Maybe it’s because rotor brake was U/S, and they don’t wanna shut down there , because it will block the deck , for quite sometime.. The Helideck must always be open all the time.. So, this is just a temporary solution, and This doesn’t mean really against safety , it’s preventing blade hits tail boom , when starting , still low rpm in offshore strong wind.. appreciated to the guy holding the blades 🙏🚁🚁👌
Incredible the size of the rotor blade which is in effect the wing, of which I first saw up close on a Bell 222 over 25 years ago this video took me back in time..
Even with rotor brake and the blade stationary, the rotor blades will flap also with the high wind. Beside you don't expect the " Heavy" Blades to instantly spin at high speed like your toy fan. The heavy blades still needs time to built up the momentum. These slow spinning blades will flap and hit the tail boom.
Fascinating, I never realised that you had to hold onto the rotors of a helicopter as it starts. Looks pretty dangerous - important to know when to let go I suppose. Is it just the 214ST that requires this with the two blade wide cord arrangement and only in high winds?
Just for high wind starts with 2 bladed/teetering rotor heads - if the blades don't spin up fast enough then there's a possibly of a blade flapping back and striking the tail boom.
Its a shame that someone hasn't replaced the twin blade rotor head with either an enlarged B412 or better yet at UH-1Y four blade rotor. Would make a killer medium twin. Anyone know why Bell chose the twin blade configuration rather than the presumably more efficient four blade one?
A two bladed rotor has roughly half the parts, cost and complexity of a four-blader. Two bladed machines are also much easier to hangar because of the compact size when the rotor is aligned with the fuselage. Overhaul costs are cheaper because most of the rotor components are life-limited...when they reach a specified number of operational hours, you throw them away and buy new ones. A two blade rotor is way cheaper to overhaul. The ride quality of a two blader is not as good as machine with 4+ blades, but for a production workhorse where ride is not a priority but operational costs are, (oils rigs, logging, etc) the two blader is the best option...yes I was an engineer at Bell for 10 years.
@Hoy Sum The nodal beam suspension is a system where the transmission and main rotor are attached to flexible beams that are tuned such that they have stationary nodes at the excitation frequency of the main rotor. The fuselage is attached at the stationary nodes and therefore the vertical movement of the rotor and transmission is cancelled and does not propagate to the fuselage and cabin. The result is a smoother ride and less fatigue on passengers and crew. It is a completely passive system and requires no power.
I wonder how much more efficient the four (or more) blade rotor is compared to the two bladed. More rotor area = more lift? I think I read somewhere that the 214ST is the heaviest twin rotor hello made. Perhaps there a limit to how far you can scale a twin rotor'd hello. I obviously know very little about this subject.
In general, more blades allow you to develop more thrust, but are less efficient than a rotor with fewer blades. If you have lots and lots of torque available, and you want to lift a lot, it makes sense to have more blades. If your power plant can't develop all that much power, it may make sense to have fewer blades. Thus Bell 47 and R22. Lots of horsepower like a CH53 and you want to lift artillery and such, more blades. A guy I used to fly with talked about windy day startups on the oil rigs, having a guy with a broom to help the first blade or two over the tail boom...
Maybe it’s because rotor brake was U/S, and they don’t wanna shut down there , because it will block the deck , for quite sometime.. The Helideck must always be open all the time.. So, this is just a temporary solution, and This doesn’t mean really against safety , it’s preventing blade hits tail boom , when starting , still low rpm in offshore strong wind.. appreciated to the guy holding the blades 🙏🚁🚁👌
Incredible the size of the rotor blade which is in effect the wing, of which I first saw up close on a Bell 222 over 25 years ago this video took me back in time..
Post some more video of the 214 if you have it!!!! Thanks
Here from that Instagram comment 🗿
omg i love that work
Nice. If standard procedure: How much pancakes can the ground assistant eat?
WOW, THAT MIGHT BE A JOB I'D NOT WANT! John P.
lol, i would of loved to see him try that on a chinook! lmao!
@TheDigitalKiwi Maybe it was because Bell did have as much 4 blade experience at the time.
Apparently a high wind start without the use of the rotor brake, not the smartest thing I've ever seen!
Even with rotor brake and the blade stationary, the rotor blades will flap also with the high wind. Beside you don't expect the " Heavy" Blades to instantly spin at high speed like your toy fan. The heavy blades still needs time to built up the momentum. These slow spinning blades will flap and hit the tail boom.
@TheDigitalKiwi No other Bell products have the same issue with the teetering head.
Fascinating, I never realised that you had to hold onto the rotors of a helicopter as it starts. Looks pretty dangerous - important to know when to let go I suppose.
Is it just the 214ST that requires this with the two blade wide cord arrangement and only in high winds?
Just for high wind starts with 2 bladed/teetering rotor heads - if the blades don't spin up fast enough then there's a possibly of a blade flapping back and striking the tail boom.
Its cause they are midsea with high winds.
Must have been an interesting JSA.
Its a shame that someone hasn't replaced the twin blade rotor head with either an enlarged B412 or better yet at UH-1Y four blade rotor. Would make a killer medium twin.
Anyone know why Bell chose the twin blade configuration rather than the presumably more efficient four blade one?
A two bladed rotor has roughly half the parts, cost and complexity of a four-blader. Two bladed machines are also much easier to hangar because of the compact size when the rotor is aligned with the fuselage. Overhaul costs are cheaper because most of the rotor components are life-limited...when they reach a specified number of operational hours, you throw them away and buy new ones. A two blade rotor is way cheaper to overhaul. The ride quality of a two blader is not as good as machine with 4+ blades, but for a production workhorse where ride is not a priority but operational costs are, (oils rigs, logging, etc) the two blader is the best option...yes I was an engineer at Bell for 10 years.
@Hoy Sum The nodal beam suspension is a system where the transmission and main rotor are attached to flexible beams that are tuned such that they have stationary nodes at the excitation frequency of the main rotor. The fuselage is attached at the stationary nodes and therefore the vertical movement of the rotor and transmission is cancelled and does not propagate to the fuselage and cabin. The result is a smoother ride and less fatigue on passengers and crew. It is a completely passive system and requires no power.
How wide are the blades?
@70JaguarEtype yeah you must had worked at an local barber shop for at least 3 yrs
What about the tail rotor bro.
I wonder how much more efficient the four (or more) blade rotor is compared to the two bladed. More rotor area = more lift? I think I read somewhere that the 214ST is the heaviest twin rotor hello made. Perhaps there a limit to how far you can scale a twin rotor'd hello. I obviously know very little about this subject.
In general, more blades allow you to develop more thrust, but are less efficient than a rotor with fewer blades. If you have lots and lots of torque available, and you want to lift a lot, it makes sense to have more blades. If your power plant can't develop all that much power, it may make sense to have fewer blades. Thus Bell 47 and R22. Lots of horsepower like a CH53 and you want to lift artillery and such, more blades.
A guy I used to fly with talked about windy day startups on the oil rigs, having a guy with a broom to help the first blade or two over the tail boom...
Creepy Johnny?
Seriously WTF?!?