Hot on the heels of the first test of the improvised vacuum pump for our Low Orbit Helium Assisted Navigator (LOHAN) Rocketry Experimental High Altitude Barosimulator (REHAB) experiment, we're pleased to report that we've put together the shed-built hypobaric chamber which will form the centrepiece of our explosive tomfoolery. …
we have ignition...
The actinic glare of the engine's ravening flames is beautiful.
Ah, "ravening". Brings back memories of the great Lensman space battles...
That's more like it!
No proper project is complete without some welding I'd say
Re: That's more like it!
Agreed. Proper hands-on stuff, and plenty of sparks.
Will no-one think of the doggies?
H&S, PETA and the RSPCA will have fits if they see the bit of the vid with the doggie running around near an "active space rocket motor".
Keep up the good work, chaps.
LOHAN's mighty flaps...
Hmm... could it be:
(PISSFLAPS for short...)
Looks like a nice set-up if slightly over-engineered for a simple test to see if the motor will ignite at cold and altitude, a piece of plastic piping and good dollops of epoxy resin would have done the job but it would'nt have been reusable.
Also not having gone with my suggestion of routing the leads under the lid over the seal is probably a good idea looking at the puny pump you are using, it has happened to me several times at work in our test chamber and it has vacc'd down no problem, but we are using a nice Edwards Model E1M8 vac pump which laughs in the face of your puny equipment!
Looking forward to seeing the results.
Er, if you're going to ignite the rocket motor inside an evacuated steel tube, what are you going to do with the exhaust gas from the motor? Sounds like you've made quite a nice little bomb, there. A millisecond or so after ignition the chamber is going to be a long, long way from a vacuum.
That's why the lid isn't fastened on, just held in place by air pressure.
And now what if the rocket doesn't fire in a vacuum? You could land up with a piece of space junk right in you garage before it even flew.
Anyway, It makes me happy that I'm in the southern hemisphere when I read all this about people firing amateur rockets under uncontrolled conditions at high altitude. I sure hope that thing is pointing out to space when it fires. What are the insurance / legal implications of this?
Re: What if....
Well, the point of test is to see if it fires or not. If it doesn't we find another type of motor, which does. That's why we do the tests.