Thank you Jaun for the video. You do an excellent job. I enjoy watching your videos

@juanrivera1040

2 жыл бұрын

I appreciate that!

Flying model 02-18, the Tom Sled build, N3722T with 1340 Hobbs hours TTAF, ... I expected the upper and lower sheaves to be dis-aligned during clutch dis-engagement, and aligned during full engagement. There is mild vibration between 60% and 80% engagement, but I expected this, too. My engagement process is slow and gradual, as I watch my tachometers during the process up to 485 mr rpm, the ratio marriage between the engine 48,500 and mr shaft rpm. Disengagement is full speed. Immediately post flight inspections with a laser thermometer reveal the six drive belts and both upper and lower sheave temperatures at 120F or less.

Cómo ajustar el embriague del elicoptero dé construcción, gracias 🙏👏👍

Have you ever seen other belt drive clutch systems shake like this on other helicopters that use them?

@jcoghill2

2 жыл бұрын

No they are not supposed to do this in normal operation. This type of clutch is used on the Bell 47, Schweitzer 300, all Robinson piston helos, Rotorway piston helos, all Mosquito helos, Helicycle. It's used extensively even on some turbine helos.

@codmott286

2 жыл бұрын

@@jcoghill2 what? Certified turbine helicopters dont use a clutch at all. And the mosquito uses a centrifugal clutch.

@chippyjohn1

Жыл бұрын

@@jcoghill2 Bell 47 uses centrifugal, just FYI.

@chippyjohn1

Жыл бұрын

Robinsons and the Rotorway has the same issue. Many Robinsons have had forced landing because of belts breaking and same for rotorway. Not something they advertise though. The use of belts is intended to be CHEAP, not a good design.

So this is what your belts do as tension is applied. Those belts sure sit deep in their grooves. Aren't the belts supposed to be bigger in cross-section? I've seen many belts in the automotive world and some of them are stretchier than others. Could be what's going on here. The belts are too stretchy so it takes longer to reach full engagement, that combined with belt tension makes the belts vibrate. As for the engine moving that's never supposed to happen. Check the torque on each engine mount bolt, several are loose. The pulleys should be in alignment at all times. This is another indication that something is loose. Hey I came back to tell you I just found out those pulleys are supposed to be balanced. If yours wasn't balanced or it was done wrong it can cause vibrating belts.

Too many belts, too complicated. It could be much simpler.