most home builders lack budget or skill. Mostly both.-De Graw is greate contructor and exellent pilot...
-but His constructions are NOT simple=NO many followers...?
Scale favors small tiltrotors (low disk loading).The problem with helicopters is they are mission oriented. They are pickup trucks or work vehicles of the sky. Helicopters are the blue collar of aviation. You will not have a useable aircraft, if you can't hover on demand. You tend to break a bunch of rules with helicopters as hover over the top of trees or mountain ledges or over lakes; high hovers for news crews. Some hover a tank of fuel at a time. We have a helicopter that was the in car camera signal relay for NASCAR in the 80s. It hovered over the tracks until it needed fuel. Our use is observation platform, on a two hour flight we can stop and hover 50 plus times to get pictures. Sometimes only a couple of times. For the most part cruise is secondary importance. EMS want speed and oil platforms want distance. Tilt rotor is really a small market, they are not good helicopters and they are not good airplanes. They do work when you need to go far for a hover, but they have quirks that don't make them better than regular helicopters.
A major part of the trouble of the Osprey was in it's initial design. To fit within existing dimensions, both the wing and disk loading are very high and consequently payload and range is pretty depressing. The Dream machine gives a good account of what that resulted in.Helicopters are far from my area of expertise - or even competence - but I have to mention that the market overall agrees with Don. Compound helicopters (lift rotor + forward-propulsion prop(s)) have been areas of active experimentation since the 1950's. Even ones that converted to a gyrocopter after takeoff and put all the engine power through the forward propulsion propeller(s); the Fairey Rotodyne comes to mind immediately.
Yet none of these have broken into commercial success, very likely for the simple reason Don's putting forward: Once you have VTOL capability, payload weight is far more important to the operator than cruise speed. Where compound helicopters have seen serious consideration was for various very specific niche missions, but that doesn't apply to a general-purpose rotorcraft.
A tilt-rotor is probably the best of all possible worlds, but is hugely complex even when compared to a compound helicopter, and suffers a lot of compromise in VTOL payload capability - much of the "potential" payload is sucked up by having to lift the wing and tails. The V-22 Osprey has a very specific and extreme mission-set to justify its existence, which just isn't there in the homebuilt world.
Making it an ICE-electric hybrid doesn't change any of this.
I'm sure it can be done, but it's genuinely a case of why would you do it?
I do remember that the capabilities of the Augusta Westland A309 as an oil rig crew change vehicle was questioned almost from the start. The nine passenger capacity considered to be to small. When I was travelling offshore, the Sikorsky S-76 and Eurocopter AS365 were of the “small” helicopters used. I think they usually did have ten or twelve seats.I'm sure the workers would appreciate speed over everything else, no doubt. However, the company, who is paying the bill to get them out there, likely wants every possible pound out there at the lowest possible cost. In aircraft design, that generally means slower than the highest speed possible. The trade between fuel economy and payload is likely a little different than it is with airplanes, but I would strongly guess that it still favors a conventional rotorcraft, without the added complexity and reduced payload of a compound type.
1.3 m rotors = no autorotation disk loading too high-moore simple?(for my understanding...)
PS=1.3 m heli rotors get us up to 15 kG/kW ! (specific thrust)
1.3 m rotors=from heli modell, for cocept examination...1.3 m rotors = no autorotation disk loading too high
fixed pitch = no auto rotation
you're a bowling ball enjoying the effects of gravity if you encounter any failure mode requiring autorotation...and there a lot of failures needing pitch control
-we was preliminary tested 7m gyro rotor gearless drived by 20 kW electric motorScaling up often yields poor results. You'll need lower disk loading or more electric motor....
(use less steel and plastic - use more aluminum