I am planning on putting an OS .91FX on my U CAN DO. How is this working for you guys? I know alot of guys are using 4 strokers. I don't want to put out that $. I was also looking at a Magnum .91 (OS Clone). Great price $135.00 at Sheldons Hobbies. Thanks for the info.

I'm not a big fan of 4 strokers either.

A guy i fly with uses a Supertigre 91 (?). Seems to fit fine, and certainly does the job.

I get my new UCD tomorrow! I have a 91 FX for it. With a bit of luck and a few evenings in the shop, i might get to try it out this weekend.

Let me know how it goes. Thanks

OS 91 rocks it well. Play with some props like a 14-4 or a 13-6.

I have an Ultra Stick 60 with a Magnum .91 on it. I am running an APC 14-6 and it rocks. The plane is only 6lbs 7oz. though. I can hover it at a hair above 1/4 throttle. The Magnum is identical to an OS. as far as I can tell. I think I am going to go this route. I just want to know if the .91 2stroke will do the job.

Thanks

Hi Finnz I have a U-CAN with a FX 91 it flys it great pulls out of a hover with authority , I have played quite a bit with props my favorite is a 16x4 APC. pulls good and nice slow down lines. Mark,

That does not look like a standard UCD. Did you cut the tapered tips off of the wings? My UCD has tapered wingtips and the airfoil does not look nearly as fat.

hi
i planning to use this engine too, but i already have super tigre 90.
should i use the tigre or the os?
anyone tried to use the slimline inverted pitts fot os 91fx 0r super tigre90?

Tooly,
Good question on the muffler. Will it fit inside? That sure would look nice.
Thanks for the reply all keep them coming.

we use the slimline pitts on a 91fx but mounted side ways , needs to run fairly rich for good alround response.

Hi Mttomps Yes I cut off the tips it was terrible in knife edge flight you never new if if it was going to pull toward the canopy or gear.I bobbed the tips and sealed the aileron gap and its like a new plane tracks better and knife edges pretty good now. Mark

How does the ballance work out with the OS 91 in place? Any benefit in using lighter servos in the tail? (HS 225 MG) Or am i likely to add lead anyway? i also have standard servos that might work if i run them on 6 V. I also have a few HS 645MG's available. Those servo leads are going to be long! sheesh! i kwew it was long, but i had no idea!

So far i like it pretty well. Should be a cakewalk to get it all together.

So far i have the engine mounted up. I opted for the engine to be side mounted. Won't look as clean as Mark's but ....

I had to redrill the firewall to rotate the engine to about the 10 o'clock position so the exhaust will clear.

For what its worth I LOVE supertigre .90's but the pitts mufflers out there kill them ie needing a richer setting Ive found the Jtec muffler with an adapter is an AWEsome combo pulls my dago on a 12 X12 124 MPH WOW

u-can-do video wit os 91 fx

http://www.sanantoniorc.com/clips/01...cando_high.avi

Tooly,

Do you know what prop is on that .91fx? I am going to test a 15-4 apc on mine to see how it works.

i don't know what prop is in the movie, but from what i read in a lot of threads of the u-can-do, fx91 only with 15x4 or 16x4

I just ordered a couple of 15-4 to try out on my Ultra Stick. I will let you know how it goes. This is the test bunny for my UCANDO.