hey guys i just got a excellron 90 and wonder if there r any tips or tricks i should know about im using a ys 120 in and what kind of pipe should i use. any info would be great thanks

Congratulations, they are getting harder and harder to find.

Regarding the YS 1.20 installation:
I have a YS 1.20 in mine. No real need for a pipe, and it would be hard to locate it in the belly pan. I use the standard muffler and vertical performance with a 14 X 10 is unlimited. I used the included stock soft mount, locktited all screws and nuts on it, and so far have had no problems with it. Some have had theirs break, and have opted for the very similar but more robust MK soft mount assembly.

Regarding tank location:
The stock tank fits with just a little modification inside the middle fuse former that happens to be right over the CG. With typical throttle management found in turnaround pattern flying, this 12 odd oz. tank is good for 20 minutes. I used a Velcro wrap to hold it in, and my 1700Mah battery is velcroed under the back one half of the tank, right in front of the elevator, rudder, and throttle servos. Had to add one and a half oz. of lead to the tail to get the CG suited to my tastes... without the lead knife edge seemed to require a bit more rudder than I wanted. The tail weight made the model neutral, at least for me.

Radio Installation:
Once again, the design is good enough so that I went with the stock pull-pull, running it through the little tubes which are pre-installed in the fuse. At first I didn't think this was going to be a good idea, but many flights later, the pull-pull is just fine. Some flyers like to cut the counter balances from the elevator halves. There is a thread in the forum which discusses this.... hope this helps.

GPB

thanks for the info cant wait to get it flying

that YS 120 should hall that baby around like no tomorrow.

I have one finished and one in a box, it is interesting to note that several builders found the need to add weight or relocate the battery to get the correct CG. I find it interesting that the above poster only needed a 1/2 oz in the rear. I wound up putting my 5 cell Ni-Mh battery just in front of the horizontal stab. That's shifting 5.2 oz's to the rear to get a 7.5" CG setting. Is the YS 120 that light? Can't imagine that.

I did not move the tank to the CG line.

Keep us posted o your experience with this.

I'm temporarily set back with family medical issues, but will be in the air soon.

Mike R

Hope the family member gets better soon Mike.

Having the tank over the CG changes the way the airframe will balance. In flight, a tank located on the CG will eliminate initial nose heaviness and a gradually aft shifting CG as the fuel load lightens. Keeps the airplane neutral from take off to landing CG-wise.

I completely understand locating the tank over the CG, that really wasn't the point I was trying to make, Just pointing out how many people have had to relocate equipment to get the proper CG.

Mike

Wayne,

Do a search in this forum for Excelleron and you will find everything you need to know. There were some pretty extensive threads two years ago on that plane.

Pete