Installation Tips - Jolly logic AltimeterOne User Manual

Installation Tips

Your altimeter can ride in a payload bay or in the main
fuselage of a rocket, inside a plane, or clipped to your
kite. In any case, follow these guidelines for best results.
Let It Breathe
The altimeter needs to sense outside atmospheric
pressure at all times. For rockets, we advise that you
punch at least three 1/8" diameter holes evenly spaced
around the rocket as close to the nosecone as possible,
but low enough not to be blocked by the nosecone once
it is inserted. The holes can be quite small (the diameter
of a pencil lead), but make sure that they are not
blocked when you launch.
Altimeter on Top
For rockets, placing the altimeter as close to the nose as
possible protects it from exhaust gases, allows it to be as
near as possible to your vent holes, and assists in
keeping the center of gravity of your rocket above its
center of pressure so that it remains stable in flight.
Option to Consider: Streamer Recovery
On a windy day when you're worried that you might
lose your rocket—or when you're worried your payload
bay or plane may come apart—consider adding a
streamer to the altimeter. It's okay to wrap the streamer
around the body of the altimeter, since the altimeter
"breathes" through a hole near its attachment loop on
the end.
jolly 3 logic
Vent holes
are important!