osLA46 engine cut down

by mubashar kazmi
(islamabad.pakistan)

helo sir,

my name is kazmi,and i am having osLA46,blue colour engine.

many time my engine off during the flight.
can you please help me to solve this problem.

truely
kazmi

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osLA46 engine cut down

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Mar 18, 2009
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Need a little more info
by: Matt

Hello Kazmi,

Man, don't you hate dead stick landings over and over? It's terrible...

In order to help figure out whats wrong with your engine I need a little more info.

There are many things that could be causing your engine to quite. It could be too lean, too rich, or it could be a problem with the fuel line clunker, or fuel tubing.

In rare cases there could actually be something wrong with the carburetor not sealing correctly. Or it's possible it something wrong with one of the components of the engine.

In order to troubleshoot we need to narrow it down a bit. In order to do that we need to know exactly when the engine quits.

Does it quit when you go from idle to full throttle? Or does it quit when the engine is idling?

What happens if you have a friend hold your plane with the nose in the air while you go from idle to full throttle quickly. Does it die right away? Does it stutter and stumble then run OK? Or does it run perfectly fine?

I'd also recommend you read through the tuning page on this site.

Please take the time to perform a pinch test. This will also give you an idea if the engine is too rich or too lean.

If you determine that your engine is either too rich or too lean, adjust it accordingly and see if this solves the problem.

Please let me know what you find out.

Good Luck!

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Mar 18, 2009
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Submitted by: Matt

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Hello Kazmi, Man, don't you hate dead stick landings over and over? It's terrible... In order to help figure out whats wrong with your engine I need a little more info. There are many things that could be causing your engine to quite. It could be too lean, too rich, or it could be a problem with the fuel line clunker, or fuel tubing. In rare cases there could actually be something wrong with the carburetor not sealing correctly. Or it's possible it something wrong with one of the components of the engine. In order to troubleshoot we need to narrow it down a bit. In order to do that we need to know exactly when the engine quits. Does it quit when you go from idle to full throttle? Or does it quit when the engine is idling? What happens if you have a friend hold your plane with the nose in the air while you go from idle to full throttle quickly. Does it die right away? Does it stutter and stumble then run OK? Or does it run perfectly fine? I'd also recommend you read through the <a href="http://www.hooked-on-rc-airplanes.com/nitro-engine-tuning-tips.html">tuning page</a> on this site. Please take the time to perform a <a href="http://www.hooked-on-rc-airplanes.com/nitro-engine-tuning-tips.html#1">pinch test</a>. This will also give you an idea if the engine is too rich or too lean. If you determine that your engine is either too rich or too lean, adjust it accordingly and see if this solves the problem. Please let me know what you find out. Good Luck!

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Apr 21, 2009
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engine cutdown
by: kazmi

helo dear.
i have done everything wich you told me for my engine.i also did the pinch test,but all in vane.
i have done all ground tests of my engine,but the engine still having problem.last sundy my engine was off during flight 2 times.

Apr 21, 2009
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That's not good...
by: Matt

Kazmi,

I'm sorry to hear that your engine is still giving you troubles.

It is difficult to help you determine the problem without more detailed information. It is much like calling a doctor to heal you when all you tell him is that you are sick.

I really want to help you fix your problem because I know how frustrating it can be when you want to fly, and your engine keeps quitting.

Like a doctor, I need to see more details of the symptoms your engine is displaying.

I will ask again some of the same questions.

Does it quit when you go from idle to full throttle? Or does it quit when the engine is idling?

What happens if you have a friend hold your plane with the nose in the air while you go from idle to full throttle quickly. Does it die right away? Does it stutter and stumble then run OK? Or does it run perfectly fine?

What exactly happens when you do the pinch test? Does RPM's rise before engine dies? Or does it quite immediately?

Please give me some more details of how the engine behaves when it is running on the ground and hopefully we can get to the bottom of this.

Another suggestion is to find someone in your area that could help you hands on.

Please see the list on this page for RC airplane clubs in your area.

