Is this chopper about to crash?

John wrote:
"Rhodesst" wrote in message
...

According to the article they only had a 25° nose down attitude. It
looks alot worse than that in the picture. Since most helicopters of
this size typically lift twice there own weight (when empty). I would
estimate that the maximum theoretical nose down angle whould be 60°.
This gives you a thrust vector component of twice youre vertical
component. However the transmission lube systems would not like this at

all.

John Roncallo

As long as you can maintain a vertical component of lift equal to the

weight of

the helicopter, you'll be Ok. Either way, that looks like one hell of a
balancing act.

I don't know for sure but that looks like it might not be too much

different

from a simple (huh?) hover with a heavy sling load as far as control

imputs are

concerned. Of course, I'm probably wrong about that. It's never that

easy, if

hovering is considered easy. :-)

Fly Safe,
Steve R.


Ok i have read all the posts up to 23rd dec on this thread, i understand
it's some sort of an illusion.

I know next to nothing about sling operations.

I'm just surprised that no one seemed to think about the principles of
dynamic roll over and try to apply them here ?

I know the sling load probably isn't stuck to the ground ..but could become
stuck, then there is inertia and acceleration considerations, i have only a
fuzzy understanding of all this ...but i think that the maximum nose down
angle when towing would be a lot less than
anyones gut feeling or quick calculation based only on thrust to weight
ratios and thrust vectors.

Do i have a point ?
I'm sure someone will elaborate on this?



There is no potential for DR. Because of the sling load is still within
the correct CG envelope.

JR

Can somebody post the link to the helicopter photo again please?

Isn't this a Columbia Helicotpers Picture? It's in their colors - and
nope, it didn't crash.


Bob

"Bob" wrote in message ...
Can somebody post the link to the helicopter photo again please?

Actually, you can find it here :

http://www.colheli.com/colheli.html

That's Columbia Helicopter's website. You'll see pictures of this and
others in their operations in the Photo Gallery!

Best Regards!


Bob