Matt Goto

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since Mar 04, 2015
Chicago-land Area, Illinois, USA
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Recent posts by Matt Goto

Man!  I wish I were free to do this!  This sounds super awesome!!!

Quick question:
The description doesn't state whether meals will be provided (i.e. included in the cost) or whether they will be extra.  I saw that there will be people that will need to help with prepping the meals, but the description doesn't indicate if this is included in the cost.  Could you please clarify?

Just trying to help make this a huge success!

I just got my DVDs today!  I can't wait to get a chance to sit down and watch them!  I especially like how you shipped them with free fire starting material (aka newspaper) for my first rocket mass heater!  It was very thoughtful!!!  Thanks so much Paul for all that you do!

All the best!
I see in the first post you talk about the theoretical energy stored in wood and say that it doesn't vary that much.

Here are some actual numbers to reference (note the values & units are millions of BTUs/cord of wood - so energy per unit volume):

Osage Orange (Maclura pomifera), 32.9 BTUs
Oak, White (Quercas alba), 29.1 BTUs
Locust, Black (Robinia pseudoacacia), 27.9 BTUs
Ironwood (Ostrya virginiana), 27.9 BTUs
Hickory, Shagbark (Carya ovata), 27.5 BTUs
Apple (Malus domestica), 27.0 BTUs
Honeylocust (Gleditsia triacanthos), 26.7 BTUs
Hickory, Bitternut (Carya cordiformis), 26.7 BTUs
Oak, Bur (Quercus macrocarpa), 26.2 BTUs
Mulberry (Trees from the Moraceae family), 25.8 BTUs

These are taken from this blog post
which reference a "a study done by the University of Nebraska-Lincoln Extension, Institute of Agriculture and Natural Resources. I also consulted a study published by the University of Missouri-Columbia along with various other online resources."

I think the University of Nebraska paper might be:
titled: G88-881 Heating With Wood I. Species Characteristics and Volumes by Mike Kuhns and Tom Schmidt

This paper provides the amount energy stored in the wood (as seen above) but lists many more types of wood than the 10 listed above. It also lists some qualitative properties for each type of wood - such as ease of splitting and how many sparks are produced when burning the wood.

I think the University of Missouri paper might be:
titled: Wood Fuel for Heating by H.E. “Hank” Stelzer

Something that the Missouri paper points out is that "One pound of oven-dry wood of any hardwood species has an available heat value of about 8,600 Btu. Resinous softwood species, such as shortleaf pine, tend to average slightly higher at 9,050 Btu per oven-dry pound." Another interesting tidbit from that paper is "On a volume basis, the heavier air-dried wood is, the more heat it will produce. Therefore, a given volume of the heavyweight woods, such as oak or hickory, will produce more heat than the lightweight ones, such as cottonwood and willow." In other words, if you are looking for a greater amount of heat per volume of wood, take a hardwood, but if you are looking for a greater amount of heat per unit weight of wood, take a softwood.

Anyway, I hope these data points might help some in the discussion.


3 years ago
Hey Art-

Thanks for all the information. I look forward to taking a look at the links. I'm pleased to know that my washer is not going to be harboring any germs after just a few washes.

Thanks again,

P.S. For those interested in more talk on greywater systems with respect to cloth diapers, please see this thread on permies:
3 years ago
Hi Art-
Welcome to the forums! So glad you could make it!

It is my understanding that you have said that water from laundry washing machines can be used as a source for greywater. (Don't you have a DVD out about Laundry to Lawn or something like that?) I further understand that water from tubs and showers can be put into a greywater system. Now both of these are potential sources for removal of feces (e.g. small amounts stuck to human bottom, dirty cloth diapers in which not too long ago I was up to my armpits, etc.). I used to wash soiled cloth diapers in the washing machine. So, I have a few questions for you regarding so called dark greywater, i.e. greywater that has potential to be considered as blackwater.

--At what point does greywater become considered dark greywater? Similarly, at what point does dark greywater become blackwater? I'm curious both from a legal standpoint and from a more practical standpoint. For example, if I were to wash in the tub just after having defecated (but having wiped thoroughly), I would assume that is considered still greywater. Correct? However, if I am going to be washing lots of cloth diapers do I need to consider it blackwater? Are there certain things (e.g. coliform, etc.) that we need to test the water? If so, what concentrations are considered the range for each category? Or perhaps, is it more of a non-precise continuum; you'll know it when you smell it?

--Does contamination of a greywater source last indefinitely if the source of blackwater is removed? For example, in the case of cleaning the dirty cloth diapers in my washing machine, do they permanently contaminate my washing machine or can I safely say that after x number of washing other non-blackwater rated material it would be safe to say it is a greywater source? Would I need to disinfect the washing machine?

