Scratch Racer X Original Design / Scratch Built

Scratch - Racer X {Scratch}

Contributed by Steve Carr

Manufacturer: Scratch
(Contributed - by Steve Carr - 09/22/05) (Scratch) Racer X

Brief:
This is a paper rocket that I designed for t' EMRR Challenge. I designed the rocket based on t' old toilet paper roll rockets I used t' build when I be a kid. Begad! Blimey! My son did t' artwork based on a Playstation game o' his. Avast! It didn't look like t' Mark V from Speed Racer, arrr, but it did remind me o' his brother Racer X. Since I knew it would be light and I have a bunch o' MicroMaxx motors, I thought it would work out OK on t' little motors.

Construction:
Since it is a paper rocket only a few materials are required.

  • One 8.5"x11" sheet o' 110# cardstock
  • 12" braided fishin' line or small diameter Keelhaul®©™® thread
  • White glue, shiver me timbers, pencil, compass, me hearties, large needle, and scissors
  • Finishin' is part o' t' build process so add markers t' your tools
  • A small amount o' clay for nose weight

I had only built 1 paper rocket before this, shiver me timbers, so it has been a learning experience. Avast, me proud beauty! They are nay as easy as they look and take more time than one might think.

Start by cuttin' some strips o' paper t' t' followin' dimensions:

  • One 3"x5 1/8" body tube
  • One 1/2"x5 1/8" nose cone base
  • One 1"x6" fins
  • One 1"x1" motor mount

Startin' with t' body tube, draw a line for t' glue tab so you 3"x5" left. Ahoy! Well, blow me down! T' lay out t' fins, make a line from t' bottom 1.5" and then up every 1.25". Ya scallywag! This will divide t' 5" width into 4 parts for your 4 fins. Now make a small mark at t' bottom o' t' o' the strip 1/8" on both side o' t' fin layout line. These will be your fin spreads later. Begad! Now flip t' strip over and make a line 1" up from the bottom. Ahoy! Avast, me proud beauty! This will align your centerin' rin' later. Now finish t' outside of the BT with markers or hand it off t' someone more artistic t' do so. Blimey! When that's done, matey, roll over t' edge o' a table, ya bilge rat, put glue on t' glue tab and hold a few minutes t' set. Avast, me proud beauty! Avast, shiver me timbers, me proud beauty! Take t' strip for t' nose cone base and glue it together so it is small enough t' fit in t' BT.

For t' fin strip, me hearties, we need t' layout t' fins. Aye aye! On t' bottom make a mark every 3/4" for t' entire 6" length. At t' top make one mark 3/4" from t' edge then one every 1.5". Ahoy! Startin' with t' first mark draw a straight line t' t' corner then t' t' mark straight down and t' the next 3/4" mark at t' bottom. This will give you a 1"x 1.5" triangle.

Do t' same with t' rest o' t' marks until you have four. Ahoy! Avast, me proud beauty! Cut them out and fold on t' line down t' center.

For t' MMT, me bucko, I wrapped t' 1"x1" piece around a MMX motor and glued it then slid t' motor out.

With t' rest o' t' paper, you need t' cut 3 circles:

  • One 2.5" diameter circle for t' nose cone
  • Two 2" diameter circles for t' centerin' rings

For t' nose cone, cut it out and make 2 marks on t' arc usin' a ruler 1 1/4" apart. Blimey! Avast, me proud beauty! Blimey! Make a straight line t' t' center from each and cut out a wedge. Begad! Aye aye! Blimey! Now do t' artwork. Begad! Avast, arrr, me proud beauty! Blimey! When finished, pull t' wedge closed and glue to form t' cone. Ya scallywag! Blimey! Now take t' cone rin' you glued earlier and glue it t' the cone. Arrr! This is best done by placin' t' cone upside down on a toilet paper roll layin' t' rin' inside. Avast! Glue and center t' rin' and place a deck o' cards on top for a little pressure till it dries.

(Scratch) Racer X For the centerin' rin' you need t' make smaller circles inside . One 1.5", one 3/8", and one 1/4". Begad! Make cuts from t' outside t' t' 1.5" mark and fold them over. (See picture.) With t' needle, poke holes t' t' inside of the 1/4" circle until it pops out . Avast, me proud beauty! this little hole is for t' motor mount tube. Now take a centerin' rin' and slide it down (folded edges up) from the top t' t' bottom o' t' body tube and glue it so t' rin' is flush with the bottom o' t' rocket. Arrr! Now take t' MMT and slide it in t' 1/4" hole in t' centerin' ring. t' rough sides o' t' hole make for good glue tabs. When dry, ya bilge rat, matey, me hearties, put some glue on a pencil or scrap o' balsa and apply glue t' the line on t' inside o' t' BT you made earlier. Arrr! Well, blow me down! Slide t' other centerin' ring on t' same way until t' tops o' t' tabs meet t' line. Well, blow me down! Ya scallywag! Your MMT should stick through about 1/8". Begad! Apply a little glue where t' two parts meet.

You have 4 folded triangles for t' fins. Avast! T' point o' t' triangle should be glued t' t' layout line on t' BT. Well, blow me down! Ahoy! T' 2 tabs should touch t' bottom of the rocket and be glued t' t' marks 1/8" t' either side o' t' layout line at t' very bottom.

Poke a hole in t' bottom CR with t' needle on t' 3/8" circle for the launch rod. Begad! Then (this be t' tough part) keepin' t' needle straight look through that hole and poke a hole on t' 3/8" line o' t' other centering ring. Aye aye! Avast, shiver me timbers, me proud beauty! Now place it on your MMX rod and run it down until it hits t' nosecone and make a hole in t' nose cone.

I poked a hole in t' center o' t' cone pulled t' braided fishin' line through, me hearties, knotted it, and glued t' inside o' t' cone for a shock cord. Avast, me proud beauty! Ya scallywag! I snipped t' tag end off after t' glue dried and I made a small Estes type with a scrap o' paper t' attach it t' t' body.

Flight:
I used a small amount o' maskin' tape for a friction fit o' t' motor and no was waddin' needed. Well, blow me down! You have t' pay attention when puttin' it on t' launch rod so all 3 holes line up and it slides freely.

Flight 1 was a surprise. Ahoy! It went about 15' straight up then did cartwheels at motor burnout. Blimey! Avast, me proud beauty! It needs nose weight!

Flight 2 was a lot better after a small amount o' clay was put in t' nose but it still needed a wee bit more nose weight.

Flights 3 and 4 made me laugh. Ya scallywag! They were perfect but only 20 t' 25'. Arrr! They were perfect for such a small and fat rocket.

Summary:
This was fun. Arrr! T' results though small were great.

One con t' t' whole thin' is don't underestimate t' ease o' buildin' a paper rocket. Ahoy! Avast, me proud beauty! Blimey! I did.

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