1st U Can Do
 

Up until a few days ago, my favorite plane was my Sig Somethin' Extra. I happened across a .60 size U can do, and I like it. I like it alot. The first thing I did was slap an OS 1.20 on the nose and let 'er rip. It didn't fly too bad, and it had alot of the same characteristics as the Funtana and Katana ... Hard to slow down to go into a maneuver like a harrier or hover, although it didn't have the rock that a funtana has in a harrier. Anyways, I decided to go outside my box and try a smaller 2 stroke. This is my first 2 stroke on a 3d ship, so I didn't know what to expect. Now the manual says it will hover with a 61FX , but not to use anything bigger than a .91 2 or 4 stroke. I mounted a ST G75 with a 13X4W prop. It will fly around fine, and if the wind is just right, it will hover for a few seconds, but there's just not enough umph to pull out of it. I noticed that the suggested props for this engine are 12X6 and 13X6. Would I gain anything by going to a 14X4W or maybe just a 14X4? Or would it be too hard on this cheap little chineese thing (the engine)? I'm running Omega 5% and it seems to run better on that than the 15%. The whole plane weighs in at 7 pounds 4.75 ounces. That's about a pound heavier than my .40 size mustang, and my FL .70 flies it around with authority. I was just wondering if I could get any more out of this G75, or if what I have is all I'm going to get.

RE: 1st U Can Do
 

you will never be satisfied with that engine, just get one of the two most recomended engines for the 60 size Do which is a ys110 or a saito 125, then you will get what you want ou of this plane.;)

RE: 1st U Can Do
 

That 13x4W is not a good size for the G75. That's more for a .46.

Consider running say a 14x6 or 15x6.

You should have NO problems with the G75 on a .60 plane. It should do almost as well as a FS 1.20. once properly propped.

RE: 1st U Can Do
 

I would suggest a saito 125. It will be "awesome" with this engine. I use Saito 125/16X4w prop & 25% fuel.

Bruce

RE: 1st U Can Do
 

That ST75 is a heavy pig, you dont want a boat anchor hanging off the front of a plane you're trying to 3D with,also you will never get it to swing a 15x6 and expect 3D performance. That thing lugs hard with a 14x6 (ask me how I know, lol) . I have an OS 1.08 on mine, and the power is just about perfect. Why you took the 1.20 4 stroke off I don't know, but it was a much better engine for that plane than that ST75.

RE: 1st U Can Do
 

I'm flying my UCD 60 with a ST 90. With a MCP, it's swinging an APC 15x4w at 11,300. This setup has plenty of vertical pullout from a hover.

For awhile I had a TT Pro 120 in the nose. It had awesome power, but the extra weight killed the overall 3D performance. So I went back to the ST 90 w/MCP and the UCD60 is much more fun to fly again.

A 15x6 is way too big for 3D with a ST 75. Even a 14x6 is pushing it. Either the 14x4w or 13x4w will probably work the best on that ST 75.

RE: 1st U Can Do
 

I have a ucando with a saito 100 and a 16x4 prop. I think this is the perfect motor for this plane.

http://image.rcuniverse.com/gallery/...9/lg-96007.jpg

RE: 1st U Can Do
 

:)The Saito 100 is the perfect engine for the UCD....unless you consider the Saito 125 or the mighty 110. They are clearly better. I loved my UCD with the 100 until I went to the mighty 110...then I LOVED my UCD.

Thanks
Barry

RE: 1st U Can Do
 

I have an OS .91 fx 2st in my UCD...hovers on about half throttle...turning a master 15 x 6. I really love this combo and the UCD I believe is a genuine RC bargain!!, I have flown mine so much that pretty much all the covering is coming off...maybe time for another...

The ST75 is not enough pull for the UCD, i have a ST90 on a pipe in another aircraft and it feels about 80% of the OS 91, so the 75 is not going to be enough.

Bear in mind these ST's are not high revving motors, you need to use the torque, hence bigger props, my ST .90 on a pipe turns a 15 x 7 APC.

Cheers

Wavy

RE: 1st U Can Do
 

I would agree, the 125 is awesome ( I have one in my funtana x100). I would still consider the 100 however since its about 5 ounces lighter and about 60 bucks cheaper then the 125:D

RE: 1st U Can Do
 

Broke:

Ssorry, there is no substitute for a good engine on any 3D machine. The 60UCD is a good flyer, if you can not get it to hover with relative ease, your engine is poop, and your CG is off buy a bunch. The YS 110 with 16 X 4 apc is a great combo, flys much better than the 40 size UCD. A Sato 100 or so may be ok, but not the performance with the YS. Sorry, you gotta stick a good engine on the front of this thing in order to enjoy its performance. I am sure there is several 2 stokers that will fly this airframe well, I'm just not familiar with them. There is lots of info on the UCD on rcu, find the thread and read until you find something in the 2 stoke that will work well. I like the ST 75, its just not a 3D engine, much to heavy for the output in this application. Keep practicing, getting your first torque rolls are the hard part, then it becomes much easier. I am stuck on rolling circles, but gettilng there with the foamy and will get it sooner or later. If it was easy everyone could do the stuff, and not evryone will be able to do this stuff. You gotta work, work, work and never give up. It is worth the effort, and for me its a lot of effort being very long in the tooth. Go, go go, and ENJOY

