Brandon replied to me: > > > Minimum speed for 30 mph, take-off run of 30 > > yards, > > > > Assuming constant acceleration, the autogyro would > > need > > an acceleration of roughly 7 mph/s for that takeoff > > run. > > Not surprisingly, Vehicles agrees. > > So far my designs have fallen a bit short of this > (although so far only one is an historical design).
The C30A had a 104 kW engine and a Lwt of 0.9 tons, so unrounded gAccel should be 8.5. > One ability of some autogyros to briefly power the > rotor to get it to full rotation speed, then disengage > the power and apply it all to the prop needs to be > accounted for. This can radically shorten the take-off > tun to single-digit yards. And no, this gearing isn't > nearly as heavy or complicated as a helicopter > transmission. Define a new helicopter drivetrain type. Special effects: It provides static lift, but only for purposes of the stall speed calculation, and it does so for x seconds after power is cut. > > That could also help to explain the low stall speed > > of > > modern designs. They're little toys, with a better > > area to weight ratio. > > I'm not sure I could call them toys -- they are just > very light aircraft. One YouTube video was a > promotional film showing the advantages of a light > autogyro over a light helicopter, including one being > used by police for search and rescue. Talking averages here. _______________________________________________ GurpsNet-L mailing list <[email protected]> http://mail.sjgames.com/mailman/listinfo/gurpsnet-l
