Wierd Prop Flex and failure Picture

[1bwana1]

I never noticed it flexing while I was drilling, mounting it. Of course, now that it has delaminated, it has no structural integrity on one side.

[Blip]

Can you identify any porosity in the laminate of the broken blade? Just wondering if it was laid up badly.

[SleepyC]

That there is a photo anomaly having to do with shutter speed.
Sometimes you will get them where the prop looks like its at a 90 deg angle to itself, and sometimes like there is an extra blade that is horizontal to the actual prop.

The lighting has to be right and the shutter speed compared to the prop speed has to be just right.

Its like when you point a video camera at a computer screen and it appears to be blinking and moving up, depending what your FPS is can make that happen or take it away.

Cool Pic Steve!

[anders e]

look at the pikture.this is a jas 26x10 (wood)

[CRUISER]

Having delam in the blade is strange sounding to me, unless it was exposed to some heat. I had a cf prop suffer from resin migration due to excessive heat at hub which loosened bolt torque then in one horrible heart beat snap off all six bolts and go flying. I was test running eng in front of house at the time and i didn't notice fuel line flop over to exhaust and collapse from heat. the lean condition caused heat to build rather quickly into hub and the resin will begin to migrate when it gets slightly over the cureing temp from the molding process. I was very lucky as i had just moved from the front to rear of eng. with motor belt high. the prop left motor and out about 9 feet then arc'd over hitting side os house and walked along house above windows till it lost its energy and fell behind my motorcycle ! It could have easily vicerated me. I was told by someone who is part of that industry that if prop was mold cured at 160 deg that the resin can start its migration at around 200 deg ! I feel fairly certain that this info i got was to a high degree accurate. It sure looked accurate to me when i examined the blade. looking into bolt holes you could see what happened. I'll stay with wood till i know my motor is stable and running cool !