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Blade 400 Blade Helicopters (eFlite) 400 Helicopters


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Old 08-21-2008, 10:19 PM   #1
Tail boom
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Default Found smooth pitch/throttle curve for beginners

Hi,

I know we have covered that in the past, but believe me, I spent two months on learning and practicing as a total noob how to hover. Never had flown anything before, neither model nor sim.

So here is to you, my noob fellas, a pitch/throttle curve that makes hovering really enjoyable

(Assuming mechanical pitch setup of -10/0/10, along with stock motor and stock 10T pinion)
Pitch normal: 40/45/50/65/80 (-2/-1/0/3/6)
Throttle normal: 0/33.5/50/65/80

Why does this work so great for me?

Limiting the negative pitch to -2, results in low-damage panic throttle cuts. If you reduced the throttle quickly at a greater negative pitch, you would ram the heli really hard into the ground. On the other side, -2 is high enough, to keep the heli firmly on the ground during spool-up (less tail rotation upon spool-up, and more stable stance as wind gusts might shake the heli while still on the ground).

Limiting the positive pitch to 6, yields two benefits: Foremost, the stick control range above mid-stick is a lot smoother (i.e., more precise due to little increments). I can maintain a stable hover altitude now, since stick movements result in less pitch change while hovering. Secondly, no noob needs a punch out at 10 deg. At 10 deg, the heli would just FLY AWAY. Our Blade 400 hovers at approx. four to five deg positive pitch. So six deg still provides a high enough hover climb rate.

The corresponding throttle curve is pitch-optimized, and maintains a reasonable head speed throughout the whole -2 to 6 pitch range.

For the ones who want a little bit more hover lift, you can use the following curves:
(Assuming mechanical pitch setup of -10/0/10, along with stock motor and 10T pinion)
Pitch normal: 40/45/50/69/87.5 (-2/-1/0/3.75/7.5)
Throttle normal: 0/33.5/50/69/87.5

Let me know if you have questions or how it works for you.

Best,
Frank
P.S.: The curves mentioned above are meant for learning how to hover only. Forward flight or even sport flying requires more positive pitch and according head speed!

Last edited by Tail boom; 08-22-2008 at 11:50 PM..
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Old 08-21-2008, 11:00 PM   #2
Mon_t
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Less head speed removes the twitch.
And a flatter throttle curve prevents the gyro blowing out too much.
But the pitch curve I'd set back to 40/45/50/75/100.
with only +7 of pitch, you're not going to have enough to climb out if you get in trouble
+6 is only just able to maintain a hover
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Old 08-21-2008, 11:19 PM   #3
Tail boom
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Hi,

My curves below are really just for learning how to hover. Forward flight or sport flying definitely needs more positive pitch and according head speed, I agree.

Thank you,
Frank
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Old 08-22-2008, 12:48 AM   #4
Slyster
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I argue for at least this pitch curve... 00-40-50-75-100... even for total newbies.

You still get light negative, but you get used to pushing the stick high so you won't learn it wrong when you eventually work your ways towards linear and idle up throttle.

I am really happy with this right now

P 00-40-50-75-100
T 00-60-70-80-90

I consider it an less intimidating (yet no wimpy) curve that will take you all the way until your ready for idle up (and 3D flight)
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Old 08-22-2008, 05:18 AM   #5
Roger_15
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Not long ago Jmmccain posted the following:

Quote:
The following normal mode throttle curves should provide a very smooth throttle once up to speed. For best results, use with a pitch curve that is linear and provides -2 to +10 degrees (give or take a degree or two). The estimated flight times are for an 1800 mAh battery.

0-63-79-91-100 (4 minutes. high performance)
0-61-77-88-97 (5 minutes)
0-58-74-84-93 (6 minutes)
0-56-71-81-89 (7 minutes)
0-53-67-77-84 (8 minutes)
0-50-63-72-79 (9 minutes)
0-46-58-67-74 (10 minutes)
0-42-53-61-67 (11 minutes)
0-37-46-53-58 (12 minutes)
0-29-37-42-46 (13 minutes, low performance)

These curves are cubic functions. They get the head speed up very quickly and then level out. For the 100% curve:

1.00 x 1.00 x 1.00 = 1.00 (100% stick)
0.91 x 0.91 x 0.91 = 0.75
0.79 x 0.79 x 0.79 = 0.50
0.63 x 0.63 x 0.63 = 0.25 (watch out for the leap from 0% to 63% with 25% stick movement [IMG]file:///C:/Users/Jeepnut/AppData/Local/Temp/msoclip1/01/clip_image001.gif[/IMG])
0.00 x 0.00 x 0.00 = 0.00 (0% stick)

I'd suggest starting with the curve that peaks at 79%. This curve should provide moderate performance and flight times. If you just want to hover, try the 58% curve.

Edit: The higher you go when selecting one of these curves, the more sensitive the heli will be to the throttle stick. The 100% curve is not tailored for hovering!
I started with his suggestion of 0-50-63-72-79, and I found this to be ideal for my needs as an “almost” beginning heli pilot, and I was astounded by how much the heli calmed down. If you are just starting out, I strongly recommend this throttle curve. However, I wouldn’t stay there long. Myself, I used it for about two weeks and ran several battery packs through the heli until I started feeling too comfy and moved up to the next level. “0-53-67-77-84” This curve makes me work harder but it moves me forward in a gentle and predictable way.

Leave the pitch curve stock and try it, I think you’ll like it.

Thanks Jmmccain.

Roger.
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Old 08-22-2008, 10:09 AM   #6
carljw
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Default 00 pitch cur

I am confused on the OO for the pos L on the pitch curve that was suggested. I am trying to tame my B400 so I can learn to hover but I always end up slaming it to the ground. What would the OO do in the L position. I am useing the stock curves for now.
35% 42.5% 50% 75% 100% for pitch.
0% 25% 59% 75% 100% for throtle.
I tried some of the suggested from the post but It would not lift off. I have the X gear and training gear on and I know its to heavy.
Carl
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Old 08-22-2008, 11:55 AM   #7
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I was using thr 0-25-50-60-80 pich 40-45-50-75-100 but 2 weeks ago i tried idle up using 85-85-85-85-85 beleive me is a very much smoth fligth, and the esc runs more cool, i was so scared of idle up but once you tried you wont come back.
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