The Osprey props/rotors are Allison turboprops which use cyclic pitch control that can change lift rapidly; either manually or by computer. It would seem that the same system could be used in a personal quadricopter driven by a light plane engine mechanically connected to the props. The main question would be how much HP you would need to lift pilot, fuel, and machine I suppose. Some of the early helicopters used light plane engines but I don't remember their HP. http://www.globalsecurity.org/military/systems/aircraft/v-22-conversion.htm Gerry
Rich Thomas wrote: > Multi-rotor copters (I don't know about Ospreys) require some fairly > fast modulation of rotor lift to stay stable and maneuver, which > apparently turbine or recip engines are not capable of doing. So they > need electric motors that can be rapidly controlled. > > I looked into this, wondering why you couldn't build one using > weedwhacker engines (cheap and easy to find) or like Rotaxes used on > ultralights, but that was the reason. Too slow to respond or too much > rotational inertia or something. I suppose if there was an easy (and > light) way to build a engine/generator to drive electric motors then > there might be some potential. I am thinking that even a good battery > pack would weigh too much to carry much weight like a person(s) or > payload or it would have been done by hobbyists. I saw one guy who made > one using a bunch of motor/rotors and a battery that only lasted a > coupla minutes if that, and it really did not get much altitude (not > that you would want) and it looked VERY dangerous. > > --R > > On 4/13/16 3:34 PM, archer75--- via Mercedes wrote: > > Per hours flown, which is the safest domestic helicopter? > > > > Engineers on another list argued about the use of full size quadracopters > > and similar planes as alternatives to conventional helicopters. They agreed > > that the failure of one prop would not mean the aircraft would necessarily > > crash; as opposed to the certainty of a crash if a helicopters rotor broke. > > The only example I've seen of a man-carrying multi-rotor aircraft was an > > experimental that had more than 4 rotors. It didn't look very substantial > > or practical, however. > > Gerry > > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > > Russ Williams wrote: > >> Having flown Helos for 3 1/2 years I can tell you Robinson A/C are > >> pieces of JUNK. > >> Back when they were introduced I was working for a company that was a > >> Bell and Sikorsky Dealer and > >> repair facility. The Robinson people came and made a big spiel to the > >> owner about becoming a dealer. > >> Being one of the senior pilots on the staff (Training Captain & Asst > >> Chief Pilot) I got to do eval. flights. > >> There were 4 of us that got to do the flights with the Robinson guys. > >> After each of us getting 5 + hours in the Demo A/C we all came to the > >> conclusion that the Boss should RUN > >> not WALK away from the Robinson deal. > >> Russ W. > >> ATP Bell 206, Bell 212, Sikorsky S-76 > > _______________________________________ > > http://www.okiebenz.com > > > > To search list archives http://www.okiebenz.com/archive/ > > > > To Unsubscribe or change delivery options go to: > > http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com > > > > > > > _______________________________________ > http://www.okiebenz.com > > To search list archives http://www.okiebenz.com/archive/ > > To Unsubscribe or change delivery options go to: > http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com > > > > ----- > No virus found in this message. > Checked by AVG - www.avg.com > Version: 2015.0.6189 / Virus Database: 4545/12024 - Release Date: 04/13/16 > -- arche...@embarqmail.com <arche...@embarqmail.com> _______________________________________ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
