Engr305 Appropriate Technology Projects

Below are service learning projects from Engr305 Appropriate Technology, which is a course on appropriate technology at Cal Poly Humboldt taught by instructor Lonny Grafman.

AEF

AEF food dehydrator
A solar dehydrator to help preserve surplus crops
AEF greywater
Greywater system at the CSA, Arcata Educational Farm
AEF informational kiosk
An earthen informational kiosk
AEF photovoltaic system
Modified off-grid photovoltaic system
AEF solar water heater
Improved solar water heating system
AEF spiral herb garden
Restored the existing herb spiral

A-B

Air Ship Air City rooftop greywater filtration
A rooftop greywater filtration system
Aleiha's parabolic solar cooker
Parabolic Solar Cooker
Amal's ethanol still
A valved reflux ethanol still
Arcata Elementary rainwater catchment
A 3000 gallon rainwater catchement system for Arcata Elementary School
Backyard Biodigester
A biodigester converting organic waste to a fuel source
Bayside Park Farm living roof
garden roof to Bayside's new animal hutch
Bayside Park Farm rainwater catchment system
catchment system that collects and stores rainwater for gardening purposes
Bayside Park Farm vermicomposting
vermicomposting for bayside farm to make own compost
Bike Rodeo bicycle blender
A kid's bike blender for Rio Dell Community Resource Center
Bike trailer
A bike trailer from a converted baby stroller
Blue ox earthen oven
Blue Ox earthen oven
Bottoms strawbale earthen plaster
Earthen plaster and natural paint recipes

CCAT

CCAT bike blender 2015
Bike that supplies mechanical power to blender
CCAT bike powered tools
Bike that supplies electricity for power tools
CCAT Clay-straw slip wall
Clay-straw slip wall of CCAT's Greenshed
CCAT clothes drying
Efficient clothes drying system for CCAT
CCAT Cold Box
An energy efficient solution to a refrigerator
CCAT Compost System
CCAT's comprehensive composting system
CCAT DIY solar suitcase
A do-it-yourself solar suitcase from CCAT
CCAT earthbag garden terrace
An earthbag terrace at CCAT
CCAT greenhouse natural wall
An aesthetically pleasing natural earthen wall built by clay and straw slip methods
CCAT greenhouse rainwater catchment
Greenhouse Rainwater Catchment System at CCAT
CCAT greenshed cob wall
Cob wall of CCAT's Greenshed
CCAT greenshed north wall
Cordwood and mortar wall of CCAT's Greenshed
CCAT greenshed solar lighting 2015
CCAT lighting improvement to greenshed
CCAT greenshed west wall
Clay-straw slip wall of CCAT's Greenshed
CCAT greywater 2017
Greywater pump at CCAT
CCAT greywater marsh (2008)
CCAT's Greywater Marsh 2008
CCAT greywater marsh (current)
CCAT Greywater Marsh Continued
CCAT interpretive wind turbine display
Demonstration wind turbine
CCAT's living roof
Replacing CCAT's living roof
CCAT MEOW 2012
Refurbishment of CCAT's Mobile Energy Operation Wagon
CCAT MEOW 2015
Refurbishment of CCAT's Batteries for Mobile Energy system
CCAT MEOW 2019
Pedal bike used for Pedaling for power"
CCAT natural concrete stain
Natural concrete stain
CCAT natural paints 2017
Mural at CCAT using natural paints
CCAT natural paint project
Interior paints from natural ingredients
CCAT natural wall construction
Earthen informational kiosk for CCAT
CCAT outdoor solar heated wash station
A Passive Solar Heated Wash Station at CCAT
CCAT pedal powered grain mill
Pedal powered grain mill for CCAT
CCAT pedal powered TV
Updated version of CCAT pedal powered bicycle
CCAT rainwater catchment system
CCAT's current rainwater catchment system
CCAT rainwater catchment system
Rainwater Catchment System at CCAT
CCAT Raised Garden Beds
Controlled beds of soil above toxic ground
CCAT remediation zone
A stable slope for planting and attracting beneficial insects
CCAT Retaining Wall
Retaining wall for slope erosion at CCAT
CCAT rocket mass cobb bench heater
A Rocket Mass Cobb Bench Heater
CCAT rocket stove
CCAT's improved fuel rocket stove
CCAT Small Pond Revitalization
A small pond with a solar aerator at CCAT
CCAT small rainwater catchment
A Small Rainwater Catchment System at CCAT
CCAT small rainwater catchment
Rainwater catchment for CCAT's cob bench roof
CCAT southside rainwater catchment
A rainwater catchment system for the southside of CCAT
CCAT's Vermicomposting Bin
CCAT's vermicomposting bin
CCAT vertical garden
CCAT's Vertical Garden integration for sustainable plant growing
CCAT yurt roof 2019
A Yurt Roof at CCAT

