xx 12 GRAIN 38MM MOTOR AND ACCESSORIES FOR 54MM MOTOR

Discussion in 'Yard Sale / Wanted' started by DanWalker, Aug 29, 2019.

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  1. Aug 29, 2019 #1

    DanWalker

    DanWalker

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    Wanting to trade this 12 grain fisher research 38mm motor for a 54mm motor in the 1000-1200 Ns class.
    This motor has only been flown once. I will be including the motor liners, casting tubes, and casting hardware that you see in the pic as well. The motor is complete with graphite nozzle and forward closure.
     

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  2. Sep 10, 2019 #2

    DanWalker

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    Bump to top. Cash offers considered. Make me an offer.
     
  3. Sep 12, 2019 #3

    tbonerocketeer

    tbonerocketeer

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    While I'm sure it's an optical illusion, is the case straight? What size nozzle is it?
     
  4. Sep 12, 2019 #4

    DanWalker

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    Yes, the case is straight. I don't remember nozzle size. It came from Fisher with the case.
     
  5. Sep 12, 2019 #5

    tbonerocketeer

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    His site doesn't specify. Any way you can measure it?
     
  6. Sep 13, 2019 #6

    DanWalker

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    Just measured .242" with my calipers.
     
  7. Sep 13, 2019 #7

    jbr

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    24" propellant with a .242 nozzle throat is not right
     
  8. Sep 13, 2019 #8

    swfa

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    My 12 grain Fisher case will actually hold 25.75" of propellant. I think the extra room is for a full diameter tracking smoke grain. I used a 0.390" nozzle both times I fired it. I'm not sure how you could use any smaller than a 0.375" throat.
     
  9. Sep 13, 2019 #9

    jbr

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    my 12 grain case is a K1000 with 0.625 nozzle
    I have to wonder what propellant and grain geometry
     
  10. Sep 13, 2019 #10

    Binder Design

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    Throat diameters are specified by the customer. I checked my records for the specified throat diameter and it looks like it was ordered as a casing and thrust ring only. The original customer was using KNSB, so the throat diameter he used would be smaller than with APCP.
     
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  11. Sep 13, 2019 #11

    jbr

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    Indeed, this is why I asked what propellant was used
     
  12. Sep 14, 2019 #12

    DanWalker

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    OK. Just got home. Been out of town all day. I measured the throat again (with my glasses on this time) and got .342" I obviously misread the micrometer earlier. I flew this case on KNSB with this nozzle. I had no issues with it. Please accept my sincerest apologies. I wasn't trying to mislead anyone about anything. I haven't flown this case in over a year, and I only flew it once, before I found out what I was doing was a violation of FAA regulations, so I quit, and haven't flown the rocket since.
     
    Last edited: Sep 14, 2019
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  13. Sep 15, 2019 #13

    DanWalker

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    Admins, please delete this thread. Item is no longer for sale.
     
  14. Sep 15, 2019 #14

    timbucktoo

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