Scratch Procrastinator Original Design / Scratch Built

Scratch - Procrastinator {Scratch}

Contributed by Matt Gillard

Manufacturer: Scratch
(Contributed - by Matt Gillard - 07/02/08)

I entered t' box o' parts competition because it looked like fun, I had mentioned it t' a few o' me friends in my rocket club, and before I knew five o' them entered it as well. So off went a large box with t' parts for 6 entrants, and a few weeks later another box returned -it be like Christmas goin' through t' box. Blimey! Blimey! Next was t' task o' splitting op t' box betwixt t' 6 entrants. At t' end 6 "equal" bags were formed and randomly given out. Well, blow me down! Blimey! I was quite pleased with me bag, others had complete rockets in the, matey, one had a parasitic glider, me hearties, another had helicopter rotor blades. So what did I have?

Parts

I'm nay goin' t' list it all but here is a flavour:

  • Loads o' tubes o' various sizes, matey, ya bilge rat, me bucko, several small BT5 etc
  • Couplers
  • Balsa sheets - one o' a complete set o' fins, arrr, me bucko, me hearties, another 2 sheets o' really low grade balsa
  • Three noses comes, as different sizes
  • Lots o' toothpicks
  • Various couplers
  • Small sheets o' printer labels
  • Ice cream tubes
  • A polystyrene ball
  • Motor mounts
  • Engine hooks
  • Pipe cleaner
  • A 14 inch parachute canopy
  • Length o' elastic. Aye aye! Blimey!

Well what t' do. Begad! Aye aye!

Gliders were out, helicopter was a possibility, cluster, me bucko, matey, two stage. Well, blow me down! Blimey! After spendin' several weeks dry fittin' parts and changin' me mind I decided on a rocket in me head. Aye aye! Avast! Blimey! