I'm really interested in your project.
I have been looking at frames for a while now and decided to use the HT-FPV frame and APM2. I don't have much experience...hold on...I don't have any experience but your project is exactly what I want to do. Lucky I stumbled across your post.
I don't understand the reason for the adapter board as far as connecting to the frame.
Looking forward to your update.
The reason for the adapter is that the APM2 has a hole spacing that doesn't match any of the holes already built into the HT-FPV frame, and I didn't want to drill additional holes. You could double-sided tape the APM2 onto the frame, but I also wanted a solution that didn't involve tape and also provided the appropriate circuitry to let me select which ESC I wanted to use to power the APM2 without needing to actually cut wires on the ESCs.
The adapter board mates with the APM2's hole spacing and then provides a 45x45 and 60x60mm hole spacing which fits nicely onto the mounts available on the HT-FPV. It should work fine for other frames, too.
I've got two of the adapter boards spare (I was sent three), so if you want one, PM me and I'm sure we can work something out :)
EDIT: First flight went fine - no issues. Needs some PID tuning, but other than that, everything went great. Flies quite nicely, very responsive, and altitude hold works great. I'll be testing loiter this weekend.
What is your AUW?
Flight weight is 1792 grams. That's including a 406g battery and ballast equal to a 200g Go-Pro. Which means AUW with a real GoPro and FPV transmitter should be under 2kg.
Do you still have any of these boards? I snagged your design and was going to order some but I don't need 3 lol. If you do I'd like to buy one from you.
I'm interested in how your boards work. I drew up a simple plastic mount that I was considering, just don't know what I need. http://www.shapeways.com/model/680410/ardupilot-mega-2-5-mounting-a...
Board works fine for me :) The idea is that the ground plane on the underside of the board helps damp any EM from getting to the magnetometer on the APM. The connectors allow you to split out the +5 volt lines coming out of the ESCs so you can provide just one to the APM (switchable by changing the jumper). I fitted my APM to the board with some nylon washers and nylon M3 bolts, but it's designed so the APM can be bolted hard to the board with no spacers (there are no tracks or ground plane on the side of the board facing the APM). You don't have to use the breakout pins on the board if you don't want to, but I've been seeing a lot of people recommending having only one of your ESCs supply power to the APM instead of having them all fight over it.
Hi HT-FPV guys!
I also have a frame like this, but i'm having problems with my parameters. Could you please share you parameters file with me ? :)
Haven't done a whole lot of tuning, I'm afraid. It's the middle of winter here, and I appear to be cursed with having every weekend being rained out :(
Yeah, I'm flying the APM 2 on the HT-FPV frame too , and she is weird. First hint is to uncheck the "lock pitch roll axis" box in the Mission planner setup. This is no ordinary, "square" frame with longer rear arms, and widely spaced, short front arms.
Still tuning myself, but always keen on hints and tips on this awesome, but peculiar frame!