Pitch & Throttle curves

[dave26985]

Can I get some examples of some 5 point P & T curves to use on my DX7 for my hurri.
What are some of you guy's using for normal vs. idle-up. Thanks, Dave

[dogfart]

N
T 0, 50, 80, 90, 100
P 50, 50, 50, 75, 100 (with 50 = 0 degrees and 100 = + 10 degrees)

F1
T 100, 95, 90, 95, 100
P 0, 25, 50, 75, 100 (with 0 = - 10 degrees, 50 = 0 degrees, and 100 = + 10 degrees)

[Pinecone]

On change I would recommend is 40 - 45- 50 - 75 - 100 on the Norm Pitch Curve.

You want to have some negative pitch to stick it to the ground in wind(to keep it from tipping over) or to get it to come down in the wind.

[mjdee14]

On change I would recommend is 40 - 45- 50 - 75 - 100 on the Norm Pitch Curve.

You want to have some negative pitch to stick it to the ground in wind(to keep it from tipping over) or to get it to come down in the wind.

I agree with Pincone....you will need some neg pitch...at 0 deg in a good wind the disk will act like a wing... 1- 2 or negative is always recomennded.

[dave26985]

Thanks guys,

[dogfart]

I have flown in the wind plenty and never needed one degree of neg pitch. But, lots of folks, including Finless, recommend it. And, I fly a heavy machine (Trex 600E).

[mjdee14]

I have flown in the wind plenty and never needed one degree of neg pitch. But, lots of folks, including Finless, recommend it. And, I fly a heavy machine (Trex 600E).

DF....I think it really helps more on the ground to keep it from tipping over in a breeze, but i have had to use a little more than zero to get a lite heli to come down as fast as i wanted....

I'm sure with the weight of most heli and the reduction in HS they will all come down eventually...as we used to say at the airlines..."we have never left one up there". They all come down eventually !

[Madedon]

I run on the following settings:

Normal
T 0, 50, 80, 90, 100
P 46.5, 50, 50, 75, 100 (with 46.5 = -2 degrees and 100 = + 11 degrees)

Idle1
T 100, 95, 90, 95, 100
P 0, 25, 50, 75, 100 (with 0 = - 11 degrees, 50 = 0 degrees, and 100 = + 11 degrees)

Idle2
T 100, 95, 90, 95, 100
P 0, 25, 50, 75, 100 (with 0 = - 11 degrees, 50 = 0 degrees, and 100 = + 11 degrees)

[Pinecone]

Hmm, if 50 = 0 and 0 = -11, 46.5 won't be -2. more like - 0.55 degrees. 41 would be -2, although I round to 40.

And with the 46.5 - 50 - 50 setup, you can't get any negative pitch until you are WAY low on the power. You want to still have some power with the negative. I rn:

Throttle: 0 - 65 - 80 -90 -100
Ptich: 40 - 45 50 - 75 - 100.

With this I can get about -1 pitch with 65% throttle.

[WhirlingBladesOfDeath]

I run my normal pitch curves exactly as Pincone posted above.

I use a governor for throttle, so don't follow my throttle curves of 0-56-56-56-56, and 58-58-58-58-58! ;)

[Madedon]

.... So I don get enough power when in negative pitch .

That explains a lot as yesterday I broke a set of wooden blades as I was trying to land my heli on rough terrain (uneven).

I thought that the negative pitch I was getting was enough to make my heli to stick to the ground. Unfortunately I had to find out the hard way that was not enough.

Anyway thanks Pinecone for pointing this out for me

[Pinecone]

Sorry you had to learn the hard way. But you weren't the first. :)

[Wazzer]

Hi Guys great info here

Can some one please post there Pitch curves in degrees as opposed to TX percentages,and recommended throttle curves to suit (norm and Idle 1)

I am hoping to maiden my Hurricane tomorrow and all i have left to do is program the curves.

I would like to add that i prefer to hover at mid stick as opposed to 3/4 so a mid stick pitch of about 5 degrees is what I'm looking for

Any help would be most appreciated
Thanks

[Mikej]

Wazzer,

You can work it out easily ....

If set up properly

Low stick = -10 degrees (= 0% throttle)
Half stick = 0 degrees (= 50% throttle)
Full stick = 10 degrees (= 100% throttle)

so 25% throttle = -5 degrees
75% throttle = 5 degrees

I use 38, 53, 66, 79, 100 if my maths is correct this gives me -2.5 degrees, 0 degrees (slightly over), 3 degrees, 6 degrees (just under) and 10 degrees.

This gives me hover just over half stick and a fairly straight pitch curve.

Cheers,
Mike.

[Wazzer]

Thanks Mike

I didn't think of it that way

Obvious really!!

so if i wanted to hover at mid stick exactly i would increase the mid point a bit on both the Throttle curve and the Pitch curve?

Cheers

Ben

[Mikej]

I have my throttle curve set to 0, 85, 90, 90 ,95. The reason is that I am told that brushless motors much prefer running at constant revs and at higher speeds (more efficient and hence longer flights).

By having it like this the motor is up to speed at half throttle and stays constant in the "zone" that I spend most of my time (half to three-quarter stick), this way you simply control lift by changing the pitch of the blades (this is how full-size helis and IC models work).

The Gaui ESC that I use has a really soft start so getting up to high percentages on the throttle so quickly is not a problem - just make sure that you give the motor enough time to get up to catch up speed at half throttle - I generally gently move the stick to about quirter throttle, let the motor "catch-up" and then raise the throttle again.

