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"Rocket-Grill" AKA rocket stove bbq

 
Fred Walter
Posts: 43
Location: Near Beaver Valley, Ontario, Canada
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Here is something interesting, a rocket stove bbq with lots of instructions:

http://www.instructables.com/id/Rocket-Grill
and
http://ecorenovator.org/forum/biofuels/1052-building-rocket-stove.html

He used 6.5" diameter steel pipe for the feed tube and burn tube, and didn't insulate it.

Anyone know enough to say what would happen if someone used 4" diameter steel tube (well casing)?

I'm assuming if the burn tube was insulated, that the bbq would be more efficient, but would the cooking temperature go up (perhaps too much)?
 
Len Ovens
pollinator
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Posts: 1426
Location: Vancouver Island
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FredWalter wrote:
Here is something interesting, a rocket stove bbq with lots of instructions:

Anyone know enough to say what would happen if someone used 4" diameter steel tube (well casing)?

4in. should be fine for this use... too small for a RMH though.


I'm assuming if the burn tube was insulated, that the bbq would be more efficient, but would the cooking temperature go up (perhaps too much)?


My main concern is there doesn't seem to be a heat spreader or reradiator. The idea of a bbq is to broil, from what I saw, the heat goes straight up the middle as hot gas. It would work fine for his dutch oven as that would spread the heat around the outside of the pot. It would probably make a great mini oven for one loaf at a time... not so sure about BBQ though. A tray with lava rock might help or a cast iron fry pan (with no handle) about the same diam. as the bbq (enough smaller so the gasses can pass around it) set an inch or so off the bottom might work too. Most propane BBQs have a "flame spreader". I think this needs one too. Even a few fire bricks or some soapstone.... a pizza "stone" the right diam... if it lasted.
 
Fred Walter
Posts: 43
Location: Near Beaver Valley, Ontario, Canada
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As an alternative to using round tubing, can one use square or rectangular tubing without losing efficiency/etc?

The cuts would be a lot simpler for the feed-tube-burn-tube connection with rectangular or square tubing.

My main concern is there doesn't seem to be a heat spreader or reradiator.


In "Step 7: Odds and Ends" he has a section for his heat diffuser, which is only put in when he is grilling.
 
Brice Moss
Posts: 700
Location: rainier OR
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this is a design I should definitely imitate.
thank you for posting it
 
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