ORIGINAL: Cherokeepilot
The -3.5 oz of weight doesnt seem like much, but that equals a lot less nose weight to balance the nose. Planning to fly just off water.
I am interested to hear from other pilots how they have powered their Seawinds? How much lead weight was added if any? what size prop used, 2 blade or 3 blade? What type of aftermarket muffler if used? I personally will cringe to put the 10inch long stock muffler on my OS91 FX. If I stayed with the 91 2stroke, wonder if a Pitts muffler would be suitable or any other type more scale than the stock muffler?
Actually, the engine is located about 7" behind the CG, so extra 3.5 oz there is equal to less than 1 oz at the nose, which is 28" forward of the CG (4 times the leverage).
I don't think the Pitts muffler for a 91 4-stroke will fit in the cowl. The cowl space looks pretty slender vertically.
If you want a 3-blade, get a Graupner 12.5x7 3-blade, since it looks nicer than Master Airscrew 3-blade, which comes in 13x8 size.