Explorer Post 1010
Lockheed Martin Exploring Program
Launch - February 27, 2010
 
Twelve members traveled to a new launch site at Dean Elementary School in Manassas, VA on Saturday, February 27.  This was our first attempt to qualify for TARC 2010.  It was partly sunny, temperature around 45 F, and wind about 10mph.  The field was very snowy, icy, and muddy.  We used both launch rails and had several NAR members observe and time the launches.

We had relatively good results.  The biggest problem was the crash of team 8189's green rocket.  We did recover most of the rocket and parts.  The best results was the qualification score of 17.35 for team 8186 and their black/white rocket.  Teams 8188 and 8296 need to work on delaying descent a little more.  We are now ready to do more qualification launches in March.

Thanks to all the parents and NAR members.  It has been difficult getting this done in February.

          

Objectives

  • Each team was launching one test flight and then one qualification flight.
  • All the streamers had been ironed with starch.
  • We tried to use a tube to sight the camera on the descending rockets.
  • Teams 8186, 8188, and 8189 assembled their F24-4W motors on Wednesday, February 24.

Lessons

  • We had two launches that lasted beyond 40 seconds, perhaps due to thermals rising from the field.
  • Team 8189's failed ejection charge needs to be examined.
    (We looked at the motor on Wednesday, March 3 and discovered there was very little black powder in the red ejection cap.  It either fell out when being assembled, or there was very little in it from the manufacturer.  In either case, we need to check the remaining assembled F24 and any future ones when we assemble them.)
  • Team 8188 had the best descent rate around 46 seconds, but we are not sure why - perhaps a rising thermal..
  • We angled the rails about 5 degrees with the wind to reduce cocking into the wind.
  • For the ill-fated green rocket we straightened up the rail so there would be more wind cocking.  We tried to reduce the height because we thought the rocket might be too light (413g).  It only went 799 feet, so maybe we didn't need to.
  • We did better with the igniters - no failed igniters.
  • We believe the booster recoveries were all acceptable.
  • Zooming in with the camera on the descending rockets is still a problem.  We don't have good video of the deployments.

Suggested Tasks

  • Team 8186:  You had a great score.  You nailed the altitude with two flights inside the accuracy of the altimeter.  You should try more qualification flights and maybe help the other teams.
     
  • Team 8188:  You may want to rework the yoke to hold another streamer.  You should rework the altimeter holder.
     
  • Team 8189:  You have to rebuild your rocket.  This time, try to get down around 380g with a lighter booster.  You can then use the E30 instead of the F24.  The E30 has a built in ejection charge.
     
  • Team 8296:  You seem to have a little stability issue, most likely because of the weight distribution in the long cargo unit.  You also need to work on the streamer deployments to delay descent more.  You may want to try an F39-6T to coast a bit more before deployment.

Launches

Team Rocket Engine Cargo Cargo Recovery Booster Recovery Weight Results Comments
8186 Black
test 1
F24-4W egg,
altimeter G
2-7x70  streamers sticks, pleated 10' Xchute 430g 822ft, 33sec
(video)
Nice flight, streamers deployed nice
8186 Black
test 2
F24-4W egg,
altimeter G
2-7x70  streamers sticks, pleated 10' Xchute 431g 826ft, 36.7sec
(video)
Nice flight
Qualification Score 17.35
8188 Orange
test 1
F24-4W egg,
altimeter H
2-7x70  streamers sticks, pleated, yoke Connected 438g 876ft, 46sec
(video)
Nice flight, streamers/yoke deployed nice
8188 Orange
test 2
F24-4W egg,
altimeter H
2-7x70  streamers sticks, pleated, yoke Connected 455g 822ft, 33.8sec
(video)
Nice flight
Disqualification - time
8189 Green
test 1
F24-4W egg,
altimeter I
2-7x70  streamers with sticks, pleated 10' Xchute 413g 799ft, 15sec
(video)
Crash, ejection charge failed
8189 Red
test 1
E30-7T egg,
altimeter C
2-7x70  streamers sticks, pleated, threads 6x60 streamer 365g 859ft, 41sec
(video)
Nice flight, egg broke
Disqualification - egg
8296 Blue
test 1
F32-4T egg,
altimeter F
2-7x70  streamers with sticks, pleated Connected with 4x40 streamer 618g 763ft, 34sec
(video)
Nice flight, streamers deployed nice
8296 Blue
test 2
F32-4T egg,
altimeter F
2-7x70  streamers with sticks, pleated Connected with 4x40 streamer 593g 754ft, 33.8sec
(video)
Squirrely flight
Disqualification - time

Altimeter Data (Excel format)

Pictures
 Team 8186                     Team 8188                      Team 8189                    Team 8189 (backup)          Team 8296
            
Launch site
Preparation table
Ready
Looking up
Bob looking for something
Launch controls from 1995

Copyright 2010 Lockheed Martin Exploring Program
Updated: March 4, 2010