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HelicopterAlignOther › What's your normal mode throttle/pitch curve?
11-29-2007 11:36 PM  9 years agoPost 1
fiveoboy01

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Waunakee, WI - USA

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I got my revmax setup, works well, 1900 and 2150 in ST1/2.

It's disabled in normal mode, on the ground(center stick) if I flip from normal to ST-1, the head speed actually gets lower slightly... It didn't do this before but now that the engine is leaned after break in, there's some extra power there.

I want to keep the revmax disabled in normal mode to have a safety net in case the sensor or limiter fails.

Right now the curve is 0-25-50-75-100.

Should I simply lower the points 5 or 10 percent at once until I get minimal rpm change from normal to ST-1?

Also, curious what you are all running for pitch curves. Mine is something like 40-45-50-75-100, don't have my tx in front of me so they might be a tad different than that. I did use a pitch gauge to get -4 to full positive pitch.

Mikado Logo 400, hopefully ready by spring.

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11-30-2007 12:25 AM  9 years agoPost 2
Zaneman007

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Texas - USA

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I'm using the multigov.

I have the head speed governed to 1700 in normal, 1950 in IDL1, and 2050 in IDL2

I have a linear pitch curve, which implies I hover at 3/4 stick. Pitch in flight modes are as follows:
N is -4 to +10
1 is -10 to +10
2 is -12.5 to +12.5

I have a linear throttle curve in normal, 0 to 85. A v curve in 1 and 2 of, 100, 80, 100.
If you want a saftey net, tack your head speed in normal mode. Then if the gov fails, you are OK.

Old Guys Rule!

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11-30-2007 01:24 AM  9 years agoPost 3
Rockohaulic

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Canyon Country, CA, USA, 3rd Rock from the Sun

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Right now the curve is 0-25-50-75-100.
That is a good curve for setting things up, but not to fly in Normal mode. I'm surprised you're not overspeeding with that curve.

I'd try something closer to: 0-12-28-55-100

Saturday morning I flew my helicopter in my pajamas
How it got in my pajamas I'll never know

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11-30-2007 02:25 AM  9 years agoPost 4
Simmer

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Massachusetts

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I have my normal mode set up with a straight line for pitch -12.5 to +12.5 My throttle curve in normal is per the book, that was not a straight line. 0 35 55 75 100 I think (whatever the manual says)

I then had to turn down the top point from 100 to 05 to keep the rpms under 2150. I may go even lower to 92% I do not have a gov hooked up yet, I set up all my flight modes without the gov to make sure I have a good fall back if I lose the giv in flight.

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11-30-2007 02:36 AM  9 years agoPost 5
fiveoboy01

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Waunakee, WI - USA

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That is a good curve for setting things up, but not to fly in Normal mode. I'm surprised you're not overspeeding with that curve.

I'd try something closer to: 0-12-28-55-100
Thanks that's what I was looking for, I'll try something closer to that. I actually think I AM overspeeding a little bit, not past 2100 or 2200 but when I flip to ST-1(set for 1900) the rpms drop noticeably. I'd say the gap in headspeed is similar, maybe slightly less than the change from ST1 to ST2, and that's a 250 rpm change.

Mikado Logo 400, hopefully ready by spring.

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11-30-2007 03:03 AM  9 years agoPost 6
RonHill

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FLL, FL

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Just lower it till you think you are not overspeeding.

I don't fly in normal. I spool up and take off...Once in the air I flip to V2. I land and then flip back...If I don't auto.

I run all my pitch curves the same.

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11-30-2007 04:25 AM  9 years agoPost 7
fiveoboy01

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Waunakee, WI - USA

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I don't fly in normal either, never have. I guess I just wanted a backup mode in case my revmax failed or the sensor quit working. I suppose I can simply tweak my idle up 1 and 2 curves so they're not flat 100% rather than deal with flipping the mode switch.

Mikado Logo 400, hopefully ready by spring.

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11-30-2007 05:04 PM  9 years agoPost 8
Rockohaulic

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Canyon Country, CA, USA, 3rd Rock from the Sun

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fiveoboy,

What governor are you using?

I am running the MultiGov. Bob Li recommends 2 different V curves for the MultiGov, and neither is a flat 100%.

For Overspeed mode, he recommends 100-90-80-90-100.

For Governor Mode, he recommends 100-80-60-80-100.

With a V-Curve, his algorithm can predict better based on the throttle/Collective stick position. It can not predict with a flat 100 line.

Saturday morning I flew my helicopter in my pajamas
How it got in my pajamas I'll never know

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11-30-2007 05:30 PM  9 years agoPost 9
fiveoboy01

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Waunakee, WI - USA

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I'm actally not using a governor, it's a MA Revmax. I am not sure if it "predicts" like the multigov or just limits each time it bumps up against the set limit.

Mikado Logo 400, hopefully ready by spring.

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11-30-2007 10:35 PM  9 years agoPost 10
motowncali

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Napa, ca

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This si why I love and hate forums, I think that one answer was close to what you asked, and the rest were like they didn't even read what you asked.

In normal mode, to keep the motor from over revving.....

throttle 0-21-30-38-55
pitch 27-INH-50-INH-100

I am using the Multi gov so I have my throttle setting in Idle 1 and 3 set up per their recomendations and the pitch is 0-INH-50-INH-100 for both. If you want a little bit of expo in your pitch curve, you could use the other oints to give some pitch expo if you think it is needed. I have not found it necessary.

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12-01-2007 12:28 AM  9 years agoPost 11
idigrc2

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Chico, CA

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I use the Revmax in my raptor, Normal throttle cruve is set up 0,20,38,50,100. St1/2 are set up at 100% on every point and I use the gov menu in my 9c to adjust the head speed 1950 in idle up one and 2100 on idle up two and haven't had any problems with ocerspeeding or bogging the head

I once choked a smurf to see what color it would trun

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