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05-06-2006, 09:15 AM
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#1 |
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Father of the Scale Furum
 
Join Date: Jan 2006
Location: Chapel Hill, TN
Age: 34
Posts: 4,577
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what happened? what changed??
30% Extra and DA 50... New motor with 1.5 gallons. Tuned it and runs super. Flown everyday this week after work. One day great. Next day after storms came through,much cooler and dryer air... It was super rich and 4 cycling bad. On a nice cool dry dense air day... One should need to richen. What happened? Needles did not move in flight.
__________________
"I'll have the roast duck with the mango salsa" Kit builders check out.... http://bobflies.com/ 2.4 GHz is for your home telephone... 14MZ and 72 MHz for huckin' baby!! |
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05-06-2006, 11:05 AM
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#2 |
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I'm Watching You!
  
Join Date: Jan 2006
Location: Connecticut, USA
Age: 31
Posts: 10,144
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Re: what happened? what changed??
Fuel Change? Maybe some not-so-desirable fuel in the last tank... got it tuned on that fuel and it was fine until you got some good fresh stuff. I have also noticed at they break in slightly, the mixture changes slightly/needs to be adjusted. Those are the only two things I can think of.
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"Hey at Joe Nall I personally saw Tank kick a kitten in the face!" --66Stang J'Tec Radiowave 3D HobbyShop Aircraft International |
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05-06-2006, 11:13 AM
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#3 |
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Father of the Scale Furum
Join Date: Jan 2006
Location: Chapel Hill, TN
Age: 34
Posts: 4,577
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Re: what happened? what changed??
Same very fresh 2 gallons of fuel....
__________________
"I'll have the roast duck with the mango salsa" Kit builders check out.... http://bobflies.com/ 2.4 GHz is for your home telephone... 14MZ and 72 MHz for huckin' baby!! |
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05-06-2006, 11:18 PM
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#4 |
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Bad-ass Super Contributer!
Join Date: Jan 2006
Location: Chile
Age: 58
Posts: 5,856
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Re: what happened? what changed??
Gremlin.
Maybe a smidgen of junk is under the needle. Changes in air density etc dont normally have a huge impact on the engine. Its not like you tuned it at sea level and tried to fly it at 10,000 ft. Kiwi |
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05-07-2006, 12:12 AM
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#5 |
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Bad-ass Super Contributer!
Join Date: Jan 2006
Location: Memphis, TN
Age: 25
Posts: 860
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Re: what happened? what changed??
I'm going with Kiwi and saying it's some junk in the carb. Any time one of these engines does something unexpected, the carb is a good place to begin troubleshooting. You also might want to try a new spark plug if it still does it.
On another note, my 150 doesn't always play by the rules in regards to air temperature/density. I know that colder air normally is more dense, therefore the engine should run slightly leaner for a given mixture setting. However, my 150 seems to be more affected by the cooler air cooling the cylinders more than warmer air would. I'm talking about an 80 degree day, VS a 55-60 degree day. Once the engine warms up, it's back to normal. Does your 50 do this once it's warm? |
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05-07-2006, 09:17 AM
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#6 |
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Father of the Scale Furum
Join Date: Jan 2006
Location: Chapel Hill, TN
Age: 34
Posts: 4,577
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Re: what happened? what changed??
Started and flew yet the 3rd day in a row... Just fine. It just suddenly needed leaned. Strange. Its all set now and has been.
__________________
"I'll have the roast duck with the mango salsa" Kit builders check out.... http://bobflies.com/ 2.4 GHz is for your home telephone... 14MZ and 72 MHz for huckin' baby!! |
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