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Slight turn left when power is increased

Old 11-29-2007, 11:55 AM
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Bretuk
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Default Slight turn left when power is increased

I set the Align ESC BL35 ESC throttle response from STANDARD to QUICK, with this increased power the heli turns a slight left then holds ( it didnt do it in STANDARD ESC setting)when the power is increased at a fast rate, is this normal and which throttle response is recommended. The Futaba 401 gyro/ 9650 servo is set at 70% on Spektrum DX7.
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Old 11-29-2007, 12:14 PM
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Default RE: Slight turn left when power is increased

If you are talking about spooling up while on the ground, just use a less rapid throttle increase.
If you are talking about loss of tail authority in the air, then there are at least 2 things to look at.
1. Is the pulley slipping on the shaft? Many have reported this as a intermittent cause of tail blowouts.
2. Try turning down your pitch curve. Less main pitch means that you will be less likely to bog the motor, and will be flying at a slightly higher head speed. That higher head speed increases the authority of the tail.

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Old 11-29-2007, 12:34 PM
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Default RE: Slight turn left when power is increased

Its during a hover, when I increase the power fast, the throttle curve in normal is 0-45-65-85-100 would it be better at 0-45-70-85-100 I never had this when the ESC was set in STANDARD mode. More power , more torque, would my 401 gyro need turning up as suggested in Runryder forum.













Old 11-29-2007, 12:39 PM
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Default RE: Slight turn left when power is increased

what tail servo are you using? what HH % do you have the gyro set to as well? you may need to turn that up, if your not using a digital servo that would also help hold the tail. also make sure the tail servo has enough room to give the tail blades full pitch, it could be when you give it throttle really fast the blades are pitched out all the way and not able to keep up with the torque of the main blades.
Old 11-29-2007, 01:11 PM
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Default RE: Slight turn left when power is increased

The Futaba 401 gyro/ 9650 servo is set at 70% on Spektrum DX7.
Old 11-29-2007, 01:42 PM
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Default RE: Slight turn left when power is increased

i would check the servo control rod, make sure it has full movement to where the blades have maxium pitch. my trex450sev2 has the 401, 9650 servo and im also using the dx7, i think my % is around 75ish and the tail is strong no matter what im doing. are you in hover mode or st1/st2 when your having this problem? if your in hover mode and having this problem try settting up st1/st2 and see if it does the same thing in those modes....because the heli is spinning faster in st1/st2 ull have much better response and tail control. if the problem goes away when you put it in st1/st2 that means you dont have enough headspeed in hovermode. when a lipo gets done charging ill spin mine up in hover mode and tell you what rpms i have. though off the top of my head i think its around 2500rpms.
Old 11-29-2007, 01:52 PM
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Default RE: Slight turn left when power is increased

At the moment I only do hovering. My throttle curve as in manuel 0-45-65-85-100, should I speed it up 0-45-70-85-100. When the ESC was in STANDARD mode I never notice turn to left when the throttle was increased fast
Old 11-29-2007, 02:16 PM
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Default RE: Slight turn left when power is increased

u can still do hovering in st1 and st2, it just makes everything react better and you have maxium tail response. its also a good habbit to get into flying around in st mode because you get in the habbit of going into hovering mode before you land. get it in the air, switch to st1, fly around, back to hovering mode and land....that way when you do start using stunt modes you dont kill the throttle when you get into danager (in st mode that means full negitive pitch). instead go into hovering mode, if you need to kill the power fast, throttle hold works perfect. you dont have to setup stunt1 as if you are planning to do hard 3d.

my hovering mode throttle curve is 0, 45, 70, 85, 100 with pitch curve 42, 53, 65, 80, 100
st1 throttle curve is 100,90, 85, 90, 100 with pitch curve 15, 37, 58, 78, 100 (good rpms with alittle less negitive pitch)
st2 throttle curve is 100,100,100,100,100 with pitch curve 0, 25, 50, 75, 100

i mostly stay in st1 when hovering, i only use hovering mode to takeoff/land. st2 i hardly use because im just getting into FF now, so its only to mess around when i get bored.
Old 11-29-2007, 02:53 PM
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Default RE: Slight turn left when power is increased


ORIGINAL: Bretuk
the throttle curve in normal is 0-45-65-85-100 would it be better at 0-45-70-85-100
Hennesseylord has a lot of good information. But what I suggested was that you change your pitch curve, not your throttle curve. With less pitch, you hover at a higher head speed. This give the tail rotor more speed to overcome the torque of the main rotor.
Old 11-29-2007, 03:09 PM
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Default RE: Slight turn left when power is increased

My
Hover pitch -2/+5/+9.......Throttle 0/45/65/85/100 (will use 0/45/70/80/100)

Idle1 pitch -5/+5/+9........Throttle 100/90/85/90/100

Will set gyro to 75% instead of 70%
Old 11-29-2007, 03:31 PM
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hennesseylord
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Default RE: Slight turn left when power is increased

set it as high as you can, if it wags lower it some until you find the right %. i dont think your gyro is causing the problem though, i think your just running to low of a headspeed.

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