Aero242                                            Quiz 3                                                         S99
                                                                                         Name _________________
A light propeller-driven aircraft has the following characteristics:
Wing span             35.8 ft
Wing area             174 sq ft
Gross T/O Weight             2950 lb
Fuel Capacity             65 gal aviation fuel
             1 gal fuel weighs 6.67 lb
Power Plant             230 hp (@ MSL)
             internal combustion engine
SFC             0.45 lb/hp-hr
CDo             0.025
Oswald efficiency, e             0.8
Prop efficiency             0.8
Max R/C @ MSL             1500 ft/min
Max R/C @ 20,000 ft             331 ft/min

I. Shortly after take-off from sea-level, after climbing out to a height of 2000 feet, the above a/c loses all engine power and turns back to the airfield. What is the maximum distance it can be from the field in order to land there safely? (assume sea-level density throughout the glide). ____________ miles
II. For a flight at 10000 ft above MSL (assume it begins with a weight equal to its gross take-off weight),
what should be its initial
a. speed for level flight at minimum power ____________ ft/sec
b. speed for level flight at maximum L/D ____________ ft/sec
III. What is its maximum range at 10,000 ft altitude? ____________ miles
IV. What is the a/c service ceiling? ____________ feet

 
altitudedensity, slugs/ft^3
sea level0.002377
10000 ft.0.001756