Hi,
I have nothing to say re the suitability of the microswitches/diodes used by
Woodcomp
in the SR3000. However, from what I know about the characteristics of the
scimitar bladed SR3000 fitted with either the reversing or feathering options,
I feel that they are unlikely to have been the cause of Jos' accident.
Let's consider some facts:
Fact #1 - Woodcomp specified that a 10A circuit breaker should be used with that
propeller and I believe that's what was fitted to Jos's aircraft.
Fact #2 - under heavy load (high engine power, pitch motor stalled or moving
very
slowly), the SR3000 pitch motor is capable of drawing more than 10A.
Fact #3 - Jos's propeller had recently returned from the factory and (Jos,
please
correct me if I am wrong), had not been checked to see that the fine limit
microswitches were correctly set so that the aircraft would be flyable with the
pitch stuck on fully fine.
Therefore, it's possible for the C/B to pop simply by applying enough load to
the
pitch motor. If it pops when the prop is fully fine, expect trouble.
Regards,
Mark
PS - I informed the factory in 2007 that the scimitar bladed SR3000 required an
excessive amount of current to go coarse . Nothing came of it.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=344245#344245
|