Eight team members
traveled to the Maryland launch site on Saturday, November 21, to
practice the launch process and again test streamer
recovery. It was a cool cloudy day, but with very little wind. We
used both launch rails and launched three different boosters. We
started the day by launching five small rockets that the new members
had built back in October. It only took us a half hour to
ready, launch, and recover the last rocket of the day.
Objectives
- Introduce new members to the launch
process, including the launch rails.
- Launch our recently built boosters.
- Check out the performance of the
E30-4s purchased from the AeroTech store.
Lessons
- The E30-4 will not lift 400g to 825
ft, it also appears to eject before apogee.
- Two 7x70in unmodified streamers don't
create enough drag. The stick in the leading edge helps but we
need to do much more.
- The cargo unit descended nose down
and the streamers deployed close to each other even though we made
the cargo unit longer. We may want to try moving the egg in
between the streamers.
- The F24-4W easily lifted the 419g
rocket to 900 ft. We need to work on a technique to
incrementally add weight to the middle of the rocket (perhaps in the
booster).
- Even though the wind was light,
there was some cocking into the wind. We need to adjust the
launch rail angle as the wind changes.
- Rocket Names: Green = Frankenlime, Orange = Firebird, Red = Ronald
Launches
Rocket |
Engine |
Cargo |
Cargo Recovery |
Booster Recovery |
Weight |
Results |
Comments |
Green
(test 1) |
E30-4W |
egg,
altimeter F |
2-7x70 streamers with sticks |
4x40 streamer |
417g |
770ft, 30sec
(video) |
Nice flight, booster came down too
fast, cargo egg broke. |
Orange
(test 1) |
E30-4W |
egg,
altimeter F |
2-7x70 streamers without sticks |
6x60 streamer |
409g |
670ft, 23sec
(video) |
Nice flight, some wind cocking, streamers deployed
nicely. |
Red
(test 1) |
E30-4W |
egg,
altimeter G |
2-7x70 streamers with sticks |
4x40 streamer |
421g |
620ft, 28sec
(video) |
Swirling ascent, one streamer hung up
and slowed descent. |
Green
(test 2) |
F24-4W |
egg,
altimeter G |
2-7x70 streamers with sticks |
6x60 streamer |
419g |
907ft, 34sec
(video) |
Nice flight, almost had a
valid score. |
Altimeter Data
(Excel format)
Pictures
|