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  1. #61
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    5th August 2015
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    Quote Originally Posted by rockets View Post
    Those are some small fins! The rocket looks good so far,
    When do you plan to launch this? When you do, make sure to post some pics & some vids if you can!!
    Thanks,
    I plan to launch in September. The nose cone is going to be weighted with 35 grams of tungsten so it should be stable

    trffan has been retired

  2. #62
    Join Date
    18th January 2009
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    Savannnah, Ga
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    Quote Originally Posted by TRFfan View Post
    UPDATE; Recieved body tube and fins from carolina composites. I roughed up the body tube a bit to help the fins get a better grip of the surface. I still have to get the proline 4500 (its out of stock right now) and syringes. If i can get someone to redesign my fin guides i can have them tacked on to the body tube soon.

    Attachment 316015
    You can use JB Weld for fillets. It will be fine on this. You could have saved yourself all that money & hassle, if you got your guides from CC. I think he charges 20.00 for a set. Since he made the tube and fins....guides would be a perfect fit. [ so is his 6 -1 cone]





    Quote Originally Posted by TRFfan View Post
    I would guess around 45 degrees.
    The bevel is close to 10 degrees.


    Good luck on your flight.

    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 !!!

  3. #63
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    5th August 2015
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    Quote Originally Posted by blackjack2564 View Post
    You can use JB Weld for fillets. It will be fine on this. You could have saved yourself all that money & hassle, if you got your guides from CC. I think he charges 20.00 for a set. Since he made the tube and fins....guides would be a perfect fit. [ so is his 6 -1 cone]









    The bevel is close to 10 degrees.


    Good luck on your flight.
    I was thinking like this.

    Attachment 316106

    I didnt know he had guides.

    And yeah i will try JB weld.
    trffan has been retired

  4. #64
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    14th July 2015
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    Randolph, NJ
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    Quote Originally Posted by rockets View Post
    Those are some small fins! The rocket looks good so far,
    When do you plan to launch this? When you do, make sure to post some pics & some vids if you can!!
    Thanks,
    Gonna be hard to catch that on camera, seems likely to teleport outta there. Should be interesting!

  5. #65
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    5th August 2015
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    Yeah according to OR the max acceleration is 854 m/s.
    trffan has been retired

  6. #66
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    Ok, now that you can edit posts again, i updated the introduction.
    trffan has been retired

  7. #67
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    5th August 2015
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    Fin guide shipped. Should be here in a few weeks. In the meantime I'll try to get the JB weld and 5 minute epoxy next time im in town.
    trffan has been retired

  8. #68
    Join Date
    27th December 2014
    Location
    Seattle, WA
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    809
    You've probably looked at this already, but you might get a higher altitude off of the G65 longburn motor. It's a hair more N-s and you'll lose less to drag from high speed. Of course, if you want altitude plus a couple of Machs, then the G150 makes a lot of sense.
    NAR L1 "Cheeto Dust", scratch 54mm, H54R (before it became a G54), Mansfield, WA
    L2 "Arc Light", Madcow 2.6" Arcas, J285CL, Mansfield, WA, recovery by snowshoe

  9. #69
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    5th August 2015
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    Quote Originally Posted by boatgeek View Post
    You've probably looked at this already, but you might get a higher altitude off of the G65 longburn motor. It's a hair more N-s and you'll lose less to drag from high speed. Of course, if you want altitude plus a couple of Machs, then the G150 makes a lot of sense.
    From the original post;
    Quote Originally Posted by TRFfan View Post


    Out of the Pro24 6 grain motors the G150 was picked to be the propulsion system for this rocket. Most other motors in the Pro24 6G case offered less impulse than the G150 except for the G117 and G65. The G65 offered a longer burn time as well as more impulse but the offset core produces stability issues and weathercocking....................

    trffan has been retired

  10. #70
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    27th December 2014
    Location
    Seattle, WA
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    809
    Quote Originally Posted by TRFfan View Post
    From the original post; [/RIGHT]
    Derp. Reading comprehension fail. Fair point about the offset core.
    NAR L1 "Cheeto Dust", scratch 54mm, H54R (before it became a G54), Mansfield, WA
    L2 "Arc Light", Madcow 2.6" Arcas, J285CL, Mansfield, WA, recovery by snowshoe

  11. #71
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    7th August 2011
    Location
    Penfield, NY
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    1,274
    Quote Originally Posted by TRFfan View Post
    Out of the Pro24 6 grain motors the G150 was picked to be the propulsion system for this rocket. Most other motors in the Pro24 6G case offered less impulse than the G150 except for the G117 and G65. The G65 offered a longer burn time as well as more impulse but the offset core produces stability issues and weathercocking. The G117 has a longer burn time and just 1 less newton/sec of impulse than the G150 but the G150 has more ISP and less weight and so produces better performance.
    Why not the G-65? same total NS, but a longer burn rate puts this at a higher altitude and the roughly same speed when your motor burns out.
    Evan Brown
    NAR# 92851, TRA# 14596, Level 3

    I don't brag...but I DO state the facts.

