RCU Forums - WHAT 3-BLADE PROP EQUALS 15X8 2-BLADE?

RCU Forums (https://www.rcuniverse.com/forum/)

- Extreme Speed Prop Planes (https://www.rcuniverse.com/forum/extreme-speed-prop-planes-104/)

- - WHAT 3-BLADE PROP EQUALS 15X8 2-BLADE? (https://www.rcuniverse.com/forum/extreme-speed-prop-planes-104/5966768-what-3-blade-prop-equals-15x8-2-blade.html)

airbusdrvr

06-09-2007 08:17 PM

WHAT 3-BLADE PROP EQUALS 15X8 2-BLADE?

How does one convert from a known two-blade size to a three-blade? If I wish to change from a 15X8(Master Airscrew black) two blade, what 3-blade size would I use? Will there be a performance loss/gain going from two to three blades? I'm interested in maintaining better performance in the higher speed range. The aplication is a Bruce Tharpe Engineering Delta Vortex using an OS 91 FX.

Mike Connor

06-09-2007 11:20 PM

RE: WHAT 3-BLADE PROP EQUALS 15X8 2-BLADE?

A 15 x 5, 14 x 7 or 13 x 9 three blade prop would have a similar load factor according to the ThrustHP program. I have heard many say that the two blade is the best for performance but if you need ground clearance the three blade may help.

Trollmaster

06-10-2007 06:53 AM

RE: WHAT 3-BLADE PROP EQUALS 15X8 2-BLADE?

Quote:

ORIGINAL: airbusdrvr

How does one convert from a known two-blade size to a three-blade? If I wish to change from a 15X8(Master Airscrew black) two blade, what 3-blade size would I use? Will there be a performance loss/gain going from two to three blades? I'm interested in maintaining better performance in the higher speed range. The aplication is a Bruce Tharpe Engineering Delta Vortex using an OS 91 FX.

This has come up a zillion times, the overall consensus is the 3 and 4 bladed props do not bring out the performance as a 2 blade-but they do look good.

All times are GMT -8. The time now is 09:30 PM.