YS .50 Setup Question

[SoftwareDrone]

Hello. :-)

My question is, where is mid throttle on a YS .50? There are three lines around midpoint on the engine, but if I set up a ball link on the throttle arm, then another one on the throttle servo, carefully set up the linkage so that I get 100% throw on both full throttle and no throttle, and make sure that both ends are orthogonal on what the transmitter (9303) says is 50% throttle stick (totally linear curve), then the position of the actual throttle is way past the third line at half stick. What gives? Am I to trust the radio and forget about the three tick marks on the engine, or am I missing something?
Thanks!
:-)
Mike

[WayneBrown]

YS has the three marks, the center is supposed to indicate hover throttle position (40%) which is not quite linear.
I find the headspeed dictates the mark more so than the actual position, and for my taste the two marks closest to idle is where I want it.
For the sake of arguement, set the idle limit, the Wide open throttle limit, and as long as your mid-stick (radio) ends between the three marks you will be within adjustment.
I tend to adjust my throttle position at midstick with sub-trim over throttle curves on the YS's. To me it makes it where I don't have to screw with all three curves for different flight mode positions, Your mileage may vary.. ;)

[SoftwareDrone]

Thank you for your reply. I am still a bit confused, however. Forgetting about the servo or the transmitter for a moment, the mechanical midpoint of the range of throttle on the physical carbuerator is nowhere near any of the three lines. It is well past the third line. So, if the throttle on the engine is at this (mechanically centered) point when I do have the servo hooked up and the transmitter shows 50% throttle stick, and the linkage rod is orthogonal to the arms on both ends, is my linkage correct?

[SoftwareDrone]

Actually, Finless Bob was able to answer this question. The short answer is yes. If you get 100/100, no binding, linear curve, then by definition, the throttle is going to be at the mechanical center when the transmitter stick is at center (assuming equal axis/ball distances and orthogonality at 50%). Then setup the GV-1 to take care of the headspeed, and throttle will take care of itself.

[WayneBrown]

Your setup is normal, however the YS design dictates you use a lesser setting for mid-throttle. On the 91's the throttle barrel is actually a blade, the 50 it is a round barrel, however they appear to have kept a similar setup for continuity.
If you can mechanically achieve full throttle and full closed without changing end points, you are golden, just reduce the value at mid-stick via sub-trim to get the barrel mark within the three lines. You will find that the linkage and altered sub-trim will act as expo, idle to mid will be gradual, mid to full throttle will be quick.

[WayneBrown]

Finless's advice will work, however what are you going to do in the event of a governor malfunction?
I prefer to have curves that work underlying the governor setup in all modes, so when the inevitable magnet spitting or sensor failure occurs I don't overspeed and blow the engine up.
Not saying Finless is wrong, but there are alternate methods that will protect your gear in the event crap happens.
Another thing that comes to mind, how do you expect to tune the engine properly? Historically the governor will mask a too lean condition by compensating with more throttle. I tune with governor off, in a stunt mode, when I've determined the tune is okay, I switch the governor on and have at it.

[SoftwareDrone]

Your setup is normal, however the YS design dictates you use a lesser setting for mid-throttle. On the 91's the throttle barrel is actually a blade, the 50 it is a round barrel, however they appear to have kept a similar setup for continuity.
If you can mechanically achieve full throttle and full closed without changing end points, you are golden, just reduce the value at mid-stick via sub-trim to get the barrel mark within the three lines. You will find that the linkage and altered sub-trim will act as expo, idle to mid will be gradual, mid to full throttle will be quick.

This is exactly what I needed. I will do this pronto. Thanks!
:-)