LGK:s Propcalculators:

Use it on your own risc.

Performance:

How high in RPM can your prop go without coming over Mach in tip speed?

Compensation for outside temp in Celsius. Speed in Mph.

* = INPUTS

* Prop Diameter. In inch.

* Engine Rpm. ( Max )

* Engine Gear. Example. 2,58:1 set 2.58, with no gear use 1.

= Prop Tip Speed in Mph.

* Outside Temp. in Celsius ( Normal 20° C. )

= The Speed of sound in Mph. Calculated with outside temp.

= Prop Tip Speed in Mach. Best performance between 0,8-0,92 Mach.

A propeller dont work just under and over Mach speed.
Just under Mach the prop vibrates and sounds very much and have bad efficiency .

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What speed can you get with your prop:

Only calculated.

* = INPUTS

* Prop Pitch. Measured at 75% of the prop disk radius. (Use right "GO"-button for input. I.e. inch=40, metric=1.016m)

* Engine Rpm. (In cruise or test)

* Engine Gear. (No gear =1)

* Aircraft drag. 85 to 75%. If the aircraft is very aerodynamically clean use 0.85 . Default id 75% (0.75)

= Speed in Km.

= Speed in Mph.

= Speed in Knot.

 

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LGK 2007