PROBLEM 3: A 8m high and 15m long spillway discharges 84m3/s discharge under a head of 2.03.If 1:9 scale model of this spillway is to be constructed ,determine model dimensions, head over spillway model and the model discharge.
SOLUTION: 
(a)Model dimensions 
(b)Head over spillway model Hm
(c) Discharge through the model
PROBLEM 4:
The pressure rise from free stream to a certain location on the surface of a rocket is measured to be 20KPa at an air speed of 1000Km/h. The wind tunnel is maintained at 90KPa absolute and 288K .What would be the speed and pressure rise on a rocket prototype at an elevation of 15Km? Take pressure and temperature at 15Km are as 12.3KPa and 216.7k respectively.
SOLUTION: The Mach number governs the model study. Thus,
Pressure rise on a rocket prototype is obtained by equating the Euler's number 
of model and prototype.
