RE: Rossi engine info?
Hi!
When you look at the hp ratings you must also look at the rpm.
3hp at 18000 (must be a .60 two stroke!) and do you know what prop they used..?
Well, to obtain 18000 rpm they used a very small prop , like a 9x6 or 9x7. -Do you think this small prop could be used to fly a sport model well??? Well not that particularly good, a much better prop would be a 11x7,5 , 12x6 or 13x5. Wonder how many hp that engine deliver at those props at 10000-13000rpm ..? Well not that much...Say around 1,5 hp at best.
Soo! The thing is to understand those hp ratings correctly.
OS engines, or any other engine, are also capable of high hp ratings provided you prop the engines right !