dave
Joined: 22 Sep 2006
Posts: 1382
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 Posted: Thu Jan 11, 2007 7:20 pm Post subject: Over-torqued GSC Prop |
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Yes , GSC was told ands got pics.
said he never seen that before. > for what that is worth <
I am not sure that this one was ever over torques Deke, you can see by the
pics http://www.cfisher.com/gsc/
that the alum. block have a "healthy gap" and I know that the owner is very
aware and has built a close to 25 planes now .
I would rule it out to age, moisture fatigue and just bad luck. Now if it
was new well I would lean more on GSC.
That prop I think had over 300 or 400 hours on it and over 10 years for
sure.
Dave
FYI I would not condemn your GSC prop over this kinda stuff but I would
certainly make sure that you keep an eye on the condition, time of service
in years as well as hours running time . I think GSC says 500 hours or 5
years ? Over all GSC props do work well I find. Those videos I did in
snow and short take offs and deadsticking in the last month was all on a
GSC.
A few more below,
Here is another GSC problem
http://www.ultralightnews.com/safety_bulletins/gsc_servicebulletin.htm
another one ( good read )
http://www.auf.asn.au/airworthiness/gscbladeshed2.pdf
The problem covered in those issues related to failure of wooden blades at
the glue line adjacent
to the socket and possible crushing of the blade root from deterioration or
over tightening of the
bolts resulting in degraded clamping of the blade. This was aggravated by
deterioration of the
wood from moisture.
A further (very well compiled) report of blade shedding has been received,
this time involving a
three bladed wooden GSC propeller fitted to a 912 powered Lightwing. The
owner was
experimenting with methods of improving engine power output and he had
achieved an RPM
increase from 5,600 to 5,800 RPM on climb. On levelling at 1,000ft, there
was an almighty bang
and the motor stopped immediately. The aircraft was landed safely and
subsequent inspection
revealed that all three blades had parted company with the hub.
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