Help with 600 Curves

[Mart61]

Hi Guys

I'm just sorting out the pitch and throttle curves for my 600. At the moment I've set up to:

Pitch: 40, 45, 50, 72.5, 95. This gives me a pitch range between -2 at low stick, 0 at mid stick and +10 at full stick.

Throttle: 0, 40, 60, 80, 100.

Are these curves about right for a total learner like me?

Cheers.

[Andy from Sandy]

Are you running a governor?

The pitch curve is fine.

How is your throttle linkage set? If you have the throttle half open when the tx is at 50% then the curve is too high. You are hovering at about 3/4 stick so start by setting your throttle curve to somethig like 0, 25, 37, 50, 100. The only precise way to get the throttle curve set for the hover is by using a tacho (unless you have something like a revlock).

[ivor-bigen]

yeah thats prety close to what you want, i might even consider droping it to -3 just to be sure it will come down in a breeze.
what i would do with throttle curve is, get it into a hover and get the hover point reving at the amount of rpm you want it to have.
then look at the curve you may want to bring point 2 up a bit so you can lower the stick with out to much rpm drop.

edit
beat me to it

[Mart61]

Thanks guys.

Andy: Not running a governor and, at mid stick my throttle position on the crab is just over half way. Do you mean that I should be hovering at about 3/4 stick? (I.e. I should ne at around 60% throttle and 5-6 degrees on the blades?)

Ivor: Thanks - not too sure what you mean here.

Both: Can you confirm whereabouts on the Tx stick I should be hovering at and at what pitch and throttle I should be at?

[ivor-bigen]

The throttle is hard to say what % you need to be at, it really is a case of going to the field and trying it out.
The point i was makeing about raising point 2 is if your hovering and the wind gets under the rotors it will cause lift, you now need to drop the throttle stick to allow the heli to float down, but you dont want the engine revs to drop away to much.
It is really a case of tweeking it at the field untill your happy with it.

with 0 in the middel it should be hovering just under 3/4 stick.

[Tosh]

Not sure lf l`m reading that right but it looks as though you`ll be hovering at 80% throttle. Andy`s numbers look a lot better.

[Made2Fade]

Martin why 72.5 at point 4 and 95 at point 5 m8? Why not just drop your swash afr a tiny bit and have 75 at point 4 and 100 at point 5? Also dial in Andys throttle curve and adjust from there.

[Andy from Sandy]

Here is another persons view on the setting of the throttle curve. Very good info and is in line with what Ivor suggests.
Setup: Throttle Settings

at mid stick my throttle position on the crab is just over half way.

Don't keep referring to the stick position but use the curve percentage. So what you want is for the throttle barrel on the carb to be half open when the curve value is 50%. You then want the throttle to be wide open when at 100%. Then you want the engine to idle when the curve is at 0%.

Your pitch curve as Ivor has stated dictates that the model will be hovering with the stick at about 3/4. This is good as it will allow you later to move onto full 3D curves without any hassle.

Now you should find there is enough power from the engine when it is at about 50% on the curve for the helicopter to hover. Hence point 4 on the throttle curve is at 50%. When test flying if the engine sounds like it is screaming then lower point 4 or if you need more headspeed increase the value of point 4.

[Mart61]

Martin why 72.5 at point 4 and 95 at point 5 m8? Why not just drop your swash afr a tiny bit and have 75 at point 4 and 100 at point 5? Also dial in Andys throttle curve and adjust from there.

Hi Lee

By using these figs at mid stick I got 0 pitch and at high stick I get +10. I just made the 72,5 at point 4 so that the curve is linear between mid and hi stick. Is that wrong?

Thanks for the link Andy - useful stuff.

[Andy from Sandy]

By using these figs at mid stick I got 0 pitch and at high stick I get +10. I just made the 72,5 at point 4 so that the curve is linear between mid and hi stick. Is that wrong?

No, it is spot on.

It looks like you built the model mechanically correct to get full pitch range and then using the programming capabilities of your tx to get the actual pitch range you want to use. This is exactly what is needed.

[Made2Fade]

Yeh its spot on for the figures (amount of pitch in degrees) you want ill not argue there but...
if you drop the swash afr value a little you will still get equal pitch throughout the whole range and then you can put point 4 to 75% and point 5 to 100%. Then when your flying gets better all you have to do is open out the PITCH swash AFR value to give you more pitch. Now i would have said the technique you are using at the moment would be fine with a mechanical system but the way im saying is better with CCPM (IMO).

[Mart61]

Thanks so much guys for your help - much appreciated.

Final question. On looking at the link you sent me Andy it say that, for hovering, I need not bother having hi stick reach 100% throttle. If this is a fact, what you recommend I have at hi stick on the throttle curve? The link shows 70%. Is that OK?

[Andy from Sandy]

What I think little rotors is recommending is you don't go for full power climbouts whilst using the normal curve. It is really down to you now. Go with little rotors to start with and if you want the full power of the engine then increase point 5 accordingly.

Made2Fade, I think your solution is better. I don't play with CCPM machines often enough.

Martin, Adjust your pitch curve for 75 at point 4 and 100 at point 5 and then lower the swash afr for pitch until you get back to the 10 degrees.

[Mart61]

When you say swash AFR, my swash mix shows:

Aileron = -60
Elev = +60
Pitch = +60

Which figures should I alter, or do I need to ease up on all of them?

[Andy from Sandy]

Martin, Scrap everything I just said. Leave everything as it is. The swash afr is a linear adjustment that will affect the amount of negative pitch as well as positive pitch. If you alter the swash afr now you will muck up your whole pitch curve.