"Gil G." wrote in message
...
I think the tank would be too heavy to take along... However, I am
thinking that a scuba tank could be used with a regulator and quick
disconnect system to prerotate the rotor, then disconnect the air hose
and immediately start the take-off.

How about a catapult?

Rich "Cum catapultae proscriptae erunt tum soli proscripti catapultas
habebunt " S.