PrevUpNext

 

WR Home 
General 
Launch Reports 
WR Construction 
Fin Construction 
Altitude Measuremt 
Miscellaneous 
Search & New 
Sitemap 
Links 
Guestbook 
Contact 

 bottom of page

Launch report: Clear FTCs 1 and 2 as Backgliders

Here you find the construction of the CFTC2 rocket.

Nephew Nicolai with CFTC1

My nephew Nicolai with CFTC1, a 3-finner. The payload compartment on the very left with an inner bulkhead.


 Johannes with CFTC2, caught by hand!

Video CFTC2,
caught by hand
(726 KB)

3630 downloads
since 16.10.2002

On an almost windless day, we launched the 4-finned CFTC2. It did not rock up and down as the Backmaxes did, but it spinned quickly around its longitudinal axis. Half by reckoning, half by chance, the little wind we had blew the backgliding rocket exactly to the launch crew. It was caught repeatedly and safely by hand, which was great fun! See the video on the left.

Comparison: plain bottle cap vs. selfmade ogive nose cone
Preliminary Results

On the same day we compared the performance of a

plain bottle cap as a nose cone    vs.   selfmade ogive nose cone.

We filled the CFTC2 rocket with 200ml water and 6 bar air. The rocket was shot with both nosecones 3 times each. Altitude measurement was done with one stop watch and the SEAM method.

 

HSEAM

H rel

tapogee

tdown

plain bottle cap as nosecone

84 m

100 %

3.7 s

15.1 s

styrodur nose cone on cap

90 m

107 %

3.85 s

17 s

The result is not very safe: these values are averages from the 2 closest values in each group - one outlier per group was left out, because of the somewhat high variations.  Eventually I redo these measurements with higher pressures and more samples.

 

PrevUpNext

top of page

Stand / Last Revision:  19.10.02

VisitorsTotal
PageHitsTotal
PageHits since 11.01.2004
.