Nozzles

Discussion in 'Propulsion' started by gorillamotors, Jul 19, 2019.

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Which do you prefer the nozzle to be made of?

  1. Graphite (Gorilla, AMW, LOKI)

    25 vote(s)
    92.6%
  2. Phenolic (CTI, Aerotech)

    2 vote(s)
    7.4%
  3. Other

    0 vote(s)
    0.0%
  1. Jul 19, 2019 #1

    gorillamotors

    gorillamotors

    gorillamotors

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    Here is a poll to determine which nozzle composition you prefer?
     
  2. Jul 19, 2019 #2

    djs

    djs

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    Relaunching Gorilla motors? :)
     
  3. Jul 19, 2019 #3

    gorillamotors

    gorillamotors

    gorillamotors

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    Not myself
     
  4. Jul 19, 2019 #4

    FredA

    FredA

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    I depends....
    There are times when you want a lower weight, single-use or an eroding orifice you might choose a phenolic nozzle.
    Or, as most do, use a graphite in a re-usable snap-ring system.
    Or some mixed variant in a holder for larger projects.

    So - depends
    Or, "yes" to all.

    What gets the job done, reliably, with good cost/weight/availability?
     
    Dwatkins likes this.
  5. Jul 19, 2019 #5

    jsdemar

    jsdemar

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    What size motor?
     
  6. Jul 19, 2019 #6

    BSNW

    BSNW

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    To answer your question...Graphite
     
  7. Jul 19, 2019 #7

    BSNW

    BSNW

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    I mean high quality Graphite :)
     
  8. Jul 20, 2019 #8

    gorillamotors

    gorillamotors

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    54mm thru 98mm
     
  9. Jul 20, 2019 #9

    3stoogesrocketry

    3stoogesrocketry

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    To the zoo crew , Jim will get that , I would stay old school . Do not change any hardware . You are the only other snap ring motor company . A large selection of the flyers already have GRM hardware or comparable hardware . Keep it classic .

    Eric
     
  10. Jul 27, 2019 #10

    Handeman

    Handeman

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    If I recall correctly, one of the nozzle "manufactures" made a statement on TRF a while back that the lower/mid grade graphite actually made better nozzles and worked better for nozzles than the "high grade" graphite and was cheaper. The reason he didn't make nozzles with the better mid grade graphite was because customers demanded the "high quality" graphite despite the fact it actually made a lower quality nozzle.
     
  11. Jul 27, 2019 #11

    3stoogesrocketry

    3stoogesrocketry

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    100 percent correct. I will let the manufacture speak for himself if he wants.
     
  12. Jul 28, 2019 #12

    jbr

    jbr

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    before I started making graphite nozzles, I bought some that turned out to be large particle and they are very porous
    don't clean one and then use it the same day without thorough drying, the soaked up liquid will flash to steam and explode the nozzle
    I make all mine from iso molded
     
  13. Jul 28, 2019 #13

    3stoogesrocketry

    3stoogesrocketry

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    You should not soak any graphite nozzle, even iso will absorb water
     
  14. Jul 28, 2019 #14

    jsdemar

    jsdemar

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    High density is the most important factor.
    Partical size is second. Medium to fine will go along with density.
    For >98mm or longer burn, isolmolded high density is worth the cost.
    For <98mm and <4-sec burn, moderate density is ok.

    Make sure it is graphite and not molded carbon electrodes. Graphite will be dark gray when rubbed on a surface. Carbon will be black. Carbon is good for maybe one firing.
     
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  15. Jul 28, 2019 #15

    jbr

    jbr

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    not sure why you said that (You should not soak any graphite nozzle, even iso will absorb water)
    my iso never has, maybe yours is different
     
  16. Jul 28, 2019 #16

    rharshberger

    rharshberger

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    I interpret your "soaked up liquid", not as actual immersion/soaking but simply some cleaning fluid absorbed during cleaning. I think some people might/did interpret your statement a bit wrong due to at least one comment following your post.
     
  17. Jul 28, 2019 #17

    jbr

    jbr

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    I don't have any examples to show of the large grain graphite nozzles as they all shattered after 2 or 3 uses, one I have to guess from soaking
    I have iso nozzles that have been fired 15 to 20 times

    take your choice, YMMV
     

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