N2 flight time - HeliFreak
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Old 05-25-2012, 03:45 AM   #1 (permalink)
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Default N2 flight time

N2 owners with OS55/Align 55 engines: what flight times do you get, and at what head speed?

I'm flying at 2100 RPM. After 7 minutes, the tank is almost completely empty. This is only a minute more than my electric birds. I don't have much experience with nitro engines, but I was expecting a little longer flights.

The N2 fuel tank is fairly big for a 50 size, isn't it?
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Old 05-25-2012, 05:53 AM   #2 (permalink)
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I fly 8:30 min on both my N1 and N2 with O.S 55's with about a quarter of a tank left ... idle up 1 2000rpm, idle up 2 2050 rpm. I'm get just about the same flight time as my 50's in my Trex 600's. This is Very mild 3D/sport flying!

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Old 05-25-2012, 06:09 AM   #3 (permalink)
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Wow. I'm wondering if I'm running too rich. On the other hand, the engine is fairly hot (220-ish F) after flight. I'm not flying particularly hard either. Mild 3D/sports.
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Old 05-25-2012, 06:36 AM   #4 (permalink)
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When Idling, does the pipe load up a lot? If you hold the heli with the nose straight up and you have a lot of fuel pouring out of you pipe ... Or does it spit a lot of fuel on idle? If it does then Lean out the Idle screw (1/8th of a turn clockwise at a time) ... the one the manual says not to touch

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BTW ... I am no way a nitro engine tuning expert ... just a little tip a pro pilot help me out with!
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Old 05-25-2012, 07:46 AM   #5 (permalink)
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I'll check next time I fly.. but does the idle screw affect the flight in mid- and high range?
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Old 05-26-2012, 07:06 AM   #6 (permalink)
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Yeah it will a bit ...I'd start with your mid and high needle at 1.5 turns out from closed and set the idle needle so that it's not puking fuel from the exhaust ... then lean her a bit from there. 1.5 turns is PRETTY close to being tuned ... for my two 55's anyway

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Old 05-27-2012, 09:42 PM   #7 (permalink)
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My 55HZ-R with the HR55 pipe gets 10 easy pushing it, 12 easy sport with 3/4 inch of fuel left. The tank is swelled out like a baloon from the pressure, holds more now I think, lmao.
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Old 05-27-2012, 11:33 PM   #8 (permalink)
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I'm running a YS56 with outrage evo 56 pipe. When tuned in 80 degree F weather I set my timer for 8:30 and land with a 1/4" of fuel left. In 90 degree weather I can push 10 minutes with a possible forced auto near the end. The pressure definitely swells the tank and I take advantage. This is flying hard but even in cooler temperatures I can get at least 8 minutes. The velocity gets the best flight times of any nitro I've owed thus far.
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Old 05-28-2012, 09:16 AM   #9 (permalink)
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not to thread jack but my ys50 pukes fuel out the pipe like literally i can see fuel spots on the boom after a flight and if you hover right in front of you you can see it dripping out of the pipe. the ys50st is only a two needle carb though so would that be a low end adjustment?
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Old 05-28-2012, 10:13 AM   #10 (permalink)
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That's high.
For low if it's to rich after idleing a while it will sputter and smoke excessivly trying to throttle as well as take some time to run out after pinching off the line.
High to rich of coarse lots of smoke, raspy sounding, excessive dripping from the pipe.
Lean, just the oposit and wont want to idle down after a hard run from being to hot.
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