I have been thinking about something like this a lot recently too. Here's a suuuuper rough ms paint schematic:



This is basically T6's idea I think. The red squares are switches; switch 1 is the trigger and switch 2 is the cutoff lever. Switch 2 is closed by default, and switch 1 closes when the trigger is pulled. When the cutoff lever is activated, switch 2 opens the circuit so the motor temporarily stops. The trick is, when the cutoff lever comes back, you don't want the circuit to close again.

Kjones, is there some kind of gate that will only become true once switch 1 is opened and closed again? If so, that should allow semi-auto to work.

Quick edit for detail:
I've done a bit of looking online for components (disclaimer: I have basically no experience with electronics) and I found some micro push buttons that could work since they're the right size. However, they can only handle around .2 amps, which is bad. Luckily, with a mosfet the switches shouldn't be getting a lot of current, right? Most of it goes through the fet I think, but actual quantities are important here. Also, I don't know how mechanically reliable those microswitches are (the Ares microswitch trigger was notoriously unreliable if I remember right).

Double edit because I read more of the thread:
I don't think an arduino would be good for a final version because they are a bit too big to fit in a gearbox, but maybe you could design a PCB that fits? The arduino would be great for prototyping the software though. Obviously a fully Computerized integrated fet is possible (spectre) but that kind of takes the cheap and simple part out of the whole concept. In my opinion, a combination of simple electrical switches and the existing mechanical parts would be ideal. That way you improve the normal AEG trigger, but you don't have to worry about sector gear sensors and microprocessors.

Example A of why face protection is important: http://www.miairsoft.org/index.php?topic=634.msg3661#msg3661

What hydro pouch do have on the back? I need something that compact.

I've thought about airsoft drone usage quite a bit, ever since I saw a related thread on airsoftmechanics a while ago. I fully support the use of drones, whether they're normal planes or quadcopters. However, ff they can't shoot at infantry, players shouldn't be able to shoot at the aircraft IMO. Maybe just have a capturable SAM site as an area denial for the drone, if it actually has strategic significance. Either that, or you just have to hide in the woods where the drone can't see you. Honestly, I don't think a drone should ever be shot at, because if you do take it down, you have just created the biggest possible aircraft-related safety hazard (having it falling onto somebody).

When you get down to the technical aspect, I think a long-endurance plane would be much more practical than a quadcopter, for the simple reason of operating time. There's a reason that Predator drones are fixed wing aircraft rather than x-copters. Of course, any sort of aerial recon has the potential to be super cool and add a lot to a milsim experience.

As a side note, the airsoftmechanics thread I referred to was actually talking about airsoft air support, in which the aircraft would actually be armed. Now this throws a whole bunch of new aspects to discuss, but I think figuring out the gameplay mechanics of a simple recon drone would be a good start.

Did you buy it used or new? It could just be a wire blocking the trigger or something.

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Krylon and Rustoleum both have a camo series of spray paints that are perfect for airsoft.

^ I think I was just reading a similar post by you on ASF. I personally don't do anything airsoft related on FB, and I'm definitely in the "pro forum" camp (that doesn't mean I'm anti Facebook though— it's a different communication platform with a different purpose for me). I don't go on the forums much anymore; MiA has always been my home forum and it just isn't very active usually. Once I got an account on ASF, I was a little overwhelmed because it's such a big forum relative to ours (it has a great commerce section though). I don't spend enough time posting to really make a name for myself, but I still think the forums are a better community. Airsoftmechanics is also a good one, although it can be intimidating to post there as a new member.

As a side note, I think the Round Table is a great idea, because it will help keep actual forum discussion alive. The majority of posts nowadays seem to be in commerce and event related threads.