Search found 10 matches

by Röör
Mon Feb 08, 2016 7:23 pm
Forum: Pulse detonation engine forum
Topic: Some noob ideas for initiator
Replies: 1
Views: 1034

Some noob ideas for initiator

Hi, As I was just going though the forum, I had now a look at these PDEs, which I never have done before. Interesting concept, but as it seems unfortunately quite a small amount of info out there... As I got it, there are several concepts. One of them being basically a double chamber setup, where th...
by Röör
Thu Feb 04, 2016 6:19 pm
Forum: Ramjet forum
Topic: Some Basic Questions Regarding Ramjets
Replies: 0
Views: 1439

Some Basic Questions Regarding Ramjets

Hi As the topic emerged again, I would like to try building some "flat" ramjets as discussed in another topic. But a few questions emerged, which are actually basic questions relating to ramjets, where I couldn't really find any answers. Maybe some of you people can help on these questions. Position...
by Röör
Fri Nov 28, 2014 5:50 pm
Forum: Ramjet forum
Topic: "Flat" Ramjets as in Fleissners Patent, feasability?
Replies: 15
Views: 7822

Re: "Flat" Ramjets as in Fleissners Patent, feasability?

Most people make this thinking error, when they think just by rotation you get a high compression. The problem is the "m". Air has a very small mass. Therefore if you calculate it, the compression will be small. You have to think of the air in e.g. a rotating drum like a column to the center. And th...
by Röör
Tue Nov 25, 2014 11:55 am
Forum: Ramjet forum
Topic: "Flat" Ramjets as in Fleissners Patent, feasability?
Replies: 15
Views: 7822

Re: "Flat" Ramjets as in Fleissners Patent, feasability?

I don't think this would make much sense, as the compression due to the centrifugal force is very small. This is because air has a very low density as e.g. compared to a liquid. Probably also drag losses would be quite big. Then you would have to rather do it, like in a typical radial compressor, bu...
by Röör
Sun Aug 03, 2014 10:00 am
Forum: Ramjet forum
Topic: "Flat" Ramjets as in Fleissners Patent, feasability?
Replies: 15
Views: 7822

Re: "Flat" Ramjets as in Fleissners Patent, feasability?

Didn't look at this thread since quite some time now. But the idea emerged again. And now I'm quite curious and would like to make a little Flat-Ramjet. Maybe similar like this: flat ramjet.jpg I think one advantage would certainly be, that a flat Ramjet is much much easier to construct. I think I w...
by Röör
Thu May 27, 2010 9:21 am
Forum: Valved pulsejet forum
Topic: Tesla-Turbine Pulse-Jet Hybrid Engine
Replies: 0
Views: 2627

Tesla-Turbine Pulse-Jet Hybrid Engine

Hi, As I floated around the net about Bernoulli's Principle, I came to Coanda, and from there to a site, where a very interesting idea is proposed: "In London in 1970 or thereabouts I met an elderly woman at a meeting of the Aetherius society to which I had a chance invitation. She claimed to be the...
by Röör
Fri Sep 26, 2008 1:27 pm
Forum: Ramjet forum
Topic: "Flat" Ramjets as in Fleissners Patent, feasability?
Replies: 15
Views: 7822

Re: "Flat" Ramjets as in Fleissners Patent, feasability?

Thank you very much for your comment! The big problem with tipjets isn't usually engine design per se, but rather, getting fuel flow to work right and be properly controllable for throttling. The centrifugal effect is horrendous for liquid fuel because of the high fluid density. Sure I also think th...
by Röör
Wed Sep 24, 2008 2:31 pm
Forum: Ramjet forum
Topic: "Flat" Ramjets as in Fleissners Patent, feasability?
Replies: 15
Views: 7822

Re: "Flat" Ramjets as in Fleissners Patent, feasability?

I saw, in this forum, that there are pictures from two professional ram jet helicopters. What astounded me was, that both of them have flat ramjets ! I personally really wonder why did they all use flat ramjets for this? When I look at one of these helicopter ramjets, it looks more like two conventi...
by Röör
Tue Sep 23, 2008 9:03 am
Forum: Ramjet forum
Topic: "Flat" Ramjets as in Fleissners Patent, feasability?
Replies: 15
Views: 7822

Re: "Flat" Ramjets as in Fleissners Patent, feasability?

Thank you, quite odd this cage of coal inside, but Interesting. A flying stove... So it's good, that Ramjets only start to work at quite some air speed, otherwise all our stoves would fly away :lol: Here's the Ramjet constructional descriptions of the patent: [...]jet channels are spaced within and ...
by Röör
Mon Sep 22, 2008 7:55 pm
Forum: Ramjet forum
Topic: "Flat" Ramjets as in Fleissners Patent, feasability?
Replies: 15
Views: 7822

"Flat" Ramjets as in Fleissners Patent, feasability?

Hi, This is my first post. As I saw that this is the forum on the net about PJ's and Ramjets, with the most experienced (non army) people, I thought this is, where I can post my questions... I think some of you know Fleissner's Patent (US 2,939,648). Its about a rotating Jet aircraft. [ http://img54...