V-tail design questions.

[dockman]

Okies, I am working on a v-tail design and have been trying to figure one thing out without success.  Motor placement!  I have looked over god knows how many v-tails to try and get an idea on how to space my motors to get good results.  Best pic I have found was of one of the Dialfonzo hunter v-tails that puts the back v-tail assembly centre line at the radius the front motors are from the flight controller board.  I have included the pic in case my description isn';t clear to all.



Any input on placement and spacing of motors from those that have built v-tails would be appreciated. 

[guest325]

I built one not so long ago, it turned out to be a bit heavy for acro which was what I wanted but is nice and stable and would make a good camera ship. If you were to make it substantially lighter it would be good for acros!
http://www.multi-rotor.co.uk/index.php?topic=3887.0
If you want any further info on what I did just ask.

[Biffa]

Here are some pics of mine.

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If I am honest I never put any thought into motor placement or design at all - I just built it with bits and bobs and from my head. The only specific part is that the motor angle is at 40 degrees which seems to be the optimum and the peoples choice.

As you can see, it also flys reasonably well in the video below:

http://youtu.be/zLY44g1WPkE

[Riggsbie]

Looks damn fine to me !

[dockman]

Thanks for the responses guys. 

Next challenge is to come up with a way to make the v-tail I am happy with out of G10.  This is where I wish I had a CNC, still cutting this stuff by hand  ::)

[guest325]

Biggest thing you need is patience, and being analytical about what you are doing, I did a hell of a lot of research before I made mine - and still made it too heavy, mostly down to me wanting it to be reasonably crash proof.

[dockman]

Yeah I have been toiling over this for well over a month and have gone through many designs and even made a bit of a prototype.  If I cant get the accuracy I want out of the G10 for the v-tail portion I might just go for a small quad.  One way or another I am going to use the motor mounts I got from teslahead, I have already made a quad out of them but I am dead set on trying to make a v-tail.

[guest325]

I know exactly where you are coming from, I tried the V tail route to get a better yaw response but and it is a big but, do you really need it? The way I hoon about with my Crius 450 quad I';m no longer really convinced, there again I';m no real acro flier!  I think the main reason for me having a go is the sense of adventure - I was dead chuffed when it would actually fly!
Don';t give up on an idea that at some time in the future you might regret not having a go at!

[dockman]

I might end up looking for someone or someplace that can CNC the frame for me, I have the material already.   The prototype v-tail assembly I have already made has to many parts is to heavy in my opinion. 

I am a bit of a perfectionist so if a part I hand cut isn';t damn near perfect it tends to get scrapped.  It dose not help that I can tell when something is as little as 1mm off.

I have however come up with a nice quad design that I might give a try in the mean time while I work on the v-tail.

Here is a pic of where the teslahead motor mounts are currently.