Thanks for all your help in understanding these questions (and all the other ones on the forum too)! I am pretty sure that I can safely say that we are all overjoyed to have you out here sharing your knowledge on this matter!
3 years ago
Hi all-
I get a csrf error page ( when clicking on the Rove Beetles link ( in the thread for discussion of podcast 75 ( which Cassie just sent out today in the dailyish email. This link appeared in the email as (

I think that this is caused by number 2. The date is 2015/05/12 at 12:14am central time.

I'm using Firefox version 37.0.2 on Ubuntu 14.04. Please let me know if you need more information in tracking down this bug or if you want me to test something.


P.S. Tried it on Chromium Version 41.0.2272.76 Ubuntu 14.04 (64-bit), but didn't get the CSRF page. Instead, the Rove beetles link took me to the forums webpage ( Hope that helps.

Hey Cassie-
That sounds great. I'm sorry that it is such a hassle for you to set up. Please don't feel rushed. I just saw a message in the other thread that indicated that the emails had already been sent out and thought I had missed something. No worries and please take your time.

And of course, you are right about the streaming WDG videos. I don't know what I was thinking of. I guess I was just tired, it being so late and all.

Happy Easter!

Hi Cassie or Paul or whoever-
First off, let me thank you again for all your hard work and dedication. I really appreciate it. I received emails for the downloads versions of the files (WDG and the old rocket mass heater DVDs) just fine. I was able to download them successfully. I also was able to download the rest of the candy just fine. Thank you for all of this.

However, I haven't received an email about the streaming version of the old rocket mass heater DVDs or the WDG DVDs. I didn't have a vimeo account when I received the email saying that I needed to send a reply with my vimeo account name/number. I made one yesterday morning (April 4th) at about 7am central standard time. I then sent an email to Cassie with my newly created vimeo username at about the same time on April 4th. I checked my spam boxes (since the email address I used for vimeo doesn't match the one for the permies & kickstarter - I hope that doesn't matter) and didn't see any email in either of them. Did I miss something or do something wrong? Let me know if there is additional information I can provide to help resolve this issue.

Please let me know and thanks for you hard work!

Hate to disappoint you Paul. Here's a file listing of the 3 files that I was able to download. The first one is the good version. The next two are the corrupted versions that I was able to download. As you can see from the file sizes, they are smaller than the good one.

-rw-rw-r-- 1 mgoto mgoto 17341647 Mar 26 04:46 rocket-mass-heater-manual-ch04-operation-and-maintenance.pdf
mgoto@mgoto-ThinkPad-T510:~/m/environment/rocket-mass-heaters$ ls -l rocket-mass-heater-manual-corrupt-01.pdf
-rw-rw-r-- 1 mgoto mgoto 17284372 Mar 25 21:06 rocket-mass-heater-manual-corrupt-01.pdf
mgoto@mgoto-ThinkPad-T510:~/m/environment/rocket-mass-heaters$ ls -l rocket-mass-heater-manual-corrupt-02.pdf
-rw-rw-r-- 1 mgoto mgoto 17279992 Mar 25 21:18 rocket-mass-heater-manual-corrupt-02.pdf

This corresponds with what I can tell from using tail (a program that lists the last few lines of a file). The good version ends like other pdf files

/Size 3138
/Root 1 0 R
/Info 2 0 R
/ID [<2E44508332D07E9213DC506EFCFD2F83><2E44508332D07E9213DC506EFCFD2F83>]

The corrupted ones look similar to this:

0001617763 00000 n
0001617869 00000 n
0001618052 00000 n
0001618123 00000 n
0001618229 00000 n
0001618412 00000 n
0001618483 00000 n
0001618589 00000 n
0001618772 00000 n

It seems to me as if the download is getting cut off prematurely. This could be a server problem, a problem with the client that is downloading, or some problem with some part in the middle (maybe a part of the internet caching a corrupted version?). Your suggestion could potentially work though. If there is some pdf reader that could read a corrupted version of the file and then write it out again, that might solve the problem since it would probably write it out with the proper ending. However, it might not since some of the data that is missing might actually be needed to properly read the file.

Of course, having more data from others having problems would be helpful, but I'm guessing that this is what is happening with others as well.

--matt goto
Cassie, et al @,
I'm not sure if this idea has been considered or if it could even be used due to your limited license to offer the download or due to some technical issue. However, have you guys considered using BitTorrent to distribute the files? This is a protocol (and program) that allows distributed hosting/downloading of files. Each computer that downloads the file can be used as a server to share the file with others. This reduces the load on the original server since there are now multiple servers. As permaculturists say, the problem is the solution. As more people download the file, there are more servers to host the file. Also, BitTorrent has checks built into the protocol to ensure each part of the file that has been downloaded was correctly downloaded. This would prevent the problem that people have been having of downloading a file that has been corrupted. Anyway, I thought I'd point it out to you guys just in case it could be an option in the future, maybe even for distributing the candy for the kickstarter. Please PM me, if you need some more information on this.

Good luck everybody and hang in there!