I use 20% so with 30% you might be better off with the 14x4.I guess the tach will tell.Your hardware sounds great.As far as spinners go check out Tru Turn.They have a new line of small ultimate style with the wide blade cut.A bit more $ but they are really nice spinners.Mine has held up just fine-Like all good 3D planes keep the throttle down unless the nose is up.This little bird just loves to fly slow.I fly 40% most of the time but this plane has me loving the small stuff again.

I'm finishing up my .46 UCD up and have installed 4-40 rods and clevises. But I have left the kit's stock control horns on the elevators and ailerons. Question for those with flying UCD's:

Should I also switch these horns for heavier units, such as Dubro's or ??????


Thanks for responding!

yea you mite want to replace them with something better . i used the mk control towers mk cleaves cental pushrods and hangar 9 ball links .the best setup posable but not really needed .


what the most aft cg any one has tried i havent gone over 6.25 yet

I used central hobbies carbon fibre pushrods, 4-40 dubro ball links, and robart super ball link control horns, dubro HD servo arms. no slop, and it didnt break the bank.

Dylan

Gary, I used the Sullivan arms they work really nice.

this happened right after i put the 4-40 rods on. landed ok, no crash. back out the next morning. how do you like the Arkansas snow?

i had the exact same thing happen, i actually flew a couple of flights with the horz stab completely free to move. flew ok, a little twitchy! i removed the covering and glassed the entire rear area, it will NOT come apart again!

A Quick Question...

I've been thinking about getting a UCD 3D .46 and I'm a bit confused. Many post talk about using the OS FS-70 II and pull out of a hover wih no problems.

I've been thinking of using an OS 46 AX which shows to have more BHP than the 70. however not many are talking about using the 46.

Am I missing something?

John

yes if you look on the spec s on the 46 ax it shows that power at about 17.500 rpm. where the four stroke power was at say 10,500 .you can't get the two stroke power band on a fun fly. it would take a 8 or 9 inch prop to get there not going to happen on a u can do .


two stroke for speed four stroke for going strait up

it needs a four stroke for geting all the best out of it.

satio 100 the right choise i think that is the best engine possable for it. its perfect for it

you can basically take everything you see regarding model engines and horsepower and toss it out. I have a 25cc homelite on a plane, and IIRC, the rated horsepower is about 2.3. but yet it swings a 18x6 prop around quite nicely...

outonalimb,
The same thing happened to mine on the first flight. In fact, it started to flutter. It ended up tearing the fues pretty bad, but luckily I caught it in time to land and fix the problem. I glassed mine back up as well...

Hey guys,

I test ran my engine today (OS 91 Surpass II) I have the idle down ad far as possible and it still wantes to roll forward, I am wondering how you big bloch four strokers are keeping the plane still on the runway? Or are you not? I guess it's not a big deal just dont want to roll into any trouble on anyuone leg, mainly mine. Does a four stroke smooth out the more it breaks in? By the way I am riunning a 14-4W on her, any help would be more appreciated. THX



Mike.

qweedqwag,
Mine was hard to idle down at first(saito.91) but it started slowly coming around. now i can get it down low enough to stand still. it will just take time. right after i got mine just the way i wanted it the bearings went out. sent it back to horizon, got it back and had to start all over. Make sure and store that plane inverted so the oil stays in the crank case. the factory said that my crankcase was bone dry, and i run my engine super rich.
RC Havoc,
i've had this plane since oct. and this is the first problem other than the landing gear. i wasn't at home when it happened and there was not a hobby shop anywhere around. i put block brace all the way around the stab and it held up pretty good. i think i'm going to add some support wires back there too. i've heard the weedeater line works good?

I'm getting close to having my first ucd 46 ready to fly. I've read over the forum and tried to use everything I learned in here to use. I decided to put the fuel tank on the CG but it just want fit. I also wanted a larger tank to feed my new saito .91 so I mounted the tank in the canopy and painted the canopy blue ( I like the way it looks anyway). I'm using a cline regulator setup so tank position should not be a problem. I fiberglassed the gear and added weed trimmer line stab bracing. I added a slight amount of added right thrust to help compensate for the larger engine. Should be a good plane to learn 3d on ( I hope). I can't wait for my missing rudder to come from GP so I can finish and go flying. But my point is thanks to all those who put GOOD information in these forums. They help people like me so much. I would have to learn on my own about things like the landing gear block with such a media to obtain this info.

