Bobby Tables lifts off on a Cesaroni J285 in Aimsbury, MA
"Bobby Tables" was designed as a Level 1/Level 2 High Power Rocketry certification attempt and flown during spring 2021. So far, it has completed successful certification flights on 2/28 at Lake Winnipesauke and 3/20 at Aimsbury. The rocket was designed in Solidworks and funded by AerospaceNU, Northeastern's Aerospace club. The rocket itself is about 70in tall and weighs 8.5lb dry, and achieved an apogee of 1900 feet on an I216 and 1800 on a J285.
Isometric view of the airframe
Airframe cutaway, showing motor tube and electronics bays
OpenRocket model, used to determine fin shape and centers of mass/pressure.
Airframe assembled, prior to painting
The airframe of the rocket is constructed using 4" Blue Tube. The bottom, mid and top tubes are 24, 12 and 16in, respectively. The sections are held together with coupler tubes (left and right of the mid red section), and retained with 2 #4 shear pins. The entire bay is clamped together with two 1/4-20 threaded rods, which also bear the parachute loading.
Above: (left) electronics bay design and (right) assembly in mid tube
Parachute deployment events are controlled by two fully independent Stratologger altimeters. Each are wired through the upper bulkhead to custom 3d-printed blast caps, in which black powder is loaded. This setup provides redundancy, in case one charge is insufficient or one charge doesn't fire.
Above: (left) Matt pictured with Bobby Tables after a successful L2 attempt and (right) bobby Tables fully assembled