RE: 1st U Can Do
 

I was just trying to keep the weight down. Sure ... I'd love to have the power of my 1.20 in an engine that weighs less than a .60 2 stroke ... but the plain reality of it is that it just ain't gonna happen. Now, you can say what you want about the bigger engines being sooooooooooooooooo much better, but you have to realize that the bigger the engine the more vibration you're going to have. This all started out to be an experiment with the U Can Do. I lightened the frame and empenage as much as I could and still leave it structuraly sound. I could have left the 1.20 on it, then added another pound of epoxy and fiberglass strengthening all the weak points to keep it from vibrating apart, but in the end, all I've done is make a 7 pound bird weigh 10 pounds (added engine and support weight). I wasn't sure what to expect putting a lighter 2 stroke on it, but it harriers easier and the loops are tighter.
I'm not one of those people that can afford to go out and buy a new engine every time I get a new plane. I AM one of those people that are forced to use what I have. That's most of the reason I only fly here at my house. Every time I would go to the field, at least 1 rich spoiled person would tell me ... " You need to put a blah blah blah engine on that thing ... and a set of $500 retracts ... oh, and a $150 spinner would look soooooo cool ... and don't forget about the $50 prop ...". Hey Genius ... you just made a 13 pound airplane weigh 20 pounds with all your cool stuff ... and you have to be going BTW and WOT just to make a turn.
I think I'll try the 14X4W on my boat anchor. It didn't really seem like the 13X4W was much of a challenge for the engine.

RE: 1st U Can Do
 

Dang!! All this talk of the 60 U Can Do and I may just have to break down and get one. I just ordered my forth 46 Do too. I still have the 3rd but got it as a back up. Oh well. '
Hey good luck with your 60 Broke and I'm sure you'll have fun with it.

RE: 1st U Can Do
 

I hear you with the financial concerns,but the fact remains, flying 3-D is all about the engine AND plane, you must have both capable of the task. A heavy engine with poor transition will not make it any easier,it will make it frustrating at best. The only ST I had was the G91 and it had very poor transition, (bad carburation IMO), I had to rotate the spray-bar towards the back of the venturi to get rid of mid-range loading. Then a Cline unit & to get it so-so. After trying quite a few "cheaper" engines(Moki 1.35,Webre 1.20,ST90,K&B ect)I found that the extra $$ is worth it for the best. If money is tight, wouldnt foamies be a way to go?

RE: 1st U Can Do
 

If your 1.20 runs so bad that you had to reinforce the plane that much, then you need to send the motor in for repairs, or buy isolation mounts. The Saito 1.20 doesn't vibrate that bad. Also, if you were out to keep your plane light, then you sure as heck chose the wrong 2 stroke. You'd been much better off buying a SK90. They're very inexpensive, and torque monsters and light. You got awful huffy when you started reading the responses to your question, you should've expected that coming from most of us that over power our UCI's hard core, then again, we fly the plane as it was designed. :)

RE: 1st U Can Do
 

While I enjoy all of my UCD's I find that the UCD 46 is better at 3D.

RE: 1st U Can Do
 

Damn, I thought I was bad, they're multiplying! I've had a Moki 1.35 in a Do & it was fine. I did add a few tri-stocks to firewall but nothing much. If its vibrating with a 1.20, somethings wrong somewhere? Prop,mount,spinner?????

RE: 1st U Can Do
 

How will the UCD 60 run with the tower .75? If it won't run good is there another reliable engine that dosen't cost 200$ like the O.S. .90

RE: 1st U Can Do
 

:)You can get the new mighty 110 for $399. That would be my choice.

Thanks
Barry

RE: 1st U Can Do
 

If you must chose an inexpensive motor (the 1.20 ax is your best 2 stroke option in my opinion) then look at the SK 90 engines by Kangkeusa. They swing a big prop at low rpms, perfect for 3D. The TH 75 will fly it, but you will be limited.

RE: 1st U Can Do
 

I often chuckle at people that say they don't have enough pull out in a hover. How much do you need? If your in a nice controlled hover, minimal pull out is required. Does it make a difference weather it rockets out of a hover as oppossed to a smooth pull? I would suggest breaking out the foamies and practicing until one is better at it.;)

RE: 1st U Can Do
 

Hey, if you find a good running cheap alternative to OS,YS,Saito, let us all know. I mean good power & transition too, & it will last. I was thinking of the Evolution 1.00 myself if $$$ was tight. I've seen a few of the 40 size & they were very powerful.

RE: 1st U Can Do
 

Yup, I forgot about that one, I seen an Evo 1.00 run in a .60 Twist and it was pretty dang powerful.

RE: 1st U Can Do
 

I borrowed an Evolution 100 from a buddy and tested it in a profile Katana 70. For sport flying, it's probably fine. But for 3D the stock carb has a dead spot at half throttle that goes too lean.

A ST 90 carb made the Evo 100 run pretty good, but lost a few hundred RPM off the top end. But for 3D, the Evo 100 ran great with the ST 90 carb.

Here's some RPM comparison data:

APC 15x4w:
Evo 100 (stock carb) = 11,100
Evo 100 (ST 90 carb) = 10,700
OS 91FX = 11,200
ST 90 w/MCP = 11,300

Zinger Pro 15x6:
Evo 100 (stock carb) = 10,200
Evo 100 (ST 90 carb) = 10,000
OS 91FX = 9,800
ST 90 w/MCP = 10,400

RE: 1st U Can Do
 

If you have to play around with different carbs, then you might as well buy the best & skip all that experimentation. The end result will probably be about the same $$$. I've been there & done that.