Ok, I will buying the U-Can-Do 46 either tonight or tomorrow (depending on this response). This is what I am getting with the U-Can-Do 46

Magnum XL-91RFS 4-stroke
15x4W Prop
One Hobbico CS-64 High Torque Servo for rudder. I'll be using Futaba S3003 Servos for the rest.


1) I am getting differant opinions on the engine mount. Can I use the stock mount that comes with this plane for the magnum .91? I do not want to do any modification.

2) Is the 15x4 prop the right prop and what size spinner is needed?

3) Is it OK to use the S3003 servos or do I need all high torque servo?

4) Can I use the same fuel I am using for my 2 stroke plane? I am using 15%

5) Do I have to do any modification to the fuel tank.

6) And last, what is the purpose for tail wires, is this necessary.

Thanks, I hope I am not a pain, I just want to get everything right the first time. There is nothing worse then getting something new and then waiting for a part that you need or forgot. I just want to build it and fly. Thanks, John

I'll try a couple--

1. Dunno I do not have this airplane (have seen 'em fly though)
2. Yes, 15x4 is good- I like Pro Zinger wood props. but APC are generally regarded as the best-
3. Yes, 3003's are fine- remember you can use a 6V rx batt. for extra torque if it makes you feel better.
4. Yes-
5. No
6. Tail wires help strengthen the entire tail assembly- Does the UCD-46 come with them?

You are not apain- sometimes the more you read on here the more confusing these decisions become-

Cheers!

the ucd doesn't come with them, but with that much weight up front you probably will have to add them just to balance it out anyway. they are used to prevent the tail from ripping off, which is generally a bad thing!

Had the exact set-up and the inverted engine w/high fuel tank is a nightmare (at least for me).
There will be differing opinions about this but even a regulator was less than good as far as I was concerned, it was a constant pain(for me), when it was right there was power to burn and a blast, the 15x4 zinger is great for this combo.
I have become so soured with the problems with getting consistant runs I pulled the Mag out and tried a Super Tigre G-75 which has been outstanding in every respect. No more flooding, regulators and deadsticks, lots of unlimited verticle.
So no-one misunderstands, I have 4 Mag 4 strokers and they are great......they just don't like UCD's inverted mount and tank???????????

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...

Neverquit, You should have lots of fun with your UCD. They are a blast to fly and the mods aren't all that difficult to do to and well worth the time to keep this plane flying good. I don't know a lot about the Magnum but here's a picture of mine with a Saito 82 and it never floods at all. I think I used the same engine mount that Ron mentioned in the previous post. That Ron's a sharp guy with lots of UCD experience. [8D] Also for the landing gear here's a few pictures of how I modified mine to strengthen the landing gear block. It doesn't take much of a jar to pop them out so I think it's better to modifiy them before hand. The pictures show that I carefully cut out the "ramp" shaped part of the bottom of the fuse. It takes a little bit of work to remove it but once out you can easily add glue or supports to the inside of the fuse, change the T nut configuration for the motor mounts, move the tank, or whatever. I added some Gorilla glue to the landing gear block area of mine and it's bullet proof now. Also I was able to add some more glue to the back of the fire wall and strength it....... Oh, and in the second to last picture you'll notice the tri-stock that is attached to the firewall, if you use that area to screw into to attach the cowl you can omitt the 4 little blocks of wood that the instructions show to add to screw into for the cowl. Hey, it saves a little bit of weight. [8D] I forgot to mention, I haven't put tail wires on mine yet....[X(] but it has held up well. The biggest thing in attaching the tail is to keep in mind not to cut too deep to remove the monokote thereby slicing into the balsa and weaking the tail section. Some have used a solder iron to remove it in that area with great success.

i agree with razor boy that was easy[8D]