Throttle and Pitch Curves

[mccd07]

Would someone please advise me on a normal throttle and pitch curve?

I am trying to learn and understand what to look for and need some guidance. Are there any good books or magazines out there?

Also, when setting up CCPM I understand that the ali/elev are the same % (60 plus or minus; depending on what direction they are facing) but I do not understand the pitch % -35. Can someone explain this to me?

Thanks again for all your help,

Michael

[mccd07]

Any help would be appreciated.

[cbflys]

When you say "Normal" throttle and pitch curves - do you mean normal for all flight modes (Normal, Idle-up 1, Idle-up 2)? I'll give you a general answer, if you have a more direct question, please ask.

To answer your CCPM question first. The percent values are the amount of throw that the servos will use for pitch control. You adjust these so all servos move the same amount with pitch changes. There are many sources on the internet for correct setup of CCPM throws.

You'll need to do mechanical setup first. Everyone has their own perferred method - I'll share mine. Assuming a 5 point pitch curve (Low, 1/4 stick, 1/2 stick, 3/4 stick, and High). Setup a linear (straight) curve from 0% at low stick to 100% at full stick. Then adjust your head linkages so you have 0 pitch when you're at half stick. This will give you equal positive and negative pitch travel.

Pitch curves:
In normal flight mode, I like to hover at 1/2 stick. So move the stick to the 1/2 position and use the pitch curve adjustment till you have approx 5 degrees (positive). Next move the stick to the high position and use the pitch curve adjustment till you have about 8 to 9 degrees of pitch. Next move the stick to the 3/4 position and adjust till your halfway between the 1/2 and full stick values. Now move the stick to the low position and adust for approx -2 degrees. At the 1/4 stick position, adjust till your halfway between the low and 1/2 stick values.

For Idle-up 1 and 2, you'll want -8 to -9 degrees at low stick, 0 degrees at 1/2 stick, 8 to 9 degrees at full stick. Adjust the 1/4 and 3/4 stick positions as you did above.

If you have a seperate pitch curve for throttle hold, make it the same as the normal curve.

Throttle curves:
You'll need to determine the head speed you want to run. But generally, you'll setup as follows. In normal flight mode, you'll have 0% throttle at low stick and 95% at full stick (the other 5 % will be used with aileron and elevator to throttle mixing). Start with a linear curve. The rest you'll do at the field. You adjust the throttle so you hover at mid stick. To increase the head speed you'll need to decrease the pitch and increase the throttle at any given stick position. Then you simply adjust the throttle curve at all points so you have a constant head speed at all stick positions (except low, which should return to idle with trim up and kill the engine with trim down). For the Idle-up 1 and 2 throttle curves, you'll want a constant head speed at all stick positions. The throttle hold should be set so the engine idles when throttle hold active.

Set aileron to throttle mix so that the throttle increases 5% with full aileron stick deflection. Same with elevator to throttle mix. This will help keep a constant head speed when you are using the cyclic.

Hope this helps.

[mccd07]

Great, thank you for the time you put into this.

Just what I needed.

[Walkera Down]

Yes, thank you very much for the info. Does this pertain to "mechanical setup" too?

Thanks,
Harold.