I have just bought the ArduPilot Mega 2560 Full Kit... plus the Triple Axis Magnetometer HMC5883L. I should have it built over the weekend.. then i'm off to a my mates machine shop, and i'll make the splitter plate for the lower frame onto which i am going to fit the Ardupilot. the magnetometer i'll put on the tail as suggested. I am going to use my X-cell Razor 600E. For those that dont know its around the 50 size nitro heli.

Do i need to buy any other sensors i.e. the Sonar... i can fly a helicopter all day long but this is my first time flying one with stabilisation so any tips would be gratefully appreciated.

If this works well then i am going to try and use it on my x-cell gasser. i can get up to 20 minute flights with this. But i think for the time being a battery 600 is the way to go.

i'll post some pictures when i have it all together.



Setup Instructions

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Next noob question regarding the camera. I've seen the 3DR pitch/roll gimble, but I was wondering if there's a good setup out there that will let me swing the camera around and use the camera to track ground coordinates all Predator style. If anyone knows anything small enough to go on the TRex, that's the next direction I plan to go.

Hi chris, My APM is directly under my rotor shaft and have had no issues. But my GPS is mounted out on the tail and the mag on the horizontal Stab. I did have my GPS under the main blades, but then a few people were talking to me about multipathing, although i never really had a chance to test that. I moved mine to give the GPS the best chance possible. The mag if its near the main motor or lipo then you will need to move it, or at least test it thoroughly . Also make sure that what ever you mount it on is solid.

There is no way of searching the thread/discussion which is a shame.

Correction.  There is no good/effective way of searching. ;)

You can search in the forum, but not by thread.  And when you search in the forum, you are not guaranteed to actually find all the results you should.

Chris, go to page 84 of this thread. There you see my 450 setup. I mounted the GPS almost into the shaft ;) Kidding. But it is totally close and with wooden blades, I have no issues with the GPS. The mag is more sensitive. Although I wonder how the GY401 gyro works in HH mode. It should have a mag as well? And it sits much closer to metal and all the electronics.

No, I really doubt a HH gyro has a mag.  They just have REALLY good accelerometers/gyros and a dedicated I/C that does nothing but try to hold the tail.

I'd like to see some examples of how good a HH works so I can compare how I've got mine now.  It's very good.  At least as good as the Flymentor I had.

I have just finished building my gas helicopter about a 90 size. I'm going to put my spare apm on it, wire all the sensors in, but not the servos, i'll use my flybarless controller CGY750, but i'll use the adapter and Y lead the from the Receiver. This way the APM will get all the inputs as i fly around, but will have no control. Its just a way of judging how the APM will put up with a spark ignition single cylinder engine at 9000rpm. I can then data log it, what should i be looking for in the Logs to see if the DCM is getting into trouble?

I flew again tonight, this time with 2.5.1.

The Loiter is much better, and does not take off on a mission due to a bug.  I still haven't got it holding stable yet, and I think it's mostly to do with the fact that my heli doesn't fly level, so it always starts off loitering by going to the left and forwards (due to an aft CG and tail rotor thrust).  I need to figure out how to level it better.

But, overall, this code is really really good.

So nobody liked my "Weathervane" code idea from page 117?

Sorry Robert missed you weathervane comment, Your right thats how the old rate gyros worked which was good if you were flying fast forward, as you say the tail would in the end line up. But i believe most people have learnt to fly by feeding in tail as well as aileron. But would it possible to have a switch, to go from Rate to HH? just like most gyros do. 

Yeah, I was thinking it could be a Ch7 option.  

I think it would be a feature that scale guys would like.  Or even just sport fliers.

How are you getting on with your APM tail gyro? Is it as good as an external HH gyro?

We've got an issue describing something very close to what you're describing.  In this suggestion it's an extensino to simple mode so that if you command the roll or pitch to be over x degrees it turns to point in the direction you're commanding.

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