Yeah, they were a pain. I ended up beveling the ply mounts on all sides to clear the wheel. I then put the washers on, slid the wheel on the axle, used the allen wrench in the set screw to hold the wheel collar, pried out the pant a little and positioned it over the axle. Took a lot of patience....

I got one of these UCD 46 for christmas. I have the 60 size with an OS 91 FX and love it. I spent a good three hours today reading through this whole thread today and I still can't decide on what engine to use. My original plan was to rob my Zen 50 of it's OS 50 SX as it has been having a tank problem. From what I've read though the 50 may be a bit anemic in 3d. I also got a new YS 63 fro christmas but was planning to use it on my Burrito that is almost done covering. I don't have a Saito 72 but if I was going to buy an engine for this plane it would either be Saito 72 or another YS 63. I also have a Saito 91 in a GP Super Sportster that I really enjoy flying so I kinda hate to dismantle that one but it would be the best choice I have at the moment.

I'm leaning towards HS-225's all around with a 1450 5 cell rx pack. Lighter servos like these may make it pretty decent with the OS 50 on the TH muffler.
Any other bright ideas?
basmntdweller

i've used the o.s. 70 and the saito .91. you can really feel a big difference with the .91. Whichever engine you use i would consider a bigger tank. With the 8 oz. tank i had problems with too much pressure in the tank and 4-5min run times. i used a 12oz flex tank and it helped with the pressure problem and gave me a few more minutes.

Joe,

The bevel idea seems like a good one. I will try flexing the wheel pant and see what happens or I will send it to GP and tell them their manual is full of #$%# and have them put the darn thing together, here is what I am going to use in the plane. Hitec Eclipse 7 with Spectra module, Hitec 605's all the way around with a 1650 Ma NMH at 6 volts with a voltage regulator, the 605's put out 94oz/.13 sec so they should be fine there, I used the Kayvan remote glow plug and the GP remote filler 4/40 rods with a carbon fiber arrow covering for strength, Sullavan flex 12 oz flex tank....just my luck this thing will probably explode in mid air due to solar flares or something no one else had heard of yet....just a little humor there guys. Thanks to all the help out there this is a great thread, Happy New year everyone.


Mike.

Opps I did it again

and again

DANG!!! please tell me thats not due to the take its self apart in air wing deal. still very very very wing shy.

No, it started down pouring on me and i wanted to get it on the ground quick and i ended up landing in the berms and the thick grass riped the gear and then some off. It's all back together with lots of fiber glass now.
back to field tommorow

ok see now got to quit posting in bed

I had a mishap with mine Tuesday, but it wasn't from flying. I seem to do more damage to my planes just taking the in and out of the truck. I was carrying my UCD back inside at night and rammed the tail into my driver's side mirror. Broke the left elevator in half. But, I got it repaired for todays fun.

Good job on the fix outonalimb! You enjoying that saito? I bet you are. That plane handles with so much authority with that motor.

I came in on a dead stick the other day (ran outta gas) and tapped the ground kinda hard. Took out the nylon bolts again, but with a heated small screwdriver (used a bic lighter) I backed the broken parts of the nylon bolts out and replaced them and was back up in 10 minutes. My UCD really looks like a beater compared to yours. I told myself if I ever tear it up where it won't fly, I'm gonna get another one. Haven't seen the day yet (probably just jinxed myself two times for saying that). Have a good one. If its ever pretty and low wind on a Sunday afternoon, I'll try to get back up there to NLR and fly with ya'll. Tell everyone I said hi.

Ok guys, I got a Rossi .45 which is suppose to have 2.1 hp. With a 12.25 X 3.75 prop, will this be enough to hover the UCD?

Here's the plan:

mount the engine right side up to prevent the fuel from siphoning out (a hole in the top of
the cowl won't be all that bad)

cut a hole to mount the right elevator servo higher so the control horn is down to eliminate using a servo reverser.

mount the 90 oz pull-pull rudder servo on the under side right behind the wing for the CG problem.

fiberglass the landing gear

install tall wires (lines)

use 4-40 rods

Any other suggestions?

Capt_Kc, hopefully i won't have anymore mishaps anytime soon. it wasn't a very clean break but it went back together ok(Luckly i had the cowl off). everyone's asking when your coming back down.(or over) they said you fly a lot like me(don't know if that was a compliment or complant. take care and come back soon.

