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HelicopterMain Discussion › Heli falls during Break in
03-11-2003 11:01 AM  14 years agoPost 1
bluefronted

rrVeteran

Pretoria, South Africa

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Hi guys ,

Whilist breaking in my OS32SX-H on my Ergo30 SS , my heli fell down / dropped altitude on its own , although my throttle was fully open,

My main needle was set at slightly below one full turn open.This happened on the 3rd tank of fuel.My guess is that it was too lean and overheated

Yesterday I opened the needle to 1 and a quarter , I cannot get enough height , but thats fine as I am still running this engine in.As I close the needle it gets more powerful

My concern is , did I damage the engine in any way , when the needle was less then one turn open when it overheated

I use a full castor blend with 18% castor , 15% nitro.I also found out that the OS32SX-H engines are not ringed.

What tests can I do to see if this engine was damaged

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03-11-2003 11:07 AM  14 years agoPost 2
FinnDave

rrElite Veteran

Kouvola, Finland

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I think you are still too lean for a new engine. I would also consider changing from castor to a synthetic oil based fuel. If the engine still has good compression it is probably OK, it sounds as if it was only a short lean run.

David S., Kouvola, Finland

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03-11-2003 11:17 AM  14 years agoPost 3
bluefronted

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Pretoria, South Africa

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If I open the needle any more then I cannot get the thing to pick off the ground and hover ,At the moment I am at 70% throttle on the curve and +6 for hover pitch , any lower then it refuses to lift off.

80 to 90% or more of the r/c pilots in South Africa use a full castor blend , they say its safer for a lean run and castor has a higher temp tolerance then synthetic.

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03-11-2003 11:58 AM  14 years agoPost 4
Twobeers

rrKey Veteran

Toronto, Canada

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How did you measure the pitch, at 70% throttle with 6* of pitch it should almost going into orbit. I would suspect that something is amiss in your mechanical setup.

I lost my infamous tag line.

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03-11-2003 12:09 PM  14 years agoPost 5
texmurphy

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Noristown PA.

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these engines run 1 turn out plus or minus 2 or 3 clicks
at sea level depending on temp

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03-11-2003 12:21 PM  14 years agoPost 6
bluefronted

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Pretoria, South Africa

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Yes , at +/- 1 turn open it does rocket up , but at 1 and quarter open it is sluggish , I was told by a guy on http://www.rcuniverse that , during the breaking in phase 1 and a quarter will be too rich .I am flying at 1700 meters above sealevel,

I also found out that the engine is ringed , it is an OS32SX-H ringed pull start

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03-11-2003 01:57 PM  14 years agoPost 7
bluefronted

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Pretoria, South Africa

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The heli is an Ergo30 SS , The radio is a Futaba 9ZAP WC2 ,

The SWH , swash type, is on SR3 ( for CCPM) , the AIL and ELE RATE are on +60 , the PIT RATE=-30 ,I,ve played with the PIT RATE from -10 to -100 to get my radios pitch curve for -2 and -3 and low as possible on the curve.

The low pitch is on -3 degrees
Mid Pitch = +6
High = +10 ,

JR Manual suggests -2 , 5-6 , +10 for hover.

At -3 my radios pitch curve is on 30%

Throttle:0 , 70 , 100%,

Using 18% Castor , 15% Nitro

Engine:OS32SX-H ring pull start , only has 5 tanks through it.Although the heli is 4 months old , the previous webra 32F , had heat seizure problems on the carb , and blew a muffler.I have a Voyager50 and a Vigor CS set on the 9ZAP.

***Seems that this site is more awake then rcuniverse

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03-11-2003 02:48 PM  14 years agoPost 8
Jamovich

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Bangalore, India

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Interesting

I also have the O.S. 32 Sx-H. I have also been having problems with tuning the engine, which sound similar. Since I am in India, there are no pre-mixed fuels, so I use full blend castor oil. I am thinking that this is an issue with gumming. I had more than 5 tanks run on it...about maybe 10+. The heli did suddenly lose power above 50% throttle...and would refuse to lift off the ground. If I did push it above 50% the engine would soon die. Unlike you I was unsucessful in ever getting the heli off the ground thereafter...I managed to damage my starter shaft after an hour of frustration with that cursed needle...so I have to wait 20 days for replacement parts. I suggest you tune it on a testing stand (I am going to run 5 tanks through it this time!!!), and use First Pressed Degummed Grade Castor Oil, instead of that pharmacy stuff u are probably using. In fact I suggest using that oil with a slight mixture of synthetic..80/20 ratio. Or use after-run oil after EVERY flight. I did happen to open up my engine, and it had a solid midnight black coating of gum. I think heli engines run alot hotter and harder than planes..but I might be wrong.

