Hi,
I’m in the conceptual design stage of a self-launching glider similar to the electric versions of the archaeopteryx and the swift.
I’ve done some research on the two, but it’s a bit hard as some of the information is very scarce.
The swift swings a 1.4m prop using a HPD10 (10kw/13.4hp) motor. It can also be upgraded to a HPD13.5 (13.5kw/18.1hp) motor.
The archaeopteryx swings a prop around about 0.65m using a MGM Compro Rex 30 which is rated at 15-18kw (20-24hp). This produces a take-off run of 50m and a climb rate of 400-500ft/min.
As the propeller diameter has a huge influence on the fuselage design, I want to lock in the propeller diameter early on.
I want to do a trade study on propeller diameters and thrust output/climb rate.
Using Dan Raymer’s calculations for initial sizing, the propeller diameter should be about 1.1m.
Is there an easy way to calculate the differences in thrust/climb rate with different propeller diameters? All the books I have on my bookshelf don’t really help.
Thanks
I’m in the conceptual design stage of a self-launching glider similar to the electric versions of the archaeopteryx and the swift.
I’ve done some research on the two, but it’s a bit hard as some of the information is very scarce.
The swift swings a 1.4m prop using a HPD10 (10kw/13.4hp) motor. It can also be upgraded to a HPD13.5 (13.5kw/18.1hp) motor.
The archaeopteryx swings a prop around about 0.65m using a MGM Compro Rex 30 which is rated at 15-18kw (20-24hp). This produces a take-off run of 50m and a climb rate of 400-500ft/min.
As the propeller diameter has a huge influence on the fuselage design, I want to lock in the propeller diameter early on.
I want to do a trade study on propeller diameters and thrust output/climb rate.
Using Dan Raymer’s calculations for initial sizing, the propeller diameter should be about 1.1m.
Is there an easy way to calculate the differences in thrust/climb rate with different propeller diameters? All the books I have on my bookshelf don’t really help.
Thanks
