Chem, who makes the 15/4? My guy just can't get it together with these sizes. All he seems to know is what he stocks and that is sport props. Joe

Hi Dave,

Lots of guys have been flying their 60 size UCD with the CG at 6" It may be a bit too much depending on pilots experience, so starting from 4 7/8" might be a good idea for novices. I am not claiming to be a pro, but if some guys are flying with the CG at 6", then I should not have any problems, fingers and toes crossed

APC makes the 15X4 W prop, W meaning wide. All of the guys I was chatting with including Meyrick Camilosa who was one of the first guys to put the UCD through it's paces and posting videos of it, was using an APC 15X4 on his Saito 91 and a 16X4 with the Saito 100. You can purchase APC props from APC directly.

Here is the link to APC list of props http://www.apcprop.com/cgi-bin/store...c=6a&product=+

Balance on the UCD 60 can be an interesting game of trail and error....

Mine has the tank on the CG and is balanced at 6" and I like it there personally.

If you have tank mounted on the CG 6" will be slightly pitch unstable but nothing you can't deal with, simply put, where you point the nose is where the plane goes AT ALL TIMES AND AIRSPEEDS. This gets newbies into trouble when they try to flair on final to high and stall the plane, you have to FLY it to the ground. At 6.25 it's even worse and I didn't like it there. Be aware that getting one of these on the ground in the wind can be an exercise in frustration if your back past the 6" mark and have the tank on the CG, the plane will want to nose up and keep flying, gets interesting and a bit nerve wracking at times.

Anything ahead of the 6" mark, or if you have the tank in the nose(even at 6" ) will be far more docile and the plane flies like a big tainer IMO, very easy and predictable.

Shogun....
Just out of curiosity,with your tank on the C of G , where did you set your balance at to start with, i.e ..you worked bak to that 6" yeah....

I started at 5.5 and the plane had all of the "nose heavy" traits, requiredquite abit of down elevator to fly level when inverted etc...

I didn't like it there for aerobatics but it did land like a big trainer, very smooth and stable.

I saw some guys using a YS91AC for a power plant. I just bought one NIB from a friend of mine and will use it i the UCD. Anyone here running that combo? I have to now pul my Sito 91 out.

Scott
Cheer's, ! well comfy for 1st flight @ 4 7/8 then.... fingers crossed for good weather this w/end........Dave

Dave,
At 4 7/8's the plane is so stable that it won't do waterfalls or fly inverted without pushing the stick tothe down ele about half. Not that this is bad mind you, I actually miss how smooth mine flew at 5.5 but the stuff you can do at 6 makes up for it. Mine walls VERY hard at 6 and that alone is worth it simply for the "WOW" factor.

Your going to like yours.

I have to agree, the APC 15x4W is about the best prop you could ever put on this plane! I have the O.S. .91 FX with 15x4W and I'm getting 17,000 RPm's out of it that engine is better than those saito's, my dad said the O.S. 4 -banger engines have more power than saito's.[sm=thumbdown.gif][sm=thumbdown.gif][sm=thumbdown.gif]

Thought today was going to be it. Lately, if its not raining, its windy. I did get a chance to run it up today. All my apprehension about the new set up with the "Cline" regulator was for nothing. Started right up and purred. Didn't have the tach on hand, but the idle is so low and smooth. Transition is quick and responsive. Held it vertically at idle with no rpm change or hiccups. You can almost count the cylinder fireing. The Saito 100 with the 16/4 prop has got some thrust. I may have to get a fish scale and see what it actually gets. Speaking of scales..........It weighed in at 8 lbs strong. I know I got some fat options on it, 5 cell batt. aluminum spinner, 16/4 APC and the regulator with extra fuel lines, tee's, dot's and clamps. Maybe a couple too many coats of paint on the canopy as well, it was scavanged and redone. Just curious to the weight of others out there. Also, balancing the aluminum spinner is very noticible, you could tell right away. Joe

I can't remember the exact weight of my UCD, but I think it was 7.5 lbs if I remember correctly. I have 5 cell NiMH pack, Aluminum spinner, Cline regulator and Saito 100.

I balance my Dave Brown Vortec aluminum spinner by taking a dremil tool to the inside of the cone and the inside of the plate. Careful not to take out too much in any area. Smooth as silk now. I use the top flight magnetic balancer. It works well.

