ORIGINAL: iiiat
I just purchased a Graupner 15x8 3-blade and hope that'll be a good match with my 1.20 4-stroke.
No 1.20 4-stroke can swing the Graupner 15x8 3-blade except for the supercharged YS 120. All naturally aspirated 1.20 4-strokes can only swing the Graupner 14x7 3-blade.