Scratch Bowling Pin Original Design / Scratch Built

Scratch - Bowling Pin {Scratch}

Contributed by Taylor Jessee

Manufacturer: Scratch
(Contributed - by Taylor Jessee - 07/26/09) (Scratch) Bowling Pin

Brief:
I needed a new rocket t' fly on AT 24mm reloads that wasn't a 29mm rocket. Well, blow me down! When I saw this in me grandpa's garage, I knew this was it. Begad! Blimey! After much searching, shiver me timbers, shiver me timbers, I found that it was sold as a "bowlin' pin sipper cup".

Construction:
T' parts list:

  • 1 Plastic 10" plastic bowlin' pin sipper cup
  • 1 7" piece o' BT-50 tubing.
  • 3 G10 fins (upper canards from a PML Amraam 3)
  • 1 Bamboo Skewer
  • 3' piece o' braided nylon
  • 1 22" nylon parachute
  • 1 2" length o' 1/4-20 all-thread with 2 nuts

I also needed be somethin' dense t' use as nose weight. Avast! Well, me bucko, blow me down! I used "epoxy paste"

(Scratch) Bowling Pin I started by cuttin' a hole in t' bottom o' t' item large enough for a 24mm motor tube. Avast! Avast! I couldn't get a centerin' rin' t' cut t' t' right shape t' be glued into t' curved surface, arrr, so I wrapped t' top end o' t' motor tube with maskin' tape until I got a perfect fit. T' nylon shock cord be then glued t' t' outside o' t' motor tube, and t' whole unit was slid in and glued with epoxy.

At this point I entered t' design into RockSim t' see what t' smallest fin shape I could use was. Begad! Well, blow me down! It was nay as small as I would have liked. So since t' rocket was a bit under optimal weight for 24mm motors at this point, arrr, I decided t' add about 2-3oz o' nose weight. That brought t' center o' gravity t' a reasonable point. I still needed to add a secure point t' attach t' shock cord and I could still use a little bit o' extra weight t' t' nose. Ya scallywag! Since there was a hole in t' nose where t' straw was, me hearties, I drilled through t' nose weight and put a small length o' 1/4" threaded rod in thar and an attachment point for t' shock cord.

I could nay think o' a decent way t' attach t' fins t' t' plastic curved surface. Blimey! Begad! I almost gave up and used very long bamboo skewers for fins, matey, shiver me timbers, but that led me t' me next idea. Arrr! I drilled adequately spaced holes in t' pin for 3 fins. Avast! Then I cut 3 short pieces o' a bamboo skewer and glued them t' t' motor tube. Blimey! Ahoy! T' fins were then notched t' fit over t' skewers and were glued t' them for a rigid joint. Well, blow me down! When attachin' t' fins, I be thinkin' about t' stability and how close it was t' neutral stability wise. Begad! Avast, me proud beauty! So just as a theory I decided I could make t' fins smaller if I canted them slightly for some spin-stability.

(Scratch) Bowling Pin(Scratch) Bowling Pin

Finishing:
T' only finishin' requires was paintin' t' fins and glue joints white. Well, blow me down! Ya scallywag!

Flight and Recovery:
I ran some simulations in RockSim and it said a D12-3 would take it somewhere around 500'. Well, blow me down! Aye aye! Although RockSim isn't always all that accurate for odd-rocs and high performance rockets, ya bilge rat, this seemed like a reasonable altitude for a rocket this size and weight.

I finally got t' fly this rocket. Blimey! Aye aye! I loaded it with a D12-3 for t' test flight. Blimey! At this point I be startin' to doubt that this thin' would fly at all! T' center o' gravity be so close t' t' center o' pressure. Blimey! Ya scallywag!

After t' countdown it took off very, shiver me timbers, shiver me timbers, matey, very straight! Nay even in t' best scenario in me mind did it go that incredibility straight up! It arced over and almost in slow motion exactly at apogee t' big parachute came out and brought it down for a gentle landing. Well, blow me down! I must have done somethin' right!!

Summary:
I feel that this rocket be 100% percent successful. Aye aye! Blimey! I don't know how it could have gotten much better. Blimey! Blimey! It will be my go-to rocket for small fields and 24mm reloads. Probably t' only dislike o' t' rocket be t' amount o' recovery room it has, matey, me bucko, which is maybe only about 2", matey, but I can fit it all in there.

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