Clippard

1000 psi. Maximum pressure.

Force is at maximum pressure

Ratio is port size to cylinder size. This should affect speed?

Model Bore Ø Rod Ø Cyl²" Force Port²"Ratio

H9D-1D 9/16" 1/4" .1995 200# .0031 64:1

7DD 7/8" 1/4" .5525 552# .0123 45:1 (1/3 faster?)

Have requested Parker catalog from Cameron at Hyseco.

Have requested Bimba catalog from Andrea at Skeans Engineering.

Have requested Clippard fax from Tom at Wainbee Ltd. 278-4288

Note:- The pitch and yaw controls for rotor and tail could be joined. This would eliminate 2 cylinders at the stick, 1 for nose up/down and 1 for port/starboard. It might be better to leave as is because the current arraignment give some redundancy and safety. Note:- There is no redundancy, yet, for collective.

Collective could be foot controlled, like excelerator in a car.

Calculation made from the Indian helicopter drawing show that 1" of cyclic or collective movement, at 17" on arm give an average movement of .125" (approx.) at the swashplate. If the pull or push on the levers is 10 pounds the force on the swashplate rod end is 10 * 1/0.125 = 80 pounds.

The 9/16" diameter cylinder can deliver a maximum of 200 pounds of force. This is at an arm of 3.5" and there are 2 rotors. This means that a maximum pull on the cyclic stick of 100 pounds at a 15" arm.

If it is decided to locate the hydraulic cylinder(s) at the pedals then consider using flexible hose to the cylinder(s) so that the pedals

1/ can be adjustable for pilots of different heights, &

2/ the foot rest can fold up into the seat when on trailer.

On the ((2 rotors) * (3 cylinders) * (2 ports))- (3 rotor-to-rotor lines) = 9 lines, at their highest point (near swashplate) locate inverted "Ts" with chamber or short vertical tube above and valve above that. One filler pot with valve below can be move from "T" to "T" to bleed air and replace with oil. See sketch in Hydraulic folder.