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Hi Pete,
I made the switch you described..my Aymar-Demuth prop was stamped 68-78 but
apparently it was cut down to 62" since that was its actual measurement. I
did have a suitable crank so I went with the MT hydraulic version (3 blade)
which was lighter than the electric. Since my A-D prop could be
turned 2900 (maybe more but I would pull it back) any numbers for comparison are
meaningless. The max RPM on the MT is 2650. I could adjust the stop
but have not.
In my case, I was more interested in slowing the aircraft for landing on my
2300 ft sod strip than the max speed. The 'air brake' out front now allows
much more margin creating a safer situation.
The good news (at least in my installation) was no mods were required to
install the MT. I just unbolted the A-D and installed the MT. Their
nose cone fit perfectly. My governor is installed in front (near the prop)
which as supplied by MT is a very small and light unit. No changes were
required to remain in the allowed W & B.
With the new style nose strut pumped up properly, I believe I could have
used a 63" diameter but it would be marginal.
Earl E Schroeder Cessna N3595J Lancair N233EE
5436 St Phillips Rd
S
Evansville, IN 47712
812 985-3372
Anyone have some actual data as to the performance increases
realized by switching from fixed-pitch to a constant-speed? I have
a L-235/320 with 62X76 Aymar-Demuth fixed-pitch and am considering the MT
electric constant-speed. Max diameter I can have is 62" and must be
electrically controlled due to the type of crankshaft on my engine.
Would appreciate some numbers if available.
Thanks!
Pete Cavitt - N320PL
619-701-0784
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