I have a question on the Cline, I have noticed that when I transition from high end to low, the low end seems to have to "catch up", it doesn't get to it's normal idle until it burns off whatever is in the carb, or so it seems. Is this normal? It seems to be creating a short hesitation in the engine.. I am running this on the UCD 60 with a Saito 100..

Also, thge Cline RULES!! I put it on, pressurized the tank, it fired right up! Turned out the high end 3-4 turns and it worked perfect. Made me laugh because another guy at the field with the same set up (no Cline though) did nothing but fiddle with his needle valves all day on his UCD...

I only got to run it up yesterday, but I did notice that after leaning it out and then backing off 3 or 4 clicks it put me right at the normal 1 1/2 turns. We will see if thats where it will fly at. Wondering if the pressurized system affects the low end setting? Joe

I am thinking that the fuel line from the out side of the cline to my carb may be too long. I made it pretty short, but it still may be too long. If you think about it, the longer that line, the more fuel there is after the cline stops pulling for the carb to burn off.. sound right?

That line should not be any longer than 1.5 inches. The shorter the better.

Here is mine, sorry for the blurry one. Maidened today. All I can say about the cline is, SMOOOTH. Unbelievable difference in performance. Regardless of tank position, I can see where all four strokes would benefit from it. Money well spent. Joe

Amen to that Joe. I am having so much fun with mine with no dead sticks I bought a new Saito 100 and a Cline for a back up, I am looking at what is coming down the road In Arfs to install them. THE EXTREME FLIGHT 540 Edge 60 size will be on the market soon. As well as the Sig Mayhem ( NOW) may be a candidate for it. I like to see one preform first. OMP Yak 54 Is what I may go with. I may have to build the Yak only to match the weight of the U-Can -Do. Joe after 2-3 hours engine running time make sure you adjust the valves and give it a good wrench check out to make sure every thing is still OK. As well do it now ( NEW) and I bet you will find a motor mount loose. Or muffler that may need new Nylon tape installed. Just remember if you loose a carb screw or something on the engine - the turn around time to get one may be two to three weeks with Horizon. I may have to try and balance my tru-turn spinners because of you And see if I can get it true thanks . I may be asking you a few questions if I am doing it right? Seems like a plan. SL

Steve, this engine is well seasoned. Its now in UCD #4. With the last three crashes it has been sent out, resulting in bearing changes each time as well as valve setting and gaskets. Very faithfull engine which I never imagined could run any better, untill I installed the regulator. WOW The spinner thing was well worth the effort. Other four stroke owners noticed the difference right off when I ran it up. One thing that was noticably missing was the way the vibrations would "drum" through the wing and airframe. The balance is not complicated. Back plate is balanced first, if not then the cone is a waste of time. Once the backplate is done, assemble the cone and start to remove from the inside of the heavy area. If done correctly the cone and plate can be assembled in any sequence without fear of imbalance. It lengthens the process, but I cannot stress enough to go slow and remove SMALL amounts. If you go to far, than you must start all over or possibly worse, purchase another of these costly items. Good luck and I'll wait to hear of your progress. Joe

Steve, I believe my OMP Yak with the saito 100 came in at around 7.5 awsome plane to fly, and yes it comes in as a kit. If you decide to build it and have questions give me a yell, I can help.

Blackie

Steve,
Is it worth a look at the " Cyclone " .90-1.20FS got one under go now.. brilliant....

www.kmp.ca....Mat's the man to talk to... regards, Dave.

Striker, thanks for the link to the APC props. Joe

Almost forgot, tached it yesterday and with the 16/4 it spun a decent 8700. The high end needle is still at 1 1/2 out. I'll have to fiddle and see if there is a difference. I don't think there is any data available on that engine/prop combo to compare it with.

I can't believe how close that cyclone is to the ucd. I wish someone would start up a forum with some flight reports in it. It looks like an awesome plane. I have only found one forum for it and it was only 7 posts long.

I have this combo and it's great. No need for a Cline regulator as the YS already has a pump on it. I have the tank located on the CG. I just got a MenzS 15-6 prop for it and it's a keeper. Pulls just as good as the APC 16-4 but spools up MUCH faster. I didn't care for the 16-4 at all.

Just remember to go easy on the motor during break-in. YS's motors require a few gallons to breakin.

Best of luck..........Mark

for a glass prop APC 15x4 and 16x4 wood prop Powerpoint, I like this prop there are lite and thin. better throttle responce.