Hunter-Vtail: Need to get APM2 to work on this V Tail frame
The Hunter-Vtail 500mm frame, available from QcRc.ca, 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?)
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Comment by Bertrand Duchiron on June 15, 2012 at 9:34am -
Why not bigger propellor and / or more powerfull motor at the rear to compensate the loss ?
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Comment by Ellison Chan on June 15, 2012 at 9:48am -
Bigger props and motor does not address the efficiency loss. The loss is due to the two back motors needing to basically loose 30% of it's power to provide yaw, as R_Lefebvre calculated. You waste that power even when you're holding yaw, as opposed to a traditional quad. In the trad quad, when not yawing, you divide the power equally between motors, and all that power is providing lift.
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Comment by Max Yeo on June 15, 2012 at 10:01am -
The tail angle are 40 degrees ...
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Comment by Ellison Chan on June 15, 2012 at 10:10am
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Ok, 24% lost power intead of 30%.. ;-)
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Comment by yovio on June 15, 2012 at 10:11am -
Initially I also though about loss of Thrust from the back motor, but if you guys look at properly, the CG is more to the front part, so we mount APM2 on the front side. I've look at Multiwii code and the vector ratio for Aileron and elevator is the same like X Quad.
Here is the codes includes Y4 motor patch, the code has not been test cause I don't have frame, Max Yeo too busy to come to my place to test.
I can't attach file in blog comment so I post the file to my blogs.
In Summary the motor patch is same like Quad X, except:
1. Front motor not involve in YAW
2. Back Left motor make CCW yaw and Back Right make CW YAW.
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Comment by Max Yeo on June 18, 2012 at 2:21am
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So how can I upload the file ???
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Comment by Todd Spurgeon on August 13, 2012 at 12:40pm -
Do you know how much this frame weighs? I am currently designing my own v tail copter, hopefully with a 130 degree angle between the two tail motors. I was running the numbers on the parts I have already decided on and needed numbers on the frames mass to estimate my max flight time and payload capacity.
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Comment by Mickey Allen on December 27, 2012 at 12:44pm
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Where can you buy this frame?
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