[rwanttaja]

Is there a point to a one-bladed prop? Any advantage?
Half the chance of a prop strike? :-)

Ron "Somebody had to say it" Wanttaja

[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/varios/helice_de_una_pala.pdf


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.

[KDoersom]

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/varios/helice_de_una_pala.pdf

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

[FlyingRon]

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.

[David J. Gall]

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

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

[cluttonfred]

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

Yup, what he said.

[Bill Berson]

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.