I have a terrible memory for names and faces, so it wasn't all that surprising that when I introduced myself to Gab707 at this year's NYCDFF Day of Drones, he had to remind me that we met at that very spot last year. In my defense, he wasn't THE Gab707 at that time. In the intervening year he'd become quad-famous, landing a spot on DRL as well as creating a beautiful video that went viral in the real world, not just our little drone world.
We had a real nice chat, during which the physics major schooled me on some quad flight misconceptions. It may be bruising for the ego to be proven wrong, but it's great to learn new things.
And so it was that much more rewarding when Gab wrote to tell me how much he liked the Odonata, and would like to have one to shoot smooth but gimbal-less videos. I sent him the last remaining prototype and eagerly waited to see what he'd do with it – there literally wasn't a better person for it.
When Gab wrote back a month or two later he had a huge list of suggestions (he'd also hacked up my beautiful baby). I initially declined since the mods were too much work for a frame that I didn't think anyone else would want, but as we discussed it more I got increasingly intrigued by the challenge. His wish list was as follows:
Fpv cam has to have a unobstructed view even at 0 degrees of tilt. The GoPro would be at 0 degrees or even be tilted down most of the time. It's a video rig, not a freestyle rig like Odonata.
Flaco style arms for max efficiency, attached with just two bolts.
No pdb: either use an aio fc or 4 in 1 esc.
Little or no camera protection. As a video rig it should almost never be crashed, so lose the cage.
My first thought was to put the fpv cam next to the GoPro, a la the TBS Discovery. But unlike the Discovery, the cam would be in the same mount as the GoPro so that it could match its angle to give the pilot the best sense of what the GoPro was shooting. This would also center the GoPro lens on the frame. Additionally, the fpv cam would be allowed to pivot within the mount in case you wanted to fly with a different angle than the GoPro. And of course, both would have unobstructed views at all angles.
6x6mm Flaco arms are really strong when you build the frame stock. Add a Session with the Zoompod and the arms break more often. My guess is that with the weight of this frame and greater length for 6" props, the arms would have to be at least 8x8. The three pronged GoPro mount is 15mm tall, so with a 2mm mid plate and a 3mm bottom plate, a 10x10 arm would fill that space perfectly. It might be overkill but I think it's a good tradeoff for strength and vibration resistance. The motor mount area will be milled out to 4mm to save weight.
With no cam protection, the nose of the frame would simply taper down to the GoPro mount, a sandwich of the mid and bottom plates with a 3d printed piece in the middle.
With such unusual proportions the frame was a bit tricky to draw up, and the result is just plain weird, but with a peculiar charm. The reason for its name should be obvious...
The very first flight was taken with the fpv cam at 0 tilt and the GoPro pointed slightly down, what I assumed would be a typical filming setup. As soon as it took off I freaked out. I'd been flying for so long with 45 degree tilt that 0 just felt wrong now. With the quad level throttle was way jumpier, and with roll and yaw reverted to their natural axes things just felt...weird. I quickly landed it and gave the fpv cam some tilt, after which it flew like a normal quad. I'd been messing with the pt1 filters and the quad flipped out on a flip, going into a death roll and a hard crash. The cam mount broke, as did the two main body plates, the consequence of using super strong 10mm arms, I guess.
I was using the GoPro tabs for the mount, but in reality you'd never use a GoPro accessory. I changed the three flanges to a solid tab, which should be much stronger.
And here it is built up.