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I'm not pleased with the structural integrity of this muffler though. I found the TT 3D pipe to give good power with lower engine temperature. The muffler is a very important component that determines the tuning and power output. « Last Edit: April 20, 2010, 04:19:47 PM by anwar »įirst of all, let me specify the configuration I use. You have to adjust the tuning to your local situation, and then use either curves or the governor to limit the peak rpm. Each engine (even from the same brand) reacts differently, based on fuel blend, ambient temperature etc. On the Trex 600N with CF blades, I run 2000 for idle for idle2. Once I know that the target rpm is achieved, I usually leave it there instead of trying to extract the best performance. What I typically do is to use the backplate temperature method (or use a temp-gun on the head if the backplate is not accessible) to tune the HSN, in idle-up mode. So as soon as you can hit that rpm, you do not need to lean the engine any further (of course, better leaning, if available, will help with fuel consumption, but running a little rich helps with durability of the engine). Governor/Tach : A lot of times, your headspeed is driven by the governor, OR you know your target headspeed. Temperature : On most engines, touching the backplate gives you a good indication of which way the HSN needs to be adjusted.ģ. Sound : For two stroke engines, it is easy (with a bit of experience) to know when the engine is too lean based on sound of the engine alone.Ģ.
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So what we are typically tuning for is around the 65% to 80% opening of the throttle.ġ.
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The way we tune heli engines is vastly different from how we tune airplane engines (at least what I typically do, or have seen others do it all the time on our field, and so was what I learned from seeing Joe do it).įor airplanes, we sort of push the throttle stick to max position, and tune by watching the engine screaming sound (easy for 2 strokes, not so for 4 strokes).įor helis, like you mentioned, we cannot be tuning the needle while the throttle is at the max, unless one does something crazy like what you are proposing The other big difference is that we almost never really use full throttle (WOT). at 100% throttle and +10 deg pitch, what kind of rpm would I be getting ? Woodies have a limit of 1700 RPM max.ģ. I know its dangerous, but then with adequate help and precautions, would it be an OK way of setting up the needle precisely ?Ģ-Can i attempt to do this with Wooden blades ? or should i wait for CF ones. I know that when LSN is rich the transition is sluggish, so perhaps start from a very rich point and gradually keep on closing the needle till we get it right.ġ- Does this way of setting up the needle sound stupid ? ( the HSN part ). Just get it at the richest setting where the transition from idle to max is smooth and linear.
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and pinching the fuel line increases the RPM and doesnt cause the engine to fie. What I am planning to do, is tie the heli (very very very) securely on a car roof, and then under the normal mode (Pitch: -5 - 0 - 10, Throttle: 0-50-100), gradually get the engine to full speed.Īt this point carefully (with a helmet on ) tune the needle, so we get the needle at a point where it is slightly richer than the MAX RPM. I am finding it tough, since I cannot really get to operate the engine at full throttle and still hover. I have a TT 53 Redline installed in my Raptor 50 and now i have had around a gallon of fuel through it.Time to tune the engine !Īs with airplane engines, I think the first step is to get the high speed needle (HSN) set correctly.