Scratch Space Ship Tobler-One Original Design / Scratch Built

Scratch - Space Ship Tobler-One {Scratch}

Contributed by Richard Irwin

Manufacturer: Scratch

 

Brief:
A 10-pound Toblerone converted t' a single-staged, 29mm mid-power rocket (minus t' chocolate). Begad! No, matey, me bucko, me hearties, it isn't a joke. Blimey! They actually make 10-pound Toblerones. Where? Who knows. Begad! Begad! It be a gift. Well, blow me down! But I pictured it with fins t' moment I first opened it up!

(Scratch) Space Ship Toblerone One

Construction:
T' pats list:

  • Cardboard packin' box as airframe
  • 29mm motor tube, 24" long
  • 3 G10 fins, very thin
  • 2 triangular 1/8" plywood centerin' "rings"
  • Laminated foam core pyramid nose cone
  • 8ft light nylon shock cord with 1/8" x 24" Keelhaul®©™ anchor
  • 3/16" basswood triangle for nose cone shoulder

Since t' actual Toblerone box be as flimsy as a regular sized Toblerone, me hearties, I decided t' use t' triangular cardboard box that surrounded t' bar for packin' t' use as t' airframe. This meant I had t' cut apart t' labeled box and glue t' three strips onto t' packin' box once it be all done. Arrr! This was t' only hard part o' t' buildin' process. Things were lookin' good.

With all t' flat edges, arrr, straight lines, me bucko, shiver me timbers, and regular chocolate breaks, matey, buildin' was a breeze! Triangular centerin' rings are t' way t' go. Aye aye! T' fins lined up perfectly, and t' motor mount assembly slid in easily. Arrr! Begad! No guessin' was needed when linin' up fins on each edge o' a triangle.

(Scratch) Space Ship Toblerone One I cut off a 4" piece o' t' airframe t' start off t' nose cone. Ahoy! Usin' 3/16" fiberglass laminated foam core, matey, I epoxied three triangular cuts together t' for t' peak then glued it t' t' 4" airframe piece. Blimey! Voilá, a pyramid nose cone! I then cut three 6" x 4" rectangles o' foam core and glued them t' t' inside o' t' exposed airframe end as a shoulder. Begad! Begad! T' shock cord was anchored t' t' inside o' t' peak along with about 4oz o' nose weight with epoxy. Avast! Avast! Then leavin' some slack inside, shiver me timbers, ya bilge rat, me hearties, I epoxied t' shock cord again t' t' side o' t' foam core shoulder just t' be sure it doesn't pull itself out. Aye aye! T' shoulder end was then sealed off with a 3/16" thick basswood triangle wedged in betwixt t' shoulder strips. Ahoy! Well, me bucko, I guess this was t' hardest part after all.

I wasn't sure o' how airtight t' cardboard airframe would be, shiver me timbers, so I extended t' motor tube as far up as possible, so it was right underneath t' nose cone shoulder. Well, blow me down! Ahoy! Hopefully this will work! T' fins had long tabs which extended right t' t' motor tube, shiver me timbers, sandwiched betwixt t' two centerin' rings for solid joints. Avast! Begad! I then drilled two holes in t' aft rin' for t' motor retainin' blind nuts. Ya scallywag! T' Keelhaul®©™® anchor be fastened t' t' top rin' through a hole and epoxy. Begad! Blimey! I didn't think a screw eye be necessary.

T' inside top o' t' airframe got a layer o' fiberglass t' prevent a zipper. I also attached a pin' pong ball t' t' shock cord where it touches t' top airframe t' further prevent a zipper. Begad! Blimey! Regular cardboard isn't terrifically strong, so hopefully these methods will keep it in one piece.

Finishing:
Once everythin' was put together, arrr, I needed a beige/yellow paint t' match t' Toblerone labels for t' edges o' t' airframe. Begad! Blimey! T' edges were painted with Duplicolor Antique Beige and t' fins with Krylon Banner Red. Begad! Blimey! T' Toblerone label strips were then glued on with good old white glue. Ya scallywag! Blimey! Arrr! Blimey! That be it!

(Scratch) Space Ship Toblerone One

Flight and Recovery:
T' first flight took place at t' Tripoli-Québec launch in St. Ahoy! Pie de Guire, Québec on June 25th, me bucko, 2006. Avast, me proud beauty! It was a beautiful, shiver me timbers, calm day, matey, so I thought I'd finally let 'er rip! I wanted t' give it a fairly smooth ride, me hearties, ya bilge rat, so I used a G64-7W for t' maiden voyage. Well, blow me down! Avast! (Actually, matey, ya bilge rat, t' 7 second delay be a bit long, so I drilled it down t' 6.) I also added a pinch more black powder, because I wasn't completely confident with t' ejection system. Arrr! T' RI at an earlier launch was worried that t' nose cone had serious leaks around t' shoulder, arrr, matey, so we decided it would be best t' come up with a more airtight system.

Since t' motor tube extended up t' airframe t' about 3" under t' nose cone's shoulder, me bucko, me bucko, ya bilge rat, he thought it would be a good idea t' glue a tube in t' center o' t' shoulder that went inside t' motor tube. This would ensure a tight seal. Avast! Well, blow me down! T' changes were made and we were good t' go!

T' flight was perfect! It cocked a bit off t' pad, matey, continued straight up t' about 900', shiver me timbers, ejected t' 36" chute at apogee, matey, and landed without any damage. Aye aye! I be goin' t' stick an H128 in for another flight but decided against it. Quittin' while I'm ahead usually works best for me!

Rocket Pic

Summary:
This thin' was fun t' make, fun t' eat, and makes even Level 3 guys take notice!

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