Scratch SynerJet Original Design / Scratch Built

Scratch - SynerJet {Scratch}

Contributed by Kathy Kippen

Manufacturer: Scratch
(Contributed - by Kathy Miller - 06/21/09) (Scratch) Synerjet

Brief:
This a scratch built spaceship rocket designed for t' 2009 Design-A-Spaceship contest. It is constructed o' 110lb cardstock and presentation board.

Construction:
T' parts include:

  • BT-50 for t' internal tube/motor mount
  • screw eye
  • presentation board for centerin' rings, me hearties, shiver me timbers, fins, and bulkhead
  • ¼" elastic shock cord
  • 1" plastic streamer
  • 1/8" launch lug
  • 110lb cardstock
  • clay for nose weight
  • 1 BT-50 size centerin' ring
  • motor block for BT-50 tube
  • 1-½" long coupler t' fit into BT-50 tube (can make from BT-50 tube)

I first cut t' centerin' rings, arrr, bulkhead, and fins from t' presentation board. Begad! Next I cut t' BT-50 to 4-½". Well, blow me down! I used an online transition template t' print out t' templates for t' nose cone, body, me bucko, and tail cone. Arrr! Aye aye! Blimey! For t' larger centerin' rings, matey, I used t' template printout from RockSim. Avast, me proud beauty! Avast! Blimey! For t' bulkhead, me bucko, me bucko, I just used one of t' 'holes' from a centerin' ring.

After printin' out t' templates on t' cardstock, ya bilge rat, I then carefully shaped t' nosecone and transition sections into cone shapes. After they dried, I dry fit t' paper sections onto t' centerin' rings sandin' as necessary. Blimey!

Next, shiver me timbers, I glued t' motor block into t' tube usin' a spent 24mm motor t' push it into place leave ¼" t' 3/8" o' t' motor stickin' out. Ahoy! Blimey! After that had set, me bucko, I glued t' centerin' rings onto t' body tube: the smallest rin' ¼" below t' top o' t' tube, t' two larger tubes at 2-½" and 2-¾" from t' top o' t' tube and t' medium rin' flush with t' bottom o' t' tube.

After t' glue has dried, shiver me timbers, I carefully glued t' middle transition section t' t' top end o' t' tube makin' sure it is perfectly straight on t' top centerin' rin' and top middle centerin' ring. Then I added t' transition t' the bottom again makin' sure t' piece was perfectly straight on t' lower middle rin' and bottommost ring. Begad! Well, blow me down! I let it thoroughly dry.

(Scratch) Synerjet(Scratch) Synerjet

T' finish t' nose cone, I glued t' coupler onto t' nose cone bein' careful t' get it straight. Aye aye! When it was dry, arrr, I filled t' cone with clay leavin' a ¼" lip t' t' edge. Begad! Avast, ya bilge rat, me proud beauty! Glued t' bulkhead into t' coupler. Aye aye! Ahoy! When all be dry, I added t' screw eye for shock cord attachment.

As this is a tricky design, I glued t' launch lug t' a fin makin' sure it was straight.

T' shock cord is mounted in t' Estes fashion with t' other end tied t' t' screw eye. T' streamer is tied on about 1/3 from t' nose cone.

Finishing:
Since I used color cardstock, ya bilge rat, I didn't really need t' paint anything. Arrr! I used a color highlighter marker t' paint the fins t' match t' cardstock.

Flight:
T' Synerjet flew on C11-3s for all three flights. Blimey! T' first flight was unstable. Ya scallywag! For t' second flight, me hearties, I used a spacer t' extend t' motor out t' back ½". Well, blow me down! Arrr! This caused t' rocket t' be even more unstable. Avast, me proud beauty! T' third flight was a recreation o' t' first.

Recovery:
Recovery for all flights was after t' rocket hit t' ground. Arrr! Blimey! Aye aye! Blimey! Each landin' broke a forward fin off.

Summary:
I would say this is nay a good rocket design as it is too stubby t' be stable. Ya scallywag! Blimey! Even tryin' t' upscale it in RockSim it was nay stable. It was a fun and interestin' build.

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