Motor Timing tutorial for Actro 32-3

[FrittsLogic]

I've moved my Ion pieces parts around between the two I own. Addicted to tinkering I am. Anyway, I noticed on the Actro 32-3 (95T main gear) bird, that below about 1650 rpm or so, it vibrates quite a bit. I'm guessing pole slippage bewteen the motor and stator field. Then at higher speeds, vibes go away and it sings sweet and pretty! (must be working as a synchronous motor at this point). Obviously motor characteristics are different between the Actro outrunner and the stock Hacker on my other Ion. Both are running on stock Hacker 77-o-H's with identical settings, per suggestions I've read in this forum (0 deg timing, 8khz switching). I've violated the conventional wisdom on the Hacker/Hacker combo by using THR curves below 80% (actually more like 65-70%) and it's been working great!! 1650rpm and esc about 115F after 10 minute flight.

So what I want to know is how motor timing affects motor performance, and ESC performance at a variety of head speeds, and any thumbrules or guidelines you veterans know from real world experience.

Any thoughts would be greatly appreciated, Don.

[ChrisS]

You can up the timing on the Actro and it will respond with a bit more power but also more heat. Frank Koehler recommends against doing this as the motor is running too inefficiently. You can do this with the Hacker too, but you will likely not see much payoff above 10 degrees, I've not tried that. This with the 77-O control.

I have personally run the 77-O controls at very low speeds for quite a while just to see what long term effects it would have on them. So far so good, even down to 50%. BUT, I only do this to hover around with. My intent was to try to get a two speed setup for the contest guys and it seems to work fine.

If you try to pull back the throttle too far and then fly hard, you will see elevated ESC temps.

As an alternate, if you use one of the decent governed ESC's, like the Kontronik or Schultze, you CAN get away with hard flying and reduced throttle percentages. After seeing what Bert is doing with the 55 amp Jazz on the MXR, I believe it would work in an Ion for pretty much any setup and flier except the most violent. The Jazz is a very, very good control...I wish they made it just a tad bigger.

Chris

[misskimo]

hey , last year I was tinkering with low throttle setting , well since my schulze 40-160 has to be in airplane mode , on my 14s Ion last year, I went to 70 % , and I flew it hard as it would let me , any other controller would have poped. off of the 2 7s4p 5300s I ran them for 12 mins of flying mildly aggressive. one think I notice when running a low throttle curve with a big ESC, the heat went to the batteries . my batteries came down pretty warm , and also puffed one pack . I do like going down lower in the throttle curves , one good thing with the schulze , I can run idle 1 at 97% Vcurve , and idle 2 100 , and flip through the 2 and here the difference , the have and the kontronics , you have to go lower. kontronics from what I expirenced , around 68% on your throttle setting would be like 85% actual

[rfaster]

Good inf0 -

Chris - so an Ion-X running a 10S you think the Jazz 55 would be fine for sport flying - mild 3d? I'm using a 55 on a 30 size E and love the slow start and GOV - Kind of sick waiting for the powerJazz.

[misskimo]

it will work , just try to use it above 85% wich is actually on the radio around 68% on the throttle,

[FrittsLogic]

Well I think I'll just have to try the 55-10-32 out then. Pull it off the Lepton where it's overkill, and make it earn it's keep on the big bad Ion. I'll put a temperature probe on it and log it during flight with the MicroLogger and do some kind of test flight program to see how far it really can go. I just need it to handle Sport Flying profiles. Thanks for all the thoughts on this.

So to summarize on the timing angle, more gives more power, up to a point, and at the cost of motor heat? And it helps low turn outrunners like the Actro, but not so much the higher turn inrunners like the stock Hacker?


Thanks again, Don.

[rfaster]

Fritts - look forward to seeing your results on the Jazz 55 -