G K t E i i P j tGo-Kart Engineering Project

fTeam of 13 students

Electric, Plug in, Go-Kart Project

Team deadline for completed project: March 31,2010

O iOverview

ObjectivesThe TeamResearchSurvey Information

Obj tiObjectives

B ild l t i k t th t Build an electric go-kart that can plug right into a 120 V AC current outletoutletHave the ability to go 30 MphHave the vehicle safe to driveHave the vehicle safe to driveDesigned to fit a 6ft 6in 300 pound personpFundraise to earn $2,500 to aid in the completion of the go-kart

Th TThe Team

Top: Amanda, Eric, Jarred, Cory, Domeniko, Dan

Bottom: Ale, Ryan, Anthony, Colin, John

R hResearch

Batteries and charging systemsMotorsMotor ControllersFrames/suspensionSafety features

B tt i d h i tBatteries and charging systems

We are looking at48 volt batteries to reduce the current drawdraw.40-50 Ah capacity for approximately an hour or more battery life based off a 2 hour or more battery life based off a 2 horsepower motor.An approximated 3 hour charging time.

Battery Study for Different Storage Options

Closer study, comparing the lifecycle cost of Sealed Lead Acid Batteries and the lifecycle cost of LiFePO4Batteries, and the lifecycle cost of LiFePO4

B tt A l iBattery Analysis

We had narrowed down our choices to between Sealed Lead Acid and Lithium Iron BatteriesLithium Iron Batteries.Currently, the best battery option is the Sealed Lead Acid battery and the Sealed Lead Acid battery, and we are researching the various pricesprices.

M tMotors

Used calculators to get an estimated motor power requirement1 Hp=746 WThe values we used in the

l l i d bcalculators we estimated to be higher than the real life values.

Calculator Estimate of Power Requirements at 5-45 MPH

Source: http://ecomodder.com/forum/tool-aero-rolling-resistance.php?Weight=700&WeightUnits=lbs&CRR=.01&Cd=.30&FrontalArea=10&FrontalAreaUnits=ft^2&FuelWh=33557&IceEfficiency=.75&DrivetrainEfficiency=.95&ParasiticOverhead=0&rho=ciency .75&DrivetrainEfficiency .95&ParasiticOverhead 0&rho1.22&FromToStep=5-120-5

M t A l iMotor Analysis

fFrom that data we find a 2 HP Motor would be sufficient to maintain our speed at 30MPH speed at 30MPH We are currently contacting local companies to find a second opinion companies to find a second opinion on our motor need.Additional analysis was done using:Additional analysis was done using:http://buggies.builtforfun.co.uk/Calculator/analyse metric phpulator/analyse-metric.php

Additi l A l iAdditional Analysis

T d t i i d f To determine power required for acceleration we preformed our own calculations:

lFP

**

==

τωτ

radradrotationinftMi

NsinmphmkgamFs

4922112528030

5.284)15__300(894.*318* 2 =−==

π

NmtireradiusinmNsrad

rotationrad

rinrotation

ftin

Mift

HrMi

3.41)__7.5(145.*5.284

4.922*)(7.5**2

_1*12*5280*30

==

==

τ

ππ

ω

wattssradNmP 38164.92*3.41 ==

F d S iFrame and Suspension

fMaterials in consideration for the frame:

St i l St lStainless SteelStrong and durableResistant to wearResistant to wear

AluminumInexpensivepLightweight

Possible Suspension Ideas:Independent rear-suspension

S f tSafety

Will include:SeatbeltKill i hKill switch

Under consideration:llRoll cage

AirbagsSpeed limiterSpeed limiter

S I f tiSurvey Information

Population size: 36Ages 16-18Wanted some potential customer opinion to influence our designNeeded to know what was most important to customers.C t tti i l t i t t Cost cutting in least important areas

S I f ti C ti dSurvey Information Continued

Average height: 5ft 8in80% wanted go kart to be close to h d h lthe ground – 4 inch clearance

70% wanted brake and gas pedal l d don single side, as opposed to

separated.65% b li i i f i l 65% believes suspension is fairly important (7+ on a 10 point scale)

In ConclusionIn Conclusion

O b lOur objective is to construct an electric, plug-in go-kart that can go 30 mph and carry an 6ft 6in personcarry an 6ft 6in person.We are currently researching many different aspects of the go-kart, such as p g ,batteries, motors, and safety features.