How to set head speed?

raptor fan · Nov 02, 2009, 07:47 PM

If you dont have a tachometer,whats the best way to get your head speed the same throught the pitch curve.I dont have a tachometer and the head speed is a big part of getting the heli set up.Anybody got a good method of doing this? Thanks

jasmine2501 · Nov 03, 2009, 12:48 AM

When you go to fly, if your head speed drops you can hear it. You can adjust the throttle curve to try to compensate for that. I don't bother though - I just run 100% throttle all the time. You don't need to obtain a number for your head speed - just punch up the curve until it flies right.

raptor fan · Nov 03, 2009, 12:09 PM

You run the throttle 100% in each mode or just idle up?

jasmine2501 · Nov 03, 2009, 12:11 PM

Quote:

Originally Posted by raptor fan

You run the throttle 100% in each mode or just idle up?

What mode? There is only one mode... I don't use "funky mode" - but yeah you can figure out a curve for it, it's not going to give you constant head speed.

ewoodcox · Nov 03, 2009, 03:56 PM

Quote:

Originally Posted by raptor fan

If you dont have a tachometer,whats the best way to get your head speed the same throught the pitch curve.I dont have a tachometer and the head speed is a big part of getting the heli set up.Anybody got a good method of doing this? Thanks

You can calculate your top headspeed using one of the many headspeed calculator:

http://www.readyheli.com/Online_Head...lator_s/81.htm

I have found this useful once I calibrate myself to a know configuration, for instance my HB King II, flown it allot and so if it says more headspeed, I know it will be more touchy and powerful. Seems pretty close when I compare my different CP helis.

INPUTS: Battery type: LiPo LiFe (A123)
Configuration 20C
Number of cells: 3
Main gear teeths: 140
Pinion teeths: 9

Motor KV: (explain) 3900 kV
Motor efficiency: 85 (General: 85 outrunner, 90 inrunner)

RESULTS: Voltage for this calculation (avg):3,293/cell with a total of 9,879
Nominal voltage: Spoolup RPM 100% throttle no governor (11,1v): 2783
Avg RPM you will see with 100% throttle and no governor: 2498
Max normal bogging applied you will see RPM at: 2105
(this number should be the minimum if your motor & battery is up for the challenge)

Roto Rob · Nov 04, 2009, 04:04 PM

A governor is a good option for constant head speed.

raptor fan · Nov 04, 2009, 10:34 PM

Wow thats a cool website.You dont use goveners on electric helis do you? I thought they where only for nitros. So you dont have a stunt mode jasmine?

jasmine2501 · Nov 04, 2009, 10:40 PM

You can use a governor if the ESC has it, but I haven't had good luck with them. I only fly in idle-up stunt mode - I don't use weird mode

MikeyToo · Nov 05, 2009, 10:14 AM

Quote:

Originally Posted by jasmine2501

You can use a governor if the ESC has it, but I haven't had good luck with them. I only fly in idle-up stunt mode - I don't use weird mode

Interesting. How do you start up?

Jimmy Flyer · Nov 05, 2009, 11:28 AM

Basically you spool up then once its at RPM you flick the switch and it stays there til you land...

That's the one thing I learned after I got my TRex 250 Set the Thro Curve To 100% Linear and and it'll fly much much better even regularly, hoverings even that much better.

henryd123 · Nov 05, 2009, 11:29 AM

Quote:

Originally Posted by MikeyToo

Interesting. How do you start up?

with a decent esc with a good soft start I suspect

raptor fan · Nov 05, 2009, 01:12 PM

So you just keep the throttle curve at 100% And only adjust the pitch curve?Doesnt that make your head speed exsplode at 0 pitch?Ill have to try that .

jasmine2501 · Nov 05, 2009, 01:25 PM

Quote:

Originally Posted by MikeyToo

Interesting. How do you start up?

I just let the soft start do it. If you look here you can see, the throttle hold switch is the top left, and the 3-pos switch on the face of the radio is already down, in mode 2 (stunt mode) - I just wait for the ESC to spool it up, then I go.

