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Home✈️Aircraft🚁HelicopterAlignT-REX 600N › 4-Stroke 600N
05-17-2016 02:00 PM  4 years ago
Four Stroker

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Atlanta

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Tried to get it broken in Sunday. Hard to do. Took 2 tanks to just find the rough needle settings. New weird carb runs at about 7/8 turn open. Old carb was 1 & 3/4. Started at 2 open. But 5-th tank was getting there. Did run smooth. Needs more breaking in and some minor tuning still.

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06-09-2016 02:10 AM  4 years ago
Four Stroker

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Atlanta

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I am done with this one. Engine is dialed in and works fine. Long stroke engine lowered the head speed of this already LHS heli about 100. Put the short pipe on it. Has 7.47 gear ratio. Would be better closer to 7. I am mostly using the extra displacement to run richer.

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06-15-2016 04:01 PM  4 years ago
Four Stroker

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Atlanta

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Interesting Update

I have confirmation from the factory that the YS FZ80 S achieves the HP peak at around 15,000 rpm. Leaving a little margin and using a governor, the gear ratio should be selected for what you are trying to do. For my old school flying and antique blades, I am happy with 1800. So govern to maybe 14K and use a gear ratio of 14,000 / 1800 = 7.8 : 1. Or even 8:1. In old school flying you select top end pitch to maintain the 1800 in FFF. 3D always bog or blow out the ESC on sustained full throttle and pitch.

Of course you still have the 1) cooling 2) clutch 3) auto one-way problem areas. If I were starting from scratch, I would start with a lightweight 700 with gasser clutch / gearing and chop it to maybe 620 blades.
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06-15-2016 05:16 PM  4 years ago
fla heli boy

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cape coral, florida

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this post means nothing without video to hear that sweet 4 stroke sound....
My all time favorite engine was my YS120 on my Goldberg Extra years ago. I could start it with two fingers on the spinner. Flip my fingers to hit the compression on the backstroke, fired first time every time. I really miss that thing...
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06-15-2016 09:51 PM  4 years ago
Four Stroker

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Atlanta

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Yeah. I am with you but can't get any of the guys I fly with to do the video. I am working on it. I guess I could hire some kid to make me a video.
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Home✈️Aircraft🚁HelicopterAlignT-REX 600N › 4-Stroke 600N
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