Hunter-Vtail: Need to get APM2 to work on this V Tail frame

The Hunter-Vtail 500mm frame, available from, is constructed in black G10 and uses aluminum standoffs. It uses an unusual arrangement of motors, with which "the yaw autority is not only managed by the torque of the motors, back motor are producing a vector of thrust that push the tail of the copter one side or another, so it move really fast. Another great thing is, the center frame go way in the front allowing you to place a camera to fly FPV or film a HD image ( such Gopro camera ) that will not see propeller !" [sic]


It should be noted that the vendor recommends the use of the Rushduino Flight Control board, and this frame and configuration has not been tested with APM yet.

Selling at $95 Canadian, maybe some members would consider buying some of these for a developer or two who might consider spending some time working out APM support for this frame? Any volunteers for either role (donating frames, coding/testing APM support?)





Views: 6744

Comment by Robert Sinclair on June 14, 2012 at 9:01pm

So other than looking bad ass what would the benifits be? Just the Video LOS?

I'm thinking the Vtail allows for a sort of Tri-Config/balance?

I am curious if a mixer between the rear motor and servo, of a tri, to the two motors of this V would be possible...  

Talking myself through it:

Using a basic vtail mixer with a TRI copter config, motor 3 and with servo


Motor signal = elevator

Servo = rudder

Outputs: Left & Right of the V = Left and Right motors.

I've convinced myself its worth a try, On the "list" now

Comment by Greg Fletcher on June 14, 2012 at 10:14pm

It's all just vectors and forces. Work out the math and do the motor controller. Way cool.

Comment by Greg Fletcher on June 14, 2012 at 10:17pm

Very good yaw response. Poor efficiency.

Comment by yovio on June 14, 2012 at 10:37pm

I've done a code changes for this frame but don't have the frame to test.

From what I understand the changes is not much, its almost like a X quadcopter, differences are:

1. Front motors no longer involved in yaw movement

2. Back left motor will rotate the copter in CCW direction (reversed) using thrust and not torque and Back right motor will rotate the copter in CW direction.

I'll post the codes and propose the changes to dev team when I'm able to test it.

Comment by Crispin on June 15, 2012 at 12:18am

That does look like a nice frame. Deff on my shopping list :)

Comment by Max Yeo on June 15, 2012 at 12:29am

My friend's use KKplus controller board everything works nicely ......

Comment by Rob_Lefebvre on June 15, 2012 at 6:18am

I think that's a great looking frame, and seems to fly pretty well.  I also really like the POV for a camera.  The only way it could be better is if there was an integrated camera mount/gimbal.  I'd seen one a while ago where they built a pitch gimbal right into the front of the frame.

I'll do the program if somebody wants to send me a setup.

Comment by Ellison Chan on June 15, 2012 at 7:17am

Loss of tail lift, due to the angles of the tail would make this thing significantly less efficient than a plain quad, I would think.  That crossbar in the tail is definitely needed to keep the tail motors from sagging, and over time might loosen up and cause misalignment and doesn't look like it will survive a mild crash.

Comment by Rob_Lefebvre on June 15, 2012 at 8:00am

The efficiency loss is probably around 15% total.  Not the end of the world IMO.

I base that on Cos(45) is 0.70, so they downward component of lift is only 70%.  So a 30% loss on 2 out of 4 motors, so 15% overall.  If the angle of the tail was only 30 degrees instead of 45, you'd still have tons of yaw authority, but also only lose about 7%.

I have been thinking about making a hexa v-tail with two close-set motors on each forward arm.  Of course, the big problem with this is, if it's one of the tail motors that goes, you pretty much lose yaw control, so it really defeats the purpose of using a hexa.

Comment by Ellison Chan on June 15, 2012 at 8:25am

That might be a bit off.  Since you're get 70% lift on the back motors only, that means you'll be capped at 70% for the front motors as well, to maintain level. 

Personally, I think that any time you start angling the motors for yaw, you might as well just go to with the traditional heli design, and use one large rotor and a small tail rotor.  You'll get more efficiency from the larger main rotor blades.


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