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Electric Helicopters Dedicated to larger than Micro/Mini Electric Helicopters of any Brand


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Old 11-16-2008, 06:24 PM   #1 (permalink)
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Default Can't get my throttle and pitch curves right

I was out in my yard messing around and I went into idle up mode and for some reason the pitch is not equal up or down. When I punch it up it doesn't have much but down or negative pitch it has all kinds of power. So why is it more when I go negative pitch then when I go full positive pitch?

Idle up mode:

Throttle curve
100
90
80
90
100

Pitch curve
0
40
80
90
100

Normal mode:

Throttle curve
0
45
65
85
100


Pitch curve
40
45
55
75
100

Is that good for idle up mode and normal? By the way I am using a Futaba 6EX 2.4 radio. If someone has a better setup let me know please!
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Old 11-17-2008, 08:27 AM   #2 (permalink)
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GRAVITY
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Old 11-17-2008, 09:20 AM   #3 (permalink)
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It's because of your pitch curve. In idle up, your pitch curve should usually be 0-25-50-75-100. Yours (0-40-80-90-100) only gives you a 20% pitch range between middle stick and high stick (80-..-100) but you have 80% pitch range between middle stick and low stick.
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Old 12-10-2008, 10:59 PM   #4 (permalink)
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Try seting the pitch with a pitch gauge dont worrie about the pitch numbers in the tranmitter. Adjust transmitter to give the pitch you want on the gauge once you set the pitch with a gauge its set for good dont mess with it. Now you only have to mess with throttle numbers. I usually set mine with a strait line of 90 across in idle up. Just make sure to match everything a mid stick so when you flip the switch to idle up the heli will not jump and motor doesnt surge on you. My pitch is usualy -11, 0 at mid, +11


Try this throttle curve
Nomal 0,inh,85,85,85
Idle up 85,85,85,85,85
If 85 is to low or to high of a head speed adjust to your likking.
The point being electric motors run there best in the power band which is around 85 to 100%. Unlike nitro motors which need a more fine tuned throttle curve like 90,75,65,75,90 and 0,45,65,75,90 for example.
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Last edited by smoothb10; 12-11-2008 at 01:15 AM..
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Old 12-18-2008, 04:05 AM   #5 (permalink)
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A flat throttle curve will mean that the headspeed changes as the pitch changes. Unless you are running a governor. It is like trying to drive up a hlill without adding throttle to you car, you will slow down. With an electric, this also increases the amp draw and heat in the motor, ESC, and pack.

Normal:
Pitch: 40 - 45 - 50- 75 - 100 (fine tune the 40 and 45 to get -2 to -3 degrees at full low stick)
Throttle: 0 - 65 - 80 - 90 - 100 You want to get the headspeed up into a reasonable range. Electrics need to be run over 80 throtlte for bst effciency.

Idle Up:
Pitch: 0 - 25 - 50- 75 - 100
Throttle: 100- 95 - 90 - 95 - 100
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Old 12-29-2008, 12:21 AM   #6 (permalink)
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Default Hmmmm

UAV, what heli is this on?

The purpose of the dip in the idle-up throttle curve is to completely remove the possibility of an overspeed. Most hotshots will tell you to just go linear on your throttle in idle-up (100% straight across). The idea is that you're not going to be flat pitch for more than a split second any way (pitch decreases headspeed). The odds of overspeeding are minimal on most stock helicopters and it keeps your headspeed from bogging down if you make a quick collective input. I ran my helis with the stock throttle curve and definitely noticed the headspeed lag when pulling out of any type of high-G maneuver. At 100% the power is there when I need it.

Widower is right, another problem is your pitch curve. In idle-up it in most helis I am familiar with go: 0-25-50-75-100. ( my CP Pro, Blade 400s and T-Rex 500)

From there, your linkage and your swash mix should be set to give you flat pitch at 50 and + - settings that give you the correct amount of pitch for the heli you are flying.

Hope this helps.
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