Rate of Climb and Climb Gradient Question
First post…
I have been given some rate of climb and climb gradient data and am having difficulty calculating the true airspeed used. I would really appreciate some advice on where I am going wrong.
Example data @ ISA and sea level
Gross Climb Gradient = 0.2014
Rate of Climb = 2,590 ft/min or 25.57552 nm/hr
My solution
ROC = KTAS * sine(Gross Climb Gradient)
= KTAS * Gross Climb Gradient (sine dropped due to small angle approximation)
Leading to
KTAS = ROC / Gross Climb Gradient
= 25.57552 / 0.2014
= 126.988
~= 127
My problem lies with the known indicated airspeed, which is 125 KIAS. Can anyone point me to how 125 KIAS becomes 127 KIAS?