DA 50 quits during basic tail spin or slow flight

RavenHawk · 05-23-2007, 12:46 PM

I have a new DA 50 with about 3 gallons of fuel through it.. It runs great with one exeception. It will quit during a basic tail spin. I tried increasing the throttle trim prior to take off so the idle speed would be high but the engine will still quit. I have a friend who has the exact same setup plane & engine and he does not have this problem.

I am using Lawnboy ashless at about 32:1 to 40:1 for the break in period. My friend has used Amsoil 100:1 oil at about 90:1 for the life of the engine, he has had no trouble at all.

Any Ideas?

hawk21 · 05-23-2007, 01:04 PM

have you adjust the needles yet? maybe the low is rich

RavenHawk · 05-23-2007, 01:22 PM

I have been adjusting the needles slowing as the engine has been lossing up. I will double check the low & high end again. Thanks

caurimare · 05-23-2007, 02:40 PM

	Quote: Originally Posted by RavenHawk
	I have been adjusting the needles slowing as the engine has been lossing up. I will double check the low & high end again. Thanks

You should only be adjusting the low end, leave the high the just as it came from factory I think is 1 7/8 or 1 5/8

Al Czervik · 05-23-2007, 03:02 PM

From my experience having just broken my first DA-50 in...lean out the low end a little. I had the same situation breaking mine in. Get the idle set so the engine will have a solid idle at mid trim on the throttle.

Then set your throttle end point on your radio so it will cut off once you bring your trim on your radio all of the way down...just one way to do it.

snap · 05-23-2007, 09:28 PM

	Quote: Originally Posted by RavenHawk
	I have a new DA 50 with about 3 gallons of fuel through it.. It runs great with one exeception. It will quit during a basic tail spin. I tried increasing the throttle trim prior to take off so the idle speed would be high but the engine will still quit. I have a friend who has the exact same setup plane & engine and he does not have this problem. I am using Lawnboy ashless at about 32:1 to 40:1 for the break in period. My friend has used Amsoil 100:1 oil at about 90:1 for the life of the engine, he has had no trouble at all. Any Ideas?

You break in is correct.your low end is too leen.Pull any hi g manuver and if its to lean it will sound like its bogging down for a sec. or it will die. In a nitro motor this typicaly would mean your to rich in gasoline motors its the opposite.When you richen the low end only do it 1/16 of a turn out very small increments.

3DGE 540 · 05-23-2007, 09:52 PM

One thing I noticed about my DA-50 is that if I go from full throttle to idle really fast the idle will be very fast for a around 6 seconds then sag down to a lower rpm by itself. While I was flying today I noticed that my idle was too high so I made it lower on the trim then once I did a long downline I pulled out and it was dead. Could this also be because my low end being to rich?

snap · 05-23-2007, 10:44 PM

	Quote: Originally Posted by 3DGE 540
	One thing I noticed about my DA-50 is that if I go from full throttle to idle really fast the idle will be very fast for a around 6 seconds then sag down to a lower rpm by itself. While I was flying today I noticed that my idle was too high so I made it lower on the trim then once I did a long downline I pulled out and it was dead. Could this also be because my low end being to rich?

No. low end is to lean.That surge is the motor telling you it's starved for fuel.If you squeeze the fuel line while the engine is running for a second or two you will hear it surge.

Edge540T_Flyer · 05-24-2007, 12:35 AM

Guys, for excellent advice tuning a DA50, read the article below:
http://tech.flygsw.org/walbro_tuneup.htm

and also follow this thread
Gas engine tuning for newbies....

snap · 05-24-2007, 01:29 AM

Nice article.Considering these are da motors and and fairly new its unlikely there's a needle or diaphram problem.start with richening your bottom end you wont damage the motor(no harm no foul) if that fails then you might be looking @ a tear down. Idought it though I have 4 Da 50's a couple of 3w 's an 2 zdz's they all exibit the same problems when I lean the bottom out to quickly.

RavenHawk · 05-24-2007, 10:53 AM

Now I am confused, one says the low to rich the other to lean I think I will call DA..

RavenHawk · 05-25-2007, 10:22 AM

The link http://tech.flygsw.org/walbro_tuneup.htm is very informative. I have contacted DA, the factory settings for the Low needle is 1 3/4 turns out and high end is 2 turns out. I will reset the needles to factory settings then following the tuning procedures in the link.

Thanks Guys....

