I am interested in buying a U CAN DO 3D (what a name), and I have a new YS 91 I can use but am reluctant because of having to buy hi-torque servos.

Anyone running a YS 91 with standard Futaba 3004 servos? Will it work and be safe? Maybe this is a silly question but I had to throw it out there. Let me have it!

Thanks,

WOOD

The 3004 will work on the elevator and ailerons, however I'd buy something more powerful for the rudder. Maybe a Hitec 605 at least. You could get one of those for under $30. I'm using 3001's on the elevators and ailerons and they are working fine. The plane will fly better with high-end servo's, but that would also increase your cost tremendously.

If you already have the YS, then you should do it. It's a great engine for this plane.

I have 3004's all around in my UCD3D... It'll easily climb into a knife edge loop with no wavering of the rudder...

Seems plenty... but (as others have mentioned) if you were to add a stronger servo for the rudder it wouldn't hurt...

Ok, now I'm starting to get interested in this one. I have a few more questions for you guys on this engine install and the airplane in general.

1. Did any YS 91 owners use an inverted pitts muffler, will it fit?

2. Can you use a prop greater than the 6 pitch that is recommended and get away with it, anyone had problems with flutter?

3. Here are the specs on the Futaba 3004 servos from the tower web site. This still makes me wonder if it will be OK to use the standard 3004's, they are close at: 44 oz, they say at least 50+ oz.

SPECS: Speed: 0.23 sec/60 degrees at 4.8V
0.19 sec/60 degrees at 6.0V
Torque: 44.3 ounces-inches (3.2kg-cm) at 4.8V
56.8 ounces-inches (4.1kg-cm) at 6.0V

Specs on 3001's that came with my 9CAP are the same, I thought they were stronger servos...........


4. Any modifications needed other than what is in the instructions?

5. Any complaints on this airplane from anyone?

Thanks,

WOOD

Heres some more information from the tower web site, they want to sell you a t6xas with standard 3004 servos, and two 3003 servos, so they must have tested it with these and work ok.

http://www2.towerhobbies.com/cgi-bin...T=2&I=GPMA1270

To asnwer you question about prop pitch/speed/flutter...

This plane really isn't a speed plane and should be flown as such... Not saying it can't but it is a light plane and you'll feel it in the air... it feels like a funfly not a 1/4 scale CAP 232...

In saying that, it CAN be flown alot like a pattern plane too... clean flying and responsive.

You might also liken it to a 3D trainer... I've started to learn rolling circles with it... It's slow and easy and quickly recovers from a stall or inadvertant exit...

The plane has a channel built in the bottom of the fuse for a tuned pipe... an inverted Pitts might be tight... I had a YS 91 in it and if flew real well with lots of power, but I had some issues with YS engines and replaced it with a Saito 100.. all I can say it AWESOME.... beautiful combination...

I really don't have any comment on the inverted PItts muffler with the YS. I haven't tried it. I, just like Morbid and about 1 million other people, use a Saito 100 in my UCD. (The other million use the YS it seems).

I wouldn't bother using a high pitch prop on a UCD. That is not what the plane is meant for. I would suspect that flutter could be a problem with a high piched prop. These control surfaces are huge.

I forgot to mention that I'm using a 6V 1650mah NiMH battery so the torque I'm getting from my 3001's should be somewhere near 60oz. I went to 6V specifically for that reason. It also speeds the servos up a tad, although it's not really noticable.

As far as modifications, I made a few. I went with 4-40 pushrods on the control surfaces instead of the supplied 2-56 rods. I mounted my fuel tank about 3 inches back and used a cline regulator on my Saito. I did not use the stock tail wheel assembly because it felt cheap and weak. I used the sullivan instead. Other than that the plane is pretty much stock. You might look at beefing up the landing gear block as I've heard of a few people complain that it's weak. (Although I haven't done it). But for $189 the plane is a good deal. It's a big plane with loads of tricks up it's sleave. You'll like it.

Wood,

I have the YS91FZ on my UCD3D and I love it. I have used a 15x6, 16x4w, and currently use a 16x6 (all APC) on the engine and all have slightly different characteristics when flying. Ground clearance with the 16" prop is not a problem. You want to prop this plane for thrust and throttle response but not for speed (although I can fly at full throttle with the 16x6 and have not gotten flutter - I don't do it much though.)

I just use the YS91 stock muffler coming out the side. Three of them in our club are configured this way. Futaba 3004's work fine for me on the elevators. I have Hitec 525's on the ailerons and a 605 on the rudder.

I know its a long discussion, but all of the common mods are posted here. It's good reading.

Chris

here is what I have in mine
YS 91 16/4 prop
JR 531 on elevators and the rest are 517s

HI ALL...
my final setup:

saito 100
15X6 zinger
futaba 9202 X 6
6V 1500 battery
4-40 pushrods on rudder and ailron
sullivan tail wheel

tommorow the big day the test flight!!!
i'm so much exciting...i dreamed on this plane, realy want to fly 3d!!!

