[siouxbrew]

not too difficult of a problem but cant seem to figure it out.

the rate of climb is given as 674 feet per minute and the optimal angle of climb airspeed of 78 knots those are the only numbers given, basically vertical 674 fpm horizontal im assuming 78 knots, my friend seems to think it should be tan(a.o.c)=674/78, i keep comming up with 83.4 as an answer and this simply does not make sense, help set me straight or show me where my math is wrong, thanks.