ORIGINAL: NM2K
ORIGINAL: ThumbSkull
Many people confuse HP with thrust. A Saito 56 will have plenty of thrust for that airframe.
You could put a 3 horsepower pylon engine on there and get less thrust than a 56 Saito.
The Pylon engine uses RPM to get high HP numbers with a small prop.
The Saito 56 will use a large prop to give a low HP number but will have greater thrust.
More horsepower makes more thrust every time, when the proper propellers are chosen. I said in my post to mount the four-stroke's large prop on the OS .46LA and watch it out turn the four-stroke, which will provide the same or more thrust.
If you're a mild type of flyer that floats around at half throttle most of the time, you might not notice the difference in power between similarly sized two and four-strokes. You could even begin to believe that the four-strokes better throttle response makes it a stronger engine You could, because after all, your model is already grossly overpowered. But when it is time to takeoff from a dew moistened wet grass field, the extra power provided by a two-stroke of near the same displacement will impress you. Just do what I do - use a larger four-stroke! <G>
Ed Cregger
Ed,
Here is just one example where more HP does NOT equal more thrust.
Case 1 is Saito 56 and Case 2 is a pylon engine at nearly twice the HP but less thrust.
