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ModeratorPermalink Reply by John Church on July 27, 2010 at 5:12pm

Are your ESCs setup to recognize full throttle endpoints? (ESC calibration done?) Anything getting hot?

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Permalink Reply by Jerry Chapman on July 27, 2010 at 5:33pm

Nothing getting hot. I'll try calibrating the ESCs again. Do you think the weight is ok?

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JDronesPermalink Reply by Jani Hirvinen on July 27, 2010 at 6:13pm

Yes tryo to calibrate your ESC's again. That weight should not be a problem. Most of quads are around 800g - 1.3kg. What is Kv amount on your motors??

Especially if you have used it before with AeroQuad software, you need to calibrate ESC's. We have been having some problems when jumping AQ calibration to AC. This is due AQ used min throttle of 1100 to start engines and AC uses 1040. There are few other issues also with this.

And it is still work on progress tho r55 in repository is working ok but still be carefull always with repository code due there might be big bugs lurking around. We are updating it almost daily.

Onlly tested and accepted software gets to ZIP files.

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Permalink Reply by Jerry Chapman on July 27, 2010 at 6:41pm

The motors are rated at 950kv. I'm re calibrating as we speak. Thanks.

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JDronesPermalink Reply by Jani Hirvinen on July 27, 2010 at 6:44pm

ok.. those should lift easily quad of your weight

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Permalink Reply by Jerry Chapman on July 27, 2010 at 8:06pm

Calibration is completed but same results never got loose off the skids. I'm at 4500ft but that shouldnt matter. What RPM should those props be spinning? I can measure the RPM and AMPS with my data logger. What timing should I set in the Turnigy ESCs?

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JDronesPermalink Reply by Jani Hirvinen on July 27, 2010 at 8:48pm

that's odd?? Ok you are rather high but not that high anyways. Calculating your props/motor maximum RPM is rather simple.

Kv * Volt * efficiency = Max RPM. So 950 * 11.1 * 0.9 = around 9500 RPM

Timing is just normal timing as it comes out from factory. Quads does not need any special settings.

Just as a stupid question, are all motors spinning on right direction eg. 50% CW, 50% CCW and props mounted correct location.

How it was when you did fly with AeroQuad? It worked ok?

And another Q, what electronics you are using?? APM + OilPan or AeroQuad shield + Duemilanove/Arduino Mega

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Permalink Reply by Jerry Chapman on July 27, 2010 at 9:20pm

+ frame
Front Motor - clockwise - regular prop
Rear Motor - clockwise - regular prop
Right Motor - counter clockwise - pusher
Left Motor - Counter clockwise - pusher

Using APM + Oilpan

First quad that I have had.

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Permalink Reply by Jerry Chapman on July 28, 2010 at 8:14pm

I'm drawing 65amps when trying to take off.

JC

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JDronesPermalink Reply by Jani Hirvinen on July 29, 2010 at 1:34am

65 Amps ?!? That sounds a lot. I just tested one of my test ArduCopters. It has T-Plush 18amp, TowerPro 2410-8T mots and GWS HD-9040 3 blade props.

It was getting up around 10.5-12 amps. And in generally 3 blade props takes even more power than 2 blade.

So there is definitely something wrong on your setup. Either your motors are broken or weight is way more than 1.2Kg. I have not measured that my test copter but I'd say it's around 1Kg

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Permalink Reply by Jerry Chapman on July 29, 2010 at 9:15pm

Well, the motors are rated at 14amps. When I measured at full throttle they drew 65amps and 8 seconds later down to 60amps. Doesn't this mean the motors are doing all they can?

The weight is 1.245Kg or 2lb 12oz. This is on my postal scale, its really quite accurate.

My hunch is that the motors just plain suck! I picked up the quad and had another person run the throttle, I dont feel that much airflow and not much pulling. When I would go full throttle on a .40 nitro motor with a 10x6 prop you had to hold on to that plane. BP says that motor should be good for 34 oz plane, times that by 4.

Whats the best way to troubleshoot this further? The weight is verified, dont know the prop rpm, I cant imagine the ESCs being bad(maybe bump the timing, poles = 14), The props are correct. Any Ideas?

JDronesPermalink Reply by Jani Hirvinen on July 29, 2010 at 10:09pm

Do you have an access to IR led's and IR receivers? and having an extra arduino board lying around? That way you could easily build small RPM measurement unit to look how those props are actually spinning.

Have you ever been flying that quad earlier with AeroQuad or any other software?

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