YS-63 FZ Loss of Power on Uplines  
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All Forums >> Glow Engines, Gas Engines, Fuel & Mfg Support Forums >> Engine Manufacturers Direct Support Forum >> YS Engines Support >> YS-63 FZ Loss of Power on Uplines
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YS-63 FZ Loss of Power on Uplines - 7/14/2008 6:02:43 PM   
insalacosm



Posts: 90
Joined: 4/14/2005
From: Arlington, VA, USA
Status: offline 		Hello - My YS-63 FZ has been running well since moving to 30% heli fuel but it is losing power on the uplines so I figured I would seek some advice before I start making any more adjustments. I'm running Cool Power 30% heli fuel with a 13x6 APC prop. I have about 1 gallon through the engine and have had this problem since the first flights. The engine maintains a 2k RPM idle and top RPM is 10.8k but I richened it slightly so top RPM is now 10.2k. Anyway, here's what is happening... The engine runs great through horizontal flight, but then when I pull up for loop or even on a 45, the RPMs start to drop until plane slows to a crawl (the engine never quits). The engine doesn't sound like it is leaning out, but then once I go horizontal, the RPMs increase and is starts to pull the plane around again. My thought is that the regulator needs to be richened or maybe I need to drop down to a 12x6 prop. When testing on the ground, the tranisition is good, but I did notice that it speeds up when I hit 1/4 throttle. Does this confirm that the regulator is too lean? Any ideas on where to focus my tuning are appreciated.
Thanks,
Steve
       Post #: 1

RE: YS-63 FZ Loss of Power on Uplines - 7/14/2008 6:48:20 PM   
petec



Posts: 658
Joined: 1/26/2002
From: Beaver Falls, PA, USA
Status: offline 		Did you make sure the clunk isn't stuck in the front of the tank? Always helps to verify the easy stuff before digging in.

As for being rich or lean, when rolling the throttle forward from idle to full if the engine if the engine stumbles a little and then picks up RPM it would be rich. If it goes flat and then picks up RPM it would be lean.

Here is the link to Troy's page on setting yup a YS
http://www.patternflyer.com/troy/?page_id=13

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(in reply to insalacosm)
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RE: YS-63 FZ Loss of Power on Uplines - 7/14/2008 8:09:56 PM   
dmccormick001


 

Posts: 123
Joined: 2/13/2005
From: Soddy Daisy, TN, USA
Status: offline 		I'm kinda thinkin' that the 13x6 prop is a little too much for this engine. That's the size I usually run on a 90 size engine. If I'm not mistaken, you can turn this motor upwards of 11-12k RPMs (max), so I think I'd recommend dropping down to a 12 inch prop, and see if it lets your RPMs get into the engine's power curve a little better.

David

(in reply to petec)
       Post #: 3

RE: YS-63 FZ Loss of Power on Uplines - 7/14/2008 9:50:35 PM   
petec



Posts: 658
Joined: 1/26/2002
From: Beaver Falls, PA, USA
Status: offline 		You could certainly try a 12X6 and that would be an esy first test, but speaking from experience a 13X6 on a 63FZ will turn 13,400 on 20/20 fuel at 1100' MSL. That was the prop I finally settled on for my Javelin II. Nice even speed and great verticle penetration.

What airframe is this engine in and how much does it weigh?

The suggested RPM range for the 63FZ is 10,500 - 11,500 so you can certainly lean the top end to make 10,500.

If for no other reason than to rule it out check the clunk line in the tank. Make sure it isn't doubled over forward, hitting the back of the tank or has a pinhole near where it exits the tank. It is just a strange problem for a YS to lose RPM due to change in attitude.

