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ThunderGuppy is the third generation of SSI rocket flight computer. It's hardware was developed in 2019 by Tim Vrakas. ThunderGuppy followed the SkyBass and SpaceSalmon, making the naming scheme O-Fish-ial. ThunderGuppy was the smallest generation of the family to date, and was designed to fit as a standalone module into a standard 2" airframe, much like the Stratrologger and Raven COTS Altimeters.
=== Hardware Features ===
From the start, ThunderGuppy was designed to be mostly compatible with the earlier SpaceSalmon. Aside from the major change to form factor, Guppy introduced the following changes:
*Integrated [[S6C]] and GPS hardware, in place of an add-on RF carrier module needed for SpaceSalmon.
*Two FET-based squib drivers, in place of the MC33797 4-channel squib driver IC. These are not designed to safely control high-risk initiators, but decrease complexity.
*A single 18650 Li-Ion cell. This was needed to satisfy the form factor requirement.
*Dual accelerometer banks, each with high and low range 3-axis sensors. This allows emulation of a high-range gyroscope by indirect measurement of centripetal acceleration.