I built this altimeter tester this afternoon. Seems to work fine. I installed a whole 38 mm EBAY with e matches installed.
12 Volts on the pump. A finger over the open end of the T and the altimeter stopped warbling. took it off and the drogue e match fired and soon after the main fired. The e matches stained the jar a little. I may not use e matches for all tests.
A needle valve at the open end of the T would allow a slow release of the jar vacuum.
The Jar and the sealed top came from Amazon. I picked up the Pump at Electric Goldmine for about $7.
I use Egg Timer Altimeters and being to test my solder work before launching is nice to know.
12 Volts on the pump. A finger over the open end of the T and the altimeter stopped warbling. took it off and the drogue e match fired and soon after the main fired. The e matches stained the jar a little. I may not use e matches for all tests.
A needle valve at the open end of the T would allow a slow release of the jar vacuum.
The Jar and the sealed top came from Amazon. I picked up the Pump at Electric Goldmine for about $7.
I use Egg Timer Altimeters and being to test my solder work before launching is nice to know.