Jamovich

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03-11-2003 04:37 PM  14 years agoPost 9
bluefronted

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Pretoria, South Africa

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Very few people here in South Africa using medical grade Castor oil , we use first press.Try Castrol M , that is the genuine stuff !!!

If I used full synthetic oil , i would of been in trouble , with my lean run , I use full synthetic with my Vigor CS , I don't mind the gum

Increase your hover throttle to 70% and pitch to +6 , it will lift off , with your main needle +/- 1 to 1 and two or 3 clicks open.

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03-11-2003 06:15 PM  14 years agoPost 10
sebastianforbes

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the wallops, hampshire, england

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hi there

i had an issue with my os32 pullstart. it fell out of the sky !

1) i stopped using coolpower and went to pro synth 15 %.
2) i fitted a fuel filter

i cannot say for certain which solution solved the problem but i have never had a problem since at one turn out.

you are right about the tolerances of castor oil - it is more tolerant of heat and stress if not tuned correctly and it has a higher temperature resistance.

i would go 1 - 5 clicks past one turn and just fly normal circuits or hover.

they are very much fit and forget.
.

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03-11-2003 07:51 PM  14 years agoPost 11
texmurphy

rrNovice

Noristown PA.

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1-1/2 turns with 30% might be ok but to mutch for 15%
and the higher the altatude the leaner you want to be
find a spot between 1 and 1/4
make sure your low end is right might be lean there the low end works
almost to half throtle
idle the engine and pinch off the feul line. if the engine dies with in 1 or 2 seconds your to lean

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03-11-2003 08:15 PM  14 years agoPost 12
bluefronted

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Pretoria, South Africa

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At one turn open , when I pinch the line the engine revs up , I also closed the needle fully and blew into the inlet port , it was closed.

Makes me wonder if the needle on the 20C carb of the OS32SX-H is of the correct type.The engine is / was new , but it was bought from a guy who bought it from someone else.

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03-12-2003 02:17 PM  14 years agoPost 13
CeeJay

rrNovice

Alexandria, LA - USA

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You will find that the HS needle will need to be about 1 and 1/8th turn open for 15% at you altitude. Now, on the LS needle, it will need to be real fat. So rich that the bird will barely idle.

Like TexMurphy said, do the pinch test with it at Idle. The rule I use is, When I pinch the line, I want 4 or 5 seconds BEFORE the engine starts to speed up from being lean.

If it speeds up as soon as you pinch, (Like I understand yours did), then it is WAY too lean on the LS needle. You need to open the LS needle in 1/16th turn increments untill you can get that 3-5 seconds before the idle rpm increases after you pinch close the line.

The LS needle actually has more effect on the hover mixture than the HS Needle. If the LS is not rich, the os32sx will be lean in hover and it will overheat.

Good luck.

CJ

CeeJay

I love livin' in MudBug Haven!

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03-31-2003 11:03 AM  14 years agoPost 14
bluefronted

rrVeteran

Pretoria, South Africa

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Problem Solved

As recommended I tried , playing with the pitch and throt curves , changed fuel between 10 to 20% nitro , changed fuel brands , changed plugs , even tried glass blades with little success , the heli just did not have enough power to climb and was sluggish on the top end of the stick.

I was about to order a new engine when a mate suggested that I try changing the muffler , I was reluctant to do so , " what more can a muffler do".I changed the hirobo muffler that the engine came with an old Hatori muffler , that I had lying around

Waalaaa , problem solved , the heli has almost 2 times the power as before , it rockets up with the upper pitch at 9.
I was supplied the hirobo muffler with the OS32SX-H engine as the hobby shop did not have any other mufflers at that time in stock.This hirobo muffler even caused the engine to overheat at times.

I think it is not compatible with the Os engine

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04-04-2003 11:33 AM  14 years agoPost 15
bluefronted

rrVeteran

Pretoria, South Africa

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I also posted this topic on http://www.rcuniverse.com and was told by one of the guys that , the incompatibility of the mufflers could be or is due to some resonance of the muffler and the engine.

Does this make sense ,if so where can I get more info on exhaust resonance.

Thanks again

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04-04-2003 12:11 PM  14 years agoPost 16
Christian

rrApprentice

Boston, MA

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I would be careful of what you learn over on RCU, just yesterday I saw someone telling someone else that the MinAir Tempest head is not in production yet

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04-13-2003 05:55 PM  14 years agoPost 17
duke666

rrKey Veteran

Hampshire, UK

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IT WAS ME THEY TOLD THAT THE HEAD WASN'T AVAILABLE. I'D HAD THE THING IN MY HANDS FOR ABOUT A MONTH. BETTER STAY HERE IN FUTURE...

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HelicopterMain Discussion › Heli falls during Break in
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