xray328

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So heres my latest, an Enya powered .15 midget SNS. (I know I need stickers.) I built this to be a "parkflyer", but this little Enya packs a punch so we'll see about that. It came with a 7x4 but I've heard it might take a 9x6?!? I can't get it tuned though. I'm just not good enough yet to properly route the pushrod and get the throttle adjusted correctly, this Enya is so small. It all works fine I guess but I can't shut it off via the radio. Thats kind of a problem since its gonna belly land. Any tips?

MrGreenSpeed

What kind or radio TX do You have.
I have a flash 5x it has epa( endpoint adjustment that changes how far the servo arm moves from the center) from 0 to 125% hold stick down and adjust idle/shut off.. go full throttle adjust so it's wide open at full throttle. Then add in aprox 10 to 25 % idle trim and use the cut off switch to stop the engine.
That way if You panic You won't dead stick by pulling the throttle off.
My old 5 channel futaba also has trim pots that can be adjusted with a small screw driver.

If not; You have to keep playing with the throttle wire/push rod and servo horn hole placement till You get it right.( can be a pain in the butt.)
Jeff
ps
a 9 x 6 is too big for a .15 an 8 x 3 or 8 x 4 work good, but break it in on a 7 x 4 first.

smokingwreckage

With analog radios I set the trim at idle with the radio trim about 3/4 of the way up. That way to kill the engine simply reduce the throttle and slide the trim all the way down.

Scott Crownover

I like to make separate pushrods for the throttle lever end, and for the servo arm end, making sure that they are long enough to overlap by about 1 1/2 inches. Then I slip a 2 inch long piece of fuel tubing over the overlap to make a single easily adjusted pushrod (this can be either before or after you hook up the servo end). It makes a tight slip fit, plenty strong enough to hold a length adjustment, and very forgiving in a crash.

Scott

smokingwreckage

Wow. Great idea! Now I can use up all those old pushrod ends that have been stacking up on the shelf.

mikenlapaz

Scott Crownover :
I like your strain relief/adjustment method. I'm going to give it a try on a OS52FS new on test stand going into a new design SPAD.

xray328

My Feedback: (1)

Thanks for the info guys!

coolbean

I've seen that method used on a lot of combat planes, especially the ones with breakaway engine mounts. It works good for the smaller engines, but anything over above a .40 with the bigger carbs, servos, and vibration it gets a little iffy. At that point I have seen guys slip wheel collars on instead of, or with the fuel tubing for a little more reisitance.