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HelicopterMain Discussion › technical question
03-12-2003 04:33 PM  14 years agoPost 1
Jamovich

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Bangalore, India

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How come we mostly see 2 blade R/C helis, and not 3+ blade ones? And what is the advantage to the paddles? (real helis don't use them).


I think a scale Hokum R/C heli would be awesome! (the one with 2 rotor heads on top of one another)

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03-12-2003 04:38 PM  14 years agoPost 2
Obsessive

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41.73N 71.41W

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Basically, at the scale of our models, 2 blades are more efficient

There are 3 and 4 blade scale choppers. The swashplates and heads are of course different.

Flybarless model helicopters do exist; they just don't respond quick enough. 3D would not be what it is today without flybar/paddle arrangements.

Besides, the cost of 2 pairs of V-Blades after a mishap! UGH!

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03-12-2003 04:59 PM  14 years agoPost 3
Jamovich

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Bangalore, India

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hmm

So if a full scale helicopter, which had a high power to weight ratio, with similar concept of flybar/paddles, would have increased response and superiour acrobatic capability?

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03-12-2003 05:30 PM  14 years agoPost 4
rockier

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Las Vegas

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Yes, but you would have to take in account that the material made the big would not hold up.

------,\\\|///,-----
___*| # # |*
oo0---(_)---0oo

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03-12-2003 05:39 PM  14 years agoPost 5
JCadwell

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Richland WA/ Morro Bay, CA

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There aren't many two bladed full scalers out there since the blade loading is so high. The other compelling reason is because of blade length on a full scaler. You don't want to run the tips of the blades over the speed of sound, otherwise you get a standing shock wave at the place on the span where the speed is at the speed of sound. The flybar increases stability, and acts as somewhat of a gyro. But it also teeters. This is somewhat undesireable on a full size as it changes the "predictability of the blade path, especially for someone wanting to walk up to a running heli. On our models it increases the frequency of control inputs. This is not nescessary on the full size due to the increased number of blades. As usual, there are plenty of exceptions, and these are just generalizations.

Thanks, John Cadwell

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03-13-2003 12:43 AM  14 years agoPost 6
BQuick

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Staatsburg, NY

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Actually, without the flybar, reaction is TOO fast. As stated above, the flybar acts as a kind of gyro and adds stability. It also makes for a more predictable roll rate since the heli can't roll any faster than the flybar will roll.

With multiple blades, you pretty much have to go flybarless since it would be very difficult to have one perpendicular to each blade.

- Brad

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03-13-2003 12:59 AM  14 years agoPost 7
Obsessive

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41.73N 71.41W

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Bquick - Excellent catch; I said it backwards. The flybar slows the response to a controllable and predictable level.

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03-13-2003 02:21 AM  14 years agoPost 8
d-n-jensen

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Bellevue WA

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You must remember that you can scale a heli down to our size but you cannot scale down the air molecules that keep it in the air. The dynamics of this is why we use different control systems. If a full scale heli could get the power to weight ratio we have in our models and could handle the stresses we do in 3D flight the pilot would be reduced to a small pile of goo in the back of the cockpit. Needless to say the main rotor blades of any full scale heli would be blown apart attempting a Curtis Tail Slide.

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03-13-2003 02:30 AM  14 years agoPost 9
Gary Jenkins

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Nowhere, US

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KISS. Is why we fly with 2 blades.

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03-13-2003 04:09 AM  14 years agoPost 10
Dyehard

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Cedar Bluff, Va.

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Jamovich, there is one full size heli that uses flybar paddles, the Hiller Raven. That just might be the reason that we call them Hiller paddles.

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03-13-2003 05:51 AM  14 years agoPost 11
Jamovich

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Bangalore, India

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hmmm

It is barely full scale =P


Does it fly well?

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