Greetings,[edit | edit source]
I am an Appropriate Technology educator involved with designing class projects for undergraduate engineering students; producing unique prototypes that are then presented as public demonstrations on the campuses of education centers, universities, as well as alternative energy fairs and concert events. I seek to produce an educational Appropriate Technology display that demonstrates a permaculture concept known as Stacked-Functions; the idea that a tool or accessory should have more than one essential purpose in order to reduce the environmental costs and personal expense incurred through the prevalent use of single purposed possessions. The focus of this project is to design a prototype worthy of symbolizing this concept and capable of taking its place upon world stage.
I believe the shape of this prototype should be able to assume that of a paraboloid; a precise, radial, 3 dimensional manifestation of the 2-dimensional parabola; with focusing properties first mathematically-conceived and proven by Diocles in 256 BC and physically demonstrated by his student, Archimedes in 212 BC ...
And ... while not officially deemed an immaculate-conception, its useful properties of optical and structural engineering make possible a myriad of stacked functions; each so profound and essential in its own right, as to be deemed miraculous if witnessed long before its time. From the quest for fire to the burning-mirrors of ancient Greece, from the woven basket to the ceramic bowl, from the wood fired kiln to the Odeillo Solar Furnace, from an aboriginal hut to the first dome tent, from the wheel to the nose cone of a jet airliner, from a telecommunication satellite dish to a radio telescope, the Hubble Space Telescope Mirror, and Beyond! All of these possible functions reside implicitly within but one shape ... the paraboloid. 
(A brief technical math discussion follows - skip ahead one paragraph if you wish.)
A parabola is graphed by using the general equation y = ax^2. + 2ab + b^2, (which for our purposes can be simplified to y = a x^2 ). By varying the value of the coefficient ( a ) from 0 to 1, the depth of the parabola will vary from that of a shallow plate to that of a dome, respectively; depending upon its intended application. For example: when (a) = 0.9 our equation becomes y = (.9) x^2 which precisely describes the shape of many useful items including: a deep focus parabolic solar oven, a blizzard-snow-shelter dome, an emergency search light beam reflector, or an aerodynamic nose-cone shape suitable for deflecting projectiles. (see fig. 1 above) . By comparison, in the equation that describes the slight curvature of the Hubble space telescope parabolic mirror, ( a ) approaches O and thus the mirror has an extremely shallow depth enabling it to focus on distant galaxies nearly 13 billion light years away. (1 light year equals approximately 6 trillion miles.)
But, rather than designing from scratch, I believe a simpler approach for introducing this concept to the general public would be to choose a common household item that already has design potential. And, with that goal in mind, consider if you will ...
the umbrella[edit | edit source]
When a fiberglass framed umbrella is opened, the ribs are flexed into a shape determined by the shape of the canopy. A paraboloidal shape for the umbrella canopy can be approximated by calculating the correct dimensions to which the triangular shaped facets are cut and sewn together at the edges. Preliminary research has shown that when the concave facets are surfaced with light weight mirror finished materials, some wedding umbrellas approximate a parabolic curve well enough to function as solar ovens; just able to bake a cake at 300 degrees f.
Appropriate Technology Engineering Class Project
Cal Poly Humboldt 2009
However, the recent availability of low cost, light weight, parabolic photographic portrait lighting-umbrellas has made possible the more recent testing of a larger umbrella solar oven prototype that reached an oven chamber temperature of 330 degrees f. and baked cookies during its first tests. The reflective canopy remains at whatever the ambient temperature happens be.
Umbrellas are already commonly accepted as a necessity that many people are accustomed to using in their daily lives; whether for rain or shine.
In fact, umbrellas are ubiquitous and even used as symbols of mass protest.
The Umbrella Rebellion - Hong Kong
Historic Note: 1/16/2018 China - Pro-democracy activist Joshua Wong has been sentenced to three months in prison for his role in organizing the 2014 “Umbrella Movement” protests in Hong Kong. This is Joshua Wong, speaking before his sentencing Wednesday.
