Didnt the Rv12 thing turn out to be ramp damage?
Cm
You mean this thread? http://www.vansairforce.com/community/showthread.php?t=124185
Be sure to read *this* one, too...
http://www.vansairforce.com/community/showthread.php?t=157206
Didnt the Rv12 thing turn out to be ramp damage?
Cm
No one will ever know, I suspect. Sensenich isn't saying, and the OP is no longer with us.Didnt the Rv12 thing turn out to be ramp damage?
Cm
No one will ever know, I suspect. Sensenich isn't saying, and the OP is no longer with us...
The NTSB Final Report has not been published yet. I wouldn't expect Sensenich to say anything about that propeller while the NTSB is investigating. The accident happened in January of last year, so it may still be several months before they publish the Final, and of course, the propeller may or may not be a topic of interest in their investigation. If the NTSB does not report anything of interest regarding the propeller, then I agree with you..."no one will ever know..."
That report will probably be read by many people, for varying reasons.
The prop split happened long before the accident, he was flying with two nearly new blades when he crashed.
Mark, you said something that raised a flag for me. Metal spar, carbon skin.
Have you exposed it to unusually high temperatures?
There is a big mismatch in thermal expansion coefficient between metals and carbon fiber. Good design can mitigate this some. Its usually fine. Sometimes it isn't. Presumably Sensenich has done thorough testing of this.
Totally speculative on my part, but.......
Mark, you said something that raised a flag for me. Metal spar, carbon skin.
Have you exposed it to unusually high temperatures?
There is a big mismatch in thermal expansion coefficient between metals and carbon fiber. Good design can mitigate this some. Its usually fine. Sometimes it isn't. Presumably Sensenich has done thorough testing of this.
Totally speculative on my part, but.......
Something I learned recently from a neighbor that did some high-speed video when testing a Honda reduction drive. A propeller can shake like a noodle along its longitudinal axis at certain RPM's where a resonance occurs. I suspect that's what's happened here.
And for less informed (me), what is thermal expansion for a matrix of carbon fiber? I looked up and found it was near zero or negative, or it shrinks with higher temps. Is that correct?....
One last post to REALLY close this out. My new prop arrived this afternoon:
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This is what the 3D carbon fiber looks like...AWESOME!
Now I'll have to really baby this baby!