Rope and WasherRope and WasherHistoryHistory Has been used before, but has never cost $5Has been used before, but has never cost $5 Other areas have struggled with issues surrounding Other areas have struggled with issues surrounding

durability – clients want it to last longerdurability – clients want it to last longer We do not think this will be an issue for IDE MyanmarWe do not think this will be an issue for IDE Myanmar

Potential IssuesPotential Issues The rope stretches – does this matter?The rope stretches – does this matter? Sun deterioration – will farmers be willing to replace Sun deterioration – will farmers be willing to replace

parts during the season?parts during the season? Can we make it foot rather than hand powered?Can we make it foot rather than hand powered? What kind of cheap wheel can we use at the top?What kind of cheap wheel can we use at the top?

Our ProcessOur Process How to make the rope and washer pump cheaper:How to make the rope and washer pump cheaper:

Could we use bamboo for the river pipe?Could we use bamboo for the river pipe?Could we use a soda bottle for the guide pulley?Could we use a soda bottle for the guide pulley?Are there found materials for the main wheel?Are there found materials for the main wheel?Can it be a “rope and rope” pump?Can it be a “rope and rope” pump?

DiaphragmDiaphragm

Plastic PumpPlastic Pump

Thermo Plastic WeldingThermo Plastic Welding Injection MoldingInjection Molding Blow MoldingBlow Molding

High tooling costHigh tooling cost Can’t protoype it from Can’t protoype it from

StanfordStanford Inner bore needs an Inner bore needs an

angleangle

Cheaper than injectionCheaper than injection Imprecise inner Imprecise inner

diameterdiameter

Can Prototype it hereCan Prototype it here Reasonable fixed Reasonable fixed

costs – high variable costs – high variable costs (labor)costs (labor)

Weight of Yellow Plastic Pump (lb) 2.8125

Approx Volume Plastic (cm3) 2240.87

Optimum Plastic Volume (cm3) 1609.64

Volume Fraction (Optimum/ Current) 0.72

Plastic $/ lb $/ original pump matl $/ optimized pump matl

ABS $1.28 $3.60 $2.59

PC $3.00 $8.44 $6.06

PP $1.02 $2.87 $2.06

PVC $3.93 $11.05 $7.93

HDPE $0.68 $1.91 $1.37

Basic EconomicsBasic EconomicsWill the pump get the farmers to the next stage?Will the pump get the farmers to the next stage?

Cost of tube well = $20Cost of tube well = $20 Cost of metal pump = $15Cost of metal pump = $15 Cost of Frame = $10Cost of Frame = $10 Acre of Land = $400Acre of Land = $400

NPV for “one-year” pumpNPV for “one-year” pump

Cost of Pump = $8Cost of Pump = $8

Profit from Crop = $100Profit from Crop = $100One CropOne Crop Two CropsTwo Crops

Cost of Capital (per month) = 10%Cost of Capital (per month) = 10%

Cost of Capital (per month) = 20%Cost of Capital (per month) = 20%

$63.30$63.30

$66.48$66.48$43.23$43.23

$109.95$109.95

Total addressable market size ~ 5 MTotal addressable market size ~ 5 M

Conservatively: 20% of market @ $43 NPVConservatively: 20% of market @ $43 NPV

Social Impact = $43 M !Social Impact = $43 M !

Water Water DisplacementDisplacement

Feasibility – will farmers use it?Feasibility – will farmers use it? User InterfaceUser Interface

Rope and Rope and WasherWasher

Flow RateFlow Rate DegradationDegradation

Diaphragm Diaphragm PumpPump

LiftLift Flow RateFlow Rate

Plastic PumpPlastic Pump Cost Targets (bamboo as substitute?)Cost Targets (bamboo as substitute?) ManufacturabilityManufacturability FramingFraming

Vulnerability – potential pitfallsVulnerability – potential pitfalls

Next StepsNext Steps

Select single design (focus)Select single design (focus) Plastic?Plastic?

Prototype in multiple configurations (go Prototype in multiple configurations (go broad one last time)broad one last time)

DeliverDeliver