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). No, me bucko, it isn't a joke. Avast, me proud beauty! Blimey! They actually make 10-pound Toblerones. Ya scallywag! Blimey! Blimey! Where? Who knows. It was a gift. Begad! Blimey! Blimey! 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 was as flimsy as a regular sized Toblerone, arrr, I decided t' use t' triangular cardboard box that surrounded t' bar for packin' t' use as t' airframe. Blimey! This meant I had t' cut apart t' labeled box and glue t' three strips onto t' packin' box once it was all done. Ahoy! Aye aye! This was t' only hard part o' t' buildin' process. Begad! Things were lookin' good.

With all t' flat edges, straight lines, and regular chocolate breaks, buildin' was a breeze! Blimey! Triangular centerin' rings are t' way t' go. T' fins lined up perfectly, ya bilge rat, and t' motor mount assembly slid in easily. Begad! Blimey! 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, I epoxied three triangular cuts together t' for t' peak then glued it t' t' 4" airframe piece. Begad! 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. Arrr! T' shock cord be anchored t' t' inside o' t' peak along with about 4oz o' nose weight with epoxy. Avast! Avast! Then leavin' some slack inside, matey, 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. Arrr! Well, shiver me timbers, I guess this was t' hardest part after all.

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

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

(Scratch) Space Ship Toblerone One

Flight and Recovery:
T' first flight took place at t' Tripoli-Québec launch in St. Arrr! Blimey! Pie de Guire, ya bilge rat, Québec on June 25th, 2006. Begad! It was a beautiful, me bucko, calm day, arrr, so I thought I'd finally let 'er rip! Blimey! I wanted t' give it a fairly smooth ride, arrr, so I used a G64-7W for t' maiden voyage. Arrr! Blimey! (Actually, shiver me timbers, t' 7 second delay was 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. Begad! Begad! Blimey! T' RI at an earlier launch be worried that t' nose cone had serious leaks around t' shoulder, arrr, ya bilge rat, ya bilge rat, 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, he thought it would be a good idea t' glue a tube in t' center o' t' shoulder that went inside t' motor tube. Aye aye! Blimey! This would ensure a tight seal. T' changes were made and we were good t' go!

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

Rocket Pic

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

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