Weedfix

The fundamental difference between the OS and YS 4 strokes are that YS are 'supercharged', thus producing more horsepower and a sweet idle. They also do not require a pump, should you choose to mount your fuel tank amidships (to prevent trim changes as the tank drains).

I agree with Buzzlightyear in the nitro content issue. You don't necesserily need high nitro fuel. 15% will be adequate for a starting point. You can experiment with more nitro/differnt props as you clock up more practice time.

I personally run 20% for my YS 91. However, in my 2 metre ships I am running 1.40 2 stroke supertigres , with Perry pumps, swan neck headers and tuned pipes, running on only 10% nitro. If South Africa is like OZ, then nitro isn't cheap!

I would 'keep it simple' to start with. As you attend more pattern comps, you'll see all manner of set-ups. Ask questions and look around. No-one will mind, and most will only be too happy to help.

If you go with any of the powerplants mentioned above, you can't go too wrong. I think it's more important to be concerned about a nice clean and tight control set-up. Don't skimp on servos or connectors, and seal all control surface hinge gaps. You won't believe the difference this can make to your pattern flying.

Good luck and have fun.

Chunkylad