Search found 125 matches

by Mark 42
Fri Nov 28, 2008 4:57 pm
Forum: Off topic forum
Topic: Send a Free Thank You Postcard to U.S. Troops from Online.
Replies: 0
Views: 1197

Send a Free Thank You Postcard to U.S. Troops from Online.

If this is a repost, or considered Spam, I'll gladly take the heat for it. This is no hoax... Xerox will send a postcard on your behalf. I decided to do this before I forward the message so that I wouldn't forget or get lazy about it. It only took a few minutes, and it seems important enought to be ...
by Mark 42
Fri Jun 22, 2007 8:52 pm
Forum: Tools and Construction
Topic: [off topic] brazing SS with copper or brass?
Replies: 8
Views: 5157

You can get silver solder, and silver brazing rods at places like Home Depot.

If I understand right, you are brazing SS to SS, right?

I would try ordinary brazing rod & see if it holds unless
it is a critical application.
by Mark 42
Thu Jun 14, 2007 5:06 pm
Forum: Off topic forum
Topic: So long...And thanks for all the fish
Replies: 13
Views: 6064

Ginger Altoids and Meclizine are the two best remedies (actually, best used as preventatives) for seasickness. Other forms of Ginger are fine (even Ginger Ale if it is the real thing). Meclizine is sold as Binine and as Non-Drowsy Dramaine. I have been sailing for 35 years, including racing offshore...
by Mark 42
Thu Jun 14, 2007 3:45 pm
Forum: Valveless pulsejet forum
Topic: Elektra II Runs Unbelievably Well!!
Replies: 66
Views: 20850

I'll eventually try it with a larger fuel line. I got some braided stainless hose with 1/4 compression fittings for an ice maker (10 ft for $8 at Ace or True Value) and a 6 foot length of SS brake line (as you suggest). I have a sailboat that needs me first, but during the week I might squeeze in so...
by Mark 42
Wed Jun 13, 2007 3:05 pm
Forum: Off topic forum
Topic: Hearing Damage. Any suggestions on recovery?
Replies: 34
Views: 14727

berquistj@peoplepc.com wrote:I want to shake the hand of the man that measured the Hiroshima Bomb (noise).
He's on tough Son Of A Bitch!
WHAT?
by Mark 42
Tue Jun 12, 2007 6:35 pm
Forum: Valveless pulsejet forum
Topic: Elektra II Runs Unbelievably Well!!
Replies: 66
Views: 20850

The simplicity of the hull geometry would make it easy to build.
Hmm....
by Mark 42
Mon Jun 11, 2007 6:21 pm
Forum: Valveless pulsejet forum
Topic: Elektra II Runs Unbelievably Well!!
Replies: 66
Views: 20850

Here are a few pics of the thrust test setup. Scale reads 1.8 which corrects to 1.9 pounds with correction for error (used a known weight to calibrate) http://www.pbase.com/mark_42/image/80246203/medium.jpg The test setup from just outside the garage door http://www.pbase.com/mark_42/image/80246204/...
by Mark 42
Sat Jun 09, 2007 9:07 pm
Forum: Valveless pulsejet forum
Topic: Elektra II Runs Unbelievably Well!!
Replies: 66
Views: 20850

Yes, I did. I'll have to look again at the videos to see if the wire was removed in any of them. I have a few pictures, but will need to crop them and upload them. I'm pretty sure there are some of it running w/o the plig wires. I tried to start it with a propane torch first, but couldn't get it to ...
by Mark 42
Sat Jun 09, 2007 5:43 pm
Forum: Valveless pulsejet forum
Topic: Elektra II Runs Unbelievably Well!!
Replies: 66
Views: 20850

Roller skates would work. I met my wife on roller skates (I used to skate about 5 nights a week) Anyway... Last night after work I did some thrust measurements - 1.9 Pounds... I will have to add fenders like on a tractor to protect the front wheels from the heat (They melted on the inboard edges) He...
by Mark 42
Thu Jun 07, 2007 3:49 pm
Forum: Valveless pulsejet forum
Topic: Elektra II Runs Unbelievably Well!!
Replies: 66
Views: 20850

I've been thinking of using an old fire extinguisher for the same purpose.

But for under $13, I think I'll add one to my next order
(Maybe Harbor Freight).

Though I have got a couple of expired fire extinguishers, so if
the fittings are cheap enough, it might be worthwhile to use one.
by Mark 42
Thu Jun 07, 2007 2:35 pm
Forum: Valveless pulsejet forum
Topic: Elektra II Runs Unbelievably Well!!
Replies: 66
Views: 20850

I considered hairspray as propellant for when I need lightweight instead of burn duration, but how to attach might be an issue. Is the can has a stem which fits into the nozzle rather than the nozzle having a stem that goes into the valve on the can I might be able to rig a tube and an actuator mech...
by Mark 42
Wed Jun 06, 2007 9:33 pm
Forum: Valveless pulsejet forum
Topic: Elektra II Runs Unbelievably Well!!
Replies: 66
Views: 20850

I'd be willing to bet most of the users on this forum have some sort
of similar experience.

It the sorts of things that attract people to a forum like this...
not just thinking outside the box, but operating there too.
by Mark 42
Wed Jun 06, 2007 7:45 pm
Forum: Valveless pulsejet forum
Topic: Elektra II Runs Unbelievably Well!!
Replies: 66
Views: 20850

I don't plan to be close to it when it fails, so I sorta like the dramatic kaboom.

Of course it could end up like the retriver dog who brought back the
lit stick of dynamite
.
by Mark 42
Wed Jun 06, 2007 7:37 pm
Forum: Valveless pulsejet forum
Topic: Elektra II Runs Unbelievably Well!!
Replies: 66
Views: 20850

Your psychologist must really wonder about you... ;) I realize now that you all might think this applies to you. I know this because I returned to this thread, read it, forgot for a few seconds that I was the one who wrote it, and thought it was directed at me. Yes, the propane propellant makes sen...