I have started on my Four * 60 winter project and wanted to get some ideas of engine options. I know a lot of you have this airplane and would appreciate it if you could share what you used and how the choice worked out. Thanks in advance for the input
-Tom

Hi Tom,

I use an OS91 Surpass II turning an APC 15X6 and love it. Needed no weight at all and will climb vertical until I tell it to stop

I sold mine before moving back to CT but I had a Satio 91 GK on mine and yes it would go up till you told it to stop.I now have another 91 GK and a Venture kit waiting for glue.

I had a 4* 60 with a .91 four stroke. Good combo. Now my brother has it and is running a .61 2 stroke. It does ok but I liked the 4 stroke better.

Had an OS61FX on mine and it was fine.

I am flying my 4 * 60 at 4300 ft elevation with a TT 91 4 stroke. I am using a 14X6 Master Airscrew Prop. This set up is great, balances perfect. Also I have used a YS 91 AC on this plane. I believe that I liked the TT better seemed to pull vertically better. Could be management of the prop. I was using a 15x8 prop on the YS. Also I had to move the battery behind the servos to get proper CG.

I have heard of guys using a Saito 100 4 Stroke. Weight is the same as a Saito or OS .91 4 stroke
with a bit extra umph. So that is what I am going to use. My first 4 stroke and I've heard this plane
just isnt the same with a 2 stroke.

That's also a very good match. We have one guy at our field that flies this combo and loves it. He uses a three blade prop so I'm not sure of the pitch/diameter but the plane hauls bootie

I have owned two 4*60s and flown several others and here is my assessment.

2-stroke .61, full wing: Sort of pokey, not much vertical, slow on rolls. Flies like a big, low winged trainer.

2-stroke .61, clipped wing (1 rib each side): Still pokey, but faster on rolls.

4-stroke .91, full wing: Good hi-performance sport plane, good vertical.

4-stroke .91, clipped wing: Better due to faster rolls.

2-stroke .91: Most power, excellent vertical, best with a clipped wing.

My 2 were kit bashed into a "sort of" Kawasaki Tony with clipped wings, rounded tips, scale tail and gear mounted in the wing. One had an OS .91FX with an Ultra Thrust muffler. The other had a Magnum .91XLS with an Ultra Thrust muffler. Both used 14-6 APC props and both turned 12,000 rpm. I could not ask for a better sport/acro plane.

If you are interested in the Ultra Thrust, call Performance Specialties. They make two for a .91 2-stroke, a short one for running .61 size props faster, 12-6 at 14,000+, and a long one for the 14-6. They really like to rev up the OS .91.

Bubbagates - I would be interested in what three-blade prop is being used on the Saito 100 if possible.