Inverted Full Size Helicopters?

Anyone mind if I glean quotes and info from this thread? The topic is very intersting and warrants more research, but the discussion is a great start. Never realized the differences would make such performance differences.

Any comments? Anyone not want to be quoted?

[darren_uk]

"Anyone mind if I glean quotes and info from this thread?"

I don't mind being quoted - let me know where it goes though so I can follow any new discussions elsewhere, I'm finding it all interesting too.


I remember something else I was told too on flying full-sized helicopter - can't remember the full details, but it was along the lines of, "Always keep the disc loaded".

It was when I was discussing turning around to fly in the opposite direction, but doing it using a rough stall-turn. That is, not completely raising the nose of the helicopter to point straight up into the sky.

My version was to raise the nose to slow down my forward airspeed (I probably only ended up pitching about 30-40degrees nose-up), when my airspeed was zero, torque turn (using the pedals) to yaw the helicopter 180 degrees, now I'm nose down and I start increasing airspeed in the new direction, and off I go again.

But all the time the disc was loaded - in my case, by gravity and momentum of the body of the helicopter. Never did the rotors have to "push against" the body of the aircraft, as it does in inverted flight.

Translating that into the loop earlier in the thread - I think, too, that his rotors are always loaded, pulling towards the centre of the loop. Similar to doing loops in a glider or a fixed wing where you pull back on the yolk (pulling the nose up) all the way around the loop.

[colin]

I don't mind being quoted - let me know where it goes though so I can follow any new discussions elsewhere, I'm finding it all interesting too.

Eh? Why wanna go elsewhere? Rather than bring the quotes somewhere else, why not bring the somewhere else to the quotes?
heh

colin needs to lay off the after run oil....

I'm actually looking at writing an 'article' more than a discussion, but as I research it I'll post any questions here for witty answers....

Hi All
I recently went on a trip to devon in a Jet Ranger, whilst the pilot prepared for flight i asked him lots of questions, one of which was if the Helicopter could fly inverted(as models can) and he said that the Ranger couldn't invert as the pitch on the blades cannot be set to negative. He also mentioned that if it could invert for any prolonged time it would probably damage the Turbine gearboxes due to lubrication difficulties. I don't know what this means but thought i would share his words.
Trebor

(Very interesting reading on this thread, thanks to all)

Thanks for the info Trebor. That's something I hadn't thought about. Full size have all kinds of lube and fluids that might have problems. Hydraulics and such. The piston helis would probably be suited better from that respect, but there's still the pitch range and other issues.

[Andrew]

If a full-sized heli can't do negative pitch, how do they do autos?

Excellent question-- but I'm pretty sure you don't need negative to do it otherwise most model pilots couldn't do it either.

Guys???