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HelicopterMain Discussion › OS 50 Throttle Curve
12-17-2003 08:40 PM  13 years agoPost 1
hercules

Senior Heliman

Pittsburgh, Pennsylvania - USA

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First, I want to appologize for puting this in the Main Discussion, I wasn't sure if it goes under Radios or Engines so it ended up here.

What do you have your throttle curves set to when using the OS 50. I ask this because as I went from very rich break-in to a leaner, but still safe, carb setting I constantly lowered my throttle curve to keep head speed down. When I started, the heli wouldn't even lift off the ground untill it had 75% throttle barrel opening at 6 deg pitch set for half stick. Now my throttle curve in my JR8103 for normal mode and a hover point at a hair over half stick is points L=0, 1=28, 2=38, 3=48, H=100. I didn't worry about high stick because its in normal mode which I use to hover. This gives me a head speed of about 1600 rpm at half stick and 6 deg pitch. The engine runs great and produces a temp. on the head next to the glow plug of 190 deg. What are your throttle curve points like?

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12-17-2003 09:26 PM  13 years agoPost 2
Doug

Elite Veteran

Port Saint Luice Florida....

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On my Raptor 50 I use 84 40 35 40 84 and a 20% cyclic mix any higher and it overspeeds in a hard climb.

First member of Member of Bearings Anonymous

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12-17-2003 11:52 PM  13 years agoPost 3
hercules

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Pittsburgh, Pennsylvania - USA

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Thanks for the replies.

Adrian.law, I've been flying for 3 years, no problems. I've heard of others with really low settings, but nobody seems to mention them. I thought it would be interesting to see what others had to do with their settings. The only other place I saw settings listed was on Raptortechnique and his are no higher than mine for the OS50! Like I mentioned above the heli and engine work perfectly(great). I'm happy with my setup and am not looking to change it. It does anything I ask of it. I didn't intend to give the impression of a Newbe, so I appologize for misleading you!

Doug, my idle-up 1 is set similar to yours. I got 80,43,38,43,80. Thanks!

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12-18-2003 12:15 AM  13 years agoPost 4
Al Magaloff

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I would put the 6º of pitch at 3/4 stick, not 1/2. Doug, are your numbers for 3/4 hover?

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12-18-2003 12:46 AM  13 years agoPost 5
MJWS

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Airdrie, AB - Canada

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I had a similar experience to yours. Throttle curves were very very low initially to get 1550-1600 on the head with 6 deg pitch in a hover. I double and triple checked linkage geometry looking for some sort of anomoly. Everything was square and linear, curves were still sitting around 35%-70% at full pitch 10 deg with no bogging.

I used raptortechnique to set up my throttle/cyclic mixing, mechanically, so I couldn't overdrive my throttle servo. Changed my pitch and throttle curves to 3/4 stick hover and the values got slightly more traditional. Ended up at 90, 55, 45, 55, 90 with 20% mixing.

It really put a smile on my face as I was leaning it out from an extremely rich break in to normal. The throttle curve just kept dropping and dropping, I thought I'd never be able to use all that power.

Heh, now all I can think about is a souped up 90.

Mike

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12-18-2003 12:49 AM  13 years agoPost 6
JuanRodriguez

Elite Veteran

The Villages, Florida

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hercules

I agree with Al in that you would be better off setting your heli with the "traditional" 3 D style curves.....Also referred to as the "Mas Technique" (oh boy, here we go again !!!!! ie, 0 degrees of pitch at 50 % of stick travel.........then tailor your throttle curve to suit.......

1600 RPM is way too low for my liking..... We try to shoot for a head speed of 1750-1800 to enable a "crisp" feel to the machine for aerobatics and 3D...... anything else than that and the machine will feel as though it's always behind the power band.......

Lastly, please realize that I am in NO way trying to break your stones about this......... You say you are perfectly happy with the way your setup works for you........ That being said, I would not bother changing a thing....Nothing wrong with seeing what others are doing, though..... that's how we all learn of different techniques......

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12-18-2003 01:06 AM  13 years agoPost 7
hercules

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Pittsburgh, Pennsylvania - USA

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Al and MJWS,

My Idle up curve is for 3/4 stick. Actually, its just below. There is a point where the two curves cross so when I hit the Idle up switch from normal to position 1, the heli doesn't change position or RPM, then I go flying from there. I know where it is by feel after lift off, never bothered to look. Do you think it would be better to change the normal position to hover at 3/4 stick too, or just stay with my curent setup if its not that big a deal? I am always open to options and reasons.

Al, I'm going to try and get some pics of my Raptor. I modified a Robbe tail fin to use instead of the stock one. So far so good, even with the wire extension that the fin came with ( thats lifting off in the grass! Of course its snow after the other day.). Also, the deans antenna is working good. No problems so far.

Juan, thanks! Thats actually why I posted! Just curious what others are doing!


Thanks for the info!

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12-18-2003 01:37 AM  13 years agoPost 8
MJWS

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Airdrie, AB - Canada

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I didn't find the switch from half stick hover to 3/4 to be bad at all. Takes maybe half a tank on the heli if you fly 3d on your sim. I like the simplified method of 0 at center stick in all modes so the heli doesn't jump. All my pitch curves are matched with that in mind along with a minor RPM change.

