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At the meeting there was strong interest from a number of people in the room.Besides being too small for really large rockets, the bicycle wheel tower is also pretty short. I’d sure love to see a taller tower to reduce…   Read more»

A decent absolute pressure gauge and relief valve on your vacuum pump can adjust things to a pretty fine degree if you’ve got the right relief valve. You can easily, as I’m sure you know, compute the pressure altitude from…   Read more»

I’d especially break it if my chamber implodes. But it looks like you were doing just fine testing your altimeter in your own chamber.

Well, my vacuum pump really sucks after all. In a good way. It turned out that one of its fittings was loose, so once I fixed that, it really pulled it down hard. It inverted the lid of the rubbermaid…   Read more»

Well, my vacuum pump really sucks after all. In a good way. It turned out that one of its fittings was loose, so once I fixed that, it really pulled it down hard. It inverted the lid of the rubbermaid…   Read more»

Well, my vacuum pump really sucks after all. In a good way. It turned out that one of its fittings was loose, so once I fixed that, it really pulled it down hard. It inverted the lid of the rubbermaid…   Read more»

Scott, a micron is a very small moron, or a millionth of a meter.Never thought you were the name calling type 😀

My vacuum pump pulls to 25″ Hg… don’t know what that corresponds to altitude-wise or in millibars or whatever, but it sure can pull v-bagging down tight on a lay-up.WarrenAll other things being eqaul 1″ is about 1000 feet(at our…   Read more»

Fun google tip: Type “25 inches of mercury in Pa” in Google search (or your Google toolbar) and it will tell you the answer. I use Google now for my calculator whenever I’m at a computer. BTW, 84.6 kPa corresponds…   Read more»

My vacuum pump pulls to 25″ Hg… don’t know what that corresponds to altitude-wise or in millibars or whatever, but it sure can pull v-bagging down tight on a lay-up.Warren

Yeah, where did you get your pump?Santa brought me one for Christmas from Aircraft Spruce that I thought was going to suck out at least 80-90% of atmospheric pressure, but sadly it doesn’t suck that much…er… well, you get the…   Read more»

Indeed, the micron is 1 millionth of a meter and was originally called the micrometer. (See millimeter, centimeter, decimeter, etc. etc.)However, I think it popular culture making it a millionth of a moron at least is a helluva lot funnier….   Read more»

Are you sure thats what a Micron is? That would mean every one in Battlestar Galactica was very very tiny. Even Lorne Greene! They would never get to earth, at the rate they would have been traveling! So when the…   Read more»

Yes do use safety glasses. In fact I would have recommended to use even thicker material. I use 1/2 and 3/4 inch thick Lexan/acrylic when I vacuum process my propellants and even then I end up with more or close…   Read more»

I dont even know what a micron is!

Scott, a micron is a very small moron, or a millionth of a meter.

BTW each of the missile works stuff is all calibrated by vacuum chamber. In fact a very expensive highly accurate 100,000 ft + capable one.Nice to know! First time I heard of that one. Im just worried about getting back…   Read more»

Yes do use safety glasses. In fact I would have recommended to use even thicker material. I use 1/2 and 3/4 inch thick Lexan/acrylic when I vacuum process my propellants and even then I end up with more or close…   Read more»

Yes do use safety glasses. In fact I would have recommended to use even thicker material. I use 1/2 and 3/4 inch thick Lexan/acrylic when I vacuum process my propellants and even then I end up with more or close…   Read more»

Breathing apparatus necessary above 25,000′ – apply now to the TRA BoD if you’re planning on going over the established waiver limits. Unless you’re like the late Sir Edmund and can rough/tough it out. We’ve got General clearance to 20K….   Read more»

I tested one of my new Missle works Altimeters today. Not Bad. Made three runs in the vacume chamber. Started at 5000 feet (since thats our altitude here) and took it strait to 10000 each tilme. I come to find…   Read more»