Gents i just received my u can yesterday and of course it going to get a larger than 91 engine. I have gotten lost in u can do 3 d reading to many smaller engines talk to sort thru. so with that being said post a pic or tell us all about your larger than satio 100 experience. no talk of:
that large of an engine will not be needed
wing loading
balancing issues for those doing the less than 120 sized deal

i will start on my installing this week pics to follow. at this point i am not sure which of my many lying around motors that i will used.

A "Buddy" -that's his name- flew his with 1.80 saito that I DID SEE FLY....and may I say it was a joy to watch. Flew great and didn 't look that bad or out of place. Very Slow flight as well. Didn't act like it was heavy. Plenty of power of course....but left the cowl off. The airplane HANDLED this engine.

my first impression when I saw this plane in person was......"That's going to need something a lot bigger than a saito 100 for wild 3d"
I think you're on the right track ....I wouldn't have even considered the possibility of the saito 100 in it.

I've got a saito 150 on mine, and it does fly a tiny bit "heavier" than when I had an 80 four stroke on it. I did have to move my battery all the way to the back of the fuse, and do have a small amount of lead back there (about 1 oz total), that will be replaced with a larger battery pack (figure if I need the weight, might as well go for more mah). Had I not used a pair of 225's for my elevator halves, it wouldnt have been necessary. I do have tail wires on mine (fully boxed tail), and have strengthened the landing gear block some. I also have sealed my hingelines on both sides on every control surface.

I may be able to move my cg back a little more by putting a perry pump on, and putting the tank over the CG. I'm getting 12-18 minutes on a tank (stock UCD tank), because I am hardly ever at full throttle. It will do very flat spins, climbing spins, and when i can get the sticks right, a perfectly flat knifeedge spin (meaning the fuse is parallel to the ground, rotating around the wing, without losing any altitude). Can even get it to climb like that on a good day (not the planes fault, its mine LOL). It is capable of doing pinwheels (hover to knifeedge microloop back to hover), but I've only been able to do it a few times (again, my fault, not the plane's) I'm running 15% red max fuel, stock muffler, and an apc 17/6 prop. I'll prob drop down to a 16/6 prop to see if it gives me a little faster spool up.

You have to figure given the massive amount of wing area, the weight of the engine isnt going to make a whole lot of difference. It still floats in on landing. Deadsticks are no problem (floats like a trainer, or better). Only downside is the massive amount of right thrust required to turn such a large prop. makes for a hard time aligning the spinner/cowl/fuse seams. Hence the reason I went to a dubro prop nut. No messy gap in the spinner

With the exception of the two other engines I put on mine (enya 80 four stroke, and an OS 91fx), I havent seen one within the recommended power range. There is one at our field that flies with a 91 surpass on it, but I've yet to see it fly to compare it to. The others I've seen had either an OS 120 surpass, or a saito 120 on it. Hope this helps.

Steve

SPECIFICATIONS
Recommended Engines:
1.20-1.50 cu. in. 2-Stroke
1.20-1.50 cu. in. 4-stroke
Wingspan: 73 in.
Wing Area: 962.5 sq. in.
Weight: 10 1/2 -11 lbs.
Length: 65 1/2 in.
Radio Required: 4-Channel w/6 Servos

theses specs came off my 1st real ship back in the day a Sig Cap 231 and that baby flew great with less wing area than the u can. so i knew i wanted and love power. thanks for the replies so far.

the u can deal:
SPECS: Wingspan: 65" (1651mm)
Wing Area: 1024 sq in (66.1 sq dm)
Weight: 7.75 lb (3.5 kg)
Wing Loading: 16-17 oz/sq ft (49-52 g/sq dm)
Length: 68" (1725mm)

Unlimited.

Climbing inverted flat spins, say no more.

