through the closure thickness. The hole gets filled with grease and the
sensor screwed in.
-The first example is a 98mm snap-ring clossure, with the
+The first example is a 98mm snap-ring closure, with the
sensor and electronics mounted off-center so a 3/8" all-thread could be used
-in the center for motor retention in a minimum-diameter-ish airframe. The
-mounting bracket for the electronics was bent from a bit of 1/16" aluminum
-sheet and screwed to the forward closure with two short 4-40 screws into
-tapped and drilled mounting holes. Note the use of an A23 12v alkaline battery
-in a holder on the bracket wiht the
+in the center for motor retention in a minimum-diameter-ish airframe. This
+motor had a small gap between the last propellant grain and the forward
+closure, so having the pressure sampling port off-center wasn't a
+problem. The mounting bracket for the electronics was bent from a bit of
+1/16" aluminum sheet and screwed to the forward closure with two short 4-40
+screws into tapped and drilled mounting holes. Note the use of an A23 12v
+alkaline battery in a holder on the bracket with the
EasyMotor prototype. These batteries are fine for a flight or two, and both
they and the little holders for them are cheap on Amazon and make installations
like this fairly easy to put together:
This example is a refinement of the 16-gauge steel strap used to form a mounting
bracket and harness retention point, this time for a 54mm snap-ring closure.
Bdale has flown this setup several times now, and the only down-side is that
-it obvious takes up a few extra inches of airframe length. Note the quik-link
+it obvious takes up a few extra inches of airframe length. Note also the quik-link
wrapped in electrical tape to make sure it doesn't flop down and short against
any of the electronics in flight. Note also a long piece of shooter wire that
gets fed through a vent hole in the airframe as a twist-n-tape power switch.
## Availability ##
-Prototypes of v2 were built and successfully flown. An initial production
-batch is now underway, and we hope these will be for sale around the end of
-calendar year 2020.
+Prototypes of v2 were built and successfully flown. The initial production
+run is back from our surface-mount assembler, and testing is underway. We
+hope to have these available for sale by February 2021.