I have 3 different propellers to test;
Lang LA10 66" diameter 28" pitch
Flottorp 6628 66" diameter 28" pitch
Sovereign Z5930 63" diameter 31" pitch
00:00 Intro and getting ready
00:45 Running through the propellors
02:51 Static Thrust measuring set up
06:39 First startup
09:19 First run with Lang LA10
10:07 Second run with Lang LA10
11:04 Changing the Propellor
12:41 Second Startup
14:10 First run with Sovereign Z5930
15:03 Second run with Sovereign Z5930
16:08 Cool down and debrief
18:44 Outro and clear up
My guess of 200 pounds was based on an old formula I found a while ago. Turns out it was fairly accurate! Static RPM and thrust are only a rough indication for a suitable propeller; the prop will unload as airspeed increases which is why the Sovereign prop coarser than the Lang was so good in flight (allegedly).
A shame the Flottorp didn't fit, I shall give it back the the owner as it's just on loan.
Music: 'Hammock Fight' by Kevin McLeod Copyright Free
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