Chris LaPanse

I'll be there 😀 My Nike has a date with a K2045...

There's always Tripoli Colorado next weekend...

I'll gladly help with button pushing whenever I'm not launching. If the weather's remotely decent, I'll have an apogee deploy at 4k+ though, so I don't know how long I'll be out hiking. Whenever I do ...

Not if what Chad said was correct. I would interpret his statement as saying that each fin must measure at least 2.75 inches from the center of the body tube, not the surface.

My guess is that when a large chunk of fuel hits the ground, it cracks or fragments, substantially increasing the burn surface area and dispersing burning chunks.

You can figure out the appropriate temperature and pressure fairly easily from the phase diagram of water. The numbers I used before (1000 PSI at 550F) are actually attainable using the heating-only m...

OK, here are the equations, with somewhat of an explanation. For a nozzle flow, the key defining factor is known as choked flow. When you have choked flow through a nozzle, the flow in the nozzle thro...

Why would you need to pressurize the tank? When you heat the tank, it will pressurize itself. (By the way, just out of curiosity, which school are you going to?)

What equations are you using for those numbers? I cant even start to understand the dynamics books I looked at. Well the equations are fairly complicated, so the easy way is to use tables (which is wh...

So basically that idea would mean you fill the tank partially of water and heat it till its all vapor? Then release it throught the valve and nozzle? Wouldnt that limit the amount of vapor you could p...

Darn. Double post and I can't find the delete button...

I just ran some numbers with a chamber pressure of 1000PSI, a chamber temperature of 550F, and an exhaust pressure of 25 PSI (slightly underexpanded), here's what I get (assuming that the stuff enteri...

The benoulli relation will be relatively useless in this case, since the flow in a rocket motor is definitely compressible (and bernoulli basically assumes incompressible flow). The phase diagram of w...

Hard to say, honestly (especially since I don't remember the event). I'd be surprised if it were mach-related, but it's not impossible.

So if there might be a problem of the water transfering to steam before exiting the nozzle, how can we fix that? should we make the distance between the tank longer so it has more time to change into ...