“They can lock up our body, but they can’t lock up our mind. What we hope to do is, even if we need to face a prison sentencing, we will still continue to fight for democracy in the future. Thank you.” - Joshua Wong
2/8/2018: Hong Kong’s highest court has thrown out the prison sentences for three pro-democracy student organizers: Joshua Wong, Alex Chow and Nathan Law. Tuesday’s ruling reverses the August 2017 verdicts in which the three were sentenced to months in prison for helping organize the 2014 pro-democracy “Umbrella Movement” protests.
Women's Rights Demonstration - Warsaw, Poland
I challenge the umbrella industry to develop a multi-functional parabolic umbrella prototype, with the following list of features:
• a quick-shelter umbrella-tent-space that reflects IR radiation (body heat rays) back inside the tent like a space blanket
• an umbrella satellite dish for establishing emergency telecommunications and Internet up links for news, and information, etc
• a photovoltaic umbrella canopy fabric surface capable of recharging AA batteries stored within the umbrella pole and used for powering night lights, charging cell phones, and digital cameras, etc. once photovoltaic fabric is perfected. Amorphous photovoltaic coatings such as printer ink are being developed at Iowa State University. Bucky-tube fabric hybridization is another promising method now on the horizon.
• a sturdy, overbuilt fiberglass umbrella frame that is both impact resistant and storm worthy with a canopy of durable rip-stop fabric that is UV and flame resistant
• an umbrella solar cooker/solar thermal water pasteurizer
• a rain water catchment/with collection drain
• a self defense shield against batons & projectiles etc.
• an emergency flood lamp reflector
• a protective umbrella carrier with gig bag: tubular, impact resistant, reflective, air tight so it can function as both a buoyant flotation device and easy to aim cylindrical signal mirror while keeping one afloat / gig bag outside pockets stocked with compass, maps, cell phone, first aid kit, and a 1 liter water bottle ... etc
- components made using sustainable/bio-compatible materials when possible
- Lifetime Warranty
- free overnight airdrop delivery (available upon request)
Such a multi-functional umbrella could take the place of several other separate single purposed accessories, if its single retail price is less expensive, thus providing an incentive and means towards reducing the number of one's most needed possessions and decreasing one's own environmental impact upon the Earth.
And last, but not least ...[edit | edit source]
The world wide proliferation of such umbrellas would pre-position them for emergency deployment to meet the most immediate and essential needs
of a population that suddenly finds themselves displaced as refugees; caught up in a war, ethnic cleansing, or natural disaster. Thus, the umbrella
could come to be viewed as a symbol; embodying all the compassion and concern of the Special Envoy of the United Nations High Commissioner
On Refugees, Angelina Joli, the appropriate technology ethos of Buckminster Fuller, and yes ... the helpful spirit of Mary Poppins.
And Now ...[edit | edit source]
To access if the previously mentioned check list of multiple umbrella functions would be applicable and sufficient to help provide for the most essential needs of people in such a catastrophe, a closer look at a day in the life of a war refugee could provide a heart felt appreciation of the ordeals currently being faced by human populations displaced by a wars ... now being waged.
The following video chronicles the ordeals faced by just such a displaced population. Throughout the video, Green Umbrella icons will appear from time to time near the top of the screen to point out critical situations taking place, that create an essential need, which could potentially be met by just such a multi-functional parabolic umbrella.
(This video file is stored on Google Drive which sometimes loads to slowly for the video to play without frequently pausing to buffer. To get around this, simply click on the link, allow the video window to open and then wait 20 minutes for it to automatically pre-load before click-starting the video. You may download the video by clicking on the arrow shaped icon located in the upper right portion of the video window.)
Appropriate Technology Engineering Class Projects
See also[edit | edit source]
- Projects with Bart
[edit | edit source]