I am building my self a park flyer but I want to be a bit different.
I want to use a V tail but I never seen anythign other then a sail plane use it. Are these good designs? And if they are at which angle should the be in? Should it be more acute square or obtuse? Will this design make the rudder give a aileron effect to?
My next wing question is: If I make the wings in the shape of an F 16s, Can I have a dihedral to help make it more stable? Dose that design work well on a F16? Will it still go with the dihedrel?
My last question is: Will the following motor battery controler and prop work well? The motor had a built in esc and comes with a left rotating prop (pusher? i need one)
this is the battery specs
GR2522 8 Cell 500AR Nicad pack with MG-6
Conn. ..... $ 56.90
4.5 x 1.34 x 0.7", 5.6 oz
and the motors is
GR6084 SPEED 400 PLUS L, 6V SPEED 400L with Speed Control and Prop ...... $ 45.90
IN STOCK

Thank you guys a lot! I am new and I dont know what I am doing so I need as much help as possibal. If you can tell me some rule of thumbs to please.

A V-tail has one big advantage: You wind up with a net of one less tail surface, so you save weight

The biggest disadvantage is the complexity of the combined elevator & rudder control, but this can be solved with computer radio mixing or pre-packaged V-tail mechanical linkages.

Answers to your questions:

A 90 deg. spread is about right, as the elevator and rudder effects will be equivalent.

A rudder always gives some a roll effect (funny, I just posted on another thread about this), both directly and indirectly, but a V-tail will produce a relatively higher roll moment, which is in the opposite direction of its yaw induced roll. The more obtuse the V-tail, the greater the direct roll moment for a given yaw force. This all means that a V-tail will, with pure rudder input, roll a little slower as it yaws.

Dihedral will always help lateral stability, but the net effect is reduced with short, stubby wings, as the lateral moment of inertia is less.

Also, short, stubby wings (such as on an F-16) have a small wing area, so they need higher speed to fly- consider this when designing your plane. Unless your plane is super light, even by park flyer standards, you may not be able to fly it slow, and you better have the motor to move it fast.

I can't answer your questions on motor/battery/prop setup for two reasons- 1) I'm not very familiar with typical motor sizes for given plane sizes/weights, and 2) you didn't give your plane's estimated size/weight!

I agree with mulligan.

Two things - typically V tails are about 100 degrees spread, sometimes more, sometimes less. 90 will work.

Area should be about the same as the equivalent conventional tail (tailplane (stab) + fin ) combined.

There is evidence that V tails are bad at exiting spins as one of the surfaces gets blanketed.

I guess for the size and weight of a park flier this is not a consideration.

You are also meant to save drag with a v-tail - less interference drag and one less vortex than a conventional, though in practice I doubt it makes much of a difference particularly for the type of model you are making.

Speed 400 electric? well I'm no expert on electric flight, but I'd guess with that battery and motor combination you should be building around the 18-24 ounces mark with a wing area of 300-400 sq inches. Maybe a bigger wing area considering you are opting for a wing planform which has been designed for supersonic flight!!! (and will therefore be inefficient at the low speeds your plane will be flying). My guess is your flights will be radically shortened because of the drag produced by your wing planform.

For a first model, I would recommend you choose a wing shape less radical than that - you could always stick with the jet styling idea, just not a supersonic one...