Enjoy !! :fly

Mike.

[Pinecone]

I set up so that mid stick and above is the same for Norm and Idle Up.

So I use:

Normal:
Pitch: 40 - 45 - 50 - 75 - 100 (-2 to +10 or so)
Throttle: 0 - 65 - 80 - 90 - 100

Idle Up:
Pitch: 0 - 25- 50 - 75 - 100 (_/+ max)
Throttle: 100 - 95 - 90 - 95 - 100

If you ahve an Idle 2, I set up the same pitch curve as Idle 1 but 100% flat throttle.

[Wazzer]

OK thanks guys

I Maidened the Hurri this morning and this is what I was flying with.
Bear in mind I prefer to hover at mid stick.

Norm pitch -5, 1, +5, +8 +10
Norm Throttle 0, 60, 80, 90, 100

I currently have all flight modes set the same just in case i hit the swicth by mistake
throttle hold pitch curve is also the same.

I am currently only doing basic hovering moves not even moved into forward flight yet but this heli is so stable and smooth i predict advanceing much quicker than with my Shogun!!

what i would like to know is are these curves OK so far?

And i am thinking of setting up Idle 1
with same pitch curve and 80, 90, 90, 90,100 on throttle

What do you think?

Ben

[mjdee14]

Wazzer....


Is there a reaon you want to hover at midstick.....?

I know many do..and I thought it would be good also..but after reading and watching all the vids and everything.....it made sense to set up midstick at Zero..

As far as your Idle 1...you wouldn't want 80 at the low point...you would want the 90 or better.... normal full pitch idle 1 would normally be something like

95 90 85 90 95 or 95 all across..throttle
looking for -10 -5 0 +5 +10 Pitch.

Also....in normal you have a LOT of negative pitch available -5

You could reduce that to - 2 and it would soften the feel and it wouldnt seem so sensitive...most helis hover about +6 deg....so from low stick at your -5 to midstick
+6 your moving the blades 11DEG I would imagine the slightest movement of the stick downward has a big result.

I have my normal set at zero midstick...so I hover a tad above 3/4...I have the max negative set at -2 so I am -2 -2 0 +5 +10 so you can see from low stick -2 to hover I move the stick 3/4 of the way and only move the blades 7 - 8 deg.

You just need some negative pitch to be able to "stick" the heli to the ground and most agree -2 to -3 is plenty....over that you take a chance of "dumping" the stick to low in a panic and driving the heli into the ground.

The above works for me....and is just my opinion... others may have other ways of doing it.

I now make basic adjustments before flying...then "fine tune" the normal pitch by feel... if the stick feels too sensative I take some low pitch out...you can also use expo to help a little..

Whatever works for you and you feel comfortable with is good for you....

[istandalone]

how many of 'yall's normal and idle pitch curves are identical? i changed mine so they match exactly. i got sick of flipping to idleup when hovering in normal only to have the heli slam into the ground. also got sick of switching out of idleup when coming in for landing and having the heli rocket into the sky. i have mine identical, so there is no suprises when i flip the switch. is this bad? am i the only one?

[mjdee14]

how many of 'yall's normal and idle pitch curves are identical? i changed mine so they match exactly. i got sick of flipping to idleup when hovering in normal only to have the heli slam into the ground. also got sick of switching out of idleup when coming in for landing and having the heli rocket into the sky. i have mine identical, so there is no suprises when i flip the switch. is this bad? am i the only one?

I don't have them "Exactly" alike, but what i do do is ensure they are both the same in hover.....

I have the -10 on idle 1 but only -3 on normal.

What I usually do is get the heli trimmed out in normal...then disconnect the motor wires, with the stick at about 3/4 (hover point) I switch between normal and idle and ensure when I switch...nothing changes...trims pitch, etc...I may have a little more throttle but it dosen't usually cause any problems.

[istandalone]

so basically what your saying is to have them close (if not the same) above mid stick? so if i'm going for -10 0 +10 on idle1, then have something like -5 0 +10 on normal? this makes sense.

[Wazzer]

Wazzer....


Also....in normal you have a LOT of negative pitch available -5

You could reduce that to - 2 and it would soften the feel and it wouldnt seem so sensitive...most helis hover about +6 deg....so from low stick at your -5 to midstick
+6 your moving the blades 11DEG I would imagine the slightest movement of the stick downward has a big result.


Whatever works for you and you feel comfortable with is good for you....

I just prefer to hover at mid stick and another reason is that my closest flying buddy is jungle Bob and he also hovers mid stick. This way we can fly each others helis just that bit easier.

Good point on the neg pitch in normal it does tend to descend quite quickly!

I will make the changes as suggested and see how it feels.

Many thanks for the help

Ben

[mjdee14]

I just prefer to hover at mid stick and another reason is that my closest flying buddy is jungle Bob and he also hovers mid stick.
Ben

Like I said whatever works for you...and JB.

Remember when you progress to more complicated manuvers you will be at +6 midstick....and if you want -10 you will have 16 deg of travel from midstick down....and only 4 deg of travel midstick up to +10. You will have to be careful with anything below midstick...unless you just want to use the same as normal...and just turn up the throttle...

Mike

[Wazzer]

I have no real ambition to fly 3D

My interest is more scale type flying.

I would like to do some basic loops and rolls though and maybe a bit of inverted hovering but thats all really.

I will be looking for a scale 30 size AS350 shell for the Hurry but not for a while yet

Point taken on the -16 degrees of travel from mid stick

thanks for your advice

Ben