Apr 26 1997

　I tested launchinng the 2-stage rocket Wakusei-Shibamoto-8go(P-Shiba-8), but failed.

１．lauch data
　　　I tried to launch Wakusei-Shibamoto-8go(P-Shiba-8).
　　　
timenamepowerconditiondistancealtitude
16:55Wakusei-Shibamoto-8go water 500ml(1st stage):100ml(2nd stage)direction of the wind south0munknown
P-Shiba-8pumping 15times force of the wind middle
direction of launching 　0
angle of launching 90deg


2. phenomenon

    I tried to test of launchinng P-shiba-8.
    Begininng of pumping to the 1st stage, it begins to flow out the water from the joint part.
    Pumping more, all water in the 2nd stage was pushed out.
    Pumping more and more, (after about 15times ponping), suddenly, the 2nd stage was jumped out.

    I tried it again with horizontal stance, but, same phenomenon.

3. cause presumptive

    I think it was too loose between the innner dia of 2nd stage's mouth and the hose.
    When I tested at the ground before, I can't push so much, then it was not discovered, so I think.

4. countermeasure

  (1) To change the pair of the 2nd stage bottle mouth and the hose, not too loose.
  (2) To think about the heart of the persons who tried the early Apollo project, I will try it again.
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If you have any hints about water rocekts, please mail to me.
芝元俊久　Toshihisa shibamoto tsshiba@st.rim.or.jp