XR propellers are made from imported German Beechwood. Digitally machined (CNC) and hand finished. The XR range of propellers are well balanced and strong yet lightweight. All XR's are primered and lacquered twice to ensure a long life and brilliant smooth gloss finish which helps to reduce friction and noise.
Features; Very high strength/weight ratio. Extended break-point grain alignment. Unique 3D designed efficient curvature. Low noise Accurate balance.
Get the most out of your engine today, get an XR prop!
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
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.
Great prop, using it on my 49" QQ yak with emax motor running 2500mah 4s 750watts. Great thrust and looks flies as good as the 13x6.5 2 blade on it previous.