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Home✈️Aircraft🚁Helicoptere-Elec-Helicopters New or Limited ActivityE-Sky › Belt CP Pitch curve and head speed
08-22-2008 02:57 AM  12 years ago
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Melnic

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Columbia, MD,USA

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Belt CP Pitch curve and head speed
I recorded my heli on my make shift test stand after I adjusted the throttle curve.
Not sure what my head speed was on Idle up 1 or Idle up 2.
What do you folks have for your head speed? Can you express this in RPMS of the main blades?
In my video I accidently say Idle Up 1 a 2nd time when I meant Idle Up 2. I think they throttle curve is pretty close. At least close enough that when I bring this setup outside during the day, I can measure using an optical RPM meter. It won't work indoors because the 60Hz from the lights mess it up.

I'm awaiting my Esky HH gyro so I made my test stand so I could allow it to spin also (2nd video) so that when I install the HH gyro I can test indoors.

I basically have a plank of wood w/ a screw holding it to the Benchmate. 2 Fender washes in between and a nylon insert nut is used so that it will spin but not come off. Wire clamps hold the landing gear on the plank.

Pitch
Tail
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08-22-2008 03:17 AM  12 years ago
Gregor99

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Western Wa

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Most, if all of us don't have a optical tech and rely on a estimater like this one.

http://www.readyheli.com/Online_Hea...ulator_s/81.htm

Mine is about 2800 reported by the calculator. But because of efficiency losses it likely closer to 2500.
Revolectrix Beta Team
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08-22-2008 03:11 PM  12 years ago
Melnic

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Columbia, MD,USA

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I"m missing something here.
Does this website tell you what you head speed SHOULD BE?

Do most folks just set the Pitch and then adjust the throttle points using your ears (like I did) or some other method?
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08-22-2008 05:54 PM  12 years ago
Gregor99

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Western Wa

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The web pages tells what headspeed WILL be. With the exception of efficiency and load loss, which need to be measured with a tach. The estimate I've heard is your actual headspeed will be between 70% and 80% of what's calculated.

As for setting pitch and throttle curves, it varies. Pitch curves are almost as ways set the same.

-3 to max+
Stunt1 max- to max+
Stunt2 max- to max+

With "max" being the maximum mechanical limits of the head without binding. There are some cases where running less than max is desirable. Some heads can do +-13 degrees or more, but don't have the power system to handle that disc load. Reducing to something closer to +-10 keeps the power system from being bogged down excessively and gives the collective more granular control.

Occasionally there are some minor variances like using an S curve on in idle-up to make it more sensitive around mid-stick. Kind of Expo in reverse and applied to the collective. When the total range has been reduced to avoid bogging, this can restore a the "snap" to the collective for pilots that are used to a more responsive left stick.

Throttle curves are what vary the most from pilot to pilot. Here's how I set mine and why.

Normal 0 50 85 95 100
Stunt1 100 95 90 95 100
Stunt2 100 100 100 100 100

I mostly fly in stunt1 and switch in the air. Having normal a normal mode throttle curve that is close to your idle up mode at hover makes the switch between modes more seemless.

I usally fly in idle up, but when I was flying mostly in normal mode I liked having the extra headspeed in normal mode because it makes it easier to land in gusty wind.

These days I usually land in idle up. Hover about a foot or two off the ground, I hit throttle hold and glide down. Seems to work well regardless of wind conditions.

For the most part hitting your target headspeed usaually means selecting the right pinion rather than tweaking with throttle curves. While some adjustment can be done with the throttle curves, the motor and electronic run more efficiently above 80% so its best to tune your setup with the pinion first.

For me tuning the headspeed is about balancing battery run time vs helicopter responsiveness and stability. I like a slightly higher headspeed as it makes the heli more stable in wind and the heli's response tends to follow my inputs much more precisely. At the lower head speeds, the heli will bob up and down and tends to be a little sloppy and docile. Lower headspeeds are good for learning, but I found them a little frustrating as my skills progressed. Not saying there's anything wrong with longer run times or a more docile heli. Its just that I prefer better wind performance and a more accurate response from the heli.
Revolectrix Beta Team
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