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HelicopterAvant RC Avant Aurora - Mostro › Tail rotor on the "wrong/other" side?
08-11-2007 03:36 AM  10 years agoPost 1
n808

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Seattle, WA - USA

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I am sure Avant experts will laugh at this, but I was looking at the pictures of the Aurora in the new kit thread, and for a minute thought they were mirrored. Then I checked the Aurora model in RealFlight, and verified that the tail rotor is on the opposite side of the tailboom, relative to all other helis I have seen.

Is there a technical reason/advantage for this? On the other hand, is there a good reason for the other alternative? I apologize ahead of time if I missed something obvious somewhere.

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08-11-2007 05:12 AM  10 years agoPost 2
GimbalFan (RIP)

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Big Coppitt Key, FL

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With the extreme capabilities designed into models like this, any differences there might be in yaw and pirouette performance with the tailrotor on one side vs the other (push vs pull) must be so minimal as to be inconsequential.

The surprisingly simple explanation I heard about a year ago was, that with the tailrotor assembly on the left side, there's a bit more clearance between the tailrotor blade tips and the ground (when landing, etc), since this heli -- like all helis with a clockwise-turning mainrotor -- leans to the right in a hover.

Not sure if that's the only reason but it is a factor worth considering, since as everyone knows, hardcore 3D heli pilots can't land worth a Schlitz.

op-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-t

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08-11-2007 05:15 AM  10 years agoPost 3
shuttlepilot

rrElite Veteran

Mullins, South​Carolina

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XCells are on the other side as well.

Gas is Great
Camper Fuel is Better!!
QWW Helis

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08-11-2007 05:23 AM  10 years agoPost 4
GyroFreak

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Orlando Florida​...28N 81W

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Hey, I think I know this. Depends on the tail blade rotation direction. The blade closest to the main downwash should be turing up to gain a little free energy from the downwash.

Hey, that was what I was told !!!

I think about the hereafter. I go somewhere to get something, then wonder what I'm here after ?

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08-11-2007 05:28 AM  10 years agoPost 5
GimbalFan (RIP)

rrProfessor

Big Coppitt Key, FL

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You are correct, but forward upturning tailblades are possible regardless of left or right side tailrotor assembly positioning.

op-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-t

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08-11-2007 05:43 AM  10 years agoPost 6
GyroFreak

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Orlando Florida​...28N 81W

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Yes, but for torque tube configs this has to be designed in, you just can't flip the rotor to either side and always get forward upturning blades. So if I am correct (and I'm not always) during the intial design phase of a model the right/left side tail blade position is fixed by the final direction of the torque tube rotation, assuming it has a simple tail output shaft gear configuration.

I think about the hereafter. I go somewhere to get something, then wonder what I'm here after ?

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08-11-2007 05:45 AM  10 years agoPost 7
GimbalFan (RIP)

rrProfessor

Big Coppitt Key, FL

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Yup -- torque tubes have to be designed for it -- belt drives can be flipped.

op-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-t

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08-11-2007 05:48 AM  10 years agoPost 8
GyroFreak

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Orlando Florida​...28N 81W

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Yeah, I left belt drive out of my discussion since my brain has been boiled by the Fla heat, it was 102 today in the shade with very high humidity.
But now that I think it thru, that makes sense.

Paul

I think about the hereafter. I go somewhere to get something, then wonder what I'm here after ?

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08-11-2007 06:01 AM  10 years agoPost 9
Quickster

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Victoria, Australia

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Gyro Freak, I believe you are right! I had an Avant EFX and i replaced the belt drive with a freya tube drive conversion and it changed the direction of the tail rotor! I was a bit concerned about the tailblades no longer turning up into the main rotor wash, but as Augusto pointed out to me......when your inverted the tail is no longer in the main wash anyway!

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08-11-2007 06:04 AM  10 years agoPost 10
GyroFreak

rrProfessor

Orlando Florida​...28N 81W

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Yep very true. With gyros I doubt it makes any real diff anyway. hel#, my tailblades are so far out from the main rotor I doubt the downwash makes any diff !!

I think about the hereafter. I go somewhere to get something, then wonder what I'm here after ?

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08-11-2007 06:08 AM  10 years agoPost 11
n808

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Seattle, WA - USA

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thank you, it is all clear now (not entirely).

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08-11-2007 06:10 AM  10 years agoPost 12
GimbalFan (RIP)

rrProfessor

Big Coppitt Key, FL

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thank you, it is all clear now (NOT).
Do you understand why a heli leans in a hover?

op-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-t

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08-11-2007 06:19 AM  10 years agoPost 13
n808

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Seattle, WA - USA

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yes.

Just curious about the Avant design choices.

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08-11-2007 06:22 AM  10 years agoPost 14
GimbalFan (RIP)

rrProfessor

Big Coppitt Key, FL

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I'll bet a turkey shlub shlammich and a blig blag o' Fritos that Augusto or someone who knows the story on Aurora tailrotors will eventually chime in.

op-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-t

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08-12-2007 03:00 AM  10 years agoPost 15
MJHiscott92504

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James Hiscott ,​Germany for past 11​months

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What side should they be on?

Standing behind your clock wise turning main blade heli the tail rotor blades for best performance should be on the right side of the boom, this way the tail blades stay in uninterrupted cleaner air, Think about it....Jim

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08-12-2007 03:05 AM  10 years agoPost 16
DS 8717

rrProfessor

Here wishing i was​somewhere else

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Xcell put's them on both sides,the open gear box can be flipped over so you can use either side. In real world flying it doesn't make any difference for 3D,the FAI guys say it hover's a little better on the right side.

YOU ONLY LIVE ONCE..IF YOU LIVE IT RIGHT THATS ALL YOU NEED

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08-26-2007 07:37 PM  10 years agoPost 17
jal250r

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Mankato, MN, US

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On full size Helicopters the way the blades turn (clockwise or counterclockwise) seems to make a differince in what side the helicopter company puts there tail rotor on. Md 500 american made the rotor hub is on the left side. Astar eruo made witch the blades turn the other direction is on the right side. Thats all I know

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08-26-2007 09:07 PM  10 years agoPost 18
BarracudaHockey

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Jacksonville FL

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A. Thats not always true.

B. Full scale have a lot more design considerations than we do.

Andy
AMA 77227
http://www.jaxrc.com

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