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What are the advantages & disadvantages of using Elevons & Flaprons

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Old 05-08-2007 | 05:30 PM
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Default What are the advantages & disadvantages of using Elevons & Flaprons

Hi there all,

I read in some thread of the beginners that while flying the basic trainer what is the use of rudder, it is used at the time of landing, ground steering/taxiing and line the aircraft. Somebody mentioned to use rudder while you are making a right or left turn with ailerons. Is it necessary to use rudder while using ailerons, and ofcourse elevator is used as well to maintain the height.

Now the question arises mixing of elevator and aileron become Elevon which mostly computerised Tx are capable of doing that, similarly mixing of flap & aileron become Flapron, so what is the advantages and disadvantages of Elevon and Flapron. Are these important to use being mixed in Tx. And one more thing what is V-tail mixing. As I have JR's XF421EX so I would like to know the clarifications of these.

Once again I came up with questions which I need the answers and I really appreciate you people's patience to reply me and enable me to enhance my info with your precious experiences & feebacks.

Thanks

Mody
Old 05-08-2007 | 05:53 PM
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Default RE: What are the advantages & disadvantages of using Elevons & Flaprons

Elevons are used mostly in tailless airplanes, flying wings and delta wing aircraft.
Flaperons can be used in normal planes but separate flaps are more desirable for slow landing approaches. Sailplanes use flaperons to give the wing a variable camber. Flaperons down a few degrees for a cambered wing for maximum lift when slowly circling in a thermal and reflexed up a few degrees for low drag and high speeds when blasting through a region of sink or penetrating a headwind.

On a beginner's trainer, there's no reason to fool with these things.
Old 05-08-2007 | 05:57 PM
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Default RE: What are the advantages & disadvantages of using Elevons & Flaprons

Well your idea of what Elevons are is not quite right. If you are familiar with delta wing aircraft such as the Park Zone Stryker they use elevons. They are a mix of elevator and aileron for aircraft that do not have a traditional elevator where the main wing provides all horizontal stabalization. Typically these aircraft only have Elevons and throttle control however some have rudder. I refer to them as "bank and yank" flyers
Old 05-08-2007 | 06:28 PM
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Default RE: What are the advantages & disadvantages of using Elevons & Flaprons

If you watch some modern fighter aircraft such as the F-18 you will see the tail feathers wiggling all over the place. They use a version of elevons called tailavons. Using the elevators to assist/boost the roll rate. It also helps if part of the control system is blown off.

This is a V=tail
http://www.beechcraft.org/vtail/p711lb/711lb.html
Not as strong as a conventional tail and many crashed due to tail failure.
Old 05-08-2007 | 06:33 PM
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Default RE: What are the advantages & disadvantages of using Elevons & Flaprons

Good point Bruce, I am in the Air Force and should have remembered that one... Hmm How bout thrust vectoring like my new F-22 Well I can't even afford a turbine for one of those let alone the semi elaborate set-up it would take to make T/V usable in R/C.
Old 05-08-2007 | 06:34 PM
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Default RE: What are the advantages & disadvantages of using Elevons & Flaprons

Thanks B.L.E., Mr.Stang and Bruce for your replies[8D]

Mody
Old 05-08-2007 | 07:17 PM
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Default RE: What are the advantages & disadvantages of using Elevons & Flaprons


ORIGINAL: Mr67Stang

Good point Bruce, I am in the Air Force and should have remembered that one... Hmm How bout thrust vectoring like my new F-22 Well I can't even afford a turbine for one of those let alone the semi elaborate set-up it would take to make T/V usable in R/C.
T/V? already being done by the turbine boys. A friend of mine has it on his Rookie. Works good.
Full-scales have it too like the Sukoi's (spelled wrong I know). T/V and tailavators.

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