Sky Huddleston

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since Mar 03, 2016
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transportation gear rocket stoves
Mechanical engineer with a passion for energy and technological advancement. I'm the co-founder of Liberator Rocket Heaters and we're working on a lot of cool projects.
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Recent posts by Sky Huddleston

I'm all for a more efficient and ecologically sustainable society. However, I'm of the opinion that if we really wanted to solve the problem immediately we would build 10,000 molten salt reactors within the year. It would allow humanity to become completely, totally, and utterly carbon neutral to carbon negative in less than a year. Not everyone likes the idea of nuclear power, however its at worse a stop-gap technology that solves the problem immediately and gives us a few thousands years to figure out even better methods of power generation.
1 month ago
We are open to trades, we've even accepted everything from metal coins, trucks, rifles, machines, cryptocurrency, and heads of cattle, so anything works for us so long as its a fair trade.

The usual MSRP for a Rocket Heater with all the accessory's (pellet hopper adapter, outside air intake adapter, and rocket heater) is $1800. However, at the Jamboree we will be more than happy to sell the next generation RMH-2.0 EPA certified rocket heater with the pellet hopper for $1400. The outside air intake adapter is integrated into the design and is no longer a separate component in the new model heaters. The next generation pellet hopper has a lower profile to make loading the heater much easier. This new model heater will also be certified by code to be integrated into thermal mass as an accepted venting method and will boast an insulative ceramic liner on the combustion chamber and riser tube, meaning its a true shippable core that's independently tested, certified, and listed as meeting and complying with the standards outline in UL-1482 and ULC-S627 and EPA certified. This means this heater will be legal to install anywhere in the country and will comply with building codes and insurance policy's.

The location will be at the 2021 RMH Jamboree.
1 month ago
Hello Paul!

This is Sky Huddleston of Liberator Rocket Heaters.

My father and I would be more than happy to purchase two tickets for the full 9 days. With your graces Paul, we would like to make a special debut there for our new EPA approved rocket heater (the first EPA approved and tested to UL standards rocket heater ever) and would love to get feedback for our future third design from you and all the experienced rocket mass heater builders. We will also leave some new EPA approved heaters there for Paul, the Wisners, Donkey, and etc. to test themselves and try to push to failure to get more feedback for further design improvement. We're very close to normalizing the rocket mass heater for the general public, and all the hard work the permaculture community has put into the technology will hit the mainstream.

To anyone that's on the fence about attending the jamboree, DO IT! In addition to all the excellent information offered by the highly experienced rocket mass heater builders, (assuming we get the graces of Paul and the Jamboree team) we are going to be there as well, and we want everyone's feedback and input. Additionally, if any attendee decides to purchase a new EPA approved rocket heater from us at the event, they will receive $400 off the retail price, which is our wholesale price. We want the Jamboree to be as big and great as possible and we want to contribute, share, and learn, and we really look forward to meeting and seeing everyone there.

I look forward to meeting everyone at the Jamboree.
1 month ago
I have some good updates. We will be getting the heater tested to EPA standards within the next year. We have developed a ceramic lined J-tube and are working hard to bring everyone a new EPA approved rocket heater. Thank you all for your support along the way! This journey has taken much longer than it rightfully should have taken.
1 year ago

Colleen Eissens wrote:We really want a rocket mass heater, but living in a home with crawl spaces and basement so looking @ woodburner instead.  After a little preliminary planning/dreaming, decided to check with insurance agent to see requirements to avoid nullifying our fire protection.  He said that woodburner MUST be UL approved and installed per manufacturing instructions and inspected by fire inspector.
So after reading above and hearing the concerns around slow sales, the need for UL approval is a BIG deal for increasing sales.  My guess is that getting that approval rating is why the Kimberly(drooling....) or the Katydid fuel gasifiers cost $4000 , add up to a grand for installation extras.  They have made this a luxury item, basically, marketed toward the mariner crowd, but its the only rocket stove that has gotten the approval.
Any ideas as to how they achieved that could be very useful in proceeding.
A go fund me page is awesome idea, if that's what's holding this product back.
New to forum, apologies if this is rehashed info/ideas.



Insurance company's, when they say "UL approval" they mean tested and approved to UL standards by a third party lab accredited by ISO. Which we already are. We comply with any insurance policy's that permit wood stove's.

A common misconception is that UL is a government agency. They're not and they are no better as far as building codes and insurance is concerned than any other testing lab. Many company's that make wood stoves (including ours) have opted to not get it tested by UL but instead one of their competitors due to the huge cost difference. Again, as far as building codes and insurance company's are concerned there is no difference. US Stove Company, Hearthstone, Drolet,  Vermont Castings, Jotul, and many others are starting to use testing labs such as Intertek, Warnock Hersey, Omni-test, Spectrum Labs, Guardian, and many others.

