tag:blogger.com,1999:blog-401164737462963207.post8529564679054083652..comments2024-03-28T00:14:10.834-07:00Comments on Ben Krasnow: Hybrid rocket engine with acrylic and gaseous oxygenBen Krasnowhttp://www.blogger.com/profile/04234629396863486242noreply@blogger.comBlogger10125tag:blogger.com,1999:blog-401164737462963207.post-90775530253995599782020-10-29T09:53:51.025-07:002020-10-29T09:53:51.025-07:00the vid was realy cool, i think i might make an am...the vid was realy cool, i think i might make an amature rocket with this vidAnonymoushttps://www.blogger.com/profile/10562070832208642803noreply@blogger.comtag:blogger.com,1999:blog-401164737462963207.post-85270625366749951992012-09-29T19:24:49.946-07:002012-09-29T19:24:49.946-07:00Very nice! Ever thought of doing fusion. If you ar...Very nice! Ever thought of doing fusion. If you are interested, try fusor.net. Keep up the good work.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-401164737462963207.post-18175986275142651722012-09-25T21:37:11.827-07:002012-09-25T21:37:11.827-07:00Looking at the video more closely, I think I can s...Looking at the video more closely, I think I can see a few brief bursts of choked flow, where the exhaust narrows down and the noise increases.Norman Yarvinhttp://yarchive.net/blog/noreply@blogger.comtag:blogger.com,1999:blog-401164737462963207.post-85816300351204014412012-09-25T18:54:37.255-07:002012-09-25T18:54:37.255-07:00that is awesome... that is awesome... Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-401164737462963207.post-73794198703396547982012-09-25T08:32:45.159-07:002012-09-25T08:32:45.159-07:00Saw your video on dump.com -- awesome stuff!
Very...Saw your video on dump.com -- awesome stuff!<br /><br />Very cool tidbit I took from a nasa video, they channel liquid oxygen along the inside of the nozzle to use evaporative cooling to prevent the nozzle from liquifying at several thousand degrees. Perhaps some sort of liquid cooling on your tailstock aluminum nozzle mount (run liquid o2 through the alum to make it gaseous for reinjection at the top = cool the aluminum and get high pressure from low volume liquid o2.<br /><br />Again, very cool stuff!<br /><br />@anonymous first comment; oxygen doesn't burn. unless you ignite the metal oxygen feed tube, there is no fuel in that hose to burn, only oxygen, and oxygen doesn't oxidize itself :PJamie Frosthttps://www.blogger.com/profile/08429589850175790748noreply@blogger.comtag:blogger.com,1999:blog-401164737462963207.post-2553924272067780372012-09-24T19:07:39.692-07:002012-09-24T19:07:39.692-07:00Are you actually getting choked flow there? I don...Are you actually getting choked flow there? I don't see any Mach diamonds.<br /><br />Armadillo had a good video, a while back, of what the transition to choked flow looks like (and sounds like):<br /><br />http://media.armadilloaerospace.com/2004_09_05/GOX-GH2test.mpg<br />Norman Yarvinhttp://yarchive.net/blog/noreply@blogger.comtag:blogger.com,1999:blog-401164737462963207.post-81561387159805056062012-09-24T15:29:47.670-07:002012-09-24T15:29:47.670-07:00Echoing Kenneth. That deserves a correction.
Ver...Echoing Kenneth. That deserves a correction.<br /><br />Very small nitpicks aside, this is a very neat educational tool and absolutely deserves the attention it's getting (I've already seen it on Universe Today). Maybe you should see if you can get some Schlieren photography of the interior burn dynamics :)Erinhttp://hyperbuddha.netnoreply@blogger.comtag:blogger.com,1999:blog-401164737462963207.post-30398475828041971792012-09-24T11:20:41.619-07:002012-09-24T11:20:41.619-07:00Just wanted to say that you make really great vide...Just wanted to say that you make really great videos! I can't believe I didn't notice your Youtube-channel before.<br /><br />Do you have any plans of making a rocket and launch it?Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-401164737462963207.post-12447194319678988362012-09-24T10:09:34.948-07:002012-09-24T10:09:34.948-07:00Convergent/divergent nozzles are because a converg...Convergent/divergent nozzles are because a convergent nozzle can only accelerate a flow to sonic speed (which makes sense, if you consider that back pressure can't propagate forward faster than the speed of sound). Weirdly, once a flow becomes sonic, to speed it up more, you use a divergent nozzle.Kenneth Finneganhttps://www.blogger.com/profile/09597995268728038585noreply@blogger.comtag:blogger.com,1999:blog-401164737462963207.post-88077051409330920962012-09-24T02:16:14.077-07:002012-09-24T02:16:14.077-07:00hum, any chance the oxygen feeding tube would star...hum, any chance the oxygen feeding tube would start burning from the inside, when the pressure is lowered but not completely shut ?Anonymousnoreply@blogger.com