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book about amateur rocketry
Very nice find, I'm taking notes :-)
23-4-2021 at 22:58
by: Fulmen
Distinguishing between coatings and surface treatments
The shiny surface looks like regular machined aluminum to me, possibly anodized. The dark one could ...
18-4-2021 at 23:06
by: Fulmen
oh my god! 2900$ for a mortar???
[rquote=658261&tid=157291&author=Morgan]
https://phys.org/news/2016-07-lab-titanium-gold-al ...
16-4-2021 at 09:51
by: Fulmen
oh my god! 2900$ for a mortar???
First off: Forget about titanium, it's not the solution even if the cost isn't an issue.

And it' ...
14-4-2021 at 10:44
by: Fulmen
home made rocket fuel.
[rquote=657603&tid=11583&author=Pyro_cat]Every rocket even NASA, everyone gets far away from ...
13-4-2021 at 12:19
by: Fulmen
oh my god! 2900$ for a mortar???
Titanium might be abundant, but the refining process (Kroll) is exceedingly inefficient and therefor ...
13-4-2021 at 12:02
by: Fulmen
oh my god! 2900$ for a mortar???
Steels can work harden too you know. The workhorse of the industry, Ti6Al4V, has an ultimate tensile ...
13-4-2021 at 11:37
by: Fulmen
oh my god! 2900$ for a mortar???
Titanium would be a poor choice for a mortar. Contrary to common belief titanium isn't particularly ...
13-4-2021 at 07:12
by: Fulmen
Need to make some kind of liquid lubricant for brass/steel contact
Zed: The case lube must be removed before firing either way. And the gun should be cleaned after use ...
12-4-2021 at 12:41
by: Fulmen
Need to make some kind of liquid lubricant for brass/steel contact
Lanolin has been used for ages, that's not by chance. Can be used neat or mixed with petroleum jelly ...
12-4-2021 at 11:38
by: Fulmen
Filter madness
That was really the size I was looking for, but I'm glad I found these.
5-4-2021 at 09:49
by: Fulmen
Filter madness
Sorry, I forgot to specify "coffee filters". And they aren't 200mm they are 460mm when flattened.
4-4-2021 at 13:12
by: Fulmen
Sulfur in my KCLO3 flash - Do I need it ?
There are a few legitimate uses for chlorate/sulfur compounds. I have used it for match heads myself ...
4-4-2021 at 13:08
by: Fulmen
Filter madness
I needed a better supply of large filter paper, so I found a shop with those basket style coffee fil ...
4-4-2021 at 11:08
by: Fulmen
why still lead in paints that are labeled "Lead Safe" ?
No, I'm pretty sure it's added deliberately. Some lead compounds are excellent siccatives (curing ac ...
2-4-2021 at 12:49
by: Fulmen
titanium dioxide turns yellow when heated.
James: That's surface oxidation of metallic Ti, not TiO2. According to [url=https://en.wikipedia.org ...
1-4-2021 at 09:32
by: Fulmen
Removing dissolved organics from ammonia solution
Just use the same amount of water and you should end up with roughly the same concentration.
31-3-2021 at 07:43
by: Fulmen
very brittle coating on TLC
I naturally assumed plaster as I see little point in adding (hydrated) gypsum. But good call, not al ...
30-3-2021 at 11:54
by: Fulmen
very brittle coating on TLC
A coffee mill should do the trick, kitty litter is pretty friable in my limited experience.

As f ...
30-3-2021 at 10:26
by: Fulmen
Demonstrations about the science of plastics
Don't forget the first polymer: Cellulose. Making Rayon isn't too hard to pull off...
28-3-2021 at 12:52
by: Fulmen
very brittle coating on TLC
Wack is right, it's the wrong type. You need activated alumina, the abrasive quality is just hard sa ...
27-3-2021 at 13:50
by: Fulmen
3D printing useful parts - anyone doing this? I'd like to print GL45 bottle caps if possible
I'm ressurecting this thread if nobody minds.
Needed a small (45mm) funnel, figured the printer was ...
26-3-2021 at 11:39
by: Fulmen
Nitric oxide/antiviral nose spray for COVID-19
Wow. Nitrogen oxide is pretty harmful stuff, 25ppm/8h.
22-3-2021 at 12:09
by: Fulmen
Delrin as paraformaldehyde source?
[rquote=655501&tid=8337&author=Fyndium]It sort of works[/rquote]
I would argue that it kind ...
27-2-2021 at 15:00
by: Fulmen
Attempt to make molten lead from oxalate
Fair enough, I was thinking aqueous conditions.

As for a practical demonstration a test tube wou ...
22-2-2021 at 12:43
by: Fulmen
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