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Thread: Nose cone tip

  1. #1
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    Nose cone tip

    Howdy, does anyone know a ratio for nose cone tips? Nose cone dimensions: Length- 38 inches , Diameter- 7.74 inches


  2. #2
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    Ratio....ratio..... what kind of ratio?

    L/D of the tip?

    Tip length over cone length?

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    Quote Originally Posted by Nytrunner View Post
    Ratio....ratio..... what kind of ratio?

    L/D of the tip?

    Tip length over cone length?
    I am trying to figure out how long the nose cone tip should be. I didn't know if there was a ratio or something to find how long the tip should be.

  5. #5
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    Quote Originally Posted by noah_carter13 View Post
    I am trying to figure out how long the nose cone tip should be. I didn't know if there was a ratio or something to find how long the tip should be.
    Maybe a picture of what you want. We still do not know what it is you are asking. Are you talking about the metal tips on FW cones that are commonly used? Maybe you can use this pic to help describe the question.


    NC info.....

    http://s605282183.onlinehome.us/wp-c...timization.pdf
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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    Last edited by Titan II; 12th February 2018 at 08:31 PM.

  6. #6
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    Quote Originally Posted by noah_carter13 View Post
    I am trying to figure out how long the nose cone tip should be. I didn't know if there was a ratio or something to find how long the tip should be.
    It depends on the shape of the nose you want. A VK shape will have a very different tip than a conical, ogive, etc. What is the final shape you're looking for?
    Tripoli #15629 NAR #218710
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  7. #7
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    The nose cone tip is to ease manufacturing and so the point doesn’t break off on landing.
    Make it however long you want.

    M

  8. #8
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    Measure the angle of the FG cone where the tip is supposed to fit and then turn the tip with the same angle.
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  9. #9
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    Quote Originally Posted by MClark View Post
    The nose cone tip is to ease manufacturing and so the point doesn’t break off on landing.
    Make it however long you want.

    M
    Also to add weight where you most want it, no?

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  10. #10
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    Quote Originally Posted by Bat-mite View Post
    Also to add weight where you most want it, no?
    The difference between aluminum and solid fiberglass is little.

  11. #11
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    The nose cone tip is to ease manufacturing and so the point doesn’t break off on landing.
    Make it however long you want.
    What he said.
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  12. #12
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    I believe that the separate tip is mostly due to the filament wound manufacturing process. It does allow for easy attachment of eyebolts and nose weight.

    Dan Feller
    Silver Crest Rocket Club

  13. #13
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    Plus it takes heat well at a point of great aerodynaimc heating

  14. #14
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    Quote Originally Posted by Barkley View Post
    It depends on the shape of the nose you want. A VK shape will have a very different tip than a conical, ogive, etc. What is the final shape you're looking for?
    Conical

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    Quote Originally Posted by Nytrunner View Post
    Plus it takes heat well at a point of great aerodynaimc heating
    Yes, we need the tip to take on the aerodynamic heating and for structure. Mainly the heating. Max velocity ranges from 2.7 - 3.12 mach (still designing).

  16. #16
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    Quote Originally Posted by noah_carter13 View Post
    Yes, we need the tip to take on the aerodynamic heating and for structure. Mainly the heating. Max velocity ranges from 2.7 - 3.12 mach (still designing).
    How long of a cone do you need ? Will it be a 4:1 , 5:1 , 6:1 , 7:1 ? If your desiging the tip to handle the heat , the length of the cone will dictate the length of the tip.
    You must always push your limits , because if you never fail , you will never succeed .

  17. #17
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    Quote Originally Posted by noah_carter13 View Post
    Yes, we need the tip to take on the aerodynamic heating and for structure. Mainly the heating. Max velocity ranges from 2.7 - 3.12 mach (still designing).
    Then Conical is not ideal.
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  18. #18
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    In your First thread about NC design....I gave you a PDF with all the calculations/info needed to make an informed decision.....apparently you did NOT read it...did you?


    http://www.rocketryforum.com/showthr...71#post1759171
    Last edited by blackjack2564; 13th February 2018 at 11:16 PM.
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  19. #19
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    Quote Originally Posted by blackjack2564 View Post
    In your First thread about NC design....I gave you a PDF with all the calculations/info needed to make an informed decision.....apparently you did NOT read it...did you?


    http://www.rocketryforum.com/showthr...71#post1759171
    Ouch.
    Tripoli #15629 NAR #218710
    L1 w/ Fog Hog, scratch built with a CTI H165
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  20. #20
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    Did not mean to seem so...well...mean.

    It was supposed to be sarcasm.
    I was referring to the choice of cone shape, which is defined in my post....
    I have posted many answers over the years to newbies, & so many times they get asked over & over again in different threads, and it's obvious they never read them.
    Jim Hendricksen
    L-3 Tripoli 9693
    [ICBM, Orangeburg,SC R.I.P.] - QCRS ,Princeton ILL - MDRA , Price Maryland - Woosh, Bong Wisconsin- ROCC, Charlotte NC , ICBM Camden SC
    "Made" member of Chicago & Carolina Rocket Mafia
    Rocketry...........an exact science.......but not exactly !!!

  21. #21
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    Quote Originally Posted by 3stoogesrocketry View Post
    How long of a cone do you need ? Will it be a 4:1 , 5:1 , 6:1 , 7:1 ? If your desiging the tip to handle the heat , the length of the cone will dictate the length of the tip.
    5:1 Conical

  22. #22
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    Since your nose come shape is already not optimal for the velocity you hope to achieve I would suggest just rounding off the tip of a conical nosecone. The decreased concentration of heat may make a metal tip unnecessary.
    Or better yet, just fly it as is and replace the tip if it burns off.
    Steve Shannon
    L3CC, TAP, Director, Tripoli Rocketry Association

  23. #23
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    [QUOTE=blackjack2564;1764443]In your First thread about NC design....I gave you a PDF with all the calculations/info needed to make an informed decision.....apparently you did NOT read it...did you?

    I did read it and it was very helpful! We decided to go with a conical nose cone for ease of manufacturing for now, and will continue to research and learn about Von Karman nose cones for the future.


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