The Freewheeling Unit. Why do helicopters need one?

[@jarred7689]

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.

[@rollamichael]

Kinda crazy that the sprags can bight down on smooth metal to transmit all the power of the engine to the gearbox. The force equations must be something...

[@leathelhit]

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.

[@yecto1332]

That small round thing can save life Damn engineering can be be simple and crude sometimes

[@6996skull]

This was an awesome explanation of the FWU, thank you so much

[@stachowi]

it's crazy these little gears are handling 500+ shaft horsepower.

[@rahulgovani]

Could you please make a video of now twin engine turbine are mechanically connected? I would love to get some visual understanding

[@mhdwsl9210]

Thank You Sir.. Im studying my Part 66 B1.3 .. ur channel brought me all the motivations..

[@MrSkidkicker]

That’s great to hear. Good luck!!

[@AmbientBassCreations]

Exactly what I was looking for. I'm going for my commercial, then CFI so please keep these videos coming!

[@igormaslov5989]

best explanation

[@Q-Mashela]

Fantastic explanation. Thank you

[@johno9507]

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. 😀🇦🇺

[@miketrissel5494]

What is going to happen if the sprag clutch/bearing starts wearing out? Thanks

[@AdmiralQuality]

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.)

[@coriscotupi]

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..

[@DanFrederiksen]

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.

[@alf3071]

if there's no contact then there's nothing to move them to wedge and gain grip again

[@DanFrederiksen]

@@alf3071 it would have to be a more complicated device. another possibility is electric transmission rather than gearbox so the turbine is a generator and the rotor is driven by a direct drive electric motor. it just might be as efficient as gears and would have location freedom

[@Jim.Thunda]

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 KZbin. Thanks in advance.

[@MrSkidkicker]

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.

[@Surfer05freak]

What happens if the transmission fails? Will the rotors continue to spin because to the free wheeling unit? Can you still auto?

[@jaydenritchie1992]

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?

[@HandyDan]

I'm amazed that this holds up to the torque, I used a 110mm Sprague in my bike engine car and it wore out in 100 miles, started slipping under load.

[@agifariardhya559]

Nice video, can you give me the dimension of freewheel

[@ChandikaAriyarathne-ey8tl]

Thank you a lot

[@rogermota5409]

Fico muito grato pela explicação, um grande abraço do Brasil para você.

[@aleksandarbrankovic3482]

Nice... How mouch torque, and how mouch money sprag clutch? Thanks

[@Aviator168]

I am sure you can figure it out by engine power and rotor rpm.

[@budipirang2694]

Very nice good job

[@hirutasfaw]

What if the freewheeling unit fails to decouple? Will the failed engine continue drive the main rotors?

[@MrSkidkicker]

The engine will drag the rotor rpm down and affect the helicopters ability to autorotate.

[@benjaminjanson9077]

Awesome!

[@bharathhegde1218]

Who is she

[@DeanCove]

Not bad Jamie.. not bad

[@MrSkidkicker]

Ahem, who is this person you speak of. Mr. Skidkicker knows no such person.

[@sydneylaughren3053]

my dad made me do this

[@erwe1054]

from automatic transmission gearbox ))

[@تطوير67]

جيد جدا

[@avalanche9026]

You have no idea what you’re sayng you just playng smart. Is so much to this complex engineering

[@MrSkidkicker]

Nonsense. That’s like saying a door wedge is complex.

[@تطوير67]

جيد جدا

[@تطوير67]

جيد جدا