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EAS BOAT DESIGNFRONAJ COMPANY

GROUP I1-D

NATHANIEL BORSTFRANK IEMMETIJASON SCHANILRIDWAN SADIQORSON ZHONG

EAS199 SECTION IDR. HAGGERTY

11/ 28/ 2016

PROJECT OBJECTIVES/PROBLEM DEFINITION

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CONCEPTUAL MODEL OVERVIEW

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PROBLEM DEFINITION:

➢ Ability to race a minimum of 5 meters in the shortest time possible

➢ Use materials that are buoyant and light

➢ Build within given size restraints➢ Use batteries that will help maximize

the performance of the boat

KEY PERFORMANCE METRICS

1. Best time for vehicle to complete course

2. Weight of the boat

3. Voltage of the battery

SWITCH

BATTERY

MOTORPROPELLER

GUTTER WIDTH: 9CMGUTTER LENGTH: 5M

WATER LEVEL 6CM

HULL HEIGHT: 2.5CM

OVERALL LENGTH: 24.5CM

CONCEPTUAL MODEL

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GUTTER WIDTH: 9CM

GUTTER LENGTH: 5M

WATER LEVEL: 6CM

BATTERY

SWITCH

MOTORPROPELLER RED WIRES

BLACK WIRE

FOAM HULL

BOAT WIDTH: 8CM

BOAT HEIGHT: 2.5CM

OVERALL LENGTH 24.5CM

GENERATION OF ALTERNATIVES

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IDENTIFICATION OF DESIGN FACTORS

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DESIGN FACTORS IDENTIFIED

Number of Batteries Number of Propeller Blades

Number of Motors Color of the Boat

Weight of Boat Technology Available Onboard

Design of Front of Hull Exterior Protective Layer

LINK TO PERFORMANCE METRICS

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DESIGN FACTORS IDENTIFIED KEY PERFORMANCE METRICSNumber of Batteries

Number of Motors

Number of Propeller Blades

Weight of Boat

Design of Front of Hull

Color of the Boat

Technology Available Onboard

Exterior Protective Layer

1. Time for vehicle to complete course

2. Weight of the boat

3. Voltage of battery

COMPARISON OF ALTERNATIVES

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ALTERNATIVE DESIGN 1

ALTERNATIVE DESIGN 2

ALTERNATIVE DESIGN 3

DESCRIPTIONAdd multiple

propellers to current design

Use water bottle as hull for the boat

design

Just carve out room for parts in block of

styrofoam

ADVANTAGES

More thrust and acceleration

Readily available, Buoyant, Would

simply need to cut bottle in half horizontally

Buoyant and Lightweight

DISADVANTAGES

More components mean boat would have to be bigger

than specified dimensions

Difficult to keep upright; preventing it

from rolling over from side to side

Lots of drag, no water resistance,

boxy and rectangular design

TRADEOFFS

More speed but boat would be too big

Bottle easily attainable but

difficult to keep stable

Very suitable material for boat but lacks aerodynamics

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MODELING OF SYSTEM PERFORMANCE

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INITIAL DESIGN

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DESIGN CONFIGURATIONFor our initial design, we decided to use foam that was 8 centimeters wide and 18.5 centimeters long cut in the shape of a normal boat. Also, we placed place the battery towards the front and motor towards the front-middle of the boat so that the shaft has room to operate. We also cut an area where the motor was placed so that the motor sat i propeller could be submerged into the water. The thickness of the boat itself is 2.5 centimeter.

CIRCUIT IN SERIES

INITIAL PERFORMANCE

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MOTOR

SWITCH

BAT

TER

Y

RED WIRE

BLACK WIRE

TO PROPELLER

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What is the total mass of your electric motorboat and batteries? m= .170 kg

What is the average time it took your boat to race 5 meters? tave= 11.33 s

Calculate the average speed of your boat. vave= .441 m/s

Using ∆d = ½ at2, calculate the average acceleration of your boat. a= .078 m/s2

Calculate the average net force that accelerated your boat forward. F= .013 N

Use the average speed to calculate your boat’s kinetic energy. KE= .017 J

Is the acceleration of your boat constant during a race? Why or why not?

