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HelicopterScale Model RC Helicopters › TT50 in my MD530 fuse gets really HOT
08-06-2007 10:06 AM  10 years agoPost 1
Prince Caramba

rrNovice

Luxembourg

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My tt50 engine gets really hot after few minutes of flight of my scale md 530 with Raptor 50 mechanics. Ive tried a lot of things, it is running very rich now (throttle stick must be a lot above the middle to take off). The motor had 2 gallons of fuel (10% nitro). Side windows are off to make better airflow. Im really out of ideas. Im afraid do run it too rich, have flameout and crash my heli. Tips anyone?

I love the smell of helipad in the morning...

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08-06-2007 04:28 PM  10 years agoPost 2
Copter Doctor

rrProfessor

Enterprise/ft.rucker​,al- home of army​aviation

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the first thing i would do is run higher nitro. though it should run with 10%, i would try 15%. this way yu go up in nitro without spending what it would cost to go to 30% although that would make it run even cooler. nitro acts as a cooling agent as well as provide more power. also make sure the engine is running in its peak rpm range. if it is turning too slow, it will run hot so maybe a head speed of 1700rpm or so should keep it happy. most people will run lengthy pieces of exhaust deflectors to exit the fuse in the scale position, this causes a backpressure buildup in some cses that will cause overheating so run a short as posible tubing if you have to. a tip for this if it has to be long is to run a tubing that doesnt get smaller in diameter than the exhaust's opening. i run big diameter tubings with a smaller diameter used at the muffler sude to take up the difference in the diameters of the big tubing and that of the nmuffler tip. hope this helps.

drive a rotary, fly a rotorcraft

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08-06-2007 04:35 PM  10 years agoPost 3
RobRoy

rrKey Veteran

Huntsville, Alabama

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Not sure what you are considering hot, but when I was running TT50's I noticed they all ran quit a bit hotter than my OS's did. I believe this is just a TT thing, and not a real problem, as I put 20 plus gallons through one of my TT50's and never had a problem.

Ignorance is curable, stupidity is for life.

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08-06-2007 05:11 PM  10 years agoPost 4
BarracudaHockey

rrMaster

Jacksonville FL

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Mine runs at 165 to 170 with 30 percent and plenty of power to spare.

Andy
AMA 77227
http://www.jaxrc.com

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08-07-2007 04:02 PM  10 years agoPost 5
Prince Caramba

rrNovice

Luxembourg

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Thanks for advice. Muffler tubbing is indeed quite long (20cm). Its so hot, that i cant hold my finger on the backplate longer than 1sec. Should i adjust pitch curve for scale model? Mine is set for standard rappy and i have to go a lot over the middle throttle to make it hover.

I love the smell of helipad in the morning...

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08-07-2007 04:34 PM  10 years agoPost 6
Copter Doctor

rrProfessor

Enterprise/ft.rucker​,al- home of army​aviation

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yeah that tubing being long will do it most times. as far as the pitch, here's what you do. go ahead and hover it. you say it hovers above half stick? well while in the hover, if you can have the screen for your pitch curve displayed while hovering and you can note where the stick is, and if you are comfortable enough to quickly glance at the screen to see where the output value is, then you want to program that value at the half stick position. do the same with the throttle curve.

drive a rotary, fly a rotorcraft

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