1. Propulsion QDR Scott Bird Mike Downes Kelby Haase Grant Hile
Cyrus Sigari
Sarah Umberger
Jen Watson
October 23, 2003
Propulsion QDR

2. Preview Choice of Engine Redesigning of Propeller Manufactured Choice
Cruise Conditions
October 23, 2003
Propulsion QDR

3. Preliminary Choice for Engine
BME-50
Power = 5.0 hp
RPM:
Weight = 3.25 lbs.
October 23, 2003
Propulsion QDR

4. Propeller Sizing – Sizing for Take-Off
Take-Off Velocity
CLTO C
October 23, 2003
Propulsion QDR

5. Propeller Sizing – Sizing for Take-Off
Lift and .7*VTO
Thrust at Take-Off (Brandt et al p. 176) C
October 23, 2003
Propulsion QDR

6. Propeller Sizing – Sizing for Take-Off
Used modified gold.m code
Varied Pitch and Propeller Diameter
Max RPM = 9800
Velocity Ranged from 5 ft/s to 55 ft/s in 10 ft/s intervals
October 23, 2003
Propulsion QDR

7. Propeller Sizing – Efficiency vs. Power
October 23, 2003
Propulsion QDR

8. Propeller Sizing – Sizing for Take-Off
With D=18 in., P=6 in. and VTO = ft/s
Efficiency = 40 % C
October 23, 2003
Propulsion QDR

9. Propeller Sizing – Manufactured Choice
Menz "Standard" 2-Blade Wood Props
18X6 Propeller
$16.00
October 23, 2003
Propulsion QDR

10. Propeller Sizing – Cruise Conditions
Used second modification of gold.m code
Held Pitch constant at 6 inches and Diameter constant at 18 inches
Assume Velocity = 50 ft/s
Varied RPM
October 23, 2003
Propulsion QDR

11. Cruise Conditions Prop=18X6 Max Efficiency at approx. 4200 RPM
J = .475/rev
CT = .0155
CP = .01
Efficiency = 75%
October 23, 2003
Propulsion QDR

12. Questions?
Questions??
October 23, 2003
Propulsion QDR