Canon PowerShot G9
ƒ/4
7.4 mm
1/800
80

It was a creative idea. Build a minimum diameter carbon fiber rocket around a long M motor, but how to take it further?… ’cause this one goes to 11…

He embedded a K booster motor inside the hollow center core of the M motor! After K motor burnout, it needs to eject free and clear of the M motor, but it got stuck halfway out, just as the M motor came up to pressure… enormous pressure. The metal casing of the M motor ruptured open along most of its length and the carbon fiber splayed apart and became a carbon hair ball. The inner half of the K motor clot disappeared.

7 responses to “Explosive Constipation”

  1. Gotta say that was an impressive ‘flight’!

  2. great tags. always loved the sustained dry thud of kick drum betwixt the breakbeat snares in that track.

    I’m so angry at my… idiotic barber

    Think I’ll stay down here ’til… it grows out a little

  3. ah, yes, and that brings us back to the carbon hairball…

  4. (ROFL @ SJ hairball comment)

    This is a fun/simple/creative idea – obviously a little more work on a dependable casing ejection system is in order. 🙂 Once he works it out, he can go on to nest multiple engines this way – The rocketry equivalent of TurDucken. I think it might be fun to watch his rev 2.0 version lift off.

    The K motor getting stuck has me curious now about casing dynamics – motor OD expansion from thermal soak or pressure deformation, etc. Time to run some static tests!

    (In any event, this seems like a clever variant of the old minimum-weight trick of bonding some fins and a nosecone to an engine casing – unstable as hell, of course… CP/CG all wrong). I’ll have to do some Rocksim work with ultra-light bodies now… hmm

    (Mach 3 here I come!)

  5. Matryoshka engine…

  6. Explosive Constipation: disaster image of motor, well photo to capture it. gutsupport.com

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