Here we go, I got my UCD, I just started the build, I'm on step 1 and already have a question[&:]
I did download the manual before hand to get all the necessary equipment or tools. But this 3/32" bit has been hard to find. None at the LHS. Do I really need to drill a 1/2" hole in order to install the hinges?
How far or close should the ailerons be to the wing? I read somewhere that the space between should let a paper go trough.

Sorry but I would consider this to be my first buid, the actual first one was a mini super sportster but I don't count that one.

Thanks in advance for all the help..and the patiance!!!
Is it me or does this UCD 46 looks more like a 60 size???

hhmm... the engine appears to be mounted correctly and when I put the cowl on it lines up properly; it just looks like the v-stack is rubbing the side of the mount. I'll take some pictures tonight if I can as that might help visualize the issue.

Any thoughts on the throttle linkage position?

Thanks,

Mark

Hey Barry, did you see my Funtana X100 post-8.2 lbs!!!!!!!(no pants,spinner,or SFG) Have you ever heard of CG back to 7.5" on either F90 or X100?

Barry
Have you compared the YS 110 & Saito 125? I'm going to put a ShowTime together and can't decide on engine for it.

Doug

[quote]ORIGINAL: Barry Cazier


That is what works for me. It spins beautifully. I usually start out inverted. Do you start from the inverted position Barry?

Dougwill, they are trying to convince me to put a Saito 180 on the Showtime. From what I have seen and heard the 150 flies it great and the 180 only weighs one ounce more. Although I dont have $400 right now.

Hi Barry - have followed you on many threads - your advice on the YS 110 was great. I finally joined the "Do" club and am just finishing it up. There's a Saito 82 on the front but I'm not sure what prop. What have you used on yours?

Ted

dougwill...

I have compared the Saito 125 to the YS 110. For my elevation I got more power with the YS. It just seemed to have a bit more snap. I liked the Saito though and thought it was a great engine. I since sold it to a friend. At lower elevations I think they would have the same power.

My UCD CG is at 5 5/8". Works very good for me there. Will do anything I want and it still flys/lands super easy. I love it.

rclement...

I start upright, but I'm so high when I start I'm really not sure.


rtn9105...

Another thing I thought about with the flat spin problem...Are you using the stock pushrods? They are too light. I use carbon fiber, some use 4-40. Whatever...but the stock rods are too light and won't hold the rudder good enough.

sctcrash...

The 180 would be awesome. It would handle it fine.

Thanks
barry

Hey Blisster.. Not sure if you got your engine/mount fit resloved... depending how far
back the engine is sometimes the carb will hit one of the mount bolts.. I have shaved
some of the head of that bolt in the pass to get all to fit... On "Do" # 2, I did it different,
I used the stock mount and installed up right, and put the S82 inverted on the top of the
mount.. Doing this I raised the carb. a little over 1/2" plus I had more room for the stack
filter...
I did have to trim one of the mount arms to get the carb to fit... All else fit great
even the stack and I believe the filter will work with no problem... You can see pics on
pages 176/4399, 179/4453 & 4463, 191/4755 and 194/4835...

ForeverHero... You can see a little of my throttle setup.....

Barry, I'm using the Abell carbon fiber push rods and ends and DuBro 60-90 size HD control horns on all control surfaces. I'm running a 6 volt RX battery, Hitec metal gear 625's on the ailerons and 645's on the elevators and rudder.

rtn9105...

Man...sounds like you've got all the right stuff. I'm at a loss as to why it won't flat spin.

Thanks
Barry

TedG...

Welcome to this thread. There are an awful lot of good guys on here. Just trying to enjoy the hobby without a lot of hassel. Great fun.

I think you'll love the UCD as much as any plane out there. I fly at 4800' elevation. I use 30% Cool Power fuel. I use an APC 14x4W on my 82. Flys it very well. I think if you use 30% and you are at or near sealevel you could try a 15x4W. If not then you'll want to stay with the 14". It's a great combo. One of my very favorites.

Thanks
BArry

Hey guys !! Great to see the the massive Do thread just keeps getting bigger. I always tell friends to come in here and look through this thread for Q&A on the DooDoo when they get one. I'm still flying number 3 and it keeps getting better all the time. These UCDs will do stuff no other will. Amen.

So here's my question for the Do experts tonight. I've been running a Saito.72 with 14x4W APC . A local hobby shop owner suggested running the 14x5N APC instead. He claims it will tax the engine less and I'll still get the pullout power I had with the 14x4w.
I have swapped the prop and ran the engine. It does seem to spool up better and get less warm. But will this prop hurt OR help my CanDo flying ?

Thanks in Advance !!

Hey Sturtz and Welcome.... Never looked at the "n" prop... I take it the "n" stands for
narrow?? It looks that way on the web site, but hard to tell... Besides welcoming you
I was hoping that you would tell us(me) the size difference from the 14x4W...
Not much help on what it will do[]... But if you have it on and it spools up faster,
you have the true to life tester... Let us know how it goes... Have you ever tried a
13x4W?? seems like your 72 may like that better than the 14x4w, maybe even the
12.25x3.75... I ran that in my YS 63 during the "Hot" season here... It would over
rev if you let it, but hardly ever at full throttle on the "Do"...But WoW on the response!!
It worked great for me....

rtn9105.... You have a lot of good stuff on that "Do".... As Barry said, it should do it find...
IMO... Tho pretty much the same, each model will be a bit different... You may just have
to work on setup to get it where you like it.. I have full throw(45%) while doing the inverted
F.S., some days I just hold the sticks all the way over, and other days I may have to adjust
a small bit...

sturtz...

