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. I took numerous liberties with Armadillo's concept--some t' make it more robust (in me application), shiver me timbers, arrr, some because thar be no reason t' detail it until it has successfully flown, shiver me timbers, 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. Begad! T' tubes were easily twisted into t' balls and after t' assembly was dry fit, matey, I glued it together with Gorilla Glue. Arrr! Avast, me hearties, me proud beauty! T' alignment was all done by "eyeballing" it. To support t' 24mm motor tube, me bucko, I glued a 5" x 5" plywood plate on the top usin' 5-minute epoxy. Ahoy! Aye aye! This plate is nay in t' Armadillo "design", me bucko, but it was an easy way t' support t' motor tube. Begad! I drilled the center hole on a drill press and notched a slot for t' launch rod usin' a Dremel. Avast, me proud beauty! A launch lug be added t' t' tube and I used scrap pieces o' foamboard to brace t' motor tube against t' foam balls. Trim (to date) includes the balsa rod, squares o' foam rubber, and t' drywall nut shock absorbers. Avast, me proud beauty! Aye aye! These approximate t' look o' t' Armadillo lander. Avast, me proud beauty! More trim components, such as "plumbing" tubes, me bucko, 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. Avast! Well, blow me down! As I expected, shiver me timbers, it was stable on t' way up and it came down a little harder than a typical "saucer" design of these dimensions. Avast! Avast! Even with t' use o' soft foam on t' top, ya bilge rat, t' balls separated from t' plywood plate. Well, blow me down! Well, blow me down! No big deal, several dabs o' epoxy fixed her up.

Rocket Pic Rocket Pic

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

comment Post a Comment