UL is not a monopoly. Their listing is no better as far as insurance company's are concerned than any other ISO certified testing lab.

So to sum it up, yes, we already meet ALL building code and insurance standards for safety. That is a fact and I stand by that statement. If your insurance company has a problem with it tell them to contact me and I will show them mountains of paperwork, testing reports, approval by certified boards of engineers, and much more. Thus far I've never had to do that and I doubt I ever will.
3 years ago

John C Daley wrote:How is this project coming along now?



We're still trying to get the funds together to get it EPA Approved and Certified. We have been experimenting with refractory coatings and we're coming close to finding the right technology which will allow the heaters to without any doubt at all from anyone last indefinitely.
3 years ago

Rob Yost wrote:Hi Sky, I am very interested in installing one of your stoves. A couple of questions, do you foresee any problems burning mostly cedar?  I have access to lots of fallen, dried cedar, I am mostly worried about sparks coming out the feed tube and creosote build up.

Second, have you or anyone else played around with phase change materials (PCM) as an alternative to thermal mass?  My thoughts are to build a large steel pot to put on top of the heat riser with PCM materials inside. See http://www.pcmproducts.net/High_Temperature_Salt_PCMs.htm for details. My goal would be to light it twice a day and keep the house comfortable.

Lastly, have you shipped any systems to Canada, and if so, what are the approximate shipping costs?

Thanks for your dedication to clean and sustainable heating!



The heater burns cedar and other softwoods like a champ. We find it burns just as good if not better with softwoods than hardwoods.

PCM's are expensive and we might look into it for our up coming hyper-model (still in the conceptual/screening phase) but thats a LONG ways off.
3 years ago

jonathan kedzierski wrote:

Glenn Herbert wrote:It is 1" thick, and the riser sections the thread discusses are 6" ID and 24" long. This thickness of this material is generally considered sufficient by itself for heat riser insulation.

I think the thread gives enough information for you to contact the manufacturer for detailed specs.

I believe I read that the vacuum formed ceramic heat risers were 2" thick, so a 6" ID would be 8" OD.



If its 6" ID and 8" OD then its one inch thick.
3 years ago

Glenn Herbert wrote:It is 1" thick, and the riser sections the thread discusses are 6" ID and 24" long. This thickness of this material is generally considered sufficient by itself for heat riser insulation.



I'm more interested in the R-value of the insulation, specifically btu-in/hr-F-ft^2 as I have a source for high strength 3300 F. rated cast refractory's that have a thermal conductivity value of about 6 btu-in/hr-F-ft^2
3 years ago

Glenn Herbert wrote:First off, I'm glad you are doing well enough with your initial model to keep the business going. The more variety in available approaches, the better, and if someone can get a manufactured version when they would otherwise not be able or allowed to build their own, that just spreads the awareness of the technology.

I don't have a more informed opinion than anyone else on minimum refractory thickness, but I think a round riser would be more durable, and probably a bit more efficient. Also, it would obviously require less material for a given system size - not an unimportant point when making them commercially. I don't think you would actually need a really heavy outer shell for the riser, as that region after the combustion zone has historically been demonstrated to have conditions not conducive to corrosion.

A 6" size would likely be easier to make as a shippable unit, and small enough to more easily find installation locations. I might consider a 6" batch box, as that is supposed to have the heating power of an 8" J-tube, so could power a larger system while keeping the smaller combustion unit size. What are you thinking with regard to connecting your units to owner-supplied mass storage? I would think there could be a way for your manufactured and listed product to have thermal mass put next to or around the exhaust without voiding the listing... is this true? If the unit you test and sell is designed to shed enough heat in itself that your exhaust could safely go up the chimney even if someone foolishly insulated the duct run (!), any kind of thermal mass would not negatively impact the assembly's safety.

A catalytic combustor would be irrelevant to a properly functioning RMH, so I don't see any advantage to including that kind of thing. I would even consider a sales point like "total efficiency and pollution reduction without a catalytic unit to worry about".

There is a thread here about inexpensive ceramic fiber heat risers, and that might be a technology for you to look at; it would reduce shipping weight, not require as much protection from shipping damage/cracking, and contain the insulation in a slender package, which could probably be fitted inside a metal shell for shipping and moving safety.



I wonder what the insulation value of that ceramic fiber is and how thick it is.
3 years ago