Fast helicopters

Any extra weight, including wings, will act as ballast. The thing is
that if you want a fast helicopter, you have to pay for it somehow.
That big disk on top of your diskcopter is a heck of a huge ballast
too.

The simplest way to make a helicopter go faster is to simply increase
the rotor rpm. That way, the differential of lift as the helicopter
goes faster and faster is less significant than a slower turning
rotor. That is, at 400 mph tip speed and at 100 mph forward velocity,
you have a 200 mph differential or 50% of the tip speed. At 1000 mph
tip speed, you still have a 200 mph differential speed but its only
20% of the tip speed.

So in this example, a helicopter with a 1000 mph tip speed could go
forward at 250 mph before hitting 50% differential.

I'm not sure what the actual tip speed is, but I know that a lot of
modern fully articulated systems run at tip speeds just under the
speed of sound in order to significantly reduce the chances of ground
resonance.

Dennis.

"George Vranek" wrote:

I am sorry, but there is no video of this model. Nearly each helicopter
company has made trials with adding wings to their machines and all dropped
them again. During the hoverig the additional wing acts as a balast only and
reduces the hover efficiency of the machine. The heavy disk is able to store
a lot of kinetic energy, which allows vertical landing in autorotation.

Dennis Hawkins
n4mwd AT amsat DOT org (humans know what to do)

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