Search found 67 matches

by vhautaka
Fri Jul 21, 2006 8:57 am
Forum: Off topic forum
Topic: A different type of jetpack
Replies: 15
Views: 5599

re: A different type of jetpack

A bit more off topic, check: http://www.rcgroups.com/forums/showthread.php?t=491653&pp=15 http://www.marksparaglidingpages.com/videopop.php?videoid=150 A LiPoly pack + an efficient electric motor would be the way to go if I was to implement a backpack propeller thingy for serious parachute use. Envi...
by vhautaka
Wed Jul 19, 2006 11:17 am
Forum: Off topic forum
Topic: A different type of jetpack
Replies: 15
Views: 5599

re: A different type of jetpack

How about... A small pulsejet or two, balanced on an axle, rotating a propeller of some kind? Maybe put the entire thing inside a duct, with propellers/fans on one or both ends of duct? Guiding vanes to make it propel nice and straight? Should also help with the sound and vibration problems a bit, a...
by vhautaka
Sun Feb 22, 2004 9:56 am
Forum: Valveless pulsejet forum
Topic: Thermal changes in geometry, and the effect on starting, etc
Replies: 58
Views: 24846

Hmm... to return to topic somewhat. :) Has anyone thought that maybe the "boundary layer effect" some have mentioned is actually a good thing? Kazoo has constant wall area from front to end. Tharratt suggested corrugated intake opening walls to reduce thermal geometry problems. Now, corrugations onl...
by vhautaka
Thu Feb 19, 2004 9:26 pm
Forum: Valveless pulsejet forum
Topic: 75mm Locky Kazoo (say that 10 times fast)
Replies: 107
Views: 66395

Okay! :) Say, something like the design in my line drawing, I'll start with an outer pipe of 6" dia. or thereabouts. In order to follow the specific relations of the Kumar design, CCdia of 165, intake 25, tailpipe 50: The innermost pipe will be 3" dia, so the CC cross-section area in the front will ...
by vhautaka
Thu Feb 19, 2004 8:17 pm
Forum: Valveless pulsejet forum
Topic: 75mm Locky Kazoo (say that 10 times fast)
Replies: 107
Views: 66395

Hmm, would this be the same Kumar as in http://cgpl.iisc.ernet.in/high_int_low_emission_burner.pdf ? Kinda familiar shapes there too! Interesting, they seem to be doing good research in India. Not meaning propulsion, but distributed renewable energy production and such. I hope Europe wakes up someda...
by vhautaka
Thu Feb 19, 2004 7:40 pm
Forum: Valveless pulsejet forum
Topic: 75mm Locky Kazoo (say that 10 times fast)
Replies: 107
Views: 66395

If you wanted to power anything with it, you would have to bend it, or add some kind of a deflector or 'recuperator' to the front. Oh, no worries about that. I would turn the front inside out and just try to keep the areas somewhat right. This would reduce the outer diameter/length ratio, the engin...
by vhautaka
Thu Feb 19, 2004 5:21 pm
Forum: Valveless pulsejet forum
Topic: 75mm Locky Kazoo (say that 10 times fast)
Replies: 107
Views: 66395

Regarding that Kumar thing, I've always wondered why valveless inlets never extend into the CC. Well, apparently some do. Great. Another "original" idea stolen probably before I was born... :) Now... if this design has any ease of starting at all, I think those areas could be where to start with the...
by vhautaka
Thu Feb 19, 2004 8:07 am
Forum: Valved pulsejet forum
Topic: Resizing solved, but...
Replies: 29
Views: 14024

If anybody has the book in digital format, I'd like to give it a look.

I just barely understand russkij, but I have friends I can bug with any hard words / expressions. :)


- ville
by vhautaka
Wed Feb 18, 2004 6:15 am
Forum: Valveless pulsejet forum
Topic: 2004-02-14 - Pulsejet History Well and Truly Made
Replies: 61
Views: 26648

brunoogorelec wrote: This is the best drawing with dimensions that I have.
How about the drawing on this site? :) http://www.pulse-jets.com/count/pulse.php?ID=6

It should scale well for a slightly larger version with 3" or 4" dia. cc, don't you think?


- ville
by vhautaka
Tue Feb 17, 2004 2:53 pm
Forum: Valveless pulsejet forum
Topic: Little Logan sounds
Replies: 18
Views: 8680

Thanks! :) Am I the only one to think that _this_ would be pretty damn easy to implement in pyrex glass, given the everyday tube dims and small size? And then, a slightly larger diameter clear plastic tube to act as a water cooling jacket / shield from shards should the very thinkable happen.. - ville
by vhautaka
Tue Feb 17, 2004 1:37 pm
Forum: Off topic forum
Topic: Steam Cars
Replies: 20
Views: 8361

Oh, I'm not the one after overunity... and I do know how full of shit many alternative "scientific" sites are. However, this Naudin doesn't seem to be a moron, just a bit more enthusiastic than some people can take. At least he has posted his test arrangements and measurements on the web for anyone ...
by vhautaka
Tue Feb 17, 2004 11:59 am
Forum: Valveless pulsejet forum
Topic: 75mm Locky Kazoo (say that 10 times fast)
Replies: 107
Views: 66395

Great, Mike!

The world got a much better place after seeing this video. Good development work, I wish I can keep from trying a replication at home (the neighbors, the neighbors...)


- ville
by vhautaka
Tue Feb 17, 2004 11:35 am
Forum: Valveless pulsejet forum
Topic: Little Logan sounds
Replies: 18
Views: 8680

Nice, especially thinking it's just plumbing supplies put together the right way.

What are the dimensions for this one?


- ville
by vhautaka
Fri Feb 13, 2004 10:30 am
Forum: Off topic forum
Topic: Steam Cars
Replies: 20
Views: 8361

Re: Comtemporary Sentiments

I proposed the use of Sodium as a fuel source in the 70's, when the depletion of Petroleum became known to me. The engine would be a closed-cycle catalytic reaction. I never worked out any details beyond the fact that a fifty pound engine could generate 450 horse-power. Throttle of the reaction app...
by vhautaka
Tue Feb 10, 2004 2:03 pm
Forum: Tools and Construction
Topic: A pulse jet powered wagon...
Replies: 11
Views: 5738

Heh, this is way crazier than my idea of a pulsejet / rocket ice-sledge. A way to get a few km of relatively flat and straight "road" for a slow-accelerating vehicle with low initial thrust. Just secure the track from unsuspecting humans and fire the thing away a couple of times unmanned with a smal...