Pakistan RC airplane clubs
and flying fields

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Apr 21, 2009
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Submitted by: Matt

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Kazmi, I'm sorry to hear that your engine is still giving you troubles. It is difficult to help you determine the problem without more detailed information. It is much like calling a doctor to heal you when all you tell him is that you are sick. I really want to help you fix your problem because I know how frustrating it can be when you want to fly, and your engine keeps quitting. Like a doctor, I need to see more details of the symptoms your engine is displaying. I will ask again some of the same questions. Does it quit when you go from idle to full throttle? Or does it quit when the engine is idling? What happens if you have a friend hold your plane with the nose in the air while you go from idle to full throttle quickly. Does it die right away? Does it stutter and stumble then run OK? Or does it run perfectly fine? What exactly happens when you do the pinch test? Does RPM's rise before engine dies? Or does it quite immediately? Please give me some more details of how the engine behaves when it is running on the ground and hopefully we can get to the bottom of this. Another suggestion is to find someone in your area that could help you hands on. Please see the list on this page for RC airplane clubs in your area. <a href="http://www.rc-airplane-world.com/pakistan-rc-airplane-clubs.html" target="_new">Pakistan RC airplane clubs and flying fields</a>

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Apr 22, 2009
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engine cut down
by: kazmi

hi matt,kazmi here again.
i want to provide you some more information about my engine.
i performed all actions at ground as per you advise.i did not found any problem.pinch test was also perfect,but during the flight i saw that i pull down the throtul stick untill 50% and engine cut down.but at 80%90% throtul,the engine was perfect.
kazmi

Apr 22, 2009
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Hmm, maybe low speed?
by: Matt

Hi Kazmi,

So you are telling me that the engine runs OK at nearly full throttle, but the engine quits when lower the throttle no near 50%?

Does it seem to happen the same way each time?

This is still a tricky one to diagnose. But it sounds like the issue could be the low speed needle too lean.

Try increasing the low speed need until the airplane Almost starts to move forward on the ground at zero throttle.

Keep in mind that you may have to readjust the high speed after tweaking the low speed.

This is kind of a trial and error process. Try that and let me know if it helps.

Apr 23, 2009
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my engine
by: kazmi

hi matt kazmi here.

matt i am really happy of you coz you always guide me in a good manners.God bless you.

matt.i need two more suggestions from you.
1;i have an another engine,super tiget, wich i recently purchased this engine. this engine is already mounted at aeroplane.and i perchased the plane along with this engine.what kind of engine is it?

i mean that, is it a good engine are not?

2;even still i am intrusted to purchase another engine,name(GMS). is it good are not?

matt i will wait for your favourable reply.
you truely

kazmi.

Apr 23, 2009
Rating

Engines
by: Matt

Hi Kazmi,

There have been many of good people help me when I have questions. The least I can do is to help others when I have the chance. I am glad you appreciate my responses.

Super Tiger is a very reputable company. Do you know what size and model it is?

Here is their product page, can you find it here?

To be really honest with you, I haven't had any personal experience with GMS engines. However, I found this thread that you may like to read to help you make your decision.

GMS Engines Thread on RC Groups

Hope this helps!

Matt

Apr 24, 2009
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engines
by: kazmi

hi matt kazmi here.
my super tiger engine is 40 size.
kazmi

May 08, 2009
Rating

engine cutdown
by: kazmi

hi matt.kazmi here again.how r u.
matt i went for flying today.with my plane and GMS40 engine.last sunday i flew my plane nicely but today you know what happend,,,,
i start my plane at same settings but when i push the throthel for full rpms my engine became off.i tried again but not succeded.it happend for 6 times that i started the engine and engine cutt down on full throttel after few seconds automatecully.i checked the fuel lines,but every thing was fine,further more i changed the fuel tank in the field but all in vain.
after all i made a phone call to my friend to get the help.he asked me that you chang your glow plug.i changed the glow plug and after that engine stared to response.
after 2 minuts my plane was in the air.but after more 5 minuts the engine cutt down again during the flight.and i landed my plane safely.
matt can you guid me about this problem plz.
best regards
kazmi

May 09, 2009
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right glow plug?
by: Matt

Wow Kazmi,

You are not having much good luck with that engine! Is this the same engine, or a new one you bought?

Did you check the engine manual to make sure you are using the correct glow plug?

Again, I would double check the pinch test to make sure that your engine is not too rich.

How far does your friend live that you called on the phone? Could you take the plane to his house and let him help you hands on?

May 10, 2009
Rating

engine cut down
by: Anonymous

hi matt,
i have checked every thig.this engine is brand new.and i rencently break in.
i have two more friend alongwith me but they are same like me.my expert friend is 500km away from my city..
regards
kazmi