I've flown with several engines, including Super Tigre, OS, and Evolution. Of the three, the OS engines were far superior in reliability, starting, ease of tuning, and endurance. They were also great in the power department, although there are some that have more. But, that's always a give-and-take situation in that they may not last as long as an OS.

I still have my first OS engine and it runs just fine. I have three OS 1.20 AX's, two OS .75 AX's, several OS 46's, and an OS 50. All run great. I'd never own anything else.

There was a posting a short time ago about selecting a radio. The choices were give, the usual, but one person made a statement that makes perfect sense to me. Buy what you need, and what performs for you, but consider the future and if you will have to buy another because the one you originally bought wasn't good enough for future uses.

Stick with OS engines. You'll never regret it.

CGr.