View Full Version : Bi-Copter
12th February 2012, 11:23 PM
This is what I want next, a bi-copter!! You know the avatar like flying copter. This guys seems to be making kits http://www.gressaero.com/, I haven't been able to find the buy button yet :)
I want one, it super sexy and it looks like it flies great too, it looks like a winner in my book.
What do you think? Do you know of a place to buy such a kit? :)
Make sure to check VRWolf's build thread (http://fpvlab.com/forums/showthread.php?3537-Bi-copter).
13th February 2012, 12:51 AM
I saw this company last year and they had a 450 size kit. Not sure what happened to that
13th February 2012, 02:12 AM
This guy's got it going on.
13th February 2012, 03:14 AM
I noticed too that his sales pages seemed to have vanished, you could always send Gary an email (Gress Aero)
Building my own personally, proving to be quite the learning experience :)
Design ended up half way between a scorpion and bell's eagle eye.... 12 inch props on it (to give a size referance)
initial flight testing
13th February 2012, 07:46 AM
Flite test built one of these and reported it had terrible pendulum effect and was hard to control. Might be better off with putting an extra fan in the rear for stability control.
13th February 2012, 08:16 AM
Indeed, it does have pitching issues and wobles forward and back. I was told instead of using a standard kk board flashed for twin to use a MultiWii setup with accelerometer. I've seen them fly really stable that way. I was getting frustrated with mine on a kk board setup and had a few flip over's as a result. soon I hope to put the multiwii in and see how it goes from there. I have a couple minor repairs to do first and possibly reverse molding the body to make a fiberglass one to make it a little lighter and stronger.
13th February 2012, 10:45 AM
The Avatar one had some pitch oscillations too if you watch closely. Adding a rear fan sounds interesting, but I wonder if collective pitch with governed head speeds on each rotor would smooth it out? Would be more complex for sure, but it would reduce lag in gyro/control requests for a change in direction. Could happen fast enough with CP to end up being smooth.
13th February 2012, 10:46 AM
I think if they're describing it as: "Simplest, stablest, swiftest VTOL" then maybe they should try to do something besides hover around in circles. IMO, a bicopter should be paired with a set of wings and 90 degree pivots to make a V-22 Osprey style craft.
13th February 2012, 10:47 AM
The latest issue of Heli Pilot magazine had an article on the new V-22 Osprey that's out now. Like $1300 bucks for body kit and electronics with custom gyro mixing board.
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