Hi,
As I have recently posted I am running a O.S. .46 in a U-Can-Do .46. I since then have gotten better at hovering and would like to make this hover. Would it be neccesary to go to a O.S. FS 70? Or could I just get a 55 AX?
Thanks,
Andrew

I was running a Saito 82 in mine...

R/C Foolish

What is your all up weight now?

If it is near the 6lb mark, a 55AX will be enough with a macs #6720 or #6724 one-piece muffler.
The stock muffler may leave you a little short of good pullout.

My personal choice for this would be a YS70. That will get it done and put a smile on your face.
In comparison the YS70 is a good 3 oz. lighter than the OSFS70 and has MUCH more power.

I use a Saito 82 in mine and it's great.

I ran an OS-50sx-h Helicopter engine (not hyper) and was not happy with the pull out power. I would look at an OS-75 or Saito 82. A little more weight but the UCD has really light wing loading.

If you have the $, get a YS 63 or whatever they have in that size now. plenty of pull and light. The OS 55 will also work with noticable improvement.

If you plan on changing aircraft soon, keep the motor choice flexible to work for both.

4 strokes are mostly preferred as the power curve is very ideal. Please omit HP postings, they do not represent real usable power during flight.

I had an OS.91 4-stroke in mine and kept the speed down with a 15x4 APC prop. Just about right with the power, but I also used digital servos, and 4-40 sized control rods with Sullivan steel control horns to handle the air load on the control surfaces.

Try the new YS70 in it. I have mine in a Reactor 46. A lot more power than the Saito82.

I would not recommend the Y.S. unless you have some 4 stroke experience under your belt, OS or Saito 82 is more than enough for the U Can.

The new ones run great right out of the box.No regulator adjustment to deal with. The 70 pulls like a 91

YS engines are very much more reliable than the older ones. It's been the round disc regulator that has helped the most.
Much less plumbing than they used to have also. No reason not to trust YS now, even for a 'new to 4-stroke' user.

I would try one but I have never seen anyone get a Y.S. to run where I am from, that is over many years as well, from 2 Stroke heli motors to the 4 bangers. Even the local guru with over 40+ yrs experience tried to get one to run correctly, he played with compression ratios, plugs, fuel and all sorts of ****y stuff and even he had trouble. They do not like the heat and humidity here I think, I bought a Y.S. 91 a few years back and was unimpressed with it, it did not have the power I have heard people rave about,they may be a dam fine motor in some parts of the world but not here.

The beauty of YS is they have a "supercharger" effect. So any time you are at higher elevations you will see a "real" power difference. I've flown a lot of YS engines. Mostly the 110s but I have one 63. Once you get them dialed in there is absolutely no problems with them. In fact, I tune the YS engines less than the OS or Saito engines. After I get them tuned the first time. Most problems I had was with the regulator. Just open it more (2.5 turns) and they instantly become reliable.
The 110 puts out about the same power as a Saito 150. The other trick is to use a minimum of 20% nitro. I use 30% and that makes them run very reliable.

They can be a bit tricky to set up the first time. But it is worth it to see the monster power these babies put out.
Thanks
Barry

I always love the comparison to the Saito 150, Saito make a good engine but the 150 is a dog!! </p>