Kyler Marutzky

Motor and Battery Analysis

Objective

Motor capable of powering a 20 lb. aircraft.

Provide enough energy to the motor for a minimum 40 minute flight.

Motor capable of attaining airspeeds of 40 mph.

Motors Considered

ElectricBrushless

Gas2-stroke engine

Why Electric?

Less vibration to the rest of aircraftPhotos are being taken.

Center of gravity doesn’t change throughout flight.

Advancements in RC electric motors have made them very efficient.

Configuration

Pusher Ducted Fan Puller

Chosen for this application

Twin engine

Motor

Hacker A60-16M2276 max Wattage65 max Amperage35 max VoltsFully capable of lifting a 20 lb. aircraft.

Over compensated sizeFuture endeavors.

Type of Battery

Lithium PolymerLight weightCapable of supplying more energy than

NiMH and Cadmium batteries.

Battery Needed

Capable of supplying up to:1500 Watts (~50 Watts/lb., ~20lb aircraft)35 Volts65 Amps

Flight constraints:Capable of supplying enough energy to

sustain a 40 minute flight.Capable of providing enough power to the

motor for 40mph airspeeds.

Battery Chosen

9s3p Lithium Polymer9-3 cell batteries3 cells in series3x3x3 cells in parallel

Cell4.3 Amp/Hour3.7 Volts

Calculations Peak power to motor

Watts = Current * Volts○ Current = 4.3 Amps * 9 = 38.7 A○ Volts = 3.7 * 9 = 33.3V○ Power = 38.7A * 33.3V = 1288 Watts

Duration of flightFlight time = Amperage/(Amperage/Hour)

○ Battery Amperage = 38.7 A/Hour○ Average motor amps = 32.1A○ Flight time = 32.2A/(38.7A/H) = .83 Hours

In-Flight Analysis

Questions?