Neverquit347... Guess you know there is a huge UCD 46 thread that
has all your questions answered

The Mag 91 will not fit with the stock engine mount.. At least that's what's been
told to me.... I'm now switching my YS63 to the Mag 91... I ordered this mount.

http://www2.towerhobbies.com/cgi-bin...&I=LXJ773&P=ML

The Mag will turn the 15X4.. My mag 91 4c turned it good.. But I had vibration
problems while hovering which kept breaking my exshaust pipe... So I now use
a APC 14X4W and it works great for me (4*60)... and the engine I'm now putting
in my UCD 46... I believe I use a 2&1/4 tru-turn wide blade spinner which fits like
a glove..

I heard about some flooding problems with the Mag, And yet some said they
had no problems?? I'm lowering my tank by about 3/4" and I'm going to try
to raise the fuel tubing from tank to carb.. (Like a upside down U) and see
how that goes....

Your servos will work with long arms to get full throws... 15% fuel works great in Mags..

On the tail wires.. Some report stab failures, So a few install tail wires.. I have
wires on mine and would use them again if I order another..

The landing gear block is a weak point... You should add some tri-stock to the area
and epoxy in.. Or at the very least add more epoxy... Not so good landings will rip
the gear out... The control surfaces are big... keep all tight, and get good mech.
advantages on your connections to prevent flutter...

The UCD flys and land really easy.. Shes a good floater.. turn the rates up and she
will do a lot!! But she will not take much abuse.... And she is not a speed plane...
She is a plane I enjoy flying...