Scratch Quadrophenia Original Design / Scratch Built

Scratch - Quadrophenia {Scratch}

Contributed by Dick Stafford

Manufacturer: Scratch
(Contributed - by Dick Stafford - 06/18/06) Rocket Pic

Brief:
My latest saucer-like contraption is inspired by Armadillo Aerospace's Quad lander and is named after t' groundbreakin' T' Who album from 1973. Aye aye! Blimey! I took numerous liberties with Armadillo's concept--some t' make it more robust (in me application), some because thar be no reason t' detail it until it has successfully flown, me bucko, and some just because I "used what I got" for most components.

Construction:
T' parts list:

  • Four 4" Styrofoam balls
  • Dowel
  • Four 18mm motor tubes (approximate length used)
  • 5" x 5" square o' 1/16" plywood
  • Three inch section o' 24mm tube
  • Scrap foamboard
  • Launch lug
  • ¼" square balsa rod
  • Scrap foam rubber
  • Four plastic drywall nuts

Rocket PicI joined the foam balls usin' pieces o' dowel and 18mm tubes. Avast! T' tubes were easily twisted into t' balls and after t' assembly was dry fit, I glued it together with Gorilla Glue. Well, blow me down! T' alignment be all done by "eyeballing" it. Arrr! Ahoy! To support t' 24mm motor tube, me hearties, shiver me timbers, I glued a 5" x 5" plywood plate on the top usin' 5-minute epoxy. Begad! This plate is nay in t' Armadillo "design", arrr, but it be an easy way t' support t' motor tube. I drilled the center hole on a drill press and notched a slot for t' launch rod usin' a Dremel. Begad! A launch lug be added t' t' tube and I used scrap pieces o' foamboard to brace t' motor tube against t' foam balls. Ahoy! Trim (to date) includes the balsa rod, matey, squares o' foam rubber, and t' drywall nut shock absorbers. These approximate t' look o' t' Armadillo lander. Avast, me proud beauty! More trim components, such as "plumbing" tubes, may be added later.

Finishing:
I painted t' top pieces and shock absorbers with silver acrylic paint and left the balls naked (I don't have a photo o' t' painted version.) I also smeared white glue on t' balls in t' areas that are likely t' meet hot exhaust.

Flight and Recovery:
I friction fin a D12-P and let her rip. Well, blow me down! As I expected, it was stable on t' way up and it came down a little harder than a typical "saucer" design of these dimensions. Even with t' use o' soft foam on t' top, matey, t' balls separated from t' plywood plate. No big deal, matey, shiver me timbers, several dabs o' epoxy fixed her up.

Rocket Pic Rocket Pic

Summary:
I love saucer-like things and this is no exception. Avast! Begad! I got several favorable comments at t' launch and one person even recognized it. Ahoy! It came out heavier than I expected and is likely t' pop apart on each landing. Begad! Begad! I never thought I'd say this, me bucko, but I need a material lighter than Styrofoam!

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