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Old Jan 30, 2002, 08:03 PM
Dandi6065 is offline
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V tail vs. Conventional tail.


V tail vs. Conventional tail.
I have built the Bug from the RCM issue, and was wondering about adding a conventional tail, so I can use it with a standard TX, without mixing. Itís an older Attack 4 Am.
Can anyone tell me the difference in the two types of tails, and the different performance?
Thanks
Dave
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Old Jan 30, 2002, 08:27 PM
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v tails are lighter and have less drag. but


they have some inadvertant elevator effect when used as rudder and vica versa. They are harder to set up to correct angle of incidence. They need a computer radio. On the plus side they are out of the wing wash. They survive landings well. They can be made to break down nicely. They wont get snagged on brush.
Old Jan 30, 2002, 11:57 PM
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V-tails also reduce weight and drag (lower wetted area). There is no "elevator effect." There are many small, inexpensive v-tail mixers that go inside the model, so you don't need a computer radio. Setting up a v-tail is no more difficult than a standard tail. It just looks different.

Q
Old Jan 31, 2002, 02:55 PM
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... and some aileron wing V tail models have elevator-only, which needs no mixing at all (and saves the weight of a servo).
Old Jan 31, 2002, 03:54 PM
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Scroll down the page and read The Great V-Tail Debate." Lots of good information.
Old Jan 31, 2002, 03:56 PM
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Additionally, if you accidentally snag a wing while landing (a common occurrence for me), the V-tail will lift up as the plane swings around, thereby saving your fragile tail feathers.

Lee
Last edited by chlee; Aug 16, 2007 at 01:06 PM.
Old Jan 31, 2002, 04:03 PM
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... but in a hard landing a V tail can sometimes fracture at the root as it's not as strong as a continuous 1-piece tailplane. Easy to fix though!
Old Jan 31, 2002, 04:39 PM
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In my opinion the main advantage is that they don't get caught on objects when landing.

Kevin
Old Jan 31, 2002, 06:54 PM
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but they look silly....
Old Jan 31, 2002, 07:11 PM
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Quote:
Originally posted by tic
but they look silly....
..no they don't; they look cool!

One question though; I understand that there shouldn't be any 'elevator effect' when rudder is applied, but doesn't the mere fact of having one up & one down just increase drag?

tim
Old Jan 31, 2002, 07:24 PM
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Probably no more than having one aileron go up and one down! I think a single surface would need more movement to get the same response.
Old Jan 31, 2002, 08:17 PM
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How comes we don't see more V-tails on realscale planes? the Beech bonanaza comes to mind.. nicknamed " the doctor killer" the FAA eventually put speed restrictions on the plane
Old Feb 02, 2002, 03:32 AM
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V-tails have the same amount of drag as a conventional tail. T-tails have the least amount of drag because they have half the amount of junctions as a conventional tail meaning less interference drag. Since the vertical fin is capped by the horizontal stab and elevator, the vertical fin can be smaller because it is more efficient. Also T-tails tend to be in undisturbed airflow allowing for smaller horizontal components. This is a simplification and assumes that the respective tails are designed properly.

V-tails looks sleek and are great on slope soarers because they keep out of the grass on landing and are light weight so allow for overall lighter structure. This also holds true with TD sailplanes except a flying stab on conventional tail gives much better response at low speeds with out any elevator/rudder "coupling" . The T-tail is somewhat impractical on TD sailplanes due to complexity and weight. Also, since the launch method is typically a winch, the high angles of attack during launch usually blanks out the tail for the first part of the launch resulting in a positive pitch movement in the sailplane.

In an electric, because the weight is concentrated in the nose, the T-tail makes a good choice both structurally and aerodynamically. That isn't the whole explanation but it is a start.
Old Feb 02, 2002, 07:06 AM
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A good summary, Sal..
..a
Old Feb 02, 2002, 09:39 AM
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Wow thanks all


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