I'm trying a fingering that basically limits white keys to fingers 1 & 5 and black keys to 2 & 4. This fingering seems good for non-legato for medium size intervals perfect fourths and augmented fourths. It seems to work for perfect fifths too, but I'm wondering if fingering 2-4 for two black keys it too wide a stretch?
May hand span is a bit more that 8.25 inches/21 cm, so a little little on the small side.
This 2-4 span doesn't feel uncomfortable after my hands warm up, but I think I will get fatigued from it fairly soon.
Is this fingering either strange or this 2-4 span pushing against a general limit?