THe narrow prop sounds interesting. I've never seen one. I would guess the thrust would be down a bit over the wide prop. But the extra RPM would maybe over come it. I'm interested in your thoughts. If you fly it let us know.

Thanks
barry

raideron...

What's your temp down there these days? I'll bet that hot weather sucks the HP out of an engine.

Thansk
Barry

rtn, I am just catching up on this thread. Tell me what your planes does when you try to flat spin[sm=50_50.gif] Does it end up with the nose pointing down some or what? How does it react to inverted flat spin inputs?

When I give full elevator input the fuse will get to about a 45deg angle and do a nice spin but it won't flatten out any more than that. It does the same thing inverted as up right. On my first UCD I could get the plane to this same point, then start to slowly cross the aileron input and it would flatten right out and do a nice tight flat spin but this one won't flatten out no matter what input I give.

That is exactly what I expected you to say and it sounds like one of 3 things.
1. Not enough power
2. Not enough elevator throw
3. CG is not far enough back.


It takes power to do a flat spin as well as having the right throws setup. If you dont have the power to pickup the nose, regardless fo how much elevator throw you have it will not flatten out.

Since you are stuck with whatever engine is on it, and power may not be the problem, increase your elevator throw 5 degrees at a time and test it. Once you get the spin setup and you are centering the ailerons increase power until it flattens out. That might be as much as 3/4 to full throttle. If it flips over when you increase throttle, just dont add as much throttle on the next try. If you get to 45-50 degrees of down elevator throw and it still will not flatten out, you might double check you cg and if you have room move it back a little at a time. On a UCD you should not need to go back more than about 5.5"+/-

You guys first gave me a warm welcome on 5/16/2005 . Page 91 I believe. But regardless,,, thanks again for being here and being helpful.
The 13x4w prop has always been my bad weather prop. Too humid,, too windy,, too hot,, too cold. My .72 likes the 14x4w on basically perfect engine condition days. (Back to the narrow prop.) According to the store owner who is a young guy and flys 3/D , heli's , jets, etc. The guys that fly Do.46s,, running 4-stroke type .72/.82 , size engines have all been flying this narrow prop. And I'm told they prefer it over the Wide prop. Ok,,, I'll bite. Will post a report back here when I get back from flying today.
I'll try both props ,, the 14x4w and the 14x5n and write my comments down with each flight. But I can't see a narrow blade out hovering the wide.

I'm back from the field. Tach battery low so no rpm report. But I can say that after a bit of tweaking on the needles for the new prop it was worth the trip.
Roll out was a tiny bit longer it seemed (maybe two feet more) and my speed might have been a touch higher in general. I know I used the throttle down switch on my 9Super for landings. But they were still harrier stops like always.
Hovering was easier than before at half throttle and sustaining the hover was just a blip more of throttle instead of full. So I guess the answer is YES. Try this prop out on your Saito/UCD 46 combo. The best part was how cool the engine was after landing. You could have stuck your tongue on the valve covers.

[link=http://www2.towerhobbies.com/cgi-bin/wti0001p?&I=LXFGW2&P=7]14x5N APC[/link]

Sturtz
Interesting that your 72 handles the 14 X 4w. I tried one on my 46 sized cub and I couldn't get it to turn more than 8700 rpms and it wanted to overheat. I ended up using a 13 X 6 and it flew great. (Scale not 3D) Plane was over 7#s though. I also found that the 14 X 4 wood prop tuned higher rpms that the APC 14 x 4w. Alot heavier, APC is still the best prop for Saito 82 for the UCD.

Thaks Barry for the info on 125 Saito. Maybe I'll hold off and go a little bigger on ST.
Doug

Hey Barry............. HOT... HOt.... and Hot,,,, Yep that about sums it up...
But last week it was getting down to 78's in the AM... Real nice!! But the last
few days and this morning at the field it was in the 90's and a bit humid...= HOT
I had the S.T.,, but only shot the Sh_t... and did not fly..... Another 2-3 weeks
and it should be great... But the field will be FULL also,,, right now we'd be
lucky to get 3-4 guys flying on the main days.. M-W and the weekends... It's
kinda nice.. since I can fly any which way... But I have been getting out of
the low stuff, besides on the inverted flyby since it seems to work your wallet
a lot more.... and my wallet's pretty light.......

rtn9105... With the S 100 you have loads of power... I think you just have to work
on it a bit.... And make sure the plane is fully stalled and flying off the prop and full
throw surfaces.... It'll come around.... Just keep plugging away....

Sturtz.... Man your 72 must be a power house to turn the 14X4W good.... That's what
I run on the 82... Yeah... let us know the difference you see between the two...
AAhh.. Jus read your report... That's great... I love the wide blades tho... But I may
give that prop a try....

Doug,,, that was my concern all along. Does the 72 really handle the 14x4w or am I just slowly destroying the engine? Guess the answer lies in how many times the motors been back to Horizon for service. At least twice.
It did get hot running the wide prop and sometimes during hot or cold days I'd have to switch to the 13x4w .
Still I think the 14 size prop pulls the Do around best. And this narrow prop looks like a keeper and might save me another set of bearings.