[Stoves] Three (?) Stoves from Rockworks

Tue Feb 19 18:43:26 CST 2013

Crispin and list (maybe) adding Richard Pocock) 

A nice site for this stove is www.rocketworks.org/ (same as Crispin gave last year and below) 

Few questions below 
----- Original Message -----
From: "Crispin Pemberton-Pigott" <crispinpigott at gmail.com> 
To: "Stoves" <stoves at lists.bioenergylists.org> 
Sent: Tuesday, February 19, 2013 3:47:12 PM 
Subject: Re: [Stoves] Three (?) Stoves from Rockworks 

Dear Friends 

An update on at least one version of the stove referred to below. This stove is from a company called Rocket Works though from a technical perspective it is not a classic Rocket stove by several measures. You can draw your own opinion of course. 

[RWL: I'd like to hear your set of differences. I wonder where this f its in the range described by Nordi ca at last ETHOS meeting in terms of dime nsion ratios. ] 

The picture attached was passed around in the public domain so it is OK to talk about it. It is interesting from a couple of perspectives. One is that it produces very little charcoal, meaning it burns the whole fuel. This is different from most Rocket stoves and in ones that have a similar layout but have a grate. Rocket stoves tend to produce charcoal which sits on the bottom of the stove under fuel. I would say this produces about ¼ as much and maintains a high combustion efficiency. 

[RWL: Thi s is first time I have heard this about charcoal and Rockets. Can some users describe the maximum amount they have ever retrieved?] 

The PM emitted on high power (using ≈12% moisture fuel) is similar to that of high end fan stoves like the Oorja burning pellets and the Philip Stove burning chopped wood, territory thought by some to be reserved for stoves with blowers. I am not saying such performance from a side-feeder was unexpected, but it is unexpected that it would be so soon. Clearly they have been playing around with it a lot. The high power PM level would place it at the upper end of Tier 3, right at the edge of Tier 4. 

[RWL: How can I find the full set of data you are reporting here? 

It has some measure of preheating of the primary air and definitely preheated secondary air with a side-feed of stick fuel. From the look of the structure it will not be hot to the touch (most of it) and the cost (and mass) is obviously low. Two of its technical advances are evident in the photos on their website. 

[RWL: T his is the first time I have heard of a rocket having separate primary and secondary a ir supplies. Can you or Richard describe these features some more. Agreed on the nice feature of the w ire mesh. Cost? 

One of the principles is the South African Richard Pocock who we know from solar cooker days. That name may ring a bell with a few of you. Perhaps he will provide some technical and performance details. 

[RWL: I also hope so.] 

Regards 

Crispin 

Date: Tue, 11 Dec 2012 22:06:43 +0800 
Subject: [Stoves] Three (?) Stoves from Rockworks 

Dear Friends of Rocketry 

There are some all-metal Rocket stoves at http://www. rocketworks .org/ featuring a new wrinkle on the under-air pathway. They are made in South Africa. They have a gel fuel insert that makes it a dual fuel stove. 

Performance of both not yet known. 

Regards 

Crispin 

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