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XA-1

Specification

  • Length - 702 mm
  • Body Diameter - 34 mm
  • Number of fins - 3
  • Fin Span - 134mm
  • Net Weight - 76 g
  • Maximum Payload  - 15 g
 Engine
 Payload,
g
 Approx. Apogee,
m
 Approx. Max. Velocity,
m/s
 Approx. Max. Acceleration,
m/s/s
 Estes B6-4 077
 37.4 117
Estes B6-4
15
59
31
 99
 Estes C6-5
0
 197 64129
 Estes C6-5
 15170
 55.8110

Design Description

Complete OpenRocket design file is attached at the bottom of this page. 



 
  • Engine tube - Semroc BT-20.
  • 70 mm motor retainer hook is inserted into a slot in the engine tube.
  • 2mm Kevlar cord is attached to motor retainer hook.
  • The hook is fixed to the engine tube  by a piece of tape.
  • One cardboard centring ring (1.5 mm) glued to the top of the motor tube (left).
  • Two rings are glued together.
  • Approx 3mm slot cut in the rings to allow the motor hook bend upwards.
 
  • Motor mount is glued into the booster body tube (Semroc BT-55) in such way that approximately 1.5mm (one of the two glued together centring rings) is exposed.
  • Two cardboard triangles are glued to the motor mount.
 

  • Triangles are to support the rear transition.
 
  • The transition is made of 160g/m.sq card stock.
  • A slot for the motor hook is cut in the transition.
 
  • The transition is glued to the centring ring, triangles and the engine tube.
 
  • Fins are attached.
 
  • The fins are air-foiled and papered.
  • Leading and training edges on each fin are hardened with super glue. 
 
  • Payload bay bulkhead is cut from balsa wood.
 
  • Booster, nose cone and the payload bay.
 
  • The rocket was primed and painted with 4 layers of car paint. This added approximately 5 grams. 
  
 

Launch Log

 Date Motor Ejection Altitude
 WindNotes/ Event
 4/04/2010 Estes C6-5Approx 170 m
approx 5m/s
Successfully recovery
EARS club launch.
5/06/2010 Estes C6-5Approx 130 m
None
Successfully recovery
Big EARS 2010.

Launched with MD80 camera in the payload bay. Our first video:

Launch site from the apogee:


A shot of the horizon:

  • From the video it appears that the rocket rolled 2 times before reaching the apogee.
  • After the parachute deployment the payload bay started revolving around the cord, which decrease quality of the video considerably.
 5/06/2010 Estes C6-5Approx 130 m
None
Successfully recovery
Big EARS 2010.

Launched with MD80 camera in the payload bay.

 20/06/2010 Estes B6-4
 Approx 60 m
 Strong gusts up to 5..7 m/s
Successfully recovery.
SERFS launch.
Launched with the second version of the camera payload bay.
 20/06/2010 Estes C6-5
 Approx 120 m
 Strong gusts up to 5...7 m/s
Successfully recovery. Two parachutes were used.


SERFS launch.
Launched with the second version of the camera payload bay.


 20/06/2010 Estes B6-4
 Approx 120m
 Strong gusts up to 5...7 m/sSuccessfully recovery.
SERFS launch.
Launched without the payload bay. Payload (camera) was placed inside the booster and recovered with a separate parachute. 
 24/10/2010 Estes C6-5
 Unknown Strong gusts up to 5...7 m/sSERFS launch. Successfully recovery. Slight damage to one of the fins probably from ejected launch pad "crocodile" 


Subpages (1): On-board Video
ċ
XA-1.ork
(103k)
The Sky Dart Team UK,
15 Apr 2010, 15:32