Saturday, April 7, 2012

The incredible rockets of XPRS

Barely through level 1 rocketry, and slowly working towards level 2, it is still fun to dream about what could be, some day. These XPRS blogspot pages show many large hpr rockets, some of which are designed for extreme performance. Here is a sample:

Team: Mike Yamamoto & Bill Inman
Club: AeroPAC
Altitude: 30k'
Motor: L330 (pending TMT approval)

Project Goal: TRA L record. This is the third attempt at the L record following on heals of last year's L600 motor flight. Last L600 flight had serious fin flutter that erased about 5,000 feet. Lesson learned: if it looks too thin, then it probably is!
Project Note: Actual rocket is the little fat guy on the left (just kidding)

Member: Gene Engelgau
Club: AeroPAC, Lunar
Altitude: 15,300
Motor: I59NP, I600R
Project Goal: : Dark Energy is an all-carbon precision 38mm rocket. It is 36" long and weighs just 15oz fully loaded but without motor. It's designed to hold a 38/1040 case plus a single small Fruity Chute, Feather Weight Parrot altimeter and a BRB tracking beacon. Current flights have been spectacular with tremendous acceleration and straight as an arrow flights. The most recent flight at August TCC where DE went to 11740' using a I435T. It hit Mach 1.7 and the accelerometer was maxed out at 92G.
Originally this was to go for the J altitude record, but that may that difficult. But the current I Record listed on TRA website by William Inman seems in reach. An I59 should break 15K'. I'll also try a I600 to see how high I can get using it, and how fast.

Member: Curt von Delius
Club: AeroPAC
Motor: M1450W
Altitude: 57,000'
Project Notes: The Falcon flying on and KBA/AEROTECH M1450W suffered an R.U.D. event early in it's flight (RAPID UNSCHEDULED DISASSEMBLY).

Both flight computers indicated a max velocity of 3489 fps or Mach 3.2083 at

4296 feet when a fin failed due to extreme aerodynamic heating. The velocity graph on the RDAS showed that it was still accelerating at 16.2 gees when the fins came off at 3.75 seconds. The RDAS also reported that the Falcon achieved a maximum acceleration of 32.3 gees at 1.89 seconds.

Member: William Earls
Club: Oregon Rocketry (OROC)
Motor: CTI I540
Altitude: over 11,000
Project Goal: I Class Motor Altitude Record Extreme Altitude Contest

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