quick motor question

[anthony1]

i am running the scorpion msh 3s motor in my mini protos with an edge 50 esc , its in governor mode and i have 3 headspeeds setup 2900, 3000 and 3100, i tried 3200 but was hitting 100% a lot so backed it back down to 3100, but so far i've mostly been flying in iu1 (3000) and putting back around 1700 mah in my 2200 packs, i tried 3100 today and surprise surprise it flies nicer but also using less mah i'm putting back around 1500, am i missing something, i flew 3 times this afternoon 2 flights at 3100 and 1 at 3000, all 3 flights were 5 minutes but i put more back in to the pack with the lower headspeed ?

[blade450]

An ESC runs more efficient if the power output is closer to 100%.
The lower you go, the more heat and inefficiency is generated.
Some ESC's will even go up in flames if you go too low for too long.
Not YGE though.

Sent from my iPad using Tapatalk HD

[stevebaker]

I presume it's more complex than that - I wouldn't have thought going higher and higher on the throttle would give better and better runtimes - I presume there is an optimal setting.
It was my understanding that lower headspeeds (even though not in the optimal range for the motor and esc) would yield bigger run times.
I'll have to have a play with some different headspeeds myself this weekend to see the effects...

As I have telemetry setup I can see exactly what happening re. headspeed and voltage. It's going to be important to use the same battery and fly the same routine each time.

[anthony1]

flew a couple more flights yesterday as a test ,iflew my regular pattern at iu2 and used 1500 to 1600 mah per bettery, flew a gentle flight in iu1 and used around 1300mah, so i guess its to do with how i fly, the 1700mah flight had lots of tic tocs and changes of collective so that must push it more at the lower headspeed because at the higher headspeed doing mostly tic toks i used 1600 ish mah, so iu2 from now on then

[blade450]

Glad to hear you got things figured out.

Sent from my iPad using Tapatalk HD

[stevebaker]

Well I flew two Turnigy 2200mAh 25C packs last night, one at 2950 rpm and one at 3050 rpm, both for 5 minutes flying a mix of light 3D and big air.
The flight at 2950 rpm took back 1280mAh and the flight at 3050 took back 1455mAh.

I'm really pleased with those sorts of flight times. I'd read before buying the heli that it was quite power hungry with everything getting a bit too hot on 3S - maybe I'm not flying hard enough, as everything is coming down 'slightly hot' for me and I would guess I could comfortably run for 6 mins.

Really glad I took plunge with this heli. I pondered over it for months before committing as I thought I was completely happy with the 300X, however, having flown this it makes the 300X feel really sloppy.

Next up 3200 rpm.

[stevebaker]

Here is a log of my latest runs using stock 3S motor, 16T, Turnigy 25C 2200 mAh cells, Turnigy AE45 ESC in gov mode.
A mix of light 3D and big air flying.



The second run at 3200 rpm definitely consumed more battery power as you would expect. It took back 1570mAh.

[desertstalker]

Originally Posted by stevebaker

I presume it's more complex than that - I wouldn't have thought going higher and higher on the throttle would give better and better runtimes - I presume there is an optimal setting.

Of course, lower throttle increases power losses in most ESCs, but reduces power use in the motor, overall this results in less current draw, but a hotter ESC. So you get longer flights at the cost of more ESC heat, and possibly killing it.

[dr dremel]

Originally Posted by desertstalker

Of course, lower throttle increases power losses in most ESCs, but reduces power use in the motor, overall this results in less current draw, but a hotter ESC. So you get longer flights at the cost of more ESC heat, and possibly killing it.

That being said: I mostly fly @ 65% throttle with the stock 3S motor and while the esc comes down really hot I never had a shutdown or temp warning on the YGE even in the most hot summer weather (38degC/100F).

But yes, the math unfortunately does not work like 65% equals 35% longer flight time.

[anthony1]

another few flights today all in iu2, 1 flight was soft around 1300mah added the other wasn't and I put in around 1800mah so I guess its how I fly determines how much I put in to the packs!

[desertstalker]

Originally Posted by dr dremel

That being said: I mostly fly @ 65% throttle with the stock 3S motor and while the esc comes down really hot I never had a shutdown or temp warning on the YGE even in the most hot summer weather (38degC/100F).

But yes, the math unfortunately does not work like 65% equals 35% longer flight time.

The YGEs are not like most escs, if you have active freewheeling enabled (and you should) it is much more efficient at partial throttle than other ESCs.