Multi-rotor copters (I don't know about Ospreys) require some fairly
fast modulation of rotor lift to stay stable and maneuver, which
apparently turbine or recip engines are not capable of doing. So they
need electric motors that can be rapidly controlled.
I looked into this, wondering why you couldn't build one using
weedwhacker engines (cheap and easy to find) or like Rotaxes used on
ultralights, but that was the reason. Too slow to respond or too much
rotational inertia or something. I suppose if there was an easy (and
light) way to build a engine/generator to drive electric motors then
there might be some potential. I am thinking that even a good battery
pack would weigh too much to carry much weight like a person(s) or
payload or it would have been done by hobbyists. I saw one guy who made
one using a bunch of motor/rotors and a battery that only lasted a
coupla minutes if that, and it really did not get much altitude (not
that you would want) and it looked VERY dangerous.
--R
On 4/13/16 3:34 PM, archer75--- via Mercedes wrote:
Per hours flown, which is the safest domestic helicopter?
Engineers on another list argued about the use of full size quadracopters and
similar planes as alternatives to conventional helicopters. They agreed that
the failure of one prop would not mean the aircraft would necessarily crash; as
opposed to the certainty of a crash if a helicopters rotor broke.
The only example I've seen of a man-carrying multi-rotor aircraft was an
experimental that had more than 4 rotors. It didn't look very substantial or
practical, however.
Gerry
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Russ Williams wrote:
Having flown Helos for 3 1/2 years I can tell you Robinson A/C are
pieces of JUNK.
Back when they were introduced I was working for a company that was a
Bell and Sikorsky Dealer and
repair facility. The Robinson people came and made a big spiel to the
owner about becoming a dealer.
Being one of the senior pilots on the staff (Training Captain & Asst
Chief Pilot) I got to do eval. flights.
There were 4 of us that got to do the flights with the Robinson guys.
After each of us getting 5 + hours in the Demo A/C we all came to the
conclusion that the Boss should RUN
not WALK away from the Robinson deal.
Russ W.
ATP Bell 206, Bell 212, Sikorsky S-76
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