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Model Forum / Radio Controlled / Helicopters / October 2006[Q] Heli tail rotor direction T-rex vs. the real thing
I've noticed that the T-rex and most model heli tail rotors are on the starboard side of the aircraft. Nearly all pictures of a real heli I've seen are on the port side....why is this? Thxs > I've noticed that the T-rex and most model heli tail rotors are on the > starboard side of the aircraft. Nearly all pictures of a real heli I've seen > are on the port side....why is this? > > Thxs I'll take a guess and say that it has something to do with the direction of rotation of the main blades. Looking at few Russian helicopters the tail rotors are on the opposite side to US helicopters and the ones that are different their main blades rotate the opposite directions. I don't no the reason for this but its a interesting topic. Cheers >> I've noticed that the T-rex and most model heli tail rotors are on the >> starboard side of the aircraft. Nearly all pictures of a real heli I've [quoted text clipped - 11 lines] > > Cheers it looks like Richard hit the nail on the head, all the photo's I have of full size the main rotors go anti-clockwise and my t-rex and Nexus go Clockwise and it must be more efficient for the tail to blow into thin air rather than blow onto the boom >> I've noticed that the T-rex and most model heli tail rotors are on the >> starboard side of the aircraft. Nearly all pictures of a real heli I've [quoted text clipped - 6 lines] > of > rotation of the main blades. More likely to be something far less sinister than that:-) The early Cobra's (as an example) from Bell had the tail rotor on one side, but it was flipped during the re-modelling to (IIRC) the "Whiskey" model to the other side This had the added effect of changing the rotation direction, but was tthat the reason? Some say yes it was, others say no it wasn't. There's always been the issue of which way the tail rotor rotates (low blade moving forwards or low blade moving backwards), but that's as definable as anything else in helicopters. There're sound reasons why one way is better than the other ON PAPER, but it doesn't translate well to the real world, although the biggext differences between model and full size IS thew direction of rotation. Models generally have the low tail blade moving forwards, while full size don't. Looking at few Russian helicopters the tail > rotors are on the opposite side to US helicopters and the ones that are > different their main blades rotate the opposite directions. > > I don't no the reason for this but its a interesting topic. I doub there IS a reason.  SignatureBeav VN 750 Zed 1000 OMF# 19 >>> I've noticed that the T-rex and most model heli tail rotors are on the >>> starboard side of the aircraft. Nearly all pictures of a real heli I've [quoted text clipped - 30 lines] > > I doub there IS a reason. I would tend to agree, but, from what I've read through the years, at least among the modeling community, it's generally thought that a pusher configuration of the tail rotor is more efficient than a tractor configuration. Also, having the forward half of the tail disk rising into the main rotors downwash is considered better than having it go the other way. Why the full size birds are setup they way they are may be decided by nothing other than the parts inventory that's on hand when the bird is being designed. I've flown models with tractor and pusher tailrotors and the tail disk itself spinning in either direction. For normal flying around, I couldn't tell any difference. They all worked. The top pilots in the world, flying their hard core 3D maneuvers probably could but beyond that, I don't think I'd worry about it! FWIW! :-) Fly Safe, Steve R. >I would tend to agree, but, from what I've read through the years, at least >among the modeling community, it's generally thought that a pusher [quoted text clipped - 10 lines] >world, flying their hard core 3D maneuvers probably could but beyond that, I >don't think I'd worry about it! Yep, I think so too.... Depends on what parts/designs are on hand.. Look at the R44 and R22. Both are pushers, but they spin opposite directions... I asked the guy teaching the maintenance part of the factory course about that and he said it had something to do with the configuration of the tailrotor gearboxes. As long as the TR's got enough authority to handle the requirements of the ship, it's good enough for me. >>>> I've noticed that the T-rex and most model heli tail rotors are on the >>>> starboard side of the aircraft. Nearly all pictures of a real heli [quoted text clipped - 36 lines] > configuration of the tail rotor is more efficient than a tractor > configuration. That may have been the case when thevertical stabs were gigantic buildings:-) Now though, they're nothing more than skeletons, so I don't think it makes a bit of difference. Also, having the forward half of the tail disk rising into > the main rotors downwash is considered better than having it go the other > way. I DO like that, I have to say. Always have. > Why the full size birds are setup they way they are may be decided by > nothing other than the parts inventory that's on hand when the bird is > being designed. I'd like to think so, but the manufacturers probably have a million "reasons" why they are how they are. I've flown models with tractor and pusher tailrotors and the tail > disk itself spinning in either direction. For normal flying around, I > couldn't tell any difference. They all worked. Indeed they do. The top pilots in the > world, flying their hard core 3D maneuvers probably could but beyond that, > I don't think I'd worry about it! Nor me. SignatureBeav VN 750 Zed 1000 OMF# 19 |
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