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HomeRC & PowerAircraftHelicopterEngines Plugs Mufflers Fuel › OS 37 SZ-H Tuning problems
10-16-2011 04:31 AM  7 years agoPost 1
fernando13e

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Maturin, Monagas - Venezuela

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Hi guys, good evening to all of you and welcome to my post, i hope you can help me to solve this little problem that is breaking my head, as always i appreciate any tip or suggestion you could give to me in reference to solve the issue.

Now onto the problem..

I recently noticed that my rappy makes some abrupt changes in reference to the motor, i mean, it accelerates and de-accelerates constantly, as the main tank consumes i notice that the motor RPMs are very fluctuating, however it only happens in random circumstances along the flight, i flushed my needles, washed my carb, cleaned and filtered my glow fuel, i did everything that could possibly indicate that there's moisture affecting the flight performance, and i did check too that the muffler is not loose and is nice and tight, although i have to mention that when i finish flying besides the fact that my helo is almost full of oil residue and i touch the backplate of my motor and it almost burns instantly, i can put my finger there just for a couple of seconds, im using an OS 37 SZ-H with a Curtis Youngblood Muscle Pipe on it, i checked my fuel lines and replaced ALL tubing, today one of my family members helped me on making 3 videos to show you what im talking about, maybe its something related to the high needle and low needle, at this point i dont really know whats happening.

Here are the videos that i made:
http://www.youtube.com/watch?v=dyvVynwILg4
http://www.youtube.com/watch?v=ExfhZjiKxuE
http://www.youtube.com/watch?v=K_5Krjg8qBs

Hope you can help please

Cheers to all.
Fernando

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10-16-2011 05:14 AM  7 years agoPost 2
Dingo07

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Newport Coast, CA - USA

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It sounds like your rpm is a bit high. My engine doesn't scream like that, especially not at hover. You might want to adjust your throttle curve and see if that helps.

In the third video it sounds like your clutch was slipping because the engine was still screaming but the heli dropped about 6 feet in the air, unless you were manually adjusting pitch on your radio. Is your clutch liner ok?

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10-16-2011 12:32 PM  7 years agoPost 3
fernando13e

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Maturin, Monagas - Venezuela

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The clutch is fine, in fact i did that movement with the stick, she responds pretty good to my inputs, and yes i was thinking on that one too, maybe i need to adjust the throttle curve. Thanks for the input

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10-16-2011 01:22 PM  7 years agoPost 4
airdodger

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Johnston USA

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Hard to tell in video, but if the engine is too hot richen up a few clicks and see if that helps. Use a quality plug because the less expensive plugs sometimes require you to lean the engine too much to run correct. You are using heli fuel right. You could also be right on the edge of the rpm range for the pipe also, meaning take the headspeed down some. Are you using a governor?

Chris

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10-16-2011 01:29 PM  7 years agoPost 5
fernando13e

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Maturin, Monagas - Venezuela

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In my original post i forgot to say that i dont use any governor device and im running 15% nitro, Morganfuel Coolpower Heli, how do i adjust the RPM's of my rotor?, does the throttle curve helps adjusting that?

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10-16-2011 07:06 PM  7 years agoPost 6
airdodger

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Johnston USA

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That is correct the throttle curve and pitch curves work together. I would still try a richer setting if the engine is as hot as you say. What plug are you using?

Chris

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10-16-2011 08:56 PM  7 years agoPost 7
fernando13e

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Maturin, Monagas - Venezuela

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I'm using OS Number 8 Glow Plug wich is pretty new, i only made 6 or 7 flights with it and i tried playing with the needles and no effect, maybe i need to play with the throttle curve, do you know what curve i can use?, im only a beginner, i can do some hovers and pretty basic forward flights. Thanks

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10-16-2011 09:31 PM  7 years agoPost 8
Dingo07

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Newport Coast, CA - USA

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I have a SCEADU EVO. Here's my Pitch and Throttle curves, set up for basic flight, no 3D. I used a JR XP8103 before Friday, and have now upgraded to a X9503 DSMX because of a crash from losing signal.

Pitch Curve............|........Throttle Curve
Point L - 23%........|........Point L - 0%
Point 1 - 43%........|........Point 1 - 25%
Point 2 - 61%........|........Point 2 - 50%
Point 3 - 80%........|........Point 3 - 70%
Point H - 95%........|........Point H - 100%

Another factor is how you mechanically have your rod lengths set up in relation to how much pitch you have, from no stick to half stick to full stick. My heli is setup to cover roughly -2 degrees to +8 degrees. You check this with a pitch guage. I should also mention that my half stick point falls near Point 3, but I can manually adjust pitch and rpm from my radio.

I'm no pro and just getting back into flying after being out for roughly 10 years, so I know there's tweaking that can be done to my curves. Perhaps they can be a starting point for you.

