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HelicopterMain Discussion › Tail rotor rotation
10-20-2009 11:56 AM  8 years agoPost 1
Mike545

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gettysburg, pa

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whats the reason for the particular rotation of the tail rotor, cw vrs. ccw?

"always feel thankful..... never entitled"

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10-20-2009 01:03 PM  8 years agoPost 2
ShuRugal

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Killeen, TX

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tail rotor needs to rotate so the advancing side is up under the main rotor wash, otherwise the main rotor wash would subject the tail rotor to retreating blade stall.

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10-20-2009 01:50 PM  8 years agoPost 3
Mike545

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gettysburg, pa

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thanks, I thought there was some science to it.

"always feel thankful..... never entitled"

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10-20-2009 04:28 PM  8 years agoPost 4
BarracudaHockey

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Jacksonville FL

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Thats the reason most full scales work that way. For us it really doesn't matter.

Andy
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http://www.jaxrc.com

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10-20-2009 09:57 PM  8 years agoPost 5
helicraze

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Victoria - Australia

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Take a look at the henseleit rigid it goes down into the rotor wash. Jan says there is not much difference in flight.

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10-20-2009 10:07 PM  8 years agoPost 6
BeltFedBrowning

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Kansas City

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Converted my old Kalt gasser to belt drive tail and ran the blades backwards(with the rotor wash). The tail held just fine(no 3D)

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10-20-2009 10:29 PM  8 years agoPost 7
ShuRugal

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Killeen, TX

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*shrugs* so on a model it doesn't matter, tail rotates so much faster than the wash that retreating blade stall is not an issue. As barracuda pointed out, full scales go against the wash for that reason. From an aerodynamics standpoint, it's still a good idea to go against the wash, even if your tail rotates fast enough for it not to matter holding, going against the wash will give some extra kick when yawing against the main rotor torque.

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10-20-2009 10:44 PM  8 years agoPost 8
BarracudaHockey

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Jacksonville FL

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Yes and no.

Think about it, how many times do we fly our models in slow forward flight when the downwash cone is moving backwards and over the advancing tail blade?

Thats the only time any increased tail authority comes in, and considering the speeds some of us can do piroetting funnels and 100mph backwards hurricanes when the tail it out there on its own....

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

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10-21-2009 06:32 AM  8 years agoPost 9
ShuRugal

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Killeen, TX

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hehe, well, on my nexus, downwash is always going over the advancing side of tail rotor, 550mm blades are about 15 or 25 mm too long for this model, especially using the DF head...

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10-21-2009 08:15 AM  8 years agoPost 10
Aaron29

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USA

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Usually goes up into the rotor wash as stated.

Kind of hard to call it CCW or CW though. Which way are you looking at it? From the left it is clockwise. From the right it is counterclockwise.

I'm glad we never had to use the words CCW or CW in our answers because it all depends one where you stand. Literally.

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HelicopterMain Discussion › Tail rotor rotation
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