Help on Throttle Hold Curves

[Mart61]

Hi Guys

I'm tinkering with my DX6i and want to set my throttle hold pitch curve for my T-rex 500.

FYI I have my normal pitch curve set to: 45, 50, 55, 75, 100. This gives me a pitch of -2, 0, +11.

What would you recommend I set my Throttle Hold pitch curve to?

Cheers.

[squeaky pete]

same as you idle up mate

[Mart61]

At my stage of learning pete, I'm not using idle up. Just normal.

[squeaky pete]

just set it to the same as what you use mate, then you get no unexpected ups or downs when you flick it

[waveydavey]

Duncan Osbourne gave a beginners guide to Auto's in the last MHW and he recommended -4 to +10 for normal auto performance, you only need the full -ve pitch for 3D type autos.

[Holst]

Hi Guys

I'm tinkering with my DX6i and want to set my throttle hold pitch curve for my T-rex 500.

FYI I have my normal pitch curve set to: 45, 50, 55, 75, 100. This gives me a pitch of -2, 0, +11.

What would you recommend I set my Throttle Hold pitch curve to?

Cheers.

I would change the normal curve so that midstick is zero pitch (50) and then run a mirror image in idle up.

If your not at zero pitch at midstick in normal then the heli will jump when you switch into idle up.

Personally I run mine at 0,25,50,75,100 for idle up and 30,40,50,75,100 in normal.

With the throttle curve I run 100,100,100,100,100 in idle up and 0,50,100,100,100 in normal.

That way there is no jump when you switch over in flight.
You may prefer that there is a slight jump in headspeed when switching into idle up, but as im flying a 450 I want as much headspeed as possible for stability (and my motor isnt mega powerful)

[Mart61]

Thanks for the input guys.

I've just set my throttle hold pitch curve to 30, 40, 50, 75, 100. I reckon that'll give me about -4, 0, +11. I'll check it out on my pitch gauge tomorrow.

[Made2Fade]

Thanks for the input guys.

I've just set my throttle hold pitch curve to 30, 40, 50, 75, 100. I reckon that'll give me about -4, 0, +11. I'll check it out on my pitch gauge tomorrow.

Thing is when you flick that switch your gonna get a pitch jump now. So id advise setting your normal and idleup curves to the same if you havent already.

[Holst]

Thanks for the input guys.

I've just set my throttle hold pitch curve to 30, 40, 50, 75, 100. I reckon that'll give me about -4, 0, +11. I'll check it out on my pitch gauge tomorrow.

I prefer to set throttle hold to the same pitch range as idle up, so you can check the servos at full throw when doing pre-flight checks.

But... Im not confident to practice autos.

However, if you are practicing autos then you might find it harder if you have to auto down when your in Idle up if you have more pitch range. Im not sure if I would have the presence of mind to swith throttle hold on if I lost power for any reason (as im flying electric this is less likely than with a nitro anyway)

[waveydavey]

Something else Martin, once you've trimmed the heli in the flightmode you are normally using make sure you add the same trim to the hold flight mode, you can get some strange motion if you don't.

[Holst]

Something else Martin, once you've trimmed the heli in the flightmode you are normally using make sure you add the same trim to the hold flight mode, you can get some strange motion if you don't.

I thought this was only on the DX7 and that the DX6i had the same trims in all modes.

Im not 100% sure though.

[waveydavey]

In fairness I can't speak with authority on these tx's as I use a Jr 9x2. Well spotted

[Pipistrelli]

Martin,

I was practising Autos the other night and I had set my TH curve to -4 at bottom stick, I found that this was too much negative pitch and can bring the heli down too quickly, so I have reset mine to -2deg max negative!

[Mart61]

Thanks guys. I've now set my pitch curve in hold to match that in normal.

[Tosh]

Only problem here is its not a one size fits all subject.
The amount of negative pitch required for an auto will depend on a few veriables.
Size of heli
Weight of heli
Type of blades
Amount of drag in the system
And so on.

Also some of you are talting about going up and doing full blown autos and some a probably talking about hitting the hold switch from the hover (nothing wrong with that) which is good practice for when you start to do full autos but you wont get into the negative From a hover chop.

l beleive Pip has just started doing full autos and getting on well, he`s settled on 2 deg negative as a good starting point. The thing to do as soon as he feels ready is to slowly increase the negative on the heli and get used to not being at bottom stick untill he has the full 3D pitch range on the hold curve. Run the blade tight and make sure you have stopped all foward speed before you land. lf not try and land backwards or even sideways to avoid boomstrikes. Good luck with them.