Hope this helps

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10-16-2011 09:56 PM  7 years agoPost 9
fernando13e

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Maturin, Monagas - Venezuela

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Thanks for the input Dingo, this is my throttle curve, I've been adjusting its the only thing left that I didn't modify, and bingo, I think we hit the nail, I lowered the RPMs of my motor and so did the rotor, now the only thing that confuses me is when I was flying I experienced a deacceleration when the tank was almost empty, however it was a slow deacceleration.. Not sudden, maybe my engine was a little hot?

These are my curves:

For throttle I use:
22..L
37..2
52..3
66..4
80..H

For pitch I use
17.5..L
39.5..2
63.0..3
80.5..4
100...H

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10-16-2011 11:00 PM  7 years agoPost 10
Dingo07

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Newport Coast, CA - USA

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It seems both your curves are off a bit. Your throttle is still a bit high at low stick. I suggest you find the manual for the heli you have, and see what it says the curves should be, and start from there. For sure you can find it online if you don't physically have it.

Glad I could help

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10-17-2011 12:46 AM  7 years agoPost 11
airdodger

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Johnston USA

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We need to know the actual pitch at the blades that correspond to the curve points. The throttle should be set so you have close to 0-100 corresponding to closed throttle to full open, or the numbers won't mean much. Throttle point 4 should be around 75 and high close to 100. Are you using normal or idle up one, also are you hovering at mid stick or three quarter?

Chris

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10-17-2011 01:43 AM  7 years agoPost 12
fernando13e

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Maturin, Monagas - Venezuela

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I measured the pitch with a pitch gauge i have, i measured -4.5 at low stick, 5 mid stick, and 10 full stick, and im flying in normal mode, everything i do is in normal mode, and im hovering at mid stick approximately.. Hope that helps

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10-17-2011 11:49 AM  7 years agoPost 13
airdodger

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Johnston USA

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When you fly in normal mode in forward flight and you reduce pitch the throttle follows and reduces throttle. To avoid this you need to use idle up so only the pitch is reduced and the engine keeps the headspeed the same. You will have to fiddle with the throttle curves to keep the headspeed close. The pitch curve you have now drops 9.5 degrees from half stick to low and 5 degrees from mid to high that is why it feels different. Most people fly with 0 at mid and the same throws on both sides. This means the throttle curve looks like a V when used in idle up..

Chris

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10-17-2011 07:00 PM  7 years agoPost 14
fernando13e

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Maturin, Monagas - Venezuela

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I want to slow down the head speed, can i achieve that by modifying the pitch and throttle curves?, if so what curves do you recommend me to use?

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10-17-2011 11:34 PM  7 years agoPost 15
Dingo07

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Newport Coast, CA - USA

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Check your PM fernando

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10-18-2011 01:29 AM  7 years agoPost 16
airdodger

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Johnston USA

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Adjust the throttle lower until you get the headspeed you are looking for, keep in mind smaller engines like to rev.

Chris

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10-18-2011 06:29 PM  7 years agoPost 17
fernando13e

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Maturin, Monagas - Venezuela

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I adjusted my throttle curve keeping in mind the values given on my rapto 30 manual, but crap.. even if i adjust my throttle curve it keeps accelerating, i suspect of overheating, i was flying 10 minutes ago and well.. i'll try to explain the situation as my english is not so good

I charged my batteries, the radio, and receiver batteries, i charged the one on my globby too, and then i fueled my raptor, one full tank, at first when i moved my stick to the hovering point i have set up with my throttle curve, at first it was flying accelerated and then it slowed down and it flew fine, good motor and rotor rpm's, UNTIL the main tank was almost empty, there was little fuel remaining on the main tank, and then it started to accelerate again and it kept that way even when it was using the header tank, i didnt care much about it and okay, i shut the engine off and refueled, when i started my engine again it started a little accelerated, and again i flew once more, this time the engine was waaaayy high, it was very accelerated and i started to notice some air bubbles on the main tank, i dont know what they mean but i think my engine is overheating, and i dont know why... i tried richening the high needle 2 clicks and did nothing... i gave it one more click and it slowed down for some seconds until it accelerated again and mantained those rpms

I have a very good smoke trail so i know its not lean

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10-18-2011 08:46 PM  7 years agoPost 18
Dingo07

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Newport Coast, CA - USA

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What are your needle settings on the carb? I would make note of them and see how they compare with the stock settings. I'm guessing that your mixture needle is not adjusted correctly and from the sound of what you describe, the engine is running lean.

What are the values for your throttle curve now?

Do you have mixing setup in the radio?

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10-18-2011 09:43 PM  7 years agoPost 19
airdodger

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Johnston USA

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Just because you have a smoke trail does not mean it is not lean.

It really smokes when its lean and burning the oil. Open the needle a quarter turn and try it.

Chris

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10-18-2011 09:49 PM  7 years agoPost 20
reddragon

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Brooklyn, N.Y.

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It really smokes when its lean and burning the oil.
It smokes regardless of it running lean or rich. It may smoke less when it is running very lean.

Wayne - Fly it like you stole it! You're in good hands with Runryder!

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