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Home✈️Aircraft🚁HelicopterHelicopter Main Discussion › Why clockwise rotation ?
02-26-2010 05:06 AM  10 years ago
trunkmunki

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Bangor

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Pretty sure the Bell and MD rotate the same way, which of course is the RIGHT way.

At any rate as for engine rotation, on full scale aircraft it is much a question of geography: in most of the english-speaking world propellers rotate clockwise when viewd from behind the engine, and in russian/chineese areas the other way. Seems everyone in their respective areas just tried to keep it standard.
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02-26-2010 05:54 AM  10 years ago
cdrking

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Seattle

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The real reason why real helicopters rotate counter clock wise is because the pilot in command seat is on the right side so if you lose tail rotor the heli will start rotating clock wise so you will be able to see out of the window.
That’s what designer’s hade in mind, Some manufactures follow this rule some don’t.
My comment was based the above quote. The Bell Jetranger is flown from the right seat, the MD500 is flown from the left seat, both rotor systems rotate the same way. So the above comment is out the window, so to speak.

Jeff
To hover is divine, the alternative is rather PLANE.
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02-26-2010 06:11 AM  10 years ago
seattle_helo

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That is for certain.
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02-26-2010 07:13 AM  10 years ago
nivlek

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Norfolk England

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I've flown a couple of helis belonging to a clubmate which have counter clockwise rotating blades . I didn't do anything much with them , but what really seemed strange to me was hovering nose in with the heli leaned over the 'wrong' way ! I hadn't even noticed it while hovering tail in . At the end of the day , it gets dark .
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02-26-2010 07:17 AM  10 years ago
MattJen

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UK

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i have flown a lot of different machines over the years, and i have found a left hooker weird, it is all in the mind cos the only difference is when it sits in the hover it leans a different way to a right hooker.
I also found right circuits easier on a left hooker cos i am turning with the rotation, and on the right hooker the left circuits were easier.If i remember correctly something called gyroscopic procession.

I have also found it hard to adjust to seeing the blades going oposite, hence the reason i was not happy flying a lot of vario machines as the majority of them ar left hookers.

I finally found a RHR scale machine and am happy with it, i can hover a LHR no problem but i still am not comfortable...

As said prev it is all in the head LOL, but it does feel different or quesey as Gimbal said, even on a model,
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02-26-2010 12:55 PM  10 years ago
Solmanbandit

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Tucson , AZ

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Quote
The real reason why real helicopters rotate counter clock wise is because the pilot in command seat is on the right side so if you lose tail rotor the heli will start rotating clock wise so you will be able to see out of the window.
That’s what designer’s hade in mind, Some manufactures follow this rule some don’t.

My comment was based the above quote. The Bell Jetranger is flown from the right seat, the MD500 is flown from the left seat, both rotor systems rotate the same way. So the above comment is out the window, so to speak.
I think you missed out on the last sentence where he said "Some manufactures follow this rule some don’t."
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02-26-2010 04:17 PM  10 years ago
dhc8guru

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Fort Worth, Texas

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Couldn't the engines work the other way around ? We have engines occasionally start backwards...?
As mentioned port timing may have to be changed and also sometimes pistons are offset to the connection to the rod to help drive more power. So if you run it backwards, the engine wouldn't be as powerful but it would still run.
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02-26-2010 04:22 PM  10 years ago
cdrking

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Seattle

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I highly doubt the reason for certain rotation is because of tail rotor failures. You can see just fine out of the window if you have a tail rotor failure sitting in either seat. I doubt this is the reason for direction of rotation.

I think this whole discussion is getting a bit muddled because some are talking about full scale and some are talking RC.

Jeff
To hover is divine, the alternative is rather PLANE.
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02-26-2010 04:23 PM  10 years ago
Billebob

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It's like (but unlike) flushing a toilet in either hemisphere, it doesn't matter which way the water spins. All you need to know is 5hit stinks, water runs down hill and it all comes out the pipe the same. Varios for example run different to the most popular direction and will take many popular engines.

bb
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02-26-2010 04:58 PM  10 years ago
jschenck

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La Vista, NE.