  12. #72
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  13. #73
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    Quote Originally Posted by EeebeeE View Post
    Why not the G-65? same total NS, but a longer burn rate puts this at a higher altitude and the roughly same speed when your motor burns out.
    Never mind...answered earlier. Although to prevent weather cocking you could go off a 10' rail instead of 8'.
    Evan Brown
    NAR# 92851, TRA# 14596, Level 3

    I don't brag...but I DO state the facts.

  14. #74
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    15th October 2016
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    Huntsville AL
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    Quote Originally Posted by TRFfan View Post
    I was thinking like this.

    Attachment 316106

    I didnt know he had guides.

    And yeah i will try JB weld.
    Unless I'm missing something, That doesn't look like 45 degrees.
    "I'm at least 70% confident about whatever I say (90% of the time)"- college me

    NAR 101195
    Level 1: Big SAM, 9/10/16

  15. #75
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    25th October 2016
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    Texas, United States
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    I think he meant 4.5

  16. #76
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    Quote Originally Posted by Nytrunner View Post
    Unless I'm missing something, That doesn't look like 45 degrees.
    Sorry, i didnt draw that correctly.
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  17. #77
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    Fin guide came in today.
    trffan has been retired

  18. #78
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    I will get some pics up later.
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  19. #79
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    Ok, i tacked the fins on with CA but the rocket slipped from my hands and now the tip of one fin is chipped a little. What should i do?

    Attachment 316700Attachment 316701Attachment 316702
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  20. #80
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    Also planning to get this for fillets.

    http://www.homedepot.com/p/J-B-Weld-...65-s/100189012
    trffan has been retired

  21. #81
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    30th January 2016
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    US > OK > NE
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    Sand 'em all even. If dropping from the hand chipped it, the air-at-speed or landing would have done the same.

  22. #82
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    So just chip all the fins?
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  23. #83
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    13th June 2014
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    Quote Originally Posted by TRFfan View Post
    So just chip all the fins?
    Sand the other fins so they are the same as the chipped fin. You can probably clean up the chipped fin with some sand paper too.
    Tim
    L3 NAR 98225

  24. #84
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    Quote Originally Posted by timbucktoo View Post
    Sand the other fins so they are the same as the chipped fin. You can probably clean up the chipped fin with some sand paper too.
    oh ok. Ill try it tomarrow.
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  25. #85
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    27th November 2011
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    Quote Originally Posted by TRFfan View Post
    Ok, i tacked the fins on with CA but the rocket slipped from my hands and now the tip of one fin is chipped a little. What should i do?

    Attachment 316700Attachment 316701Attachment 316702
    I would just round off all the tips with some sandpaper. It's looking good!
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  26. #86
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    27th December 2015
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    Hailey, ID
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    Did you prep the fins and tube surface for your adhesive? The root of the fin is usually attached with adhesives similar to your fillets. A good bond at the root lends to a much stronger fin attachment. Areas where adhesives are used are masked off and roughed up with sand paper. Fin installation instructions for the Blackhawk on the Wildman website are very good.
    NAR Member
    Class D water rocket world record 417 feet 130 mph..
    Machbuster #8 Mach 1.71 on a G80 5260 feet.
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  27. #87
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    Quote Originally Posted by retortec View Post
    Did you prep the fins and tube surface for your adhesive? The root of the fin is usually attached with adhesives similar to your fillets. A good bond at the root lends to a much stronger fin attachment. Areas where adhesives are used are masked off and roughed up with sand paper. Fin installation instructions for the Blackhawk on the Wildman website are very good.
    Yeah, i did rough it up the body tube a little. The fins were tacked on with CA. Anyway, i sanded the tips of the fins so that they would all be equal. Here are pics of all the sides and a mockup (this isnt the nosecone i will be using).

    Attachment 316707Attachment 316708Attachment 316709Attachment 316710Attachment 316711
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  28. #88
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    13th June 2014
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    Dang man! You used more than a little CA to tack those on! Probably would be best to tack on with JB Weld. Like retortec said, you need to rough up the fins and airframe where ever you are applying your fillets. I'd definately clean up that CA!
    Tim
    L3 NAR 98225

  29. #89
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    Quote Originally Posted by timbucktoo View Post
    Dang man! You used more than a little CA to tack those on! Probably would be best to tack on with JB Weld. Like retortec said, you need to rough up the fins and airframe where ever you are applying your fillets. I'd definately clean up that CA!
    Ok i snapped them off.
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  30. #90
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    27th December 2015
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    Hailey, ID
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    Take your time! You have invested a lot of time on a good design. You invested a bunch of money in great parts. Why not maximize you investment with good assembly techniques. A great assembly can yield unexpected performance. All your research and enthusiasm proves finishing it off great is well within your capabilities.

    NAR Member
    Class D water rocket world record 417 feet 130 mph..
    Machbuster #8 Mach 1.71 on a G80 5260 feet.
    NAR Member

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