RunRyder - Full size heli tail blade strike

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Crashed? Discussion and Photos > Full size heli tail blade strike

Sam2b
Key Veteran
Location: Seattle, WA - USA

Man, even the big birds suffer when the tail hits the ground. I feel bad for the guy who fell out while sitting on the edge.

_Sam B_

01-31-2008 01:52 AM

HOMEPAGE

"Cam"
Senior Heliman
Location: Japan

Throttle hold

Throttle Hold!!!

Why didn't the pilot glue it to the deck?

See all the soldiers pull themselves in and hold on!

02-05-2008 08:43 AM

TrexRookie
Key Veteran
Location: San Francisco, CA

momentum? that, and hesitation... once the tail hit the ground, it must've stripped the tail linkage immediately resulting in increased headspeed due to the fact that the tail drive was no longer consuming torque from the engine... off the bat, the pilot may not have realized he smacked the tail into the ground until it was too late and the helicopter was already pirouetting... and not all full-scale helicopters have negative pitch..

02-23-2008 11:14 AM

Heliman92
Senior Heliman
Location: Pennsylvania

to it looked obvious that he came in at a wrong angle and was going to fast

"You can't blame gravity for everthing"

02-23-2008 02:47 PM

Proteus206
New Heliman
Location: Windsor, Ontario, Canada

I have to disagree about the negative pitch bit. Haven't you heard of an "AUTOROTATION". That maneuver requires that at least part of the blade be negative to keep the rotor speed up.

And I don't think the tail rotor hit the ground. If he hit hard enough, there could have been something in the tail rotor drive or control linkage that let go. Or possibly boom flex locked the pitch controls. He did wait entirely too long to cut the power.

The BELL UH-1, (Huey) used to have problems with the 42 degree gearbox in the tail rotor drivetrain.

02-23-2008 02:54 PM

TrexRookie
Key Veteran
Location: San Francisco, CA

we can sit here and criticize the pilot and dissect what he did wrong all day long, but I'm sure things felt and looked much different in his shoes...

02-24-2008 09:18 PM

krashtagain
Veteran
Location: ohio

His boxers felt warm and mushy i'm sure

Learn to 3D or die trying !!!!

02-26-2008 04:25 AM

rjhpilot91
Senior Heliman
Location: Mays Landing, NJ USA

Proteus 26

A full size helicopter from an aerodynamic standpoint does not technically need negative pitch to auto. All full size helis fly and hover with a lot of positive pitch. At 0 degrees pitch the weight of the helicopter itself will cause the helicopter to descend and the blades to subsequently speed up.

As to the tail rotor contact, I agree. That tail rotor is really high placed and they more than likely broke the tail driveshaft or bearings along that line in the tail drive.

03-16-2008 06:52 PM

Wingman77
Key Veteran
Location: Pulaski TN US

Quote
All full size helis fly and hover with a lot of positive pitch. At 0 degrees pitch the weight of the helicopter itself will cause the helicopter to descend and the blades to subsequently speed up.

sorry dude but you are wrong the blades will not speed up unles somthing is pushing them.

man I bet it is hard to stay in a heli that is spinning like that.

I have a friend that has been in two military heli crashes and one C130 crash.

03-17-2008 02:03 AM

sincity
Veteran
Location: Pasco, WA

Hmm... I seem to remember that at full down collective the Huey had something like 1.6 degrees of positive pitch. I'm throwing my hat in that NO full size heli has negative pitch. If it did, there would be many helis without tails out there! You have seen how much the blades flex on a full scale right? Negative pitch would take them tails right off!

I'll let a real heli pilot chime in though.

03-19-2008 06:27 PM

Heliflyer3D
Heliman
Location: USA

Bring out the Epoxy...LOL!

If you can do it, I can do it better...and inverted :o)

03-25-2008 11:09 PM

TheOtherSTLRep
Senior Heliman
Location: St. Louis MO

Think about this... Full scale rotor blades are not straight down the span of the blade. Each one has some amount of twist in it. At the root of the blade, it can be positive while out at the tip it can by slightly negative. That is where you get your negative pitch from (although it might only be a degree or so).

Eric Chandler

03-28-2008 04:38 AM

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Crashed? Discussion and Photos > Full size heli tail blade strike

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