05-23-2007, 12:46 PM	#1 (permalink)
RavenHawk Flyin' Around Join Date: Oct 2006 Location: franklin, ohio Posts: 13	DA 50 quits during basic tail spin or slow flight I have a new DA 50 with about 3 gallons of fuel through it.. It runs great with one exeception. It will quit during a basic tail spin. I tried increasing the throttle trim prior to take off so the idle speed would be high but the engine will still quit. I have a friend who has the exact same setup plane & engine and he does not have this problem. I am using Lawnboy ashless at about 32:1 to 40:1 for the break in period. My friend has used Amsoil 100:1 oil at about 90:1 for the life of the engine, he has had no trouble at all. Any Ideas?

05-23-2007, 01:04 PM	#2 (permalink)
hawk21 Super Contributer Join Date: Mar 2006 Location: Aguadilla, Puerto Rico Age: 27 Posts: 137	Re: DA 50 quits during basic tail spin or slow flight have you adjust the needles yet? maybe the low is rich

05-23-2007, 01:22 PM	#3 (permalink)
RavenHawk Flyin' Around Join Date: Oct 2006 Location: franklin, ohio Posts: 13	Re: DA 50 quits during basic tail spin or slow flight I have been adjusting the needles slowing as the engine has been lossing up. I will double check the low & high end again. Thanks

05-23-2007, 03:02 PM	#5 (permalink)
Al Czervik Uber Contributer Join Date: Jan 2006 Location: Sterling, VA Age: 37 Posts: 187	Re: DA 50 quits during basic tail spin or slow flight From my experience having just broken my first DA-50 in...lean out the low end a little. I had the same situation breaking mine in. Get the idle set so the engine will have a solid idle at mid trim on the throttle. Then set your throttle end point on your radio so it will cut off once you bring your trim on your radio all of the way down...just one way to do it.

05-23-2007, 09:52 PM	#7 (permalink)
3DGE 540 Huck It Low Join Date: Jan 2006 Location: Ontario, Canada Posts: 181	Re: DA 50 quits during basic tail spin or slow flight One thing I noticed about my DA-50 is that if I go from full throttle to idle really fast the idle will be very fast for a around 6 seconds then sag down to a lower rpm by itself. While I was flying today I noticed that my idle was too high so I made it lower on the trim then once I did a long downline I pulled out and it was dead. Could this also be because my low end being to rich? __________________ Theres Only 1 Way To See If Your Plane Is Strong... BLENDER!!!


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05-24-2007, 12:35 AM	#9 (permalink)
Edge540T_Flyer Does it always do that? Join Date: Jan 2006 Location: Confused,FL Age: 44 Posts: 804	Re: DA 50 quits during basic tail spin or slow flight Guys, for excellent advice tuning a DA50, read the article below: http://tech.flygsw.org/walbro_tuneup.htm and also follow this thread Gas engine tuning for newbies.... __________________ www.qqaircraft.com www.desertaircraft.com www.ffaa3d.com Florida Freestyle Aerobatics Association www.triplecreekrc.com Home Of TC3D '09 April 10, 11 & 12

05-24-2007, 01:29 AM	#10 (permalink)
snap Bad-ass Super Contributer! Join Date: May 2006 Location: el cajon Age: 45 Posts: 520	Re: DA 50 quits during basic tail spin or slow flight Nice article.Considering these are da motors and and fairly new its unlikely there's a needle or diaphram problem.start with richening your bottom end you wont damage the motor(no harm no foul) if that fails then you might be looking @ a tear down. Idought it though I have 4 Da 50's a couple of 3w 's an 2 zdz's they all exibit the same problems when I lean the bottom out to quickly.

05-24-2007, 10:53 AM	#11 (permalink)
RavenHawk Flyin' Around Join Date: Oct 2006 Location: franklin, ohio Posts: 13	Re: DA 50 quits during basic tail spin or slow flight Now I am confused, one says the low to rich the other to lean I think I will call DA..

05-25-2007, 10:22 AM	#12 (permalink)
RavenHawk Flyin' Around Join Date: Oct 2006 Location: franklin, ohio Posts: 13	Re: DA 50 quits during basic tail spin or slow flight The link http://tech.flygsw.org/walbro_tuneup.htm is very informative. I have contacted DA, the factory settings for the Low needle is 1 3/4 turns out and high end is 2 turns out. I will reset the needles to factory settings then following the tuning procedures in the link. Thanks Guys....

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