Introduction to high power rocketry Dr Adam M

Introduction to high power rocketry Dr. Adam M Baker

Summary 1. 2. 3. 4. How does HPR differ from model rocketry? Some design guidelines for HPR Something on payloads Examples of HPR • Still images. . . Videos. . . HARDWARE! 5. Amateur rocketry www. ukra. org. uk

HPR v. Model rockets (1)

HPR v. Model rockets (2) • ESTES • Aerotech K 550 W

HPR v. Model rockets (3)

HPR v. Model rockets (4) • Models – Paper – Balsa – Plastic • HPR – Metals e. g. Aluminium – CFRP – Phenolic tubing

HPR v. Model rockets (5) • • Mass, Size Motors Trajectory Materials, components SAFETY

Where can I get help? • UK Rocketry Association • www. ukra. org. uk • Rules, regs , lots of ‘experts’ • ESSENTIAL for launch • Rockets ‘n’ Things – Malcolm Jennings • Main supplier in Southern England for HPR parts • www. rocketsandthings. com

Guidelines For HPR design

Stability (1) – Defined by Barrowman equations – Cp v. Cg, or – ‘Static margin’ http: //my. execpc. com/~culp/rockets/Barrowman. html http: //www. apogeerockets. com/downloads/pdfs/barrowman_report. pdf

Stability (2) • Barrowman – Slender body theory 1. 2. 3. 4. (L/D) between 10 and 35 15 < CN <30 Subsonic flight. ‘Thin’ cross-section fins. • Velocity – Min 20 m/s for fins to act – Or 50 m/s 2 acceleration (4 m launch tower / rail) Þ 6: 1 T: W on launch • Static stability margin - 1. 5 -2. 5 calibres

Launch ramp / tower / rail

Motor mounting

Structure Fin Lat. loading Fin alignment Fin Long. loading

Structure (2) • Coupling sections of rocket

Recovery

Recovery (2) • Redundancy • Test! • Tracking

HPR Payloads

Payloads (1) • Accelerometer / altimeter • Flight computer – E. g. R-DAS – E. g. • G-Wiz • P-Nut Credit: Richard Osborne http: //www. aedelectronics. nl/rdas/

Payloads (2) • Altimeter / recovery • Cameras Credit: Richard Osborne ‘Go. Pro. com’ video cameras

Payloads (3) Credit: Richard Osborne

Examples of HPR

Aspire. Space, ASRV-1 a Thetford 1997 K-class motor , 1250 Ns 2. 1 m long, 100 mm diam. 5000 ft apogee

BURT Bristol Uni Rocket Team 1999 NRC runner-up

2000 Teams from • Manchester (UMIST) • Kent • Kingston

M. A. R. S. 2000 USA 25, 000 ft, a UK record

‘Amateur’ rocketry

Aspire. Space, Comer (Scotland) & Lincs 2001, 2002

Garvey Aerospace www. garvspace. com Mojave, USA, 2005

Flometrics / San Siego State University www. flometrics. com Mojave, USA, 2005

Recap 1. 2. 3. 4. How does HPR differ from model rocketry? Some design guidelines for HPR Something on payloads Examples of HPR • Still images. . . Videos. . . HARDWARE! 5. Amateur rocketry 6. Who can help? – www. ukra. org. uk

October 28 th, 2021