Raceday 2017
April 21-22
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Yama Bachi - SN

Yama Bachi - SN Yama Bachi

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  • the historian pope on 2016-Apr-21 19:48:26 the historian pope said

    Connor,

    In the broadcast, you spoke of buggies of the 80s as being heavy and made from aluminum we found in the street. This buggy, yamabachi, was built in 85. Thus, it predated Spirit's QL ( a great if slightly heavy buggy) by a few years. It was made from carbon fiber pre-preg, vacuum bagged and cured in an oven of our own construction. ( and no one knew where their space heaters went) It was well under 50 lbs and was able to get under 2:20 as a B-team buggy. The latter is a feat that eludes some "good" carbon fiber buggies built in more recent times. If you ignore the big wheels, it might remind you of recent pka buggies.
  • seems to me on 2016-Apr-21 21:17:53 seems to me said

    that connor knows nothing
  • chayes on 2016-Apr-21 21:34:07 chayes said

    always thought this was a gorgeous buggy; cool to learn it was straight carbon fiber and not frame on shell like colugo
  • the historian pope on 2016-Apr-21 22:20:42 the historian pope said

    thanks chayes.

    The pope and yamabachi had some design issues wrt to mounting the wheels to the buggy that held them back in the end. the aluminum frames were a bit heavier (due to the non-structural shells ) but you could mount stuff to them solidly and weld stuff back on when it broke off. Lemur being the first was stout. Colugo was lighter and faster but suffered from a poor wheelbase design. It was spin or win with that beast. Jerboa was lightest of the frame and shell designs, which may have pushed it too far. as it had some flex issues. Jerboa's design was a hybrid. Carbon and nomex pan (leftovers form yamabachi) with aluminum above deck and marginally structural shell with glass and carbon. I did her as my sr design project. one of my few good grades at CMU.

    Jama was the last of the aluminum truss buggies we built. The cook did the design and most of the work. later the zoo used the mold for her 2nd shell as the basis for KOS and a few more. Those were really light when young and got heavier as they aged and were repaired. I recall a really fun race against spirit A where the underdog zoo pushers, with a much lighter KOS, matched spirit with QL up and over resulting in the buggies locking together at the crosswalk. I was in the lead car, filming. I lost my voice.

    good times

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