Replies to This Discussion

Permalink Reply by Jeff Smith on August 16, 2012 at 6:37am

I will try using the sonar as-is with a plate to angle it and the sonar the same angle as the APM to at least not have a default ~10 degree tilt in the mix by mounting it parallel to the bottom of the heli.

Gotta spend less time reading and more time playing, haven't even taken the 2.5 out of its antistatic bag yet :-)

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Permalink Reply by Kranston Kincaid on August 16, 2012 at 8:56pm

Well guys tomorrow I will join the test group. The APM 2.5 will finally arrive. I'm excited to play with this thing and hope I don't have build a quad to use it. Its going on a Raptor 50 that is tuned perfectly with no servo trims and will hover in one place with no input for about 20 seconds. So off to the races. From what I'm reading, i should not use 2.7.1, correct?

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Permalink Reply by Jeff Smith on August 17, 2012 at 5:35am

I don't know that there is a problem in 2.7.1 as *I* am flying it without issue... but, it seems that I am the only one?

P.s. I think you will have less issues starting with a well tuned heli, that is the next goal for me once I move over from the 2.0 to the 2.5 (hopefully this weekend). I just need to sort out how exactly to bypass the stabilization and use just the CCPM mixer as this is a function in the APM, not the radio now. My 600 is flybarless though, so I don't expect to have a 20 second run with no input though, very impressive. I never seem to have that little wind where I am :-) I've always been curious how it will fly with no assistance.

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Permalink Reply by malcolm churn on August 18, 2012 at 1:40am

Just arrived at the field and about to test 2.7.1, I have adjusted the pid's in stab mode to try and recreate the same movement the swash has on my flybarless controller (CGY750), it's an idea stolen from Robert :), I have a feeling that by removing all the I and IMAX, the helicopter can't get back to level, small amounts of mechanical play in the swash plate, servos, ball links etc. It's only a hunch, and I thinks well worth trying. Also it's has made the swash movement a lot smoother on the cylic. Will report back in an hour or so.

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DeveloperPermalink Reply by R_Lefebvre on August 19, 2012 at 10:52am

Malcolm, yes, this is something that I have suspected.  When I first discovered the effect of Iterm and how I needed to Zero it, I questioned whether maybe it was a difference between Flybarred and FBL.  I suspect it could very well be true that flybarred helis need zero I term, and FBL needs non-zero.

You won't be able to do quite what I showed you with my Acro mode hack.  I created a special "leaky integrator" in that code, which is not in 2.7.1 yet.  I thought about pushing it, I think it's fairly straight forward, but since it hasn't been flown much...  I did fly it a bit, but not a lot because of the problems with my 450.

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Permalink Reply by Perecastor on August 18, 2012 at 5:13am

Hi every one!

I have a little question .

Did you keep your gyro on your helicopter or you just use the apm gyro ?

I 've bought a TREX250 and there isn't many place in.

So if i can fly without my crappy gyro ( assan ga 250 ) i will be happy ^^

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DeveloperPermalink Reply by Randy on August 18, 2012 at 5:34am

Perecastor,

     I've left my external gyro on but some fly without.  Interesting that you're trying to get it working with a Trex250.  I've also recently tried putting it on this tiny helicopter but I've had some mechanical issues with my tail prop so I haven't had any successful flights yet.

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Permalink Reply by Perecastor on August 18, 2012 at 6:16am

So you made some flight without your external gyro?

You have a FBL system isn't it ?

Is it a problem if i have a fly bar system ?

Can you give me your pid seting ?

I have some problems to with my tail prop.... but the faut of my problem is maybe the servo tail...

it's not a brand news copter. I bought my trex with cheap gyro and ultra cheap servo...

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DeveloperPermalink Reply by Randy on August 18, 2012 at 7:09pm

No need for an FBL system if you're using arducopter.

Flybar system is ok, but it'll cause you trouble when it comes to doing loiter i believe.  That's my experience with the trex450 anyway.

When it comes to the pid settings..it's the rate settings that you should concentrate on.  I.e. Rate Roll, Rate Pitch, Rate Yaw.  I don't have my settings around at the moment but you can tune them in the air using channel 6.  My guess is they will be close to the 450s.

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DeveloperPermalink Reply by R_Lefebvre on August 19, 2012 at 10:48am

Randy, Rate?  Did something change?  Used to be Rate did nothing, and Stab was the thing to use. 

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DeveloperPermalink Reply by Randy on August 19, 2012 at 7:04pm

Sorry, Robert's right of course.  I've been spending too much time in multicopter-land where rate is the thing to tune.  In the helicopter it's stab roll and stab pitch.  If you're using an external gyro for yaw it's stab yaw...if you have no external gyro then you should tune rate yaw.

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Permalink Reply by Perecastor on August 20, 2012 at 5:47am

Tahnks a lots both ^^

I try this when it will be ok...

I broke the landing gear yesterday  :/

Luckly, i just broke the landing gear lol those thing fall very faster with the nagative pitch lol

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