RCU Forums - U Can Do 3D

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I got my UCD 60 engine changed over from a os 90 fx two stroke engine to a saito 100 engine. What a dfference! It hovers much better, could'nt do this with my 90 engine. I'm presently flying with a apc 15*6 prop and taching at 8750 rpm. Is this ok for this engine?

I'm planning to change the prop from 15*6 to a 16*4 APC wide blade, is this a right move?
Its flying good, but not sure if the CG is right, whats the right CG for 3D flying?

Regards,
Adarsh

Just starting to work on a UCD 60. Trying to beef up the landing gear block. It is narrow up in there, any suggestions?

jship

I pinned mine with bamboo scewers, added a couple pieces of triangle stock, and no troubles. Tight little area to get in.

I fly the 46 do from a very rough field.
I use 1/4-20 nylon screws and 1/4-20 T nuts so the gear breaks away instead of ripping out the gear block.
I also use the Dubro plastic gear for my floats and field flying.
Works for me, I have seen too many guys rip out the gear block.

Ihave a .46 UCD and have tried an OS55AX, 91FX, and currently an OS75AX. The 55 seems a bit underpowered for 3d, but does well flying sport. It flew better with the 91 but Iswapped it out to rebuild. The 75 seems to have enough power to fly some light 3d but lacks the ability to pull out of a hover with the power Iwant.

I think it would perform better with a 4 stroke swinging a bigger prop, but this being my first 3d type glo fueled aircraft, Iam going to stick with a 2Stroke. Iactually prefer electric but decided to try my hand with glo for a little bit. Imay have to try and do an electric conversion, that or go with a EP3D plane from the start.

Atill a great flying plane. BTW, how is everyone ripping their landing gear off. Ifly off a paved runway, maybe that has something to do with it huh. Ialso fly my UCD .46 in 10-20mph winds normally and it's a blast hehehe.

Aloha,
Les

i have a U Can do 60 with a new Monster 60 Electric Motor (400kv). Im using a 6s and a 17x8 Prop.
Flies really nice with the electric setup. Now im thinking of getting the smaller U can do 46 so i can convert that one as well.

http://www.youtube.com/watch?v=GZzUCqTUvOE

I have a U-Can-Do 60 with a Satio 125 and 17x4 prop. Seems to do well. Can go straight up forever. I crashed it once, cracked the fuse in half, fixed it by reglueing and added part of a manalla folder to the broken area for support, covered it back with colored contact paper. (if it looks kind of crappy, I won't be so nervious when I fly) I also made a battery compartment behind the wing in the fuse to move the CG back. This seemed to much, so I added a heaver tail wheel. This made it tollerable. However, several times I have taken off with my Du-bro glow battery still attached to the engine! Every time, I was so pleased with how it flew, so smooth and precise....I may have moved the cg too far back!
One thing I do to all my planes is seal all control surfaces. I try to stay out of the throttle but have never had a problem with flutter. A friend of mine flew his 40 size U-Can apart due to flutter...they are built MUCH lighter than the 60s, he did not have his control surfaces sealed, it might have saved his aircraft.

I have a Edge 540 60 under the tree but HobbyTown messed up the order and I dont have a motor[:@] I was ordering a Saito 125A. Is this the way to go or should I use a different motor? I am sticking with glow and 4stroke...

Come on, I know there's someone out there who's stuck a DLE20 on this thing.

Has anyone tried side force generators ?

Side force generators for a U-Can-Do? Nope, not on my list.

I want to talk to the guy that says he can do a CLIMBING inverted flat spin with a U-Can-Do.

:)Fred,
I'm sure I'm not the only one...but I do inverted climbing flat spins with mine. Also the 40 size.
I have a YS110. The extra power makes it possible I think as I couldn't do them with the Saito 100 I had on them originally.
Thanks
Barry

would be interesting if someone did put a DLE20 in this. I would like to know how it would fly also considering its about 820g with 2.5hp and saito 115 is 586g with 2.1hp

BARRY

Thanks for the information. I will continue to try.

U-Can-Do .46 on floats.

Excellent performance.

BARRY
I wrote previously, but with the two pictures included, I couldn't get it past my browser.
I have an O.S. .91 4 cycle pumper and an APC 14-6 prop. I have tried the C.G. in several places. I have weighed the tail down so in an inverted flat spin the nose was pointed up at about a 20 degree angle and still wouldn't climb. I agree that I need more power for a climbing spin.

