Bell semi-rigid rotor heads

[@sky173]

...and in 5 minutes 45 seconds, one of life biggest questions was answered. Thank you for this. The mechanics of a helicopter never cease to amaze me.

[@dn1927-b7c]

Curious what was the question.

[@andrewashmore8000]

Indeed , never knew now I do.

[@ramjet4025]

Great Show and Tell on Bell Rotor Heads.

[@andrewashmore8000]

Great video , never knew that flexible part was in there , very simple cool way of doing the job of securing in place.

[@leswakeham3596]

Thank you Hal, for showing and explaining this type of rotorhead. It has long intrigued me of its workings. Looking at exploded parts diagrams is nice, however to have the individual components explained of its function in the whole scheme of things, is a bonus. Thank you Sir.

[@SpeedFireARL]

до гениального простая конструкция. браво!

[@buditarigangersang3692]

Yea kreatif sir berarti semua pakai greavitasi berputar semua gods sir thank motivasion keren !..

[@DaleDirt]

Thanks Hal , I maintain a 206L , getting ready to do straps , this helps alot .

[@emperornight467]

Thid id so good! Please do videos like this often cheers

[@pinkdragon6136]

Dude thanks so much, this video is badass!!!!!!!!

[@andrewashmore8000]

Fully agree , some great engineering right there.

[@Neptune730]

I stumbled across this video. Pretty cool. I had no idea that the 206 and other Bells had the straps. I thought it was only in the BO-105 and BK-117 for example. I was wondering what Bell used for the pulling load. I have experience with RC helicopters and most use thrust bearings. I didn't think full size helicopters used thrust bearings but I didn't know how they solved the problem until now. Back in the late 80s a company made a scale rotor head for model BK-117 that had a strap in place of thrust bearings. As far as I know it was the only company that did that. I just looked at your channel. Just fricken great now I have another channel to subscribe to. LOL

[@halhobenshield5931]

Many helicopters use the strap method. I know the MD 500 also has strap packs.

[@ajaydev723]

Thanks hal, nice picture

[@asifheliRC]

Good video thank for explanation. Suscribed.

[@CameronCarter1]

Excellent video, Thanks.

[@davidwallace5738]

Great video. Thank you!

[@tahilhenry8213]

Helpful information,,thanks for sharing

[@dannywilliamson3340]

How much load is on the blade bolt due to centrifugal force from the blade?

[@tomthompson7400]

that was interesting

[@zalgin_6473]

Watching fr hongkong.

[@hugh9park]

Black tusk helicopter. I but the shop heaters in there shop in Squamish!

[@Dragon-Slay3r]

Bell in the middle was orange and semi circle was dark on the right just saying

[@johno9507]

Is there a reason why there is no rubber bumper stop for when the rotor head see-saw's to prevent it from hitting the mast in flight with enough force to fatality tear the rotor head off (mast bumping)?

[@halhobenshield5931]

Not sure why there’s not something more substantial in there to prevent it. It just puts a limitation on the flight characteristics of these aircraft.

[@Pork-Chopper]

If there was, it would not be rubber. Rubber would act as a Brake, slowing down the Rotorhead, not good. The material would have to be something like a block of teflon, tough, but still flexible n slippery. In rotation, centrifugal force keeps the rotorhead horizontal. A forward or rear pushover on the cyclic will cause mast bumping, however these helicopters are not designed for acrobatic maneuvers. The Helicopters with rigid Rotor Heads can handle more loading, but do you really want to be flying a helicopter upside down?? 😳

[@ramjet4025]

Great Video, But, for the first few minutes, what is the annoying sound track? It sounds like a tape playing a reverse track of audio in the background.

[@7249xxl]

Whats up with the double audio

[@Aviator168]

What are the straps for?

[@andrewashmore8000]

When spinning the blades will want to fly out via centrifuge force. It looks like the straps counteract that force while also allowing the blade to turn when the pitch setting is changed via the collective.

[@stealhty1]

Awesome , What holds the Tronion attached to the main shaft ?

[@halhobenshield5931]

One big nut! Sometimes referred to as the Jesus nut. Because if it comes off He’s likely the next person you’ll see.

[@stealhty1]

@@halhobenshield5931 Lol, just like the UH-1 ,,so a thread and nut is what holds the rotor assembly together

[@halhobenshield5931]

@@stealhty1 one nut holds it down onto a split set of cones that centre it in place.

[@andrewashmore8000]

​@@halhobenshield5931what stops the nut get lose.

[@erwe1054]

if you have bo-105 rotorhead, please overview this part ?

[@cloudusterable]

So this head can only see saw is that right ?

[@halhobenshield5931]

Yes the head can seesaw, there’s no lead lag. However it does rotate around the feathering axis.

[@cloudusterable]

@@halhobenshield5931 so this is not like a Bell 47 where the hub is fully universal ?

[@hsv1612]

Great!

[@cesarfernandonovela4023]

hello my friend

[@ismailislam5550]

👍

[@jeffkitney39]

I bet these replacement parts cost🧨🧨🧨🧨

[@bholasharma5810]

Sir, I am from India, I want a job in your company.

[@chopper3041]

Why do you call this a Semi Rigid Head ? It actually is a Semi Articulated Head.

[@MrRexquando]

Semi articulated would be a 3-blade like the Gazelle that flaps via hinge and feather hinge but lead/lag is handled by Friction damper. No teetering in a semi-articulated head.

[@halhobenshield5931]

@@MrRexquando I think it’s a glass is half full or glass is half empty kind of thing.

[@MrRexquando]

@@halhobenshield5931 It's all about the teeter. If it uses teeter it can't be articulated and vis-versa :-) Keep up the great videos. So refreshing to see technical chops on youtube compared to a lot of producers that don't know what they are talking about even in broad strokes (Mentor Pilot, Yellow Pilot, others).

[@Dragon-Slay3r]

Bell was covered with the right semi dark circle I don't know what he said but this is the lie