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HelicopterBeginners Corner › Adjusting throttle curve at full pitch
08-05-2011 08:02 PM  6 years agoPost 1
CF1

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Olympia, WA

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I was setting mine back up the other day because I changed the pinion. In the past I strapped the heli down to my workbench and tached it at 50% stick, 75% and 100% and adjusted the curve at each place until it was the same head speed in each place. Talking with some friends and reading lots of posts it seems that most people get their head speed at midstick then make a linear curve from that point to 100%. It seems to me that in most cases this would be changing the head speed at you progressed up the curve.

Am I over thinking this?

Thanks,
Chris

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08-05-2011 08:10 PM  6 years agoPost 2
Rafael23cc

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Junction City, KS

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CF1
Am I over thinking this?
Yes.

Are you being safe?
In the past I strapped the heli down to my workbench and tached it at 50% stick, 75% and 100% and adjusted the curve at each place until it was the same head speed in each place.
Definitely not. I assume that process takes quite a bit of time and it is very dangerous. Do a search for ground resonance in youtube to see what I mean. I would post some videos but can't access yt from this computer.

Rafael

Keep your feet on the ground, but your eyes on the sky.
Team Heliproz.com

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08-05-2011 08:17 PM  6 years agoPost 3
Heli0228

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Ripplemead, Va

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Throttle curve

If the out put on the raido is different at 50 75 100 and it goes up then the head speed will go up, if the out put is the same ( A Flat Line) then the speed will most of the time stay the same. IF the pitch increases and the throttle does not got up then the head speed may drop because of the added drag on the blades. You can tach it at 50 75 100 but doing it on a bench may not do you justice because the heli is not flying it is pulling aganist the table so you may have less head speed. I think the best thing to do is get a govenor and set the head speed you want and let it do the work. I think with curves you can get close to the head speed you want but drag can change on the blades and cause head speed problems. Heli's can be one hard thing to figure out have fun.

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08-05-2011 09:00 PM  6 years agoPost 4
CF1

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Olympia, WA

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When I first did my setup govs for the electric were pretty sketchy. I did switch over to the gov a month or so ago to try it out but didn't have the best success. Most posts on RR people were staying away from them with the CC35 that I am using.

One other thing I noticed was that when I switched pinions. If I was at hover and gave full collective the tail was then unable to keep up with the torque even with the most gain I could give it. When I lowered my end points on the throttle curve from 100% to about 93% it helped a lot. That is why I started thinking about all this.

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08-05-2011 10:01 PM  6 years agoPost 5
CX1

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Canada

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I would set-up a flat line 90% -100% idle up 1 and 2 respectively
and lower my pitch curve if necessary

unsure as to what heli your setting up but I wouldn't mess with the throttle curves

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08-05-2011 10:13 PM  6 years agoPost 6
CF1

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Olympia, WA

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Didn't think it mattered that much since it was a method I was asking about, but it is a TRex450 SE with an AON 3500, CC35, HB65s, DS420, GY410.

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08-05-2011 10:43 PM  6 years agoPost 7
CX1

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Canada

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If I was at hover and gave full collective the tail was then unable to keep up with the torque even with the most gain I could give it. When I lowered my end points on the throttle curve from 100% to about 93% it helped a lot. That is why I started thinking about all this.
is it possible you are using too much pitch (more than 10*)
or try using cf tail blades to increase your tail authority
did you try setting the tail in rate mode ?

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08-05-2011 10:47 PM  6 years agoPost 8
CF1

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Olympia, WA

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Yes the tail is mechanically setup correctly. Only thing I can think of is I used to fly with the blue tail drive gears and recently switched to the SA frame set and used the gears that came with it. I'll have to count the teeth on it. A while back they changed the gears to give a faster tail to counter all the higher then they designed for head speeds.

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08-05-2011 10:52 PM  6 years agoPost 9
CX1

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Canada

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having the wrong tail gears is a possibility

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08-05-2011 11:13 PM  6 years agoPost 10
CF1

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Olympia, WA

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The tail problem was just what started me thinking about the entire throttle curve setting process.

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08-05-2011 11:24 PM  6 years agoPost 11
CF1

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Olympia, WA

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106T on the gear so it is the correct one.

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08-05-2011 11:31 PM  6 years agoPost 12
CX1

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Canada

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ahh I see
on electrics you use a flatline no curve
or you use a governer with a flatline, depending on what the manual says for the ESC the % throttle may vary but it is usualy flat

keeping in mind the gyro you listed isn't the best quality
another thing to try would be pitch to tail mixing (depends on radio) so it gives right rudder when punching the collective.

106T ok what about the small gear that drives the tail is it right 1 ?

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08-05-2011 11:39 PM  6 years agoPost 13
CF1

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Olympia, WA

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I didn't count but I'm sure it is. Otherwise the two gears wouldn't mesh. Back when they changed the gear ratio you had to swap those two gears together. I've been flying with this 401 for four years and have never had problems. Used to run it off an HS81 and it was great. Switched to the DC420 because someone said I needed to. Had problems ever since.

On my original question the answer is that I shouldn't worry about it just set the end points of the throttle curve at 100% linear correct?

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08-06-2011 01:09 AM  6 years agoPost 14
CX1

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Canada

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if your gonna use curves then yes

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HelicopterBeginners Corner › Adjusting throttle curve at full pitch
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