The YP rocket, just before launch



YP (YoPeeps101) was the first rocket ever designed, built, tested, and launched by SFSA. It was built in May of 2014, and its purpose, being SFSA’s first rocket, was to test the basic design of a rocket. YP also currently holds the SFSA Rocket Endurance record for being launched the most times in its operational lifetime, with 6 consecutive flights on record. YP has not yet been retired, but will be rendered obsolete by new rockets currently being built.





Flight Records

Flight 1

On May 31, 2014, at 10:22 A.M., YoPeeps101 Mark I was launched at Yankton Trails. At the time of the launch, winds were blowing gently North West. When YoPeeps101 was launched, the rocket accelerated to it’s maximum speed in about 0.3 seconds. YoPeeps101 was using a C6-7 engine, which has a thrust time of 1.85 seconds. Seconds after the ignition of the engine, YoPeeps101 Mark I was close to the apoapsis of it’s flight. Several meters below to apoapsis, YoPeeps101 started to spin to the right on the yaw axis, for an unknown reason. Fortunately, the spinning stopped soon after. The delay for the back charge took longer than expected; about 2 seconds. When the delay finished, the back charge popped the nose cone of the rocket off. The streamer, that was supposed to have enough drag for the rocket to come to a safe recovery speed, didn’t unravel. Although without the recovery streamer, YoPeeps101 Mark I crashed into the surface with significant speed. When the rocket was recovered, it turned out that the recovery wadding, which was a piece of tissue paper, had failed it’s purpose. The end of the roll of streamer was melted together before it had be ejected, and was also melted off from the elastic band that it and the nose cone to the fuselage of the  rocket. When the  YoPeeps101 Mark I landed on the surface, there was no damage done to the rocket, except for the failure in the drag streamer. Once  the YoPeeps101 Mark I  gets a new drag streamed, YoPeeps101 Mark I will be ready for another flight.

YoPeeps101 Mark I Specifications

Height 40.1 cm.
Weight (Loaded for launch) 3 ounces
Diameter 2.5 cm.
Engine Size Standard (18 mm.)
Typical Engine C6-7


Flight 2

Records unavailable


Flight 3

On July 29, 2014, YoPeeps101 was flown on its 3rd flight. YoPeeps101 holds the rocket endurance record.  When YoPeeps101 was launched, the crew member aboard was Jim Smith.  He had the M2 parachute on. YoPeeps101 was also testing several things. First, it was testing what would happen with 2 smaller parachutes on a rocket instead of 1 large parachute. Also, YoPeeps101 was testing what would happen if there are swivel pieces connecting the strings of the parachute to the shock cord, instead of just having them glued to it. After YoPeeps101 was launched, the rocket accelerated very quickly. After traveling very high, the back charge of YoPeeps101 was activated. Jim Smith was jettisoned. Smith’s M2 parachute was too slow, so from the high altitude that he was at, he was not able to be found. Unfortunately, parachute 1 of YoPeeps101 was burned off, and the strings were melted together. Even without the first parachute, YoPeeps101 was still able to come down at a safe and recoverable speed. Although, Parachute 1 was burned off, Parachute 2’s swivel piece helped significantly. None of the strings were tangled, and the parachute fully deployed.

Flight Outcome: Failure


Flight 4

On November 28, 2014, YoPeeps101 was launched for the 4th time. YoPeeps101 was holding the rocket endurance record already, but now increased the gap. YoPeeps101 had a small capsule in its fuselage, which was to be jettisoned when the parachute is deployed. Inside was a small banner that said “Sioux Falls Space Association” on it. The capsule had a drag streamer to slow it down a bit.

Moments after the launch of YoPeeps101, the rocket shot off of the launch pad. A few seconds after launch, the engine stopped burning, and the rocket was now coasting. At apogee, base off of our basic calculations, YoPeeps101 was at an altitude of 90.6 meters, although that was just off of the numbers that we could gather which were not the most accurate. A few moments after apogee, YoPeeps101 decoupled the nose cone, and the capsule was successfully jettisoned. YoPeeps101’s parachute didn’t open all the way though, causing it to break the tip of one of its fins. After examining the parachute, there were small burns, so a melted parachute could have been the problem, although after some research was done, it turns out that this type of parachute doesn’t work as well when the temperature is less than 4.4 degrees.

Flight Outcome: Success


Flight 5


On March 8, 2015, YoPeeps101 was launched for the 5th time. YoPeeps101 had only one test on it at the time, which was to test the altimeter. This reading would be compared to the measurements from the ground which was the following. The reading of the angle was taken 20 meters from the launch pad, and we got an angle of 89 degrees. We think that this was an incorrect measurement, because at this angle, we would get an altitude of 1145.8 meters, which is much higher than any other rocket that we have ever had, and a flight of more than 1 kilometer is a very high flight.

When we launched YoPeeps101, we had the altimeter inside of it. We must have not set the altimeter to the correct settings, since the altimeter read “0 meters” when the flight was finished. Since this was the only test aboard YoPeeps101, this flight was considered a failure.

Overall Flight Outcome: Failure


Flight 6

On April 25, 2015, YoPeeps101 was launched for the 6th time. Since this was the 6th flight, YoPeeps101 will need to to undergo the Rocket Maintenance Law. YoPeeps101 was being launched for one reason, like the last flight, which was to get the altimeter to work. After looking over the instruction manual, we thought that we would be able to make it work. However, when YoPeeps101 landed, we discovered that the altimeter didn’t show any data. Instead, it showed “0 meters.” This was the same thing that it showed on the 5th flight. This shows that there must be a very thorough reading of the instructions, since it costs money for each flight.

YoPeeps101 was in flight for 31.95 seconds. The maximum altitude is estimated to be around 59.585 meters. This is a moderately high flight. One thing that we will consider focussing on is making large rockets, and increasing the altitude achieved of the rocket.

Overall Flight Outcome: Failure