I think its unlimited with just about anything over a 91 four stroke. I had the 150 on hand already, and took it out of a 2m pattern plane to get the engine running right. I figured I'd do all my tinkering on the engine with it mounted to a plane that floated, that I was familiar with the flight envelope of. I've been having so much fun with it, I dont wanna take the engine off and put it back on the 11 lb plane. LOLOL

I think the saito 100,120 or the ys 110 are ideal for this plane. the 150 isnt much heavier than the 120. If I didnt have it already, I would have a 100 or 120 on it.

Any YS120 engine (YS120NC first, then YS120SC for me), Rx battery in tail with additional 7oz, tank on CG, throttle servo and Rx behind tank.
DKjens

Just for the heck of it.

Saito 120 no pump,fuel tank in stock location 18x6 zinger prop.

Standard servos in all the stock locations, cs 65 in rudder.

6 vdc battery in the tail

I was able to get tbe muffler to exit out the little center shute of the fuse so there are no holes in the cowling except the big ones in front and underneath.


Greg Predmore

A Saito 120 with an 18x6 zinger? That is what prop I'm using on a 140L....

swings it quite easily. The manual says it's OK.

Greg Predmore

i am going to run the wheel pants on this baby and i like the way pants dress up a girl or is that a skirt i like

these wheel that came with the kit are super light so there getting used....

one of the former is blocking me from putting the tank on the CG so a little mod. is in order

now to reglue some wood here some strenght and support

front view

time to use the aftermarket ca hinge:

aileron time

stab to elevator time:

I am going CA crazy glueing

I took my ucan out two weekends ago with a os61fx on it. It was not what I wanted, and would not do what I needed.

This past week end I uped the powerplant to a YS140sport!
1900ma 6 cell in the tail put the cg @ 4 7/8" Took her out to fly and I was VERY happy! hovers 1/3 stick still floats on landings.

The plane wieghs 9 lbs even. Only got one tank thru it. 3/4 of the way into the flight I was playing with hovering about three mistakes high and another guy mid aired me! I thought it was over, but I got real lucky it took off the left aileron and tail wheel and striped the gears in the aileron servo. I was the man to the guy"s watching. Bringing her in all banged up. After about an hour I thought what the heck I need to get the rest of the fuel out of the tank anyway. So I fired it back up and took to the air. I could not even tell that the left aileron was gone! I flew till she quit and dead sticked in. The only thing that I want to change right now is, I really want a vibration dampening mount and I need right thrust! Any body played with tha right trust? Mark

I have have been reading all about the u can do and it sounds like the plane is like a Harley bike. You buy it and you modify it to make it special or perform better than stock. I was given a u can do after the maiden flight where the plane went into spins and into a fence. Look at ST Thomas plane crashes and you will see how bad it was. I decided that I will fix it, which came with some advantages. I have a OS 108 which is heavy so I rebuilt the nose of the plane shorter to compensate the weight and will keep the stock tank next to the fire wall. I also beefed up the nose to the mid section or near the cg after reading about how week they are there. Just finishing up the plane and will take photos and see how it flies. Has anyone had luck with the OS 108 fsr on there u can do ?
Thanks Herbert

I have an OS 120 Surpass IIIP sitting around. I might as well pull the Saito 100 and put the OS 120 in. With the Saito 100, it could not do waterfall well enough, even with flaperon coupled. Inverted flat spin can climb, but I cannot keep it flat while climbing, thus ended up tumbling. I got to do some knife edge spin one day, but couldn't do it another day.

Frankly, the OS 120 is only like 300 rpm stronger than the Saito 100. I don't think the OS 120 will do that much better, especially it's like 10 oz heavier.

Maybe Saito 180 or YS 140 is a good match.

Anyway, KrazyC, let us know how it flies with the 120. Maybe I will go for the swap.

after looking in my sort of motors this one is looking very appealing

even the cowl will hide the rcs 1.4 just a trial fit as the muffler will change the deal i may need to go tune pipe i will compare the weights of both and see which might work out better...