Jens
GyroNew & Paraglider
- Joined
- Nov 5, 2004
- Messages
- 704
- Location
- Sønderborg - Denmark
- Aircraft
- Paraglider and PPG
- Total Flight Time
- Some hundreds
Little rotor - big prop
Little rotor - big prop
102 in (2,6m) is a very little rotor, but quite a big prop. Hopefully it is possible to make these blades homebuild with a reasonable good result in efficiency. That might open the door for building some low and slow rotor craft machines. We are seriously looking at copy milling a blade to get some experience. The job for the blades are:
50 hp into coax rotor for lift of 200 kg = 4 kg/hp.
App. figures for each rotor:
25 hp
Rotor dia: 2,6 m
Load 100 kg (Load per blade 50 kg)
Disk load 19 kg/m2
My current guess:
Rpm 850 = tip 34% of Mach 1 = 379 ft/sec = 115 m/s = 416 km/h
Upper prop 6 deg. (Angel measured to the flat bottom of blade.)
Lower prop 9 deg.
The alu blade is 180x22mm. We might shorten the wood blade to 160x22mm (6.3 x 0.87 in).
What do you think? Will it work?
Little rotor - big prop
102 in (2,6m) is a very little rotor, but quite a big prop. Hopefully it is possible to make these blades homebuild with a reasonable good result in efficiency. That might open the door for building some low and slow rotor craft machines. We are seriously looking at copy milling a blade to get some experience. The job for the blades are:
50 hp into coax rotor for lift of 200 kg = 4 kg/hp.
App. figures for each rotor:
25 hp
Rotor dia: 2,6 m
Load 100 kg (Load per blade 50 kg)
Disk load 19 kg/m2
My current guess:
Rpm 850 = tip 34% of Mach 1 = 379 ft/sec = 115 m/s = 416 km/h
Upper prop 6 deg. (Angel measured to the flat bottom of blade.)
Lower prop 9 deg.
The alu blade is 180x22mm. We might shorten the wood blade to 160x22mm (6.3 x 0.87 in).
What do you think? Will it work?