So I gave up waiting for the 120 Ultimate and decided to get the little brother to hold me over till the biggies arrive. I've searched RCU and really only found 2 really good threads on the plane and settting it up.

I'll be doing YSMAN's mod on the location of the elevator servo for better pull-pull geometry. I've got 4 HS 5245's (which will be going into the ailerons of the 120 size if it ever gets here) for the ail, rud, and elev, and an HS 81 on the throtle of a YS .63 FZ.

I saw somebody had a Macs 90 with a flex pipe on it for the muffler... I can't seem to find either of these for the YS 63. How do you like that muffler setup??? What are other people doing with the muffler situation tp keep it clean with minimal cowl cuts?

Another question on the engine is what orientation to go with??? Upside down or on it's side? I like upside down in that it's beter balance wise, but I don't want to have to rip into the cowl too much.

Last question for now is about the supplied engine mount. Do I go with it or should I upgrade?



Thanks for the info!


HSH

Somebodys got to have something to say about this!!!!


Also has the supplied fuel tank been able to handle the pressure from the YS???

My review is 99% complete...if you are building it I will send you a URL preview of the review which will fill you in on the details including relocating elevator servo in detail. I will publish this next week but if you are in the shop and want to reference it I'll give it to you privately as it just needs a few finishing touches before it's totally done and ready to be released on the site. It should help you. Click the "email" button under my post here to contact me if you want it.

I used a Dave Brown mount and built a stand off in order to get the propeller to clear to cowl.

If I had it my way totally, I would use an isolation mount. The plane does tend to act like a drum and magnify the engine vibration. The isolation mount I purchased was not the right size for the OS 50SX I used. So I gave up. Cash was lean at that point.

I was thinking about an isolation mount, but I was also thinking along the lines of keeping the weight down, and with it sounding like the model will come out slightly nose heavy with the YS 63, I'm probably going with a glass filled mount too.

Still debating about which orientation to mount the engine with the most minimal cowl cutouts as well as balance considerations.


any input on that is still greatly appreciated!!

Pictures, as promised, of the business end. Photo 1

Photo 2

Photo 3

Photo 4

Thanks jwatwood. I just finished putting the engine in and trimming the cowl. I ended up installing the YS .63 on its side rather than inverted.... That way all that's sticking out of the cowl is the valve cover....... it really came out pretty slick. Actually I'm pretty much finished with everything major as far as assembling. I did the elevator servo under the canopy mod and it really came out nice and clean. The center and outer cabanes all aligned perfectly along with every other screw hole. I've just got to figure out my muffler situation (I think I'm going to end up going with a Mac's 90 degree adapter and a flex pipe), and where I'm going to put the throttle servo (HS 81) which I'm about to go figure out. Then the fuel system and balance and it's ready to fly...... Just need a the weather to cooperate!!!


The only other thing I've been thinking about is the Landing Gear Attachment area needing some reinforcement. Hey Marc, I know you fly yours off grass.... have you had any problems or did you do anything to reinforce??? I fly on [pavement so if it can handle the grass I'm not going to worry.


Thanks for the Pics!! and the advice!!

I fly mine off of grass. I haven't any problems other than the wheel pants starting to show some cracking.

I didn't reinforce fuselage where the landing gear attaches

Good to know...... I'll see if I can get some pictures up here of the finished product!

Hey!


Been away for a while but not from flying. This little ultimate
is a great flyer. I will get you some pics of my ys 63 install with
MACS 90 and flex pipe. This set up is working extremely well.
It is just as quiet as the stock muffler and engine actually
gains about 100 rpm. It is mounted inverted so only the bottom
of the cowl has to be relieved.
Will have pics soon

YSMAN

YSMAN,

good to hear from you.....I gotta say that mod you did with the elevator servo (I'm pretty sure... if I remember correctly from reading all the threads on this plane that you where the first to post on moving the elevator servo to under the canopy) is quite easy if not easier than the way the book says to do it and really make the pull pull geometry for both the elevator and rudder just right on....quite pleased with that!!

As for my Ultimate I'm still figuring out the exhaust... I think I'm probably going to end up with one of those OS flex pipes for their 70.... But it might be too long. Since I decided to mount the engine on it's side and to counter balance the engine head with the battery I can't see using a Mac's 90.... I think it would have to be a flex pipe with the straight adapter.... I wonder which pipe is more narrow.. The Mac's or the OS? I'll probably end up letting the weights dictate which I go for.

The only other thing holding it back from flying is that my HS 5245's that I have on my rudder and elevator glitch randomly when I'm running them off of a 6 volt system...but smooth as silk on 4.8 volts. I've sent them into Hitec but no word yet. Has anyone else had this problem with Hitec digitals where they glitch or jump on 6 volts???

Has anyone tried the recommended YS .45 2 stroke engine? I have been thinking about this for a few days now. I was planning to put my Super Tigre S-61 on it, but it seems that everyone else has found smaller/lighter engines to be more than enough. Maybe too heavy is my biggest concern. The newer G-61 is 19.96 oz. I still have to weigh mine to see what it ways, but I am sure it is 20+ oz. I did have this engine with a tuned pipe on a Hobbico Ultimate .40 size swinging a 12x6 APC a few years back and that combo was incredible, but it would roll it 1/4 round if you went from idle to WOT too fast.

jwatwood did you end up deciding to use the Perry pump on you Ultimate? Are you going to use it on your new one? I have thought about the OS .50SX also, but if I have to pump I may as well go with the YS it seems. BTW, sorry to hear about your plane. My wife is gonna kill me if I crash my Anniversary present in short order.