I like 1600 in normal, 1750 idle 1, 1850 idle 2. I think those are fairly stock head speeds for the 50, atleast by what I've seen on this forum.

Seems to be personal preference and flying style for most of this stuff. I never intended to fly lots of circuits or scale so switched very early to a 3/4 stick setup.

Mike

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12-18-2003 02:23 AM  13 years agoPost 9
Doug

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Port Saint Luice Florida....

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Yes 3/4 hover

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12-18-2003 02:47 AM  13 years agoPost 10
hercules

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Pittsburgh, Pennsylvania - USA

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Doug, Al, everybody...

I hope I'm not opening a can of worms here, but since this thread is evolving into something a little different than it was intended to be, I may as well ask...whats the benifit to 3/4? When I began learning I was told to set the heli up with 1/2 stick. With that said, I remember having to fight to get 1/2 stick settings with the mechanical linkage on the throttle. Recently, when I upgraded all my servos, I ran into the same problem again with the throttle linkage on the OS 50. I resolved the linkage problem and can place it anywhere I want it now through the radio. The collective range I have to work with is a measured -10 to +10. I don't go past -9 or +9 in any of my curves ( swashplate gets mighty close to the collar on the main shaft at -10). So, I can change my hover point through the radio and am willing to experiment with 3/4 stick. Just wondering, because back then I never asked about why 1/2 stick and took their word on it. Thanks for giving me another perspective!

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12-18-2003 03:15 AM  13 years agoPost 11
EChapkis

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Tampa, FL

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setup is the issue

Your problem is the setup.

Doesn't matter if you run -9,0,9 or -6,6,9 on the pitch, the linkages are not right.

Set the radio in idle up 1 first.

Mechanically, you should get -9,0,9 at 100% ATV. Set the throttle linkage to 50% carb opening. Make sure your ATV's are at 100%. If you must adjust them, you increase or decrease both top and bottom ATV equally. Keep adjusting the linkages until you get it right.

Once that is done, now go back to Normal mode and set it for -6,6,9.

You will find that the setting will have some weird numbers because the linkages are fully symetrical.

I should have mentioned this earlier.... make sure all linkages, arms, ect. are 100% 90 degrees to each other.

I personally set Normal mode to -6,5,12 on my Freya 91. Idle up 1 and 2 are set the same, -11,0,12. The difference, I use a GV1 and set the head speed for each, Idle up 1 is 1750 and 1850 on idle up 2. GV1 is disabled in Normal mode.

Hope that helps.

Evan Chapkis Tampa, Florida

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12-18-2003 03:20 AM  13 years agoPost 12
Doug

Elite Veteran

Port Saint Luice Florida....

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And you will find it tricky to hover both upright and upside down at 1/2 stick

First member of Member of Bearings Anonymous

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12-18-2003 03:31 AM  13 years agoPost 13
Al Magaloff

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Upside down??? Do these things fly upside down??

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12-18-2003 03:46 AM  13 years agoPost 14
hercules

Senior Heliman

Pittsburgh, Pennsylvania - USA

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Echapkis,

Mechanically, I have -10,0,+10. I set mine up using idle-up 1, too, so I had a nice linear pitch curve. All my linkages are 90 deg and started with 100% ATV's then tweeked them from there to get full range of travel without binding or parts touching, given the servo arm length I'm using, and ended up with pitch ATV's of 120% on the top and bottom.

My throttle is mechanically setup to get fully closed with the trim full down and stick full down, 50% stick gives 50% throttle opening, and full open at full up stick using a linear setup throttle curve from 0 to 100. My throttle ATV's are 80% down and 80% up. I then adjusted my points to get my current throttle settings.

So, I'm certain that my mechanical setup is correct.

All I noticed is as I leaned the engine out my head speed increased so I had to lower my throttle curves. I'm just amazed at the low throttle setting due to the power of the engine.

Thanks for the reply! I'm begining to think I'm one of the few with real low throttle settings. Also, I think it is a result of the relation of my pitch curve being half stick to my throttle curve.

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12-18-2003 03:51 AM  13 years agoPost 15
hercules

Senior Heliman

Pittsburgh, Pennsylvania - USA

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Al,

According to Einstein it relative to the observer!

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12-18-2003 03:51 AM  13 years agoPost 16
Al Magaloff

rrMaster

12,199 Posts- Enough Time Wasted. See Ya!

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The power of the 50 is not at all linear. Your low hover throttle setting reflects this. Gassers are much the same, with 30-35% throttle at hover. I would raise the headspeed as Juan suggests. We do find that Raptors come alive at 1800-1850. My Rap46 with 550 blades is well over 2grand.

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12-18-2003 03:55 AM  13 years agoPost 17
Al Magaloff

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According to Einstein it relative to the observer! So if Henry Caldwell can fly with the transmitter behind his back, I think I'll try hovering while standing on my head! Look mom, I'm flying inverted.

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12-18-2003 04:04 AM  13 years agoPost 18
hercules

Senior Heliman

Pittsburgh, Pennsylvania - USA

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Sound like your in for a "HEAD"-ache!

OK, I know its a bad one!

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HelicopterMain Discussion › OS 50 Throttle Curve
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