Search found 3549 matches

by Bruno Ogorelec
Fri Jan 02, 2009 8:09 pm
Forum: Jet Vehicles, All Types
Topic: Ekranoplan?
Replies: 7
Views: 2588

Re: Ekranoplan?

larry cottrill wrote:Bruno -

The "scoop" is rear-facing
Hmmm... but then, it wouldn't generate the same aerodynamic effect, would it? It would be a wing, not a scoop.
by Bruno Ogorelec
Wed Dec 31, 2008 2:21 pm
Forum: Jet Vehicles, All Types
Topic: Ekranoplan?
Replies: 7
Views: 2588

Re: Ekranoplan?

Seems like a good use for a compact "linear" engine like the old linear FWEs. Mount the engine backward so the intake points aft. Pick up all the exhaust pipe effluent with a "scoop" that bends it around underneath the wing-shaped body I don't think I understand the layout you are proposing. I see ...
by Bruno Ogorelec
Wed Dec 31, 2008 7:22 am
Forum: Valved pulsejet forum
Topic: Tenney's rotary Dynajet
Replies: 15
Views: 2774

Re: Tenney's rotary Dynajet

More ideas coming. The air intake to the outer chamber should be lengthened, so that the gas flow sucks fresh air through a longer duct and generates positive fresh air pressure (ram pressure) on the combustion chamber intake. Eliminate the valves; this thing would happily run without them, given pr...
by Bruno Ogorelec
Wed Dec 31, 2008 7:04 am
Forum: Valved pulsejet forum
Topic: Tenney's rotary Dynajet
Replies: 15
Views: 2774

Re: Tenney's rotary Dynajet

To me, it looks as if the thing would benefit from Stage 2. Instead of having a single tangential exhaust from the outer casing, I'd duct the mixture of exhaust gas and fresh air around the lip of the backing plate and onto a radial turbine, as on a Whittle turbojet. See the very crude sketch below....
by Bruno Ogorelec
Tue Dec 30, 2008 10:08 pm
Forum: Jet Vehicles, All Types
Topic: Ekranoplan?
Replies: 7
Views: 2588

Re: Ekranoplan?

Larry, the point is that the ground effect acts as if it extended the wingspan. So, imagine the wingspan tripled and you get to somewhere near the equivalent of the 'normal' aircraft. Another way to do it is to create an air 'cushion' under the vehicle by pushing air under the vehicle. Imagine a bri...
by Bruno Ogorelec
Tue Dec 30, 2008 6:15 pm
Forum: Jet Vehicles, All Types
Topic: Ekranoplan?
Replies: 7
Views: 2588

Re: Ekranoplan?

Charlie, you can play with a WIG vehicle on your own on a much smaller scale, as one is commercially available in the US: http://www.hovercraft.com/content/index.php?main_page=index&cPath=34_53 I have little doubt that it could be pulsejet-powered, but it would be noisy as hell. It would be a fantas...
by Bruno Ogorelec
Sun Dec 14, 2008 9:30 pm
Forum: Jet Vehicles, All Types
Topic: Pulsejet-powered sailplane
Replies: 10
Views: 4510

Pulsejet-powered sailplane

http://www.lange-flugzeugbau.com/htm/english/products/antares_18p/antares_18p.html Some dubious claims here. The engine is said to represent " the leading edge of a family of jet engines, which can be traced back through more than 60 years of German aviation technology ". Haw-haw-haw... Interesting...
by Bruno Ogorelec
Fri Nov 28, 2008 7:32 pm
Forum: Off topic forum
Topic: Energy needed in order to run turbo compressor
Replies: 2
Views: 886

Re: Energy needed in order to run turbo compressor

Wouldn't it make much more sense to drive the compressor with an electric motor? You'd only really have to upgrade your alternator and battery to cope with the extra load. No other special systems.
by Bruno Ogorelec
Wed Jul 30, 2008 2:11 pm
Forum: Off topic forum
Topic: Finally a more-or-less realistic backpack flying machine
Replies: 4
Views: 1036

Re: Finally a more-or-less realistic backpack flying machine

Well, as I already wrote under the topic that Bill has opened on the same machine (under 'Jet Vehicles'), I think it's a bit of overkill. I think a backpack helicopter with a coaxial counter-rotating rotor and a smaller, 50-100 HP Wankel engine would be a better bet. Probably safer, too. I have no i...
by Bruno Ogorelec
Wed Jul 30, 2008 7:11 am
Forum: Jet Vehicles, All Types
Topic: Introducing the Martin Jetpack
Replies: 4
Views: 1543

Re: Introducing the Martin Jetpack

To comment on the machine itself -- it's a more successful rendition of the Solo Trek layout. Mechanically, I think it's a bit of overkill. I would think a more conventional coaxial rotor assembly powered by an engine of less than half the power of the Martin engine (which is a 200 HP 2-liter two-st...
by Bruno Ogorelec
Wed Jul 30, 2008 7:02 am
Forum: Jet Vehicles, All Types
Topic: Introducing the Martin Jetpack
Replies: 4
Views: 1543

Re: Introducing the Martin Jetpack

Sorry, Bill, just saw you post this here. I posted a long list of links in the 'Off-Topic' section of the forum. I had no intention of 'competing' with your post. I was just hugely entertained by the whole thing. Here's my list repeated: YouTube videos of Martin JetPack http://www.youtube.com/watch?...
by Bruno Ogorelec
Wed Jul 30, 2008 6:59 am
Forum: Off topic forum
Topic: Finally a more-or-less realistic backpack flying machine
Replies: 4
Views: 1036

Finally a more-or-less realistic backpack flying machine

Here are some links to the Martin Jetpack introduced at Oshkosh yesterday. YouTube videos of Martin 'JetPack', which is not quite a jet pack. http://www.youtube.com/watch?v=vyb6vnX1My0 http://www.youtube.com/watch?v=Cgels591kXk http://www.youtube.com/watch?v=58YXSwiyRco http://www.youtube.com/watch?...
by Bruno Ogorelec
Sun Jul 27, 2008 4:24 pm
Forum: Valveless pulsejet forum
Topic: pulse jet investigations.
Replies: 3
Views: 739

Re: pulse jet investigations.

Well, I tickles me pink that they were honest enough to cite my paper among the literature. Though, I really do wonder what the f*** they might have found there that was useful, given the broad range of serious studies that were used in their research. Maybe it was good for a laugh in the coffee bre...
by Bruno Ogorelec
Fri Jul 04, 2008 8:51 am
Forum: Jet Vehicles, All Types
Topic: Air Hummer
Replies: 4
Views: 1576

Re: Air Hummer

I know that it would be excellent theoretically. After all, I've been preaching heat recuperation on pulsejets for years, to all and sundry, to the puzzlement of seemingly everyone. What I doubt is that a serious, practical solution light enough to be used on a flying machine would be employed on a ...
by Bruno Ogorelec
Thu Jul 03, 2008 10:08 pm
Forum: Jet Vehicles, All Types
Topic: Air Hummer
Replies: 4
Views: 1576

Re: Air Hummer

Well, if it worked, it would truly be a big thing. Lack of waste heat recovery is a major bummer in aircraft turbine engines.

Somehow, if it did work, I doubt people would be putting it into an 'Air Hummer' first.