The BIGGEST helico: the MI12!(rarely seen in flight)

[Dave_Jackson]

Mart,

Remember that the Side-by-Side Mi12 was intended to be a heavy lift transport craft, not a highly maneuverable attack helicopter.
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In addition;

1. The world wants more fuel efficient vehicles.
2. Boeing is bringing out its 20% more efficient Dreamliner airplane.
3. Prouty says; "The overall airplane lift-to-drag ratio can be 10 to 30, depending on the configuration, whereas the maximum a helicopter can do is 4 to 6."
4. Prouty says, "... tail rotor absorbing 10 to 20 percent of the engine power".

One improvement is obvious;



.... and there are many more to come from progressive manufacturers.

Dave