magilla
Gyro Project Owner
- Joined
- Dec 17, 2005
- Messages
- 546
- Location
- Little Rock, AR
- Aircraft
- UH-1H / UH-60A
- Total Flight Time
- 2000+ RW
OK, it's been 4 years since I've had the Jungle Gym in my garage, and I'm finally in a place where I can work on it and get it going.
I've completed the new 2276 motor, with 84" prop, and I have a new double-bearing rotor head installed. Everything is there for it to fly...except the pre-rotator.
I have two hydraulic pumps (Griesen 25's), I just have to figure out how to drive them.
After nearly a year of trying to mount it to the driveshaft end of the VW (the pulley end has the 2:1 Valley Engineering redrive and prop), it got WAYYYYY too complicated.
(I had an electric mower clutch mounted to a driveshaft mounted to the hydraulic pump)
Just too many issues. It became a nightmare...
Then one day, when I separated the motor from the Diehl accessory case, I had a brilliant flash (I think)
Tell me whether you think this would work:
If I cut a small ellipse into the top of the Diehl accessory case where it mounts to the engine, I can expose a portion of the flywheel.
The VW flywheel has a 1" essentially flat section before the ring with the starter teeth.
If I use a small rubber friction wheel, (like those used on the direct drive pre-rotator systems), and mount directly to one of the hydro pumps, I could mount a plate for the pump to rotate and have the wheel engage the flat spot.
I know they make X-shaped Diehl accessory cases with flywheels exposed, so I am not worried about strength issues with the ellipse cut out of the Diehl case. The pump will rotate down via cable, and the wheel will engage the flat spot behind the teeth. The pump will be mounted to a plate attached to the frame, so no weight or stress will be felt by the Diehl case or the motor mounts...
The flywheel is fairly large, so to maintain a decent ratio for the pump, the wheel dimaeter will have to be 5" or so.
Anybody see any problems so far?
On the driveend, the griesen pump is attached to a bendix, which then engages the 89-tooth wheel on the rotor.
I would prefer to mount it directly with a freewheel clutch system...removing the bendix and ring, and putting a belt on. The rotor would always be able to go faster than the pre-rotator, when engaged.
What do you think?
Need some help with parts, if they are available - like a pulley for the RFD head, and a line on freewheel clutches
Otherwise, I need to mount an electric pre-rotator. It's an RFD head, but I can't seem to find any RFD electric prerotators or systems.
Any help would be appreciated. If I don't get this thing off the ground this next year, it's going to be sold.
I've completed the new 2276 motor, with 84" prop, and I have a new double-bearing rotor head installed. Everything is there for it to fly...except the pre-rotator.
I have two hydraulic pumps (Griesen 25's), I just have to figure out how to drive them.
After nearly a year of trying to mount it to the driveshaft end of the VW (the pulley end has the 2:1 Valley Engineering redrive and prop), it got WAYYYYY too complicated.
(I had an electric mower clutch mounted to a driveshaft mounted to the hydraulic pump)
Just too many issues. It became a nightmare...
Then one day, when I separated the motor from the Diehl accessory case, I had a brilliant flash (I think)
Tell me whether you think this would work:
If I cut a small ellipse into the top of the Diehl accessory case where it mounts to the engine, I can expose a portion of the flywheel.
The VW flywheel has a 1" essentially flat section before the ring with the starter teeth.
If I use a small rubber friction wheel, (like those used on the direct drive pre-rotator systems), and mount directly to one of the hydro pumps, I could mount a plate for the pump to rotate and have the wheel engage the flat spot.
I know they make X-shaped Diehl accessory cases with flywheels exposed, so I am not worried about strength issues with the ellipse cut out of the Diehl case. The pump will rotate down via cable, and the wheel will engage the flat spot behind the teeth. The pump will be mounted to a plate attached to the frame, so no weight or stress will be felt by the Diehl case or the motor mounts...
The flywheel is fairly large, so to maintain a decent ratio for the pump, the wheel dimaeter will have to be 5" or so.
Anybody see any problems so far?
On the driveend, the griesen pump is attached to a bendix, which then engages the 89-tooth wheel on the rotor.
I would prefer to mount it directly with a freewheel clutch system...removing the bendix and ring, and putting a belt on. The rotor would always be able to go faster than the pre-rotator, when engaged.
What do you think?
Need some help with parts, if they are available - like a pulley for the RFD head, and a line on freewheel clutches
Otherwise, I need to mount an electric pre-rotator. It's an RFD head, but I can't seem to find any RFD electric prerotators or systems.
Any help would be appreciated. If I don't get this thing off the ground this next year, it's going to be sold.