Reynst pot help

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sockmonkey
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Re: Reynst pot help

Post by sockmonkey » Mon May 16, 2016 5:24 pm

Say you made the "bottom" of the combustion chamber double-walled to serve as a preheating chamber for the fuel with pinholes in the inner wall to let it into the chamber.
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Fileeraus
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Re: Reynst pot help

Post by Fileeraus » Sun Jul 10, 2016 8:03 pm

Been busy a lot but I just got the pipe straight and there's no lip inside the 2,5cm pipe and it runs like this:
https://www.youtube.com/watch?v=nXAs9tYJQPg
When its standing straight it always does 2-3 pulses and then shuts, same on 45 degree angle and further. On sideways it runs for whole 3 seconds. I'll go get some more tanks and try to find smaller ones that I have right now and try to mess with them.
Should I increase the pipe width just a little bit, say 0.1cm?

Mark
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Re: Reynst pot help

Post by Mark » Sun Jul 10, 2016 11:55 pm

You could try cutting the length of the snorkel a little at a time until it runs longer. Somewhere there is the right length for that snorkel I should think.
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Fileeraus
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Re: Reynst pot help

Post by Fileeraus » Mon Jul 11, 2016 12:03 am

OK, when I've cut the pipe a little more I don't have more of it :| Tomorrow is the day 8)

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Re: Reynst pot help

Post by Fileeraus » Wed Jul 13, 2016 3:38 pm

Still not working, I've cut the pipe just a little by little, have tried different amounts of fuel and different angles every time and still not having a combustion that would last longer than 3 seconds.

Mark
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Re: Reynst pot help

Post by Mark » Thu Jul 14, 2016 12:22 am

It may be that the tank is too long for the tank width but it's hard to tell without a clear straight on sideways photo of the entire device, a photo not taken at an angle such as looking down on it. My scuba tank and some small 9 ounce paintball tanks that are very long and narrow don't like to run nearly as good as other shapes, maybe they don't scavenge the air as well or the swirl/mixing is weakened. But I hope you don't give up.
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Fileeraus
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Re: Reynst pot help

Post by Fileeraus » Thu Jul 14, 2016 9:09 pm

Filmed some videos https://www.youtube.com/watch?v=7PP7W_UX1xM

Spirits as fuel were more promising. Forgot to measure the jet, I'll do it tomorrow 8)

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Re: Reynst pot help

Post by Mark » Fri Jul 15, 2016 1:36 am

I would try to shorten the snorkel to about 20 to 25 centimeters - just guessing the snorkel now looks about 30 centimeters. Shorter snorkels are usually less fussy. You've certainly given it enough tests at that length. It helps to have enough fuel in the bottom of the tank too, enough surface area to evaporate fast enough to sustain things. Sometimes that makes a difference. Anyway gradually shortening the snorkel might allow it to sustain. I've had this happen to me on numerous occasions, the exact same start and die behavior.
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Fileeraus
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Re: Reynst pot help

Post by Fileeraus » Fri Jul 15, 2016 2:40 pm

Ok the snorkeler is 40cm tall and 15cm wide with a 20cm pipe on top. Today I cut the pipe to the 20cm and it was even more promising! I'll do more tests tomorrow 8)

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Re: Reynst pot help

Post by Fileeraus » Tue Jul 19, 2016 5:42 pm

Results are still the same, not combusting with the 20cm pipe. :(

Fun thing: Found out that they sell methanol in snorkeler jets :lol:
http://i.imgur.com/zVw8won.jpg

Mark
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Re: Reynst pot help

Post by Mark » Wed Jul 20, 2016 2:12 am

"Made of highly denatured absolute ethanol." ???
https://www.prisma.fi/fi/prisma/masinol ... aaine-05-l
http://www.ffp.fi/bb/viewtopic.php?t=69025

This is another shape like your plastic bottle that caught my eye, it's a 32 ounce/946 ml bottle with a lot of confinement for the snorkel diameter.
http://www.walmart.com/ip/Louisiana-Ori ... z/10290894
https://www.thriftcat.org/upc/017600021 ... t-sauce-32
This one you could probably put a metal tube in the neck to reduce the diameter to have it run for a few seconds snorkel speed/snorkel loud. I've seen lots of narrow neck olive oil bottles but the bottles aren't wide enough even though they have a long, long, neck.
http://fresh-zone.com/489/colavita-extr ... bottle.jpg
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Fileeraus
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Re: Reynst pot help

Post by Fileeraus » Wed Jul 20, 2016 8:00 pm

Mark wrote:"Made of highly denatured absolute ethanol." ???
Glad I didn't buy it, found it from our garage haha

This snorkeler will receive a lot less attention from now on because I'm building my first proper pulse jet, a thermojet :P

Fileeraus
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Re: Reynst pot help

Post by Fileeraus » Tue Jul 26, 2016 3:49 pm

OK the thermojet will wait a couple years so more testing:
https://www.youtube.com/watch?v=THgFBJk6mNY
I cut the pipe just slightly more and it almost sustains. :D

Mark
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Re: Reynst pot help

Post by Mark » Tue Jul 26, 2016 4:41 pm

That one try around the 13 second mark sounded promising. How much methanol are you putting in the tank on these attempts and are you for certain your methanol is 100% methanol? What source are you getting the methanol from? I've had my piglet snorkelers be fussy on occasion and I just had to wait for better weather. Often if the air is humid or too warm they start and die just like yours. A shorter snorkel will surely run but it's more interesting to have an engine run as energetically as possible.
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Re: Reynst pot help

Post by Fileeraus » Tue Jul 26, 2016 7:39 pm

I've had 1 liter of meths in it and I'm pretty sure that its 100%. Getting it run is the #1 so I'll just cut a bit more of it and test more tomorrow :D

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