The acceleration of the boat is not constant during a race, This is because of certain factors such as the boat getting caught on the side lip stopping the boat completely or because the boat is constantly rubbing against one side of the track slowing down as it rubs the side then going faster once it frees itself.

What law explains that the force forward on the boat is equal to the force backward on the

__________?Newton’s Third Law of Motion

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Did you wire your circuit in series or parallel? How do you know?

Our circuit is wired in series. We can tell because there is one red wire going to a switch then to the motor and one black wire coming from the motor to the battery.

What was the maximum voltage your motor received? V= 9.15 V

Measure using a multimeter in EAS 199 Lab, the dc resistance of your motor. R= 11.3 Ω

Using Ohm’s Law, calculate the current through the motor. I= .810 A

Calculate the electrical power delivered to the motor. P= 7.409 W

Calculate the total energy delivered to the motor during a 5 m drag race. E= 83.945 J

Compare this electrical energy (E) to the kinetic energy of the boat (KE). Which is greater? Why?

The electrical energy is greater than the kinetic energy of the boat because the circuit is creating work at a constant rate compared to doing work over a certain distance.

Give two ways you could improve your boat’s acceleration (besides increasing battery power).

a. Decrease overall weight of the boat

B. Redistribute the weight so it's more towards the middle and back of the boat

KEY PERFORMANCE METRICS

DESCRIPTION VALUE

1. Best time for vehicle to complete course

11.33 Seconds

2. Weight of the boat .170 Kilograms

3. Voltage of the battery 9.15 Volts

INITIAL PERFORMANCE

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EXPERIMENTAL RESULTS FOR EACH CONFIGURATION TESTED

CONFIGURATION TESTED PERFORMANCE METRICS

m tave vave a F KE V R I P E

PRE-FINAL EXPERIMENT .170

11.33

.441

.078

.013

.017

9.15

11.3

.810

7.409

83.945

FINAL CONFIGURATION .162

10.30

.485

.094

.015

.019

9.18

14.1

.651

5.977

61.561

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SUMMARY OF EXPERIMENTAL SEQUENCES

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SUMMARY LIST OF EXPERIMENTSExperiment 1 - Initial testing; bare shaped base and no modifications with materials given such as full length shaft and first time electrical connections together. Outcome; boat did move, however, in the opposite direction and shaft was hitting bottom of gutterExperiment 2 - Shortened the shaft of the propeller, switched leads on motor, glued the white tube to hull to keep shaft in one position, and added duct tape to outside and underneath to keep foam dry. Outcome; boat was able to move more efficiently and also move in the correct direction, however, boat was front heavy from battery and propeller assembly would come apart causing shaft assembly to disassemble by itself Experiment 3 - Glued propeller assembly to shaft and shaft to rubber tubing that connects motor. Also, glued a hex nut for added weight on back of boat and brought up duct tape past base to protect from water getting into electrical components. Outcome; boat successfully moved without any problems, propeller and shaft assembly stayed intact and weight was evenly distributed throughout design

TWO FACTOR FACTORIAL EXPERIMENT

WEIGHT DISTRIBUTION

FRONT MIDDLE BACK

FRONTFront- Heavy

More weight mid-front

Evenly distributed

MIDDLE Mid-forward heavy

Even but only in one spot

Mid-aft heavy

BACK Evenly distributed

Mid-aft heavy

Back heavy

PERFORMANCE AT FINAL TESTING

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Final performance time: 10.30 SECONDSEFFICIENCY:1. Output relative to power available in circuit: 5.977 WATTS2. Output relative to kinetic energy: .O19 JOULES

ENGINEERING RECOMMENDATIONS

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INTERPRETATION OF RESULTS

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Our design was successful in the aspect that we were able to get our boat to move across the track in a very suitable time.

The boat could improve with the tube leading to the back motor. I noticed the line to the motor curving slightly.

This can attribute to the way in which we can change the model of the boat. For example the minor flaws can easily be fixed.

FUTURE RESEARCH

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Increasing the power of the boat

Using the propeller in the air instead of water or both