Thank you for explaining it so well and taking the time to make the video. The freewheeling unit in a helicopter rotor system automatically disengages the rotor from the engine in the case of an engine failure. The freewheeling unit allows the engine to drive the rotor, but if the rotor speed ever becomes greater than that of the engine, the freewheeling unit prevents the rotor driving the engine.
Great Mr Skidkicker. It helped a lot understating free wheeling unit. Now I can teach better my students, even will show your video to the students. Great job. Keep posting more about helicopter systems.
I had a sprag unit fail on a large radio control helicopter in flight, the engine rpm went through the roof but rotor rpm was dropping quickly, I still managed to pull off one of my greatest autorotations of all time. 😀🇦🇺
surprising that it grips a smooth shaft, that it doesn't have the same number of indents. it should also be possible to design it such that when reversing that it lifts the contacts completely so there is no wear when freewheeling.
Thanks for the lesson. I'd like to see a lot more. Dose the K Max intermesh chopper subject to mast bump ? I can't find any info on RU-vid. Thanks in advance.
Great question. While I am not 100% certain, and because the tail rotor can induce the roll that leads to the mast bumping condition, and due to the lack of tail rotor, it seem as though the chances of mast bumping is quite low.
A lot of power/torque put through a fairly small in comparison to the main rotor shaft I know there is epicycle reductions but I would still thought it would have a clutch pack lockup similar to some automotive limited slip units or as either the primary or secondary to a sprag bearing, not mention pressure lubed sprag for training aircraft. What weigh oil is used in the transmission, is agricultural tractor transmission oil sufficient?
How does a twin engine not always have the lagging engine freewheeling behind the faster one and therefore not contributing at all? (I'm assuming it's virtually impossible for them to maintain the exact same RPM even under control by the engine governor.)
A certain amount of torque is required from both engines. The fact that each engine is generating torque guarantees that it is not just lagging behind or going along for the ride from the other engine..
