Search found 518 matches

by Mike Kirney
Sat Oct 18, 2003 2:35 pm
Forum: Tools and Construction
Topic: poliester resin question
Replies: 15
Views: 12507

The Violet One Is Styrene

From reading your last post, Pablo, I can tell you the violet substance is dissolved styrene, and the clear stuff is MEK. The styrene is added to the resin to promote molecular cross-linking and the MEK is the catalyst that causes the cross-linking reaction. The more MEK you add, the faster your res...
by Mike Kirney
Sat Oct 18, 2003 2:27 pm
Forum: Tools and Construction
Topic: poliester resin question
Replies: 15
Views: 12507

Heated Tanks?

You used to heat your MEK in tanks? I can only imagine what the room must have smelled like. I used to use it with paper towels to wipe the brake dust off of jumbo jet wheels. I remember it evapourating almost instantly after it was applied and the fumes gave me a nasty headache and they made my nos...
by Mike Kirney
Sat Oct 18, 2003 2:49 am
Forum: Tools and Construction
Topic: poliester resin question
Replies: 15
Views: 12507

That Clear Stuff

That transparent substance is methyl ethyl ketone, isn't it? I'm pretty sure that the violet stuff is styrene but maybe its the other way around. MEK is quite a common solvent in aircraft maintenance shops, and might be in other mechanical maintenance places too.
by Mike Kirney
Sat Oct 18, 2003 2:00 am
Forum: Valved pulsejet forum
Topic: Improved Tundra-Jet Valve Array
Replies: 25
Views: 19504

Clamping and/or Brazing

Now I'm thinking I will put a strip of flat 22 ga. steel down the rivet line at the back of the valves before i fasten them in place. I could even bend up a semi-circular piece of 'channel' to mimic the curved washer in a petal-valve system. How about this idea - what if I riveted the reeds in place...
by Mike Kirney
Sat Oct 18, 2003 12:18 am
Forum: Valved pulsejet forum
Topic: Improved Tundra-Jet Valve Array
Replies: 25
Views: 19504

Valveplate Design

Thanks for you commentaries, Bruce and Larry. I'm going to try running the jet with the reeds just pop-riveted in place at first and see how it goes. Except for the absence of the valve retainer, my valve design pretty much follows Bruce's advice. If a valve retainer is required, I think I will try ...
by Mike Kirney
Sun Oct 12, 2003 6:06 pm
Forum: How to improve this site
Topic: Off topic forum The sequel!
Replies: 9
Views: 6962

So Many Forums, So Many Topics, Such A Wide, Wide Web

Principal Skinner is right on the money. I use anywhere from three to six forums regularly, all for different topics, and for many different reasons. Generally, I will come here to discuss things mechanical/thermodynamic and then I will head over to The British Empire.com to make fun of other cultur...
by Mike Kirney
Sun Oct 12, 2003 5:50 pm
Forum: How to improve this site
Topic: How to improve the site. Easy. Ban Ivar
Replies: 7
Views: 5302

So Many Methods, Which To Use?

If banning IPs is easier, well then, thats the way to go. I'm no expert, just a well-travelled netizen, and I was speaking from my general experience as a web user, not from any sort of formal education. I used that free anonymizer on a different forum where IPs and hosts are displayed, and it worke...
by Mike Kirney
Sun Oct 12, 2003 3:03 pm
Forum: How to improve this site
Topic: How to improve the site. Easy. Ban Ivar
Replies: 7
Views: 5302

A Word Filter Is The Answer

Easier said than done, Mr. Skinner . Banning individual IP addresses is futile because most ISPs assign you a different one every time you log on to the internet from a pool of numbers they lease. Blocking his domain will prevent other potential site users using the same ISP from accessing the forum...
by Mike Kirney
Sat Oct 11, 2003 2:41 pm
Forum: Valveless pulsejet forum
Topic: Reynst Drum
Replies: 7
Views: 7206

Re: Proposed Formula for Orifice Diameter in Reynst Jar

So, with an internal radius of 11.5" and an internal length of 34", the corrected length would be 41" and the orifice radius would be not quite 2" for an opening of just about 4". I don't know if it is relevant or correct, but it was fun trying to figure it out. Andrew Parker Those dimensions I quo...
by Mike Kirney
Sat Oct 11, 2003 2:06 pm
Forum: Valved pulsejet forum
Topic: For Your Comments & Criticism: Proposed Pulse Turbine
Replies: 14
Views: 10599

Inconsistent Pulsating Flow

I like it. It looks sort of like an old Wincharger laying on its side. I'm not sure if the turbine wheel would spin or just oscillate through a few degrees. I think you could extract some energy if you attached the wheel to a ratchet/spring mechanism so that you could collect the energy of individua...
by Mike Kirney
Sat Oct 11, 2003 1:51 pm
Forum: Valved pulsejet forum
Topic: Improved Tundra-Jet Valve Array
Replies: 25
Views: 19504

Valve Area

I think he might have been talking about my jet, Pieter. Ivar, I'm not sure if I have provided enough valve area either, but if it doesn't work I have plenty of room to make more valveholes. The important ratio is effective valve area to exhaust area. Right now the aggregate total area of all the va...
by Mike Kirney
Sat Oct 11, 2003 12:55 am
Forum: How to improve this site
Topic: Off topic forum The sequel!
Replies: 9
Views: 6962

Content Control

Banning users is harsh, and I doubt it would work very well. Dynamic IP means that you would need to accumulate a huge databank of one person's IPs to effectively ban them. 'Anonymizers' would also make banning somebody extremely difficult. I think a word filter and live human moderators is the way ...
by Mike Kirney
Thu Oct 09, 2003 1:16 pm
Forum: Valveless pulsejet forum
Topic: Reynst Drum
Replies: 7
Views: 7206

Sealing etc.

I raked the ground as smooth as I could and I had dirt piled up all around the bottom during the nighttime test so the sealing was pretty good I think. When I placed the drum over the fire it would die down almost instantly, but when I removed it, it would flare right back up. To me, this says 'lack...
by Mike Kirney
Wed Oct 08, 2003 10:26 pm
Forum: Valved pulsejet forum
Topic: Improved Tundra-Jet Valve Array
Replies: 25
Views: 19504

You Should Try One Out

Your pieces look very well-made. Its too bad you haven't tried any of them. Is propane very expensive in the Netherlands?
by Mike Kirney
Tue Oct 07, 2003 11:53 pm
Forum: Valved pulsejet forum
Topic: Improved Tundra-Jet Valve Array
Replies: 25
Views: 19504

Have You Tried It Anyway, Pieter?

I hope you've tried using it at least once. You never know, it might work just fine.