coptor crash

#3
Re: coptor crash

I don't think it was the tail rotor. The first evidence of anything interfering with the tail rotor should have been a compromise of directional authority and uncontrollable yawing. But the pilot managed to maintain heading until the the airframe had rolled to about 30 degrees. And loss of tail rotor effectiveness doesn't explain the violent oscillations of the fuselage. The pilot was being dashed to and fro like a rag doll.

The first thing I saw that looked out of the ordinary was some unusual movement of the upper swash plate and rotor head. That gives me to believe the problem originated either in the engine or the transmission. Turning loose of a turbine spinning at 30,000 rpms very well could cause an imbalance that would shake the airframe like that, hard enough to "oil can" the skin of the tail boom and snap it off.
 
#4
Re: coptor crash

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Fred_C_Dobbs</div><div class="ubbcode-body">I don't think it was the tail rotor. The first evidence of anything interfering with the tail rotor should have been a compromise of directional authority and uncontrollable yawing. But the pilot managed to maintain heading until the the airframe had rolled to about 30 degrees. And loss of tail rotor effectiveness doesn't explain the violent oscillations of the fuselage. The pilot was being dashed to and fro like a rag doll.

The first thing I saw that looked out of the ordinary was some unusual movement of the upper swash plate and rotor head. That gives me to believe the problem originated either in the engine or the transmission. Turning loose of a turbine spinning at 30,000 rpms very well could cause an imbalance that would shake the airframe like that, hard enough to "oil can" the skin of the tail boom and snap it off. </div></div>

Nothing near that complicated....the main rotor contacted all that shit in front of the aircraft and torqued everything right into the rest of the mess.
 
#6
Re: coptor crash

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: smokshwn</div><div class="ubbcode-body">Nothing near that complicated....the main rotor contacted all that shit in front of the aircraft and torqued everything right into the rest of the mess. </div></div>
Makes sense. I watched again in slo-mo, this time paying attention to the rotor disk. You can see it moving dramatically the last two or three frames before the cockpit begins oscillating. That explains what was making the swash plate jump around.
 
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