bryancobb
Junior Member
- Joined
- Aug 2, 2010
- Messages
- 5,336
- Location
- Cartersville, GA
- Aircraft
- Owned Brantly B-2b/Fly Kitfox III/Mini-500b
- Total Flight Time
- 1350
I was reading on the MD Helicopters website about some of the design details of the 500 & 600 series machines.
The idea of a hollow static mast that does not spin with the spinning rotor attached to IT at the top is genius.
Then the drive mast (which can be very small diameter) spins inside it. It is splined at the top and bottom so that it carries NO LOAD. The gears in the gearbox carry no axial load and can move up/down slightly on the splines as temperature changes. The rotor hub at the top can do the same and only the tube called the Static Mast carries the lift load (in tension).
All MRGB bearings can be radial ball type and planetary type, simple to set-up gears can be used to result in a bulletproof semi-Brantly clone .
The swashplate tilting sphere can ride up/down the O.D. of the static mast.
Great OLD IDEA!
The idea of a hollow static mast that does not spin with the spinning rotor attached to IT at the top is genius.
Then the drive mast (which can be very small diameter) spins inside it. It is splined at the top and bottom so that it carries NO LOAD. The gears in the gearbox carry no axial load and can move up/down slightly on the splines as temperature changes. The rotor hub at the top can do the same and only the tube called the Static Mast carries the lift load (in tension).
All MRGB bearings can be radial ball type and planetary type, simple to set-up gears can be used to result in a bulletproof semi-Brantly clone .
The swashplate tilting sphere can ride up/down the O.D. of the static mast.
Great OLD IDEA!
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