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I'm pretty sure that with some engines you can get a crankshaft timed to run CCW, used mostly for scale twin fixed wings. Could do that with our heli's too along with flipping the one-way clutches. Engine clutch would be a real problem though as I don't think they'd work as well spinning with the shoe leading.

I have heard that those who fly full scale Russian airplanes have to get used to stepping on the left rudder pedal on the takeoff roll. That'd take a bit of getting used to when you are so used to stepping on the right peddle for take off and climb. Same concept here. when you punch out and the tail swings the wrong direction you might get into trouble if you were not expecting that.
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02-26-2010 05:13 PM  10 years ago
cdrking

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Seattle

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Russian airplanes have to get used to stepping on the left rudder pedal on the takeoff roll
I think it would be just like going back and forth from a US Helicopter to European, just keep the nose straight.

I had to use full rudder a couple of weeks ago on a crosswind takeoff, it gets your attention when you hit the stop.

Jeff
To hover is divine, the alternative is rather PLANE.
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02-26-2010 05:19 PM  10 years ago
nivlek

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Norfolk England

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I had to use full rudder a couple of weeks ago on a crosswind takeoff, it gets your attention when you hit the stop.
That sounds a bit scary , can't you bump the headspeed up ?
At the end of the day , it gets dark .
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02-26-2010 05:38 PM  10 years ago
whirlyspud

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USA

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The rotation only bothers you the first couple liftoff's. After that it is no biggie.

Another funny thing I have noticed with opposite rotation. If you let someone else try it that is not used to it, the better a pilot they are, the more it seems to bother them. Just a funny quirk.

Mike
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02-26-2010 06:47 PM  10 years ago
11290

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Evansville, IN and Orlando, FL

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All you need to know is 5hit stinks, water runs down hill and it all comes out the pipe the same.
You missed the MOST IMPORTANT thing that you need to know to be a plumber, all of the above PLUS:

THE BOSS IS ALWAYS RIGHT !
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02-26-2010 06:51 PM  10 years ago
neilg.

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north of borston

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because clocks go in that direction, I.E. clockWISE ?
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02-26-2010 11:26 PM  10 years ago
GimbalFan (RIP)

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Big Coppitt Key, FL

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I had to use full rudder a couple of weeks ago on a crosswind takeoff, it gets your attention when you hit the stop.
Lemme guess -- fenestron tail? EC130?
op-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-t
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02-26-2010 11:35 PM  10 years ago
cdrking

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Seattle

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Nope, it was in this: Falcon 50EX

When I flew helicopters running out of "pedal" was very common in certain situations. The older Jetranger BII's with the 62" tail rotors were notorious for this.
To hover is divine, the alternative is rather PLANE.
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02-26-2010 11:55 PM  10 years ago
GimbalFan (RIP)

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Big Coppitt Key, FL

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Nope, it was in this: Falcon 50EX. When I flew helicopters running out of "pedal" was very common in certain situations. The older Jetranger BII's with the 62" tail rotors were notorious for this.
Aha -- a plank.

I'm acquainted with a number of pilots who fly both AS350's and EC130's in and out of Grand Canyon. The company (Sundance) is slowly transitioning to the EC130's and the pilots (every one of 'em) are not thrilled -- cuz on windy days at max gross, especially in mid-summer, the 130's apparently can be quite a handful (footful?) compared to the 350's while below the canyon rim.

Grand Canyon micrometeorology can push the 'comfort' limits in EC130's.

Fenestron tails are quieter and safer, but in my mind the 'cost' is high.
op-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-t
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02-26-2010 11:56 PM  10 years ago
Wimbledon99

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UK

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Why clockwise rotation ?
Why not
3D?? No - just another input error!!!
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02-27-2010 12:14 AM  10 years ago
cdrking

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Seattle

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Yep when you have a relatively ineffective tail rotor system you have to fly them like B-52 bombers, big square patterns and in to the wind.

I also used to fly a MD500E with a 4 bladed tail rotor. When it came time to do a pedal turn in a hover at max weight and with a wind you had to increase the hover height and then as you were lowering the collective to return to original hover height you would complete the pedal turn. It was very crappy when you were hitting the stop all day.

Jeff
To hover is divine, the alternative is rather PLANE.
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