Outrunner Motor Timing Q's - Page 3

scalefreak · 08-22-2008, 01:09 AM

	Quote: Originally Posted by migerthepimp
	thanks alot!

No problem

:edit: I love this stuff!

aryajet · 08-22-2008, 08:30 PM

Question if im not getting ideal low to half throttle response from an axi 4120/18 on a 15x8 xoar, 77a spin esc, 25c 3700 evo 6s batt.

low to mid throttle it seems lacks luster so to speak. half to full is amazing performance.

would i benefit from advancing my timing a few degrees?

amir

scalefreak · 08-23-2008, 11:10 AM

	Quote: Originally Posted by aryajet
	Question if im not getting ideal low to half throttle response from an axi 4120/18 on a 15x8 xoar, 77a spin esc, 25c 3700 evo 6s batt. low to mid throttle it seems lacks luster so to speak. half to full is amazing performance. would i benefit from advancing my timing a few degrees? amir

Probably so. Do you have the Spin Box? If so, make sure your throttle curve is linear and not logarithmic. PWM should be 16KHz. The timing for the larger AXi's (41xx-53xx) needs to be 22-24 degrees, also.

aryajet · 08-23-2008, 02:57 PM

I do have a spin box, I will check the setting and advance timing a few degrees and see what happens. Thanks for your input!!

FG NOOB, AND I NEED HELP!!! LIPO HELP!!!

Could you see that link, its another issue I have that needs some professional assistance!!! Thanks again!!!

aryajet · 08-23-2008, 03:08 PM

...

tailwheelteacher · 08-23-2008, 06:49 PM

	Quote: Originally Posted by scalefreak
	What are your options for timing advance?

im sorry for the late reply, i thank you for your help, my options are 1,7,15 and 30

scalefreak · 08-23-2008, 09:37 PM

	Quote: Originally Posted by tailwheelteacher
	im sorry for the late reply, i thank you for your help, my options are 1,7,15 and 30

Try the 7 setting and see what happens. I'm experimenting vicariously through you

scalefreak · 08-23-2008, 09:38 PM

	Quote: Originally Posted by aryajet
	I do have a spin box, I will check the setting and advance timing a few degrees and see what happens. Thanks for your input!! FG NOOB, AND I NEED HELP!!! LIPO HELP!!! Could you see that link, its another issue I have that needs some professional assistance!!! Thanks again!!!

Right on, I posted a few ideas that may or may not help.

Let me know how it goes.

aryajet · 08-24-2008, 11:30 PM

	Quote: Originally Posted by scalefreak
	Right on, I posted a few ideas that may or may not help. Let me know how it goes.

Ok, I connected my spin box and advanced my timing (2 deg) from 24 deg - 26 deg. And I got the exact performance I want. From low to mid its responsive and fluid, and from mid to high it stayed the same. So all is well and I get great performance through the throttle's motion.

But (theres always a but) will advanceing my timing to 26 deg negatively affect or hurt my power train (can,esc,batt)???

Thanks to all the help I recieved, scalefreak especially you

!!

Amir

scalefreak · 08-25-2008, 12:09 AM

	Quote: Originally Posted by aryajet
	Ok, I connected my spin box and advanced my timing (2 deg) from 24 deg - 26 deg. And I got the exact performance I want. From low to mid its responsive and fluid, and from mid to high it stayed the same. So all is well and I get great performance through the throttle's motion. But (theres always a but) will advanceing my timing to 26 deg negatively affect or hurt my power train (can,esc,batt)??? Thanks to all the help I recieved, scalefreak especially you !! Amir

Right on, Brother! 26 will be good. The AXi's like it up in the top end. I'm glad I could help.

wingster · 08-25-2008, 12:47 PM

Try inverse exponential on the throttle. I usually set mine at about 30%. Without this the lower third of the throttle does very little.

aryajet · 08-25-2008, 05:01 PM

	Quote: Originally Posted by wingster
	Try inverse exponential on the throttle. I usually set mine at about 30%. Without this the lower third of the throttle does very little.

I have a Futaba and I did that, I tried putting in enough expo to get the throttle going but advanceing the timing gave me a more linear response. Although what you mentioned does in fact get the prop spinning earlier in the power band.

It was working for my for a while, but with 1600W on a 6LB airplane the exponential revealed itself where low band torque effects should have been null, my plane was torque'ing hard in harriers and hovers, (tendency to snap in a harrier).

Thanks!!

Amir

08-22-2008, 08:30 PM	#26 (permalink)
aryajet HIGH AoA Join Date: Feb 2007 Location: H Town, TX Age: 27 Posts: 41	Re: Outrunner Motor Timing Q's Question if im not getting ideal low to half throttle response from an axi 4120/18 on a 15x8 xoar, 77a spin esc, 25c 3700 evo 6s batt. low to mid throttle it seems lacks luster so to speak. half to full is amazing performance. would i benefit from advancing my timing a few degrees? amir __________________ "Faith is the great cop-out, the great excuse to evade the need to think and evaluate evidence. Faith is belief in spite of, even perhaps because of, the lack of evidence." -- Richard Dawkins

08-23-2008, 02:57 PM	#28 (permalink)
aryajet HIGH AoA Join Date: Feb 2007 Location: H Town, TX Age: 27 Posts: 41	Re: Outrunner Motor Timing Q's I do have a spin box, I will check the setting and advance timing a few degrees and see what happens. Thanks for your input!! FG NOOB, AND I NEED HELP!!! LIPO HELP!!! Could you see that link, its another issue I have that needs some professional assistance!!! Thanks again!!! __________________ "Faith is the great cop-out, the great excuse to evade the need to think and evaluate evidence. Faith is belief in spite of, even perhaps because of, the lack of evidence." -- Richard Dawkins

08-23-2008, 03:08 PM	#29 (permalink)
aryajet HIGH AoA Join Date: Feb 2007 Location: H Town, TX Age: 27 Posts: 41	Re: Outrunner Motor Timing Q's ... __________________ "Faith is the great cop-out, the great excuse to evade the need to think and evaluate evidence. Faith is belief in spite of, even perhaps because of, the lack of evidence." -- Richard Dawkins

08-25-2008, 12:47 PM	#35 (permalink)
wingster Flyin' Around Join Date: May 2007 Location: springfield, ma Posts: 12	Re: Outrunner Motor Timing Q's Try inverse exponential on the throttle. I usually set mine at about 30%. Without this the lower third of the throttle does very little.

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