Motor wound up.

This is from Reno air races.

About 8 seconds in the prop leaves and a second later you can hear the
motor rev up to god only knows how many RPMS.

http://www.youtube.com/watch?v=DhyEn...layer_embedded


Ben.

stol wrote:
This is from Reno air races.

About 8 seconds in the prop leaves and a second later you can hear the
motor rev up to god only knows how many RPMS.

http://www.youtube.com/watch?v=DhyEn...layer_embedded


Ben.


Kinda looks like the prop broke a blade first.


--

Richard Lamb

On Sep 22, 12:21*pm, stol wrote:

This is from Reno air races.

About 8 seconds in the prop leaves and a second later you can hear the
motor rev up to god only knows how many RPMS.

http://www.youtube.com/watch?v=DhyEn...layer_embedded

Kevin wrote about this episode in his blog:

http://www.kevineldredge.com/Network...ing.....htm l

http://www.kevineldredge.com/Network..._Shape!!!.html

http://www.kevineldredge.com/Network...ensive!!!.html

And for once, the comments (so far) on YouTube seem to be pretty
accurate. The sequence as I understand it was:

1. The aluminum AN fitting on the accessory case where the hose from
the oil cooler connects broke.

2. Oil pressure went to zero.

3. The hydraulically-controlled constant-speed prop went to flat
pitch.

4. The engine overrevved. Way over.

5. The #5 rod and nearby counterweight broke and came through the
crankcase, seizing the motor.

6. The blades broke from the hub, and the prop extension broke from
the crankshaft.

Also, sometime during this sequence, the motor thrashed around enough
to break three of the four mounting ears from the back of the case.

7. Kevin flew the airplane, kept it under way and under control, and
did a fantastic job of reeling it back in from way over yawning abyss.

Thanks, Bob K.

On Sep 22, 1:20*pm, CaveLamb wrote:

About 8 seconds in the prop leaves and a second later you can hear the
motor rev up to god only knows how many RPMS.

To address this specific point, note that the video is being shot with
a telephoto lens from a mile or three away. Because sound is so much
slower than light (about 750 mph versus 186 000 miles per second),
what you hear of a distant event lags substantially behind what you
see of it.

So even though you see the prop depart and then hear the motor wind
up, it probably did not happen in that sequence.

Thanks again, Bob K.