Hey guy's anybody out there have a saito 72 in there's. if so are you having problems with fuel drawing from the tank??

If so what did you do to correct it.

Thanks

saito .72 in mine, no problem what so ever. it will drip a little fuel if left fueled up, but in flight it is great. you have the pressure line hooked up and nothing is leaking? I also run one of those dubro rotary fuel valve thingys, mounted on the very bottom center of the cowl below the air vent.

Hey guys, I got mine on order. I went out and bought me a Evolution .61 motor for it. The muffler is pretty fat. Should I get a different type of muffler or it will fit? It seems that it wont fit and I'd have to cut a big giant hole on the side. I like the chromey muffler that is on the UCD picture on Towers but not sure if there's any that will fit on this type of motor.

Last question. with this Evolution .61 motor, 10cc, Could I get decent hovering? My LHS said it will pull out good while hovering. So I'm guessing it will hover but I'm not sure how well it pulls out. Hell, is anyone using this size motor on a 2 stroke??

-Tomi

Tomi,
I have a Tower Hobbies .61 in mine and I can't hardly get the thing on the ground! It hates to be restricted by gravity! Mine does more than I expected and with a little play with the prop, I think it will do even more.
Honestly, for all of the things that I have read in this thread, I was scared to death that mine would fall apart in the air, so I took a little extra precaution, but I have had no problems. After I broke the engine in, it just flies and flies and I can land it like it's standing still. I didn't have to add any weight or anything. I put the battery above the fuel tank and the receiver over the CG and it worked out just right. CG is a little bit aft of recommended and it will do, like I said, anything I tell it to.
Good luck with the Evolution. Let me know how it turns out.


Red

I have a Saito .72. It will leak fuel out of the carb so I use a remote fueling valve and when it is parked, I plug the fuel filler into the valve which blocks the line to the carb, so it doesn't leak out. Not a big problem, specially since the Saito is just a SWEET SWEET engine!

Red:
Thanks for the reply. Since this is my first gasser, I wanted to make sure the motor was OK but I'm hoping it'll be what I thought it would be. Bigger displacement, less cost. I was going to get the GMS .61 Ringed motor for $99 at Tower hobbies but their Bill Me Later has a limit. I ordered over $300 and it declined. So I only bought the plane with a few accessories and went out to the LHS and bought me the motor. I just need a starter, ignitor, and fueler.

-Tomi

Glow, not gas... [8D]

is this your first plane ever or just your first glow plane? i wouldn't exactly recommend it as your first plane, it is very unforgiving and has no self righting capability what so ever... not to mention it reacts VERY quickly to control inputs. although, it isn't too much to rekit it...

Im running the OS .61FX on mine. I have plenty of pull out power. Im using a 12X6 Zinger on it right now, but im changing it out to a 13X4 the next time I head out. This plane is great, but to anyone building it, I would suggest reinforcing the fues where the horizontal stab sitts. I almost put it in the first flight because it was too weak and caused the entire stab to flutter.

Did the stab flutter because it was to weak or was it because it had a 2 stroke cranking on a 6 pitch prop creating far more speed than a 3D aircraft is designed for? We know that speed and these aircraft do not go together well. I have to wonder if we fully balanced the controls on these aircraft if flutter would be less of a problem. That is how we keep the the flutter monster away on the full size birds. My guess would be the damage was done by the flutter not the other way around.

The prop pitch was too much for the plane, but I wast flying straight and level full boar. I was actuly falling out of a hammerhead with the motor at idol. When I leveled it out, the weak balsa gave away and the stab began to flutter. I was flying slow at the time, so it wasnt due to speed.

Thanks for the reply's guy's on the saito 72.

What prop are you guy's using on the .72 im thinking a 13-4