I cannot afford the YS .63, unfortunately. Besides the idea of adjusting valves on yet another engine is not really appealing.

I can hardly wait to start my DP Ultimate 40.

Thanks
Chris

Chris,

Yes, I used the OS 50SX and the Perry Pump on the second plane. I don't have any experience with conventional four strokes and didn't want to start. Also they are more expensive. I wonder how the RCV 58 four stroke would work on this plane. It doesn't have any valves.

I have a RCV 60 for SIG miniplane I am building. It is probably too much engine.

Anyway, if you place the OS engine on its side the fuel has to go two inches vertical to get to the carb. I figured it just wouldn't draw. In hindsight, a better choice would have to mounted the engine inverted.

I decided on the pump for the utmost in reliable fuel flow. I am considering trying to compete in the beginning class of IMAC.

The OS 50 SX has plenty of torque. If you are heavy handed on the throttle at low speed it will roll on you. I use a 11.5 x 6 prop. I have good acceleration and very near unlimited vertical.

Decisions, Decisions, have fun with yours...

I would like to go with the OS 50 for cost, of course. I also have a Perry pump, but it is about 8 years old. Come to think of it I have a Pitts style muffler that might fit it too. Hmm. Maybe that's the way to go. I really think the .61 will be too much.

I too have never used a 4 stoke. 1 consideration though is that a 4 strokes stock muffler will work. The 2 strokes mufflers will not. An OS 50 with a Pitts style muffler is within a few bucks of the Saito 72 though. I have always heard from everyone that uses 4 strokes they like them better.

jwatwood have you tried to hover with the OS 50?

I think you're making out the valves to be far more work than they really are. They are simple as can be to adjust, easy to access, and well.... I've never had the valves go far out of adjustment.... I check them after the first hour of run time, and then pretty much forget about them. I pretty much check them at the begining of the season, or when ever I'm just tinkering... It really takes less than 5 minutes.

Once you get a 4 stroke you'll never feel the same about those screaming 2-strokes.

Chris,

Yes, I have tried to hover. I am not skilled at that maneuver in any sense of the work. I have torque rolled the plane purely by accident. I can honestly say that I didn't know what I was doing other than point it up and throttle back to a little less than half throttle.

Because I fall out of it every time, I can't say that I can pull out of the hover vertically. I can say that after the plane breaks ground on the take off run I can point it vertical and it will go straight up and out of sight.

Some of the 3D guys using the OS 50 SX are putting a 12x3 prop on the engine. Look out for the noise.

Jim

HighSierraHelis I just heard the valve adjusting mentioned and thought of adjusting the valaves on automobile engines with solid lifters. I always thought was very tedious. I won't worry about these little valves then. I can handle adjusting them 1 or 2 times a year. Have you had any issues with the YS engines causing the fuel tanks to leak?

If I can muster the cash I would love to try a YS .63.

jwatwood I am not any able to hover either quite frankly. Heck I have never tried. I just want to make sure that when I do try the engine won't be my limiting factor, but rather me and my ability to fly. It sounds like the OS 50 will do just fine if need be.

BTW, I previosuly mentioned my ST 60 being possibly too heavy, well the local Post Office, on 2 diffrent scales, weighed it for me at 13.50 oz. The JTEC pitts muffler was another 2.70 oz. I thought 16.20 oz for a .60 size engine was dang good. If this engine still runs I'll likelt use it. It was simply spectacular on my Hobbico Ultimate, absolutely unlimited vertical at just over 1/2 throttle and it weighed nearly 6 lbs. Course it's been on the shelf for 9 years now.

Thanks guys.

I just finished assembling my DP Ultimate 40. I used YSmans mod for the elevator servo with excellent results. Hitec 5245 all around except throttle which is a Hitec 81. I used a 6volt AAA 750mah battery pack. Everything else is stock to the kit. OS50SX with a Bisson pitts muff. 11x6 APC prop and this thing flys fantastic! 5lbs 5ozs dry. I "re-arranged " the color scheme a bit to make it at least a little original (for an ARF). I simply pulled off the yellow and orange trim and added black striping. The cowl was a little tricky. Mask the red and black, sand the yellow and orange paint off and add black. Add some decals (I had some call letters left over from an Extra I built - I know they aren't correct, but they look good) and you have a new look.

Thought this might interest someone. I'll throw in a couple of pix.

Photo 2.

Photo 3.

Looks pretty slick, Nice job!! I was wondering about your 5245's... I've got 2 of those which just won't work on 6 volts (the randomly glitch)... and Hitec says they're ok......but They do it on 3 differnet RX's of mine and only on 6 volts.... Thing is I see you're a JR guy and I use futaba.... but by chance have you had that problem?? or anyone else hear of those 5245's doing that?

reznor,

Great job on your bipe! How did you squeeze the 50SX in the cowl without cutting an opening for the head?

I see you used DP's upgraded tail-wheel. Is that working out for you?

Are you getting good fuel draw? On my install I was worried about the difference in height between the top of the tank and the carb. As a result a used a Perry pump.

Again, nice job!