C-F

Chris's ENGR305 Solar Food Dehydrator
A hybrid, solar food dehydrator
Compressed earth brick press
An exploration of compressed earth bricks
Cooperation Humboldt potato tower
A Vertical Garden Used For Growing Potatoes
Deidre's vertical vegetable garden
Solar powered vertical vegetable garden
Devan's vertical axis wind turbine
Experimental Vertical Axis Wind Turbine
Emily small aquaponic system
micro-aquaponic system to grow personal vegetables/fruit
Engr305 peanut sheller project
Peanut sheller made from clay and newspaper
Engr305 pulser pump
A Labeled Pulser Pump
Engr305 pulser pump
A working model of a Pulser pump
Engr 305 solar learning station
Instructional Solar Learning Station
ENGR305 windbelt
Testing new materials for prototype windbelts
Ethanol from organic sugar beets versus refined cane sugar
Determining the cost inputs and energy outputs of small scale ethanol production

G-O

HCOE bike power classroom
A Bike Powered Blender
HBCSL cobb oven
A cobb oven for the Humboldt Bay Center for Sustainable Living
HBCSL solar shower
A solar shower for the Humboldt Bay Center for Sustainable Living
HSU solar suitcase
A Solar Suitcase
Jefferson Community Center compost
A large composting system for Jefferson School
Jefferson Community Center E305 teach-in
A vermicomposting workshop
Jefferson Community Center edible landscape
Garden Beds in the Edible Landscape
Jefferson Community Center native landscaping 2017
Native Landscaping at the Jefferson Community Center
Kiva's straw bale greenhouse
A straw-bale greenhouse
Loleta Elementary rainwater
Rainwater Catchment System at Loleta Elementary
M Street Eureka rainwater catchment
A rainwater catchment system for residential property
Mattole Community Center rainwater catchment
A rainwater catchment from the roof of the Mattole Valley Community Center in Petrolia
Millcreek greywater
A residential greywater processor
Old Growth Cellar rainwater catchment
A rainwater catchment system for Old Growth Cellars

P-S

Papasan Chair Solar Cooker
A solar cooker and chair when not in use
Parabolic basket and tin can solar cooker
Solar cooker out of local invasive species and waste materials
Plastering CCAT Earthbag Terrace
A sturdy, natural plaster covering to the EarthBag gardening terrace being built in front of CCAT
Rocket stove biomass charcoal
Use of biomass waste charcoal briquettes for rocket stove
Rowan's portable pedal power generator
A pedal power generator
SALIRAJA Yurt Project
A Yurt Roof Composed of Old Cans
Small greenhouse rainwater catchment
A rainwater catchment system for a greenhouse
Solar Charged Lawnmower
An electric lawnmower that utilizes solar power as an energy source
Solar heating box
A passive solar heating box
Stanley and Kristi's eco-friendly carboard furniture
Furniture made from cardboard
Sunbrella
An umbrella in the rain, a solar cooker in the Sun
Sunny Brae Middle School Garden
A garden at Sunny Brae Middle School
Sunny Brae rainwater catchment system
A residential rainwater catchment system

T-Z

Treadmill-a-volt treadmill powered charging
Treadmill power for the Humboldt Bay Center for Sustainable Living
Troubleshooting the AEF photovoltaic system
Troubleshooting, repairing, testing and maintaining a preexisting off-grid photovoltaic system
Tule Fog Farm Grassfed Shed
An indoor space for pigs and goats that also restores a previous brownfield while improving the overall natural landscape
Umbrella solar cooker
A multi-use solar cooker
Wild Chick Farm
A commercial pastured chicken operation in Arcata, California

Page data
Authors	asb59@humboldt.edu, As616, Lonny Grafman, Camille Penny, Drew White
License	CC-BY-SA-3.0
Cite as	asb59@humboldt.edu, As616, Lonny Grafman, Camille Penny, Drew White (2011–2023). "Engr305 Appropriate Technology Projects". Appropedia. Retrieved November 28, 2025.