Michael M. Butler wrote:
> ...Calculations suggest that Rotons could work all the way out to where air
> acts in a Newtonian way. That's a lot higher than the operating altitude of
> a chopper.
>
> And of course you're only using the rotor for *part* of your lift. That's
> another difference from regular helicopters.
>
> Not promoting, just reporting.
>
> And rockets, all by themselves, are still the prizewinners at inefficient.
>
> MMB