Bonus with this video too... a nice crash

Trex 500 Backwards Flight Fail - crash! (3 min 23 sec)

Zeta30 · Nov 06, 2009, 10:15 PM

Quote:

Originally Posted by raptor fan

You run the throttle 100% in each mode or just idle up?

What a lot of people do is run 100% on idle up 2 and 3, normal mode they will have either a straight linear throttle curve or a curve so that they can hover at about 50% throttle. Ideally when you switch from normal to idle up you don't want the extra head speed to cause your heli to jump way up you want it to be smooth.

I have my switches set so that in normal mode it will get me off the ground, once I'm off the ground I go to idle up which is a straight 100% across.

Roto Rob · Nov 07, 2009, 01:13 AM

With the ESC in governor mode I set normal mode throttle curves first point at 0, and the rest at the desired head speed. In Idleup I usually up the head speed a little bit, with the same number across the curve. Or a little higher on each end depending on the setup.
You can also use separate governor like on a nitro, it adds some setup issues like mounting the sensor.

Nov 02, 2009, 07:47 PM	#1
raptor fan pro heli crasher Join Date: Oct 2008 Location: Trout Creek MT Posts: 45	How to set head speed? If you dont have a tachometer,whats the best way to get your head speed the same throught the pitch curve.I dont have a tachometer and the head speed is a big part of getting the heli set up.Anybody got a good method of doing this? Thanks

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Nov 03, 2009, 12:48 AM	#2
jasmine2501 No hoovering! Join Date: Jul 2007 Location: Lakewood, CO Posts: 9,015	When you go to fly, if your head speed drops you can hear it. You can adjust the throttle curve to try to compensate for that. I don't bother though - I just run 100% throttle all the time. You don't need to obtain a number for your head speed - just punch up the curve until it flies right.

Nov 03, 2009, 12:09 PM	#3
raptor fan pro heli crasher Join Date: Oct 2008 Location: Trout Creek MT Posts: 45	You run the throttle 100% in each mode or just idle up?

Nov 04, 2009, 04:04 PM	#6
Roto Rob Registered User Join Date: Dec 2005 Location: Denver, CO Posts: 3,079	A governor is a good option for constant head speed.

Nov 04, 2009, 10:34 PM	#7
raptor fan pro heli crasher Join Date: Oct 2008 Location: Trout Creek MT Posts: 45	Wow thats a cool website.You dont use goveners on electric helis do you? I thought they where only for nitros. So you dont have a stunt mode jasmine?

Nov 04, 2009, 10:40 PM	#8
jasmine2501 No hoovering! Join Date: Jul 2007 Location: Lakewood, CO Posts: 9,015	You can use a governor if the ESC has it, but I haven't had good luck with them. I only fly in idle-up stunt mode - I don't use weird mode

Nov 05, 2009, 11:28 AM	#10
Jimmy Flyer Jimmy Join Date: May 2008 Location: Arizona Posts: 150	Basically you spool up then once its at RPM you flick the switch and it stays there til you land... That's the one thing I learned after I got my TRex 250 Set the Thro Curve To 100% Linear and and it'll fly much much better even regularly, hoverings even that much better.

Nov 05, 2009, 01:12 PM	#12
raptor fan pro heli crasher Join Date: Oct 2008 Location: Trout Creek MT Posts: 45	So you just keep the throttle curve at 100% And only adjust the pitch curve?Doesnt that make your head speed exsplode at 0 pitch?Ill have to try that .

Nov 07, 2009, 01:13 AM	#15
Roto Rob Registered User Join Date: Dec 2005 Location: Denver, CO Posts: 3,079	With the ESC in governor mode I set normal mode throttle curves first point at 0, and the rest at the desired head speed. In Idleup I usually up the head speed a little bit, with the same number across the curve. Or a little higher on each end depending on the setup. You can also use separate governor like on a nitro, it adds some setup issues like mounting the sensor.