introduction to high power rocketry
DESCRIPTION
Introduction to high power rocketry. Dr. Adam M Baker. Summary. How does HPR differ from model rocketry? Some design guidelines for HPR Something on payloads Examples of HPR Still images... Videos...HARDWARE! Amateur rocketry www.ukra.org.uk. HPR v. Model rockets (1). - PowerPoint PPT PresentationTRANSCRIPT
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Introduction to high power rocketry
Dr. Adam M Baker
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Summary
1. How does HPR differ from model rocketry?2. Some design guidelines for HPR3. Something on payloads4. Examples of HPR
• Still images... Videos...HARDWARE!5. Amateur rocketry
www.ukra.org.uk
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HPR v. Model rockets (1)
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HPR v. Model rockets (2)• ESTES • Aerotech K550W
Total Impulse 1595 (Ns) Maximum Thrust 845 (N) Average Thrust 467 (N) Burn Time 3.42 (s) Loaded Mass 1.51 (kg) Propellant Mass 0.88 (kg)
Total Impulse 5 (Ns) Maximum Thrust 12 (N) Average Thrust 6 (N) Burn Time 0.85 (s) Loaded Mass 0.018 (kg) Propellant Mass 0.065 (kg)
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HPR v. Model rockets (3)
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HPR v. Model rockets (4)
• Models– Paper– Balsa– Plastic
• HPR– Metals e.g. Aluminium– CFRP– Phenolic tubing
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HPR v. Model rockets (5)
• Mass, Size• Motors• Trajectory• Materials, components
SAFETY
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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
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Guidelines
For HPR design
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Stability (1)
– Defined by Barrowman equations
– Cp v. Cg, or – ‘Static margin’
http://my.execpc.com/~culp/rockets/Barrowman.htmlhttp://www.apogeerockets.com/downloads/pdfs/barrowman_report.pdf
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Stability (2)
• Barrowman– Slender body theory
1. (L/D) between 10 and 35
2. 15 < CN <303. Subsonic flight. 4. ‘Thin’ cross-section fins.
• Velocity– Min 20m/s for fins to act– Or 50m/s2 acceleration
(4m launch tower / rail)Þ6:1 T:W on launch
• Static stability margin- 1.5-2.5 calibres
CENTREOF
MASS
CENTREOF
PRESSURE
1.5D<STATIC MARGIN<2.5D
L
D
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Launch ramp / tower / rail
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Motor mountingTotal Impulse 1595 (Ns) Maximum Thrust 845 (N) Average Thrust 467 (N) Burn Time 3.42 (s) Loaded Mass 1.51 (kg) Propellant Mass 0.88 (kg)
NUT
FIREWALL
MOTOR CASE
FORWARD BULKHEAD
CLAMP1.2.
FIN
MOTOR THRUST RING
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Structure2° MAX LONGITUDINALAXIS
TEST FORCE=2 x FIN MASS x MAX ACCELERATION
d
LAUNCH WEIGHT OF ROCKET
S
d < S x tan 10°
z
x
Z/X< 1%
CENTREOF MASS
Fin alignment
Fin Long. loading
Fin Lat. loading
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Structure (2)
• Coupling sections of rocket
METAL
PLASTICSor
COMPOSITE
CONNECTING BODY TUBES
1/2 D
D
D
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Recovery
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Recovery (2)
• Redundancy
• Test Test Test!
• Tracking
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HPR Payloads
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Payloads (1)
• Accelerometer / altimeter– E.g.
• G-Wiz• P-Nut
• Flight computer– E.g. R-DAS
http://www.aedelectronics.nl/rdas/
Credit: Richard Osborne
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Payloads (2)
• Altimeter / recovery • Cameras
Credit: Richard Osborne
‘GoPro.com’ video cameras
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Payloads (3)Credit: Richard Osborne
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Examples of HPR
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AspireSpace, ASRV-1aThetford1997K-class motor , 1250Ns2.1m long, 100mm diam.5000ft apogee
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BURTBristol Uni Rocket Team1999NRC runner-up
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2000Teams from • Manchester (UMIST)• Kent• Kingston
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M.A.R.S.
2000
USA
25,000ft, aUK record
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‘Amateur’ rocketry
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AspireSpace, Comer (Scotland) & Lincs2001, 2002
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Flometrics / San Siego State Universitywww.flometrics.com Mojave, USA, 2005
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Recap
1. How does HPR differ from model rocketry?2. Some design guidelines for HPR3. Something on payloads4. Examples of HPR
• Still images... Videos...HARDWARE!5. Amateur rocketry6. Who can help?
– www.ukra.org.uk
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October 28th, 2021