Team 5 - Propulsion PDR #2 Scott Bird Mike Downes Kelby Haase Grant Hile Cyrus Sigari Sarah Umberger Jen Watson November 11, 2003 Propulsion PDR #2

Preview Update of Constraint Diagram Choice of new Engine Redesign of Propeller Propeller Choice November 11, 2003 Propulsion PDR #2

Which plane are we talking about? Tail Dragger Flaperons Pod Tractor Engine November 11, 2003 Propulsion PDR #2

Constraining Conditions Inputs: CLmax = 1.8 ηp = 0.4 Cdo = 0.03 STO = 127.5 ft AR = 7 Vstall = 30 ft/s Outputs: W/SHP = 14 lbf/SHP W/S = 1.8 lbf/ft2 November 11, 2003 Propulsion PDR #2

Choice for New Engine Updated HP requirement = 3.6 Previous engine was overpowered November 11, 2003 Propulsion PDR #2

Engine Specifications OS Max 1.6 FX Cost: $270 Not Fuel Injected Gravity fed fuel system Weight: 2 lb Uses glow plug RPM Range 1,800-10,000 3.7 HP at 9,000 RPM Side exhaust muffler with rotatable exhaust outlet Comes with illustrated instructions booklet with parts list and OS decal  November 11, 2003 Propulsion PDR #2

Propeller Sizing – Sizing for Take-Off Used modified gold.m code Varied Pitch and Propeller Diameter Max HP at RPM = 9000 Velocity Ranged from 5 ft/s to 55 ft/s November 11, 2003 Propulsion PDR #2

Propeller Sizing – Efficiency vs. Power Increasing Diameter Increasing Pitch V = 40ft/s Propeller Choice: 19x6 November 11, 2003 Propulsion PDR #2

Thrust Verification (FBD) Normal Drag Thrust Our Airplane Friction Weight November 11, 2003 Propulsion PDR #2

Efficiency vs Velocity for 19x6 Propeller ηp = -4e-5V2 + 0.0117V -0.0004 Best Fit line for velocities from 5 ft/s to 120 ft/s November 11, 2003 Propulsion PDR #2

Putting EOMs into MATLAB Put state space EOMs into MATLAB Used ode45 command to integrate EOMs Inputs to the code are initial conditions for position and velocity Used x(0) = 0.1ft and v(0) = 1ft/s to eliminate singularities Code output position and velocity as a function of time November 11, 2003 Propulsion PDR #2

Output from EOM integration W/S = 1.8 lbf/ft2 ρ = 0.023 slug/ft3 CLmaxTO = 0.8*CLmax = 1.44 November 11, 2003 Propulsion PDR #2

Output from EOM integration tTO = 3.7 s STO = 76 ft November 11, 2003 Propulsion PDR #2

Propeller Sizing – Manufactured Choice Bolly 19x6 Weight = 0.25 lbf Price = $53.00 Material: Carbon composites Comments: A low speed prop for 25-30 cc engines http://www.bolly.com.au/models/glasstwo.html November 11, 2003 Propulsion PDR #2

Propeller Specifications (from Manufacturer) Modified Clark-Y Airfoil Twisted 4o at the root Reaches maximum twist of 6o at ~70% of the radius Maximum cord is 1.54 inches No graphical information exists about lift distribution November 11, 2003 Propulsion PDR #2

Propeller Sizing – Cruise Conditions Used second modification of gold.m code Held Pitch constant at 6 inches and Diameter constant at 19 inches Set velocity = 50 ft/s Varied RPM Maximum Efficiency of 75% occurs at J = 0.46 1/rev RPM ~4100 November 11, 2003 Propulsion PDR #2

Cruise Conditions J = 0.46 1/rev CP = 0.0092 CT = 0.015 Velocity = 50 ft/s RPM ~4100 CP = 0.0092 CT = 0.015 November 11, 2003 Propulsion PDR #2

Alternate Cruise Conditions Vary velocity and RPM to find maximum efficiency Maximum efficiency occurs at J = 0.46 1/rev November 11, 2003 Propulsion PDR #2

TakeOff Requirements Satisfied! Cruise Conditions: Summary New Engine: OS Max 1.6 FX with 3.7 HP at 9,000 RPM New Propeller: Bolly 19x6 carbon composite TakeOff Requirements Satisfied! Cruise Conditions: Velocity = 50 ft/s RPM ~4100 Efficiency ~75% November 11, 2003 Propulsion PDR #2

Next Steps for the Propulsion Team: Summary Next Steps for the Propulsion Team: Verify takeoff calculations ITERATE as other values change (yay!) November 11, 2003 Propulsion PDR #2

Questions? Questions?? November 11, 2003 Propulsion PDR #2

EOM file in MATLAB November 11, 2003 Propulsion PDR #2