I'd like to get one of those for the old svea123 to tame the roar.
wait a minute. price is 100-250? The craftsmanship looks beautiful, BUT.

Preacher wrote on Feb 11^th, 2011 at 6:39pm:

The price range he is quoting is for ONLY the "quietizer cap" (designated as either a dragon tamer or an omnidawg).

I think I'll try crafting my own version.  Did a trial last night with the bottom of a can that had a concaved bottom.  Worked pretty well at a lower setting, but I need to create the interior piece to prevent blow-back at higher fuel rates.  This might be reduced somewhat if I added a few more/larger holes ... I as using a 5/64ths drill bit to punch the holes.

This adaptation may also make a dragon fly a bit more wind tolerant.

dd

BTW:  Svea 123 stoves now go for more like half the price you quoted, if you shop around, but they are also built with lesser quality materials than earlier stoves.

zski wrote on Feb 11^th, 2011 at 7:42pm:

Well, at least I've got a couple of models to look at.  Both the Primus No 5 and the later American made Vesuvius use a similar "technology."  The Primus has an internal baffle, but the Vesuvius does not.

At any rate, one trial result I didn't mention was that the decibels were cut by at least 2/3rds.

Time ... that's what retirement is for!  More time to tinker, more time to plan trips, more time to play with/develop maps.

BTW:  I'm still working on a home grown fire-piston ... something less bulky than the commercial model I have.

dd

Here is an experiment to make the DragonFly stove quiter.

MSR DragonFly Stove (normal configuration with the typical roar):
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Parts borrowed from a Primus 111 stove plus about a 1 inch section of copper tubing inserted down the throat of the left (inside) piece to help focus the jet of fuel from the nozzle.
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MSR DragonFly Stove (with adaptation; normal deflector plate removed an partially visible to lower right).  Comparatively very quiet!
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nctry_Ben wrote on Mar 6^th, 2011 at 3:52am:

I think if you re-read, you'll find that the parts (except for a 1" section of copper tubing) are manufactured parts for the Primus 111 stove. 

Yeah.  You are right ... my tests on creating these parts myself didn't result in the holes all cleanly aligned.  I think I'd need to make a jig to get that level of accuracy.

As for MSR looking into this adaptation, I would think it to be a no-brainer.  The roarer-type burner is a design that is prominent in Primus stoves, so for MSR to use the "flame/sound disperser" would not likely involve any more copyright/patent issues than the burner itself.  Of course, I didn't run my project long enough to determine if there is a fuel efficiency difference or the BTU output is modified, but I would doubt any significant impact.

dd