I have a U-Can-Do 60 with a OS 91FX, what prop would be better for 3D?

Hi, I have a Super Tiger 90 in mine and I have found that an APC 14x4 wide is the best all round for 3D.

You just had to waste your money ang go with a OS huh. YS 63, use 14X4 (yea just as strong as the OS 90), YS 110 use 16 X 4. Just because the prop size will allow higher rpm, you don't have to use it unless its panic time. Learn throttle control, a major component to 3D, and above all, enjoy.

Stupidity has a price that is always paid.

Hi rmenke,
Sorry I don't have your knowledge but I'm willing to take your advise and learn. I've just used until now 2 stroke engines that look much simpler. What do you find are the advantages of a 4 stroke? Are 4 strokes more difficult to start, tune, etc..? Would you go for YS63 or YS110 on the U-Can-Do 60?

ilasa...I think the OS91FX is an excellent engine for the 60 UCD. Don't let the above comments make you feel bad. The YS63 in no way has similar power to the OS91. The YS110 is more similar and is a very good engine for the UCD. That's what I have on mine. I've use an OS91FX on my Ultra Stick and really liked the engine. It will do fine on the UCD. I'd start with an APC 15x6 prop. It should handle it fine. My belief is the 14x4W wouldn't be enough prob for the 91. The next step would be the 16x4W. That will work also.

Enjoy your UCD60. It's one of my favorite planes.

Thanks
Barry

I've flown my UCD 3D with a host of various motors:

ASP .91 2-stroke
Saito .91
Saito 1.00
YS 1.10
Enya 1.55

With the .91 2 stroke, full throttle thrust is adequate, but the throttling response is poor when using a heavy prop like APC 15x4W. On the other hand, APC 14x6 gives pretty good thrust too with better response. But this plane benefits from extra prop wash going over the tail. So you can try both of these props and see which one you like better.

Saito 91 is a little under powered

Saito 100 is about right, but I like a little more. Maybe Saito 100 w/ 30% heli fuel would be perfect

YS 110 is more power than it needs, but I now have floats on my UCD, so the 110 pulls the extra weight nicely. I do not feel 16x4W prop is a good match for this engine. I tried this prop, and it swings it at over 10k rpm. I felt using APC 16x6 @ 9900 rpm makes the plane perform much better.

1.55 4-stroke is just too heavy for this plane. The extra power you get does not justify the weight gain and nose-heaviness.