come on guys!
I mean climb or descent in percentage, say h%, is merely h feet vertically in 100 feet horizontally. It is schoolboys and schoolgirls the tangent of the angle "a" =h/100.
But your vertical speed and horizontal speed must be in the same proportion. Little v for vertical, Big V for horizontal.
Therefore h/100 = v/V = tan "a" where both v and V are measured in the same units.
Therefore v = V tan "a".
Committing the gross sin of assuming a nautical mile is 6080 feet
v = (Vh/100) * (6080/60) = Vh*(6080/6000) = 1.013333Vh
which is nearly Vh in my book.
ROD fpm = GS knots * %age gradient.
At 240kts and 3% is that 720fpm? At 120kts and still 3% is that 360fpm?
I theng you
I'll get my coat.....