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RE: YS-63 FZ Loss of Power on Uplines - 7/15/2008 2:51:15 PM   
insalacosm



Posts: 90
Joined: 4/14/2005
From: Arlington, VA, USA
Status: offline 		Thanks for the inputs. I'm running the engine on the 5.6 lb Extreme Flight 58" Extra with a Hyde soft mount. The tank is positioned against the wing tube and the clunk is free.
Steve

(in reply to petec)
       Post #: 5

RE: YS-63 FZ Loss of Power on Uplines - 7/15/2008 8:16:06 PM   
petec



Posts: 658
Joined: 1/26/2002
From: Beaver Falls, PA, USA
Status: offline 		OK. Lets look at couple other areas that might cause this.

Does it exhibit this problem right after take off or after the engine has gotten good and hot? How many gallons are though the engine? If it does this after it gets hot and it is a high time engine you could be needing bearings.

Has it ingested anything like grass that might be moving and blocking the intake tract (don't laugh I pulled my hair on a 1.20FZ of mine that would die on downlines until I pulled the throttle apart and found a blade of grass in there)

Have you looked for any junk in the regulator?

Check one at a time so you can say for certain whether that was the culprit if you find an issue.

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RE: YS-63 FZ Loss of Power on Uplines - 7/17/2008 1:52:58 AM   
insalacosm



Posts: 90
Joined: 4/14/2005
From: Arlington, VA, USA
Status: offline 		petec - I have about one gallon through the engine and it consistently loses power on the uplines, even when it is hot. I'm going to take a look a the regulator tonight and will try some of the suggestions when I fly tomorrow.
thanks,
Steve

(in reply to petec)
       Post #: 7

RE: YS-63 FZ Loss of Power on Uplines - 7/18/2008 4:23:39 PM   
insalacosm



Posts: 90
Joined: 4/14/2005
From: Arlington, VA, USA
Status: offline 		good news, I got out flying yesterday and had much better performance when I leaned the high end and richened the regulator. I also replaced the glow plug just to rule that out as a problem. I'm not sure which of the adjustments fixed the problem, but my top RPM is now set to 10.5k (backed off from 10.7k) and the power doesn't bleed off on the uplines. Thanks for the help!
Steve

(in reply to insalacosm)
       Post #: 8

RE: YS-63 FZ Loss of Power on Uplines - 8/4/2008 9:34:50 PM   
insalacosm



Posts: 90
Joined: 4/14/2005
From: Arlington, VA, USA
Status: offline 		As I noted in the last post I am now getting better performance with a slightly leaner setting, but I am noticing one strange thing - whenever I roll to inverted (so the engine is upright), I notice a ton of exhaust coming out. The exhaust is hardly noticable during normal flight but it billows out clouds of smoke when rolling or changing pitch as if it is running really rich. Any ideas why an engine may richen up when rolling to inverted or changing pitch?

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RE: YS-63 FZ Loss of Power on Uplines - 8/4/2008 10:05:26 PM   
mjfrederick


 

Posts: 593
Joined: 8/18/2006
From: Baton Rouge, LA, USA
Status: offline 		Is your fuel tank secure? It sounds like with attitude changes you're getting a difference in fuel flow, which to me would indicate a kink in the line that is momentarily opening when the attitude changes.

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RE: YS-63 FZ Loss of Power on Uplines - 8/5/2008 4:48:58 PM   
insalacosm



Posts: 90
Joined: 4/14/2005
From: Arlington, VA, USA
Status: offline 		The tank and lines are secure. I'm wondering if fuel may be pooling somewhere and dumping into the carb when the attitude changes...
Steve

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       Post #: 11

RE: YS-63 FZ Loss of Power on Uplines - 8/5/2008 6:00:03 PM   
petec



Posts: 658
Joined: 1/26/2002
From: Beaver Falls, PA, USA
Status: offline 		There is really no where for the fuel to pool that comes to mind, unless it is pooling in the valve cover which would be very strange indeed.

The beauty of the YS system is it meters fuel very well. I have to agree with Mr. Frederick in that should double check the lines and the clunk line to see if there is any way kink is opening during attitude changes. If this were a normally aspirated engine what you descibe would point to the fuel tank position relative to the carburator.

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Pattern Junkie..Revver Brother #82..Gear Head

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