I have a Webra 50 speed vil it be ok for UCD 46

I don't know about others, but I just haven't seen the problem of fuel siphoning out. My engine is mounted inverted (Saito .91) A have a small loop of fuel tubing from the tank to the fuel nipple. It sort of goes up, the ndown to the carb. No leakage that I've seen, at all. But, if you feel like it, try putting in a fuel filler valve and when not flying, insert the filler probe into the valve. Someone else mentioned this a while ago. It should solve the problem, and your UCD will still look good.

Well, one of our club members had a Tower Hobbies .46 engine mounted inverted & it siphoned rather badly. I dont think it matters whether you're using a 2 or 4 stroke, inverted the carb is going to be below the fuel tank. Besides, I hate trying to put the glow igniter on
underneath when starting the engine.

I noticed a couple of fellas last summer flying the 60 size UCD laid their planes upside down on a cradle to fuel & start them. And both of them left the cowl off because of overheating.
One had a OS .90 2 stroke, the other a YS .90 4 stroke. I will try it with the cowl on but will put ducting inside the cowl to force the air up around the cylinder head.

Grumpy,

There is a remote glow plugs made by Kavan, thats what I going to use fits on the cowl and make things so much easier when starting, check out the review on the UCD thats where I got the idea. Here is the link http://www.hobby-lobby.com/glowplug.htm



Mike.

mine hovered with the rossi 45 and 12.25*3.75 apc,BARELY!! ran it inverted,no siphoning problems. A LITTLE BETTER WITH AN O.S 70FS.Get the saito 100,solve the cg problem and have some power to spare.Better to have it and not need it than need it and not have it!

A Saito 100 is WAY too much power. I have a 72 in mine and it pulls strongly from a hover.

A Saito 100 is not too much power if you know what the throttle stick is to be used for, nor is it too much additional weight. 16 x 4W prop clears the ground just fine.

Inverted enignes seem to be a flooding problem when they are new and just being broken in. After run for a while you can lean the low end a little, then just make sure the carb is closed before you fuel the plane.

Ed M.

You may have too flat a pitch prop. One of my friends had a Tower .46 engine (1.75 hp) & he proped it with an 11x4, claimed it pulled vertically rather well.

I do happen to have a YS 91 sitting around doing nothing. I had it on a Something Extra which made that thing incredibly fast. But I'd really like to use the Rossi .45.

Grrrrrumpy, Now the YS 91 may be too much motor!!! Just kidding. Watch the stock blind nuts in the firewall if you use them. Mine broke off at the flange the first time I went to the 16 x 4W on the 100. I was able to modify the stock mount a little and get the 100 to fit, not sure if the YS91 will or not and I'm not home to be able to measure it. Firewall must be strong, I ain't ripped it out yet. Did blow the horizontal stab off on both sides practicing roller coasters, patched and added 4/40 rods as braces to the bottom side and everything has been fine since.

The good thing about a 4 pitch prop on this plane is it keeps the speed to a reasonable level. I think this plane will self destruct if flown fast, but several folks are proving me wrong.

Ed M.

Hello All,
Well, after breaking in my engine (nowhere near enough) I had to put mine in the air. All I can say is that the guy that did the review for RCUniverse lied. He said that this airplane was fun to fly. That doesn't even come close! It's a friggin' BLAST to fly!!!
Straight up, right off the deck and completely vertical. I only put a Tower .61 on it and it loves it. The fuel siphoning problem will always be there, unless I turn it upside down, but all in all, its great!
I got G2 for Christmas and that helped immensely. I have never had a 3D plane before, so I knew the sim helped when I flew it inverted and was doing snap rolls on the second flight. Third flight, I was doing the closest thing to a hover that I have been able to do, and practiced that the rest of the day. I got a pretty bad sun burn, but it was worth it!
Anyone that wants to buy one, don't let this thread scare you. They float like trainers on approach, land like you knew what you were doing and fly like you've done it before. They build confidence and excitement with every flight. Get one! You will love it!


Red

Hey Guys, I Finaly got the chance to take my UCD .46 out a few times. The first flight was a little hairy, for some reason, I had gotten really bad flutter on the elevator. Luckily, I cut the throttle intime to catch it before the back end ripped off and I managed to get it down. When I looked at it, the entire Horiz. Stab was flopping around, and the fues was cracked pretty bad back there. I reinforced the fuse with some plywood and took her back up. So far, the UCD .46 has been a great flying plane. Im running the .61FX on it with a 12X6 Zinger. Im going to be swithing props to a 13 or 14X4, so we will see how it does. It has unlimited vertical, but I dont like the speed. Im usualy flying it around 1/4 throttle or less. It seems to hover pretty good at about 1/2 throttle.

If you don't like the speed you shouldn't have put in a bigger engine than what it called for.