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HelicopterMain Discussion › Purpose in life of a stabilis(z)er?
12-01-2007 07:54 PM  9 years agoPost 1
wlfk

rrVeteran

uk

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The vertical stabiliser obviously stops the tail rotor from striking the ground.

But do either the vertical or horizontal stabilisers have any aerodynamic function? On my T-Rex 450 they have been cutout to the extent I can't imagine they do much - except cost me money when they break!

Or was I meant to put stickers on them, like you do for some paddles?

K

A bit like a kite, but 500 times more expensive

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12-01-2007 08:03 PM  9 years agoPost 2
george0079

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USA

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The stabilizers actually do alot in FFF.

Hell... I can fix that.
Uh oh..
Nope.
It's ***ked!!!
RE-KIT!!!!!

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12-01-2007 08:05 PM  9 years agoPost 3
wlfk

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uk

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Wotabout FRF? Presumably they just make the beastie even less stable?

K

A bit like a kite, but 500 times more expensive

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12-01-2007 08:05 PM  9 years agoPost 4
dannyh5

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England

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If they have been cutout they are 3D fins and are for orientation only. If they are not cutout, they have aerodynamic properties, lateral and longitudinal stability.

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12-01-2007 08:44 PM  9 years agoPost 5
SSN Pru

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Taxachusetts

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If they have been cutout they are 3D fins and are for orientation only. If they are not cutout, they have aerodynamic properties, lateral and longitudinal stability.
Ditto, the fins on your trex are for tail rotor protection and orientation. They also wreak havoc on poorly setup or lower grade tail server/gyro combos when in backwards flight...

Stupidity can be cured. Ignorance is for life!

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12-01-2007 08:55 PM  9 years agoPost 6
wlfk

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uk

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Hmm...

I've been thinking about doing away with the horizontal stabiliser altogether. It just gets hit whenever I have a boom-strike - even a relatively tiny one. Whereas the vertical stabiliser almost never gets bust.

It's not that I crash too often now, but it seems a shame to spend money on parts that are primarily cosmetic. Yet it also seems a shame to fly around with broken bits of C/F on the heli - which I've been doing for several weeks now. I wish you could buy packs of just horizontal stabilisers.

K

A bit like a kite, but 500 times more expensive

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12-01-2007 09:03 PM  9 years agoPost 7
pchristy

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Devon, England

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On a full size, the vertical stab is usually offset somewhat to relieve the load on the tail-rotor in forward flight. This makes eithr more power available to the main rotor (better altitude or speed) or reduced fuel consumption.

The horizontal stab usually has an inverted aerofoil section, and applies "up elevator" with incresing speed. I believe this is to discourage over-speeding, and the risks of retreating blade stall. (Helis stall by flying too fast, unlike a fixed wing, which stalls when flown too slowly!)

Models have them largely for cosmetic reasons, and to protect the tail rotor. I've never noticed any significant difference flying without them - except in the early days before gyros, when the fin helped to damp out the tail rotor response a little!

--
Pete

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12-01-2007 09:58 PM  9 years agoPost 8
patriot21

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Byron,MN

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yep... it helped me get my heli back to me when my rudder servo linked popped off... i started flying sideways and got the heli to weather vane towards me

My Sponsor:VISA

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12-02-2007 12:35 AM  9 years agoPost 9
RotorRage

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Lake Charles, La.

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I learned to fly helis without a gyro. In a hover the vertical stab isn't worth much but in forward flight it does alot to keep the tail in check. My heli was actualy easier to turn without a gyro.

A friend will bail you out of jail. A real friend sits with you in the cell saying"That was awe

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