:-)

the saito 100 in break-in, how much rpm it need to be?

meeko, sounds like you have an awesome setup! You're going to love this plane. You should be able to find Saito tech specs at www.horizonhobby.com Good luck with the test flight!

thank u Flyfalcons
i realy hope thats everyting will be good...
the plane is realy big with a big engine...
mmmm.....ok thats looks BIG after my little Dazzler with 46fx.
hope i will land smooth!!!
realy afraid from the take-off and the land.

Meeko you will be surprised how easy the UCD lands. Especially if you are used to flying smaller planes like a Dazzler. I was so accustomed to flying small planes like my SE that when I went to land my UCD for the first time I was so impressed with how stable and easy it lands. The UCD is the largest plane I've flown and I was amazed how it's not effected by wind like the smaller planes. I fly at a site that has windy weather nearly all of the time and with the UCD I didn't even notice the wind.

I flew mine yesterday after going from a Zinger Pro 15x6 to an APC 15x6 prop and gained nearly 400rpm. The unfortunate thing was the added weight of the APC prop and the addition of the cowl moved my CG about a 1/4" forward which basically offset the benefit of the extra rpm's. I'm going to try and move the battery pack back some to readjust the CG. Right now it's at 5.5 and I'd like it around 6.

Does anyone have pictures of battery access hatches that they've cut in the fuse?

Hi Meeko...

Do not concern yourself with the takeoff and landings...


The U3D is unbelievably light on it's "feet".... I'll be willing to bet that you find it easier to taxi, akeoff and land than your Dazzler.... It is bigger, but with extremely LOW wing loading... it floats in and can really go pretty slow before tipping.... (in other words.. unless you try and harrier it in rigt away, you'll have NO problems.


Just think of it as a funfly... as you play around with various maneuvers and get a little out of whack, just go to about 1/8 throttle and let the plane fly out... correct for upright flight, and go back at it...

The U3D will not drop like a rock out of a situation, but float.

Meeko, my UCD's maiden flight is today, as well. There are four of these at my club (mine makes #5); I've flown two of them, and it is simply an amazing model airplane- which is why I bought one...<G>

well i was wondering if the u-can-do-3d is too much for me i think it mite be but if i have the throws low enough maybe i could fly it right now i'm flying a avistar 40.

Is the Avistar the only plane you've ever flown? If so I'd recommend maybe something like a 4*, a stick, Tiger 2, etc. Although I will say that the UCD will fly like a gentle giant if you set it up correctly. No one can really give you concrete advice without seeing you fly. Generally though, you wouldn't think of a UCD as a step-up from an Avistar. It would make a good third plane. Get some experience on a low wing trainer type plane before looking at a 3D aircraft.

wooohooo so love u all....
i'm so glad to raed the threads.
hope that will be easy like my dazzler!!!

I think the UCD could make a second plane for the right person, and if you are able to wring out an Avistar then you should be able to handle the UCD on low/medium rates. You will have to learn throttle management with this plane, and you'll also have to have some restraint, as the plane is capable of many maneuvers that you might not be ready for yet.

Just curious, I have an OS 91 FX on my UCD. I was wondering if anyone has experimented much with props on this engine? I have flown about a half dozen flights with a 15-6 Zinger and it's okay but I have never been too fond of the zinger props. I have a 15-6 Pro Zinger on order at LHS. I really like the master airscrew wood scimitar series but they don't make a 15-6. I want to try the APC 15-6 and 16-4 but can't get them local and hate to mail order for just a couple props. If anyone has tried any of these and can let me know which they like or don't like, it would save me a little money.
Thanks,,,basmntdweller

I don't have a 91FX in my UCD, but it does have a ST 90 if that will help. I tried a 15x6 Zinger, 14x6 Zinger, 14x6 Rev-Up, 14x6 APC, 13x8 APC, and 15x4 APC. I liked the quicker spool up times of the wood props.....but overall the UCD flew best with the APC 15x4. For a 91FX, I'd start with the APC 15x4 and experiment from there.

Thanks Dave.
I'll try to order a couple of those.
basmntdweller

I've been flying for 17 years, so I may be making some subconscious adjustments, but I feel like the UCD is gentler to fly than a trainer, especially if set up with low rate switch or a lot of exponential. We were flying a coupla of 'em around last month off a field severely restricted by snow and mud, and it feels like you can take off and land on a patch the size of a beach blanket!

mt

Flew mine today for the 2nd time in 20 mph winds. Coming into the wind I could get it to hover into a landing with throttle management. What a plane!!!


John

In some ways you are right. I think the reason is because the UCD is so much bigger than the average trainer that it doesn't suffer from "the wobbles" like a trainer would. I'm sure you know what I mean. Especially on a slightly windy day.

Any low wing loading symmetrical wing airplane will be the easiest plane to land. I always have the hardest time landing trainers well, when taking newbies up. Oftne trainers are a bit nose heavy, throws are very conservative, and they are flat bottom wing. This combination makes it hard to slow them down to the speed where the wing doesn/t develop lift anymore, so touch down always happens at a to fast speed, and the plane jumps down the runway for multiple landings he he. With the symmetrical wing, once you take the AOA out of it, it doesn't generate lift anymore, and because of the low wing loading you don't have to worry about tip stall or other bad tendencies
DKjens