Pitch Curves Mechanical + Tranny

[gaz 6153]

Hi everyone,thanks for the advice in my other topics,gyro and servo turned up today so i'll try and set these up later if i have time after attempting the pitch setup.

Anyway mechanically i have a pitch range of -13 0 +13 zero at centre stick

Lookng at setting the tranny up to give me in

Normall -4 to +10
St 1 -6 to +10
St 2 -13 to +13
Hold ?
I am using a pcm9xii with 7 pitch points,is the above allright,and what should i be looking at setting the points at in between,was intending to use zero at centre for each mode,Finally for hold i have no idea as i want to practice autos on the sim but with settings for my heli,Knight 3d if it helps.

Thanks Gary

[robgt]

To avoid the heli "jumping" if you change flight modes in the air, I would recommend you set all pitch curves with 0° at mid-stick and +13° top stick. Normal mode -4° at bottom stick and St1 and St2 -13° at bottom stick.
I set my Hold curve the same as my Stunt curves, so the only one with reduced negative pitch would be your Normal mode.
You should only need to specify values at the Low, 3 and High positions on each curve and leave the rest inhibited for a linear curve in each mode.

Cheers,
Rob

[gaz 6153]

Thanks for that Rob,have set up as you suggested just got to work out throttle curves and wether to use expo or not on both.

[robgt]

No problem mate.
If you're not using a governor then start off with a basic V curve with a lowish mid-point (to stop over-revving with no load on the blades) and tweak the points inbetween middle and top/bottom to achieve a fairly constant headspeed through your flight.

My flights start with a spool up to mid stick in normal mode, then flick into Idleup and take off (could be Idle1 or 2, depends on what my plan is at that moment!)

Normal mode throttle curve starts at 0% and at mid-stick is lower (or matches) Idle1, then carries on a linear curve to 100%.

My Idle1 (5 point) curve as a standard thottle curve for gentler 3D flight is:
100%, 67.5%, 45%, 67.5%, 100%

Idle 2 is for more aggressive flight (so more headspeed required):
100%, 72.5%, 55%, 72.5%, 100%

If you have a look at the Vision 50 video I posted recently, you will see that the heli hardly ever over-revs through the flight - the throttle curves shown above are in use on that model (without a governor fitted currently).

Just an idea of a starting point for you maybe

Cheers,
Rob