If anyone reading this is interested in float flying with a .46, I used Goldberg "Super Floats" which adds 2 pounds to the flying weight which is why I used the .91 engine, and the C.G. is at 6 inches. The struts are Dubro plastic gear which is flexible and much better than rigid aluminum for flying where there is turbulance from waves and wake from jet skiis and boats. With the pontoons, the plane spins as flat as a saucer. Comes out of the spin immediately with neutral rudder. High rate on the ailerons is 45 degrees and 60 degrees on the elevator and rudder.

There is nothing prettier than a smooth landing on calm water.

Beautiful to watch. Exciting to execute.

So Fred, you're saying the 91 pumped OS didn't have enough pull to climb up in the flat spin move? I ask because I was going to run one in mine when I get my plane together; somebody in the club recently sold me a YS 91 with an air chamber but that engine was going into something else. Looks like I'll have to reconsider.

Hello Roary m

All I can really say is that "I" couldn't do a climbing inverted flat spin with my setup.

Regards, FRED

:)Guys,
It appears you are discussing the 46 size UCD. I was earlier talking about the 90 size.
My 46 UCD was fitted with a Saito 82 and a APC 14x4 prop. I had the CG set right at 6" back from leading edge. I'm not certain, without looking at my notes, but I think mine was about 6.5lbs weight. This plane would do the inverted rising flat spin fine. Not quite as good as the 90 size but very close.
The other thing to consider is control throws. I'm guessing I was very close to 60* up and down elevator. (I know I keep braking the elevators when the hinges are because I max out the throws) Also all I could get on the rudder. (massive throws) The ailreons are not quite so critical as you tend to flatten them out as you do the maneuver. The large down elevator (up when you're upside down) and full right rudder are the key. This gets the nose slightly elevated and then you just keep her spinning and modulating the ailerons to keep her from flipping out of the maneuver and it eventually will start to rise. Also I start at an idle and modulate the throttle to sorta snap the nose up and begin the rise. On the 46 I'd say I'd be able to get about 20 feet up before I'd do something wrong and flip out.
Love the UCDs. I've since moved on to Giant Scale and no longer can do rising flat spins. My 50CC Sbach was the closest. I could get it to stop but no rise. My other planes just won't really do it at all.
The UCDs have limitations but I love them. I've have 3 of the 90 size and 4 of the 46 size and 1 of the Giant size. I loved all of them. I've sold, crashed or given away all but one 90 size. I only fly it in the spring now to get everything loosend up after the long winter lay off before I go to the giant size birds. But I still enjoy it. They are one of the most "FUN" planes I've ever flown. What a riot. It was simpler then also. I kinda wish I'd never have moved on.

The UCD probably takes more "flack" than any other plane here on RCU about how it really isn't a 3D plane, it's flimsey, it's ugly etc etc etc. But I love them and it hovers in a class by itself. It' waterfalls wonderfully, it flat spins with the VERY best of them and I got used to the looks. I just love them. The only real fault I can find is in kinfe edge. It couples to the wheels a LOT. But if KE coupling is your bag...it does that as well as any plane out there.
And landing is as easy as dropping a feather. I just love the UCDs. And the rising invertied flat spins are just plane COOOOOOOOOL!
Thanks
Barry

BARRY

Yes, I was talking about the U-Can-Do .46. Thank you for the informative and detailed message.

Regards, FRED

After flying a Hanger 9 Showtime I think a UCD needs side force generators.

Hi, Control

I don't expect to try them, but if you do, give us all a report. I can do a nice KE now, but my priority, if you have been following these notes, is to do the elusive (for me) climbing inverted flat spin.

Regards, FRED

Fred, were you talking about the 46 size U Can Do with a 91 four stroke?

Hello, Roary m

Yes, I have an O.S. .91 4 cycle with a pump in my U-Can-Do .46, and an APC 14-6 prop. I float fly and my floats weigh two pounds and I need the power. We fly at a lake that is busy and many times the plane hits a wake and is airborne before it reaches normal takeoff speed. Then we have to hit full throttle quickly.
I haven't been able to do the climbing inverted spin even without floats on the plane. My plane is heavier than Barry's. Besides a heavier engine, I also use a heavier gear, the Dubro plastic gear that they peddle. When it gets warmer, I will lighten things up for field flying. I like floats better than skis for snow.

Regards, FRED

ATTENTION

TOWER HOBBIES HAS THE U-CAN-DO 46 ON SALE FOR $134.97 AND SHIPPING IS FREE UNTIL JAN 31.

I WAS SURPRISED AT THE PRICE AND NOW I AM CONCERNED THAT THEY WILL STOP SELLING THE PLANE. All good things...

Regards, FRED