Estes Bull Pup 12D Build (w/ modifications)

Discussion in 'Low Power Rocketry (LPR)' started by Luzwingnut, Mar 11, 2020.

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  1. Mar 11, 2020 #1

    Luzwingnut

    Luzwingnut

    Luzwingnut

    "Everyday... a new adventure!" TRF Supporter

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    Thought I'd "test" some new building techniques on an old favorite. Wanted to include a motor hook as the original design utilizes a friction setup for motor retention. Additionally, I wanted to try out some "FIX-IT" modeling epoxy and practice doing some fillets between the fins and body. Ive ordered a 12' nylon printed chute...never did like the plastic offerings. The kit BT measured 9 inches long...increased that to 11 inches just to extend the rocket a small bit for CG. Positioned and glued (w/fillets) the small strakes to the nose cone instead of the upper section of the BT...liked the cosmetics better that way. Chopped off the angled molded cone aft section (immediately AFTER the cone's shoulder) to install an eye-screw... but also to assist in putting weight INSIDE the tip of the nose cone. Papered and sanded the fins... THIS is just a "practice" build BEFORE I start putting together my AEROTECH Strong-Arm...and my NorthCoast Rocketry SA-14 Archer.
     

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  2. Mar 11, 2020 #2

    Cape Byron

    Cape Byron

    Cape Byron

    The BAR formerly known as Skippy-2

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    Great kit. I've flown the snot out of mine.
     
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  3. Mar 12, 2020 #3

    Nytrunner

    Nytrunner

    Nytrunner

    Master of Rivets

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    If the strongarm has plastic fins like the other AT offerings, use a better epoxy (30min, heck 5 min) than the clay junk. As far as my observances, the only thing the clay has going for it is it sands easily
    If the Archer has wood fins, use the same epoxy or wood glue
     
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  4. Mar 13, 2020 #4

    Luzwingnut

    Luzwingnut

    Luzwingnut

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    Yep. Plastic fins. Will heed your advice. Thanks!
    (The Archer has wood fins as you correctly have guessed)
     
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  5. Mar 28, 2020 at 6:17 AM #5

    bronicabill

    bronicabill

    bronicabill

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    I built mine stock (just waiting on paint to be applied), but sure wish it had motor hooks instead of a friction-fit motor! Wish I'd seen your post before I got so far along on mine!

    Note to self: Please, feel free to modify existing kit designs as they are NOT always perfect!!! :D
     

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