48" Mobile Oven Build

[Karangi Dude]

This is how I built my mobile oven

Check the build out at: https://community.fornobravo.com/for...-s-mobile-oven

Cheers Doug

[nuovopizzas]

My mobile oven rolls on and off my trailer on a wheeled trolly. but the mobile oven operators I mentioned both had their ovens permanently mounted on their trailers. If trade looked like being slow then only one oven was kept up to pizza temps. as well as smaller functions being economically catered for.
The stainless flue gallery can be done in a number of ways. Here's one that I recently built, although it's only the top section, the whole gallery including entry can be stainless. Any sheet metal shop would be able to manufacture it.

The stainless steel gallery is definitely something I will look into... what type of insulation would I put around it? Just the normal fire blanket with refractory cement exterior?

[david s]

My mobile oven rolls on and off my trailer on a wheeled trolly. but the mobile oven operators I mentioned both had their ovens permanently mounted on their trailers. If trade looked like being slow then only one oven was kept up to pizza temps. as well as smaller functions being economically catered for.
The stainless flue gallery can be done in a number of ways. Here's one that I recently built, although it's only the top section, the whole gallery including entry can be stainless. Any sheet metal shop would be able to manufacture it.

[nuovopizzas]

A few observations and tips: First up I’m not quite sure how you plan to make a 48” oven from your 42” fibreglass mould.

I have already made the 48" mold. I have a friend who is very experienced with fiberglass help me out with this.

I’ve always believed that two smaller ovens on a trailer are a better option because it’s much more flexible in terms of output, fuel usage (of both the oven and the vehicle to haul it) and floor recharging.

Because this is an enclosed trailer this seems difficult to do... due to size constraints and also seems to be generally heavier. It is a 24' x 8' trailer. This would also make me have to install 2 vent hoods, 2 fire suppressant systems, and for safety regulations, the ovens have to be bolted down so it's not like one oven could be rolled off?? if I am understanding that correctly.

Thank you for the other input I will keep this in mind. The weight limit of the trailer is 7,000 pounds so I feel like I am good in that regard, but its something I need to stay on top of.

Where could I find a custom stainless gallery? I have not heard about this.

[david s]

A few observations and tips: First up I’m not quite sure how you plan to make a 48” oven from your 42” fibreglass mould.
I’ve always believed that two smaller ovens on a trailer are a better option because it’s much more flexible in terms of output, fuel usage (of both the oven and the vehicle to haul it) and floor recharging. Two operators that have such set ups that I’ve spoken to heartily agree.
You should also calculate the weight as the springs on the trailer or vehicle that take the oven need to be matched to the load. Calculate the volume of a sphere ( outer radius and subtract the volume of the inner sphere (inner radius) then divide by 2 as it’s a hemisphere. Add in the weight of the supporting slab, insulation and outer shell, flue and door.
The thinner you make the casting the weaker it becomes.
I have basalt fibres, but the ones I bought have a variety of fibre size and on mixing tend to clump, making even dispersion more difficult than AR glass fibres which are larger and far easier to mix in. Both are expensive, but around the same price.
A custom made stainless gallery is a good option for a mobile oven due to its weight saving.

[nuovopizzas]

Hey Forno Bravo Forums,

I have been lurking on this forum for a couple of years now. Last year I did a backyard 40" Pompeii-style refractory cast build, so I am slightly familiar with the process.

To explain the situation a little bit, I just graduated college and want to start a small business. After building my 40" oven, I put a lot of time into learning how to make good Neapolitan pizza; go figure. Now I want to open a food truck in my hometown (population of around of almost 500,000) that only has one restaurant that offers true Neapolitan pizza. I see an opening in the market.

Anyways, I am looking to build a 48" cast build on an enclosed trailer to make this business plan possible; I need this size so that I can keep production up. I have done research on this forum about builds similar to what I am trying to do, but wanted to run some ideas past the forum, and I will keep the forum updated with my progress and what I learn during this process.

I am casting my dome using a mold I made using fiberglass and a 48" medicine ball. I want to do a one-piece cast, I have heard this is good for damage prevention when on a trailer. I have the means of moving it onto the trailer with a forklift so weight is not a problem.

Next, I want to cast the gallery as well, where I will make a form to cast the gallery. The details and technique I will use to do this is to be determined, I still need to do some reearch and experimentation on how I can execute this properly. This is once again done for the sake of being on a trailer, I do not want mortar joints that are going to "crumbe to bits" as the infamous David would say.

The mix I will be using is a homebrew of fire clay, Portland cement, vermiculite, and sand with silica. What I want to add to the homebrew is either stainless steel needles for reinforcement or basalt fibers I have heard is the new thing to add.

Most of my questions are about the base of the oven, however. Something I need to take into account is weight, I want to minimize weight as much as possible without losing out on oven performance. The way I thought I could do this was by reducing the depth and size of my hearth, but I am not quite sure how the decrease in thermal mass would affect performance. The dome would be about 2 inches thick of refractory cement and then 3 inches of thermal blanket. I would use medium-duty firebricks for the floor and 2 inches of CaSi board beneath. Beneath that, I plan on having the 2-inch hearth. Does anyone foresee problems with this?

Lastly, for the stand, I plan on creating some sort of steel structure to put the heart on. This is something I am not familiar with as well because, in my previous build, I used cinderblocks for the base. But obviously the weight of that is immense.

Any input is greatly appreciated and if anything needs to be explained or drawn out, I can do that. Just trying to get a post out to get the ball rolling.

Thank you everyone for creating such a good resource, without you guys I would have never came across this passion of mine.