Shouldn't be any worse than any other prop.

Originally Posted by ericb

Shouldn't be any worse than any other prop.

Agreed. The shape might be a little scary but you should never have ANYTHING enter the prop arc, no matter what prop it is or on what model.

The shape has been tried before in models going back to the late 60's. NASA has done extensive research on swept blade designs. In model applications I have not seen "measurable" performance improvements over a standard well designed prop. I hope this time around there is a measurable performance increase in one or more aspects.

In my experience props with a swept blade shape can inflict more damage when they strike your hand/fingers. It has happened to me in the past. The blades strike at a glancing sweeping angle resulting in a slicing action. Compared to a more blunt strike from a 90 degree fixed blade. Be careful not to get your fingers hung on the tailing edge of the prop which tends to hook your fingers and hold them on the prop. I found it takes a different style to swing swept blade props safely and "always" wear a very protective glove that can not be sliced through by the prop starting or in a backfire situation.

Just my experiences with previous curved leading edge props. Be safe and have fun.

Looks good for mowing down the weeds and overbrush.

i want to hear the sound of it plus

Originally Posted by David H

............
In my experience props with a swept blade shape can inflict more damage when they strike your hand/fingers. It has happened to me in the past. The blades strike at a glancing sweeping angle resulting in a slicing action. Compared to a more blunt strike from a 90 degree fixed blade. Be careful not to get your fingers hung on the tailing edge of the prop which tends to hook your fingers and hold them on the prop. I found it takes a different style to swing swept blade props safely and "always" wear a very protective glove that can not be sliced through by the prop starting or in a backfire situation.

Just my experiences with previous curved leading edge props. Be safe and have fun.

The forward sweep of this design would tend to allow your hand to slide off the blade easier when propping it, not the other way around. Will definitely be interesting to see how these things work in the real world.

Earle

O YEAHH looking forward to this one!

Originally Posted by David H

The shape has been tried before in models going back to the late 60's. NASA has done extensive research on swept blade designs. In model applications I have not seen "measurable" performance improvements over a standard well designed prop. I hope this time around there is a measurable performance increase in one or more aspects.

In my experience props with a swept blade shape can inflict more damage when they strike your hand/fingers. It has happened to me in the past. The blades strike at a glancing sweeping angle resulting in a slicing action. Compared to a more blunt strike from a 90 degree fixed blade. Be careful not to get your fingers hung on the tailing edge of the prop which tends to hook your fingers and hold them on the prop. I found it takes a different style to swing swept blade props safely and "always" wear a very protective glove that can not be sliced through by the prop starting or in a backfire situation.

Just my experiences with previous curved leading edge props. Be safe and have fun.

I don't think you quite get it the prop is the opposite of a tradional swept blade the blade sweeps into the direction of roration not back from the direction of rotation and without todays modern materials I don't believe this could have been accomplished!

Was the designer trying to promote spanwise flow TOWARDS the root of the prop??

Will there be any video and data released relating to this prop?

I am wondering two things:

1) Could this basic design concept be used on heli's for the main rotor blades or mabe just tail rotor blades?

2) How long before the guys in China copy the design and come out with their own version?

Interesting concept looking forward to more reviews soon as they are available count on my order

DO a Google search on "forward swept propellers" and you'll get a bunch of hits. Lots of technical papers out there. I wonder why if this design is so radical and efficient it has not been picked up by full scale? There certainly has been a good deal of research done.

Originally Posted by Jkoch713

This might come in handy....or fingy... Depends on how you look at things..
YouTube - Smarter Starter

Stands to reason Pattern Fliers

Originally Posted by Judge

DO a Google search on "forward swept propellers" and you'll get a bunch of hits. Lots of technical papers out there. I wonder why if this design is so radical and efficient it has not been picked up by full scale? There certainly has been a good deal of research done.

Because most full size props are Constant speed.... (or variable pitch).... this design blade would likely require huge counterbalances to be "Twist Neutral"... but a bigger issue is that it is structurally divergent... increased bending results in increased AOA.. thus tending to bend more, twist more, bend more, twist more, bend more.......... not a flutter friendly environment....

possibly with clever fiber directions, the twist can be made benign ...... hmmmm???