The reversing Y won't give you the precision you need.

I've explained this probably 10 times here on RCU--seems noone is listening.

For the 11th time:

A servo will NEVER travel the same amount in BOTH directions.

For instance:
When you pull up elevator--lets say the servo travels clockwise 55* (degrees)
When you push down elevator--it's NOT gonna move 55* counter-clockwise--it's gonna travel 50* or maybe 45*---but NOT 55*

This is true of ALL servos from EVERY manufacturer. From the cheapest Blue Bird--too the highest quality biggest turbo 2000 digital from JR.

NO servo will travel the same amount in BOTH directions. PERIOD.

So:
You slap a reversing Y on one of your elevator servos and then center them up with the pot.
Looks good right?

Take a look at your elevatos when you pull up elevator.
HMMMMMMM--thats funny. The left side goes up 1" and the right side only goes up 3/4"
Whats up with that?

Thats because the left side servo is traveling 55* (for arguments sake) and the right side is only going 45*

NOW--push DOWN elevator:
HMMMMMMMMMM--same thing--ONLY REVERSED!!!!!!!!!!!!!
The left side goes down 3/4" (45*) and the right side goes down 1" (55*)

The servos are reversed--and they are NOT traveling the same amount.

One is going 55* (left elevator) clockwise and the other is going only 45* (right elevator) clockwise. Then you push the stick the other direction----and BOOM--the the left one now travels 45* counter-clockwise and the right one travels 55* counter-clockwise

You get differential throws in the elevators. Eveytime you pull back--the plane corkcrews to the left. And everytime you push down--the plane corkscrews to the right. Thats why you can't pull back and do a nice round loop without it spiraling away from you or snapping out on the top of the loop. It's not that your plane is doing a high speed snap. It's because your elevators aren't adjusted to track with each other throughout the full range of travel.

If you think I'm full of sh*t then try this:

Put a nice long servo arm on a servo. ANY servo.

Now hook it up to an receiver and push the stick in one direction. Note the amount of travel in that direction.

Now push the stick the other way. WHOOOOAAAAA!!!!!!!!!!!!--it don't move the same amount does it?????????????

Thats because the servo will NEVER travel the same amount in both directions unless you set the ENDPOINTS with the TX or a Matchbox.

So when you reverse a servo and center it with the pot--you are indeed reversing the servo.

BUT--and here's the kicker---YOU HAVE NO WAY TO ADJUST THE ENDPOINTS.

You need to be able to adjust the endpoints of BOTH servos INDEPENDANTLY if you want the elevators to move together and be synchronized throughout the full range of travel.

You can't do that with a reversing Y. You can only adjust the center point.

Reversing Y's don't work if you really want any kind of precision. If you don't care about precision--and your flying a Cub--then, most certainly, buy the reversing Y and be happy. Or maybe your not even a good enough pilot to notice that a plane can spiral towards you or away from you in a loop. Maybe you can't figure out why everytime you pull back and point the plane straight up that you also have to add in some aileron to correct it because it started to corkscrew when you hogged back on the elevator.

If thats the kind of pilot you are--then by all means--save yourself $30 and buy a reversing Y. You'll never know the difference.

If you WANT precision and you want to fly aerobatics--then buy a Matchbox or an Equalizer. If you want your plane to track straight when your pulling a loop--------or if your even a good enough pilot to notice that a plane will spiral away from you in a loop with poorly set up elevators---the you should get the Matchbox.