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In the most recent podcasts from Paul, he and Alan Booker essentially sent out a call for help from the public to advance the "experiment" with the Willow Feeder (WF) model. A primary concern expressed by Alan was to see if WFs in various climates would produce similar Returns On Investment as have been seen from deposits made at the Willow Candy Warehouse at Wheaton Labs.

I'm not aware of a fully comprehensive resource describing a complete build of a WF, or laying out the various design considerations that present options a builder would want to consider. This ain't exactly Rocket Science, but it would still be good to have a document that approaches the comprehensiveness of ones for RMHs as done by Ianto Evans or the Wisners.

I'd like to maintain this thread as a clearinghouse for questions and answers about the pesky little details that would prevent or stall various efforts to complete and maintain a Willow Feeder operation by inspired Permies. I started planning out a system for my land last year and have a few such issues that are making the process seem like a much more difficult undertaking than it seems it should be.

1) Pressurizing the Candy Chamber
2) Urine diverter destinations
3) ...

Some handy information about the WilloWonka collected by Stephen:
Building dimensions (does not include the added dimensions of the overhanging roof, just the structure):
Length: 7' 1"
Width: 6' (note that the entry door is on one of these walls)
Height, shorter side: 6' 3"
Height, taller side: 9'

Other building details:
Center of one skid to the center of the other skid: 4' 9"
Skid diameter: 9.5"
Door width: 2' 5.25"
Stair height: 6"
Stair depth: 8"
Distance between skids and interior floor: 21"
Distance between the floor and the bench/seat: 18"

Trombe wall dimensions:
Height: 7'
Width: 2' 8.75"
Depth: 13"
COMMENTS:
 
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The greatest hurdle I've had trouble moving past in design thoughts has been how to engineer the negative air pressure in the 'candy chamber'. Obviously it is based around an exhaust pipe extending from the chamber to the exterior of the building. Options used at Wheaton Labs to generate the negative pressure have been battery fans and trombe walls.

The trouble I am having at the conceptual stage is how to create the air tightness in that chamber to allow pressure to build and draw up the exhaust. Can dimensional lumber alone be utilized with tight enough tolerances, or does it require some sort of liner? It seems a rear access door that would be used to cycle the bins in and out would be particularly difficult to construct to form and maintain a seal, such a large, unfixed plane being prone to warping over time.

The other part of this equation is the air intake. Does this need to be strategically placed? Is the gap around the access door the default intake? I would guess that the system would perform best if the exhaust were at one end of the chamber and the intake at the other to ensure flow over and around the bin(s). Would it work to have an air intake from the interior of the feeder to help cycle fresh air into the occupied area?

A related issue is air around the seat access. I recall the WL Feeders have regular seats that have been altered to sit flush with the surface of the candy chamber top such that they form an air seal while in the closed position.
 
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Those are good questions, Coydon. I hope someone is able to answer them soon.

I would like to know where the urine is diverted to? I've seen lots of information about where the willow candy goes and how it is stored. But what kind of container is used for the urine?
 
Coydon Wallham
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Jeremy VanGelder wrote:Those are good questions, Coydon. I hope someone is able to answer them soon.

I would like to know where the urine is diverted to? I've seen lots of information about where the willow candy goes and how it is stored. But what kind of container is used for the urine?


At one point in a visit a couple years ago, I recall Paul mentioning that someone had mistakenly placed a bucket behind the chocolate factory (Willowonka) to collect the urine, and that it was creating a stink. I don't recall the exact authoritative answer he gave, but my take away was that there should be a hose running directly to ground, and I'd assume periodic movement of the end of the hose to prevent build up and chemical burns in one spot.

Also, there are metal pitchers in the feeders for ladies that wish to use the convenience and privacy there and dump the contents later. They leave name tags on the pitcher for reuse, and there is a place for used ones to sit until someone comes to sterilize them.
 
Without subsidies, chem-ag food costs four times more than organic. Or this tiny ad:
Learn Permaculture through a little hard work
https://wheaton-labs.com/bootcamp
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