XR Type D Beechwood 3-blade Sport Propeller 12x5

adrien  5 points - 3/3/2013

I think is it a little bit expansive compared to the other propellers, is it an error ?

BeaoSpitfire  1 points - 2/22/2012

Can it be used in glow engines?

jorgerocha  5 points - 4/1/2011

This prop is in backorder for too long. There is any similar in HK?

nihil  173 points - 7/24/2009

Lutero,
...yet.
Forget about it.
Go to MicroDan site and You will find for consultation one softer for thrust calculation vs rpm.
In this program you can find a lot of porps and it warn You when You are turning a prop too hard.
I already shift from GWS ( fine prop for lower power) to APC E in more powerfull motors.
Batery laden = full tank...with no mess.
Lutero

nihil  173 points -

Lutero Bueno
I am concerned about tip speeds for props.
There has one simple formula,well, not properly, that give us an idea about tip speed and safety of propellers, it is:
N x D.
N = rpm and D is the diameter in inches.
IT IS RESPOMSABILITY OF THE PROP MAKER to make the prop safe to use limited by certan parameters. Which parameters?
The maker should inform the users the limitation for using their products.
Thing like that: THIS PROP IS GUARANTID TO RUN UP TO 'ND' OF 150,000.
This mean that a prop, say, 10" should not be operated above15,000 rpm.
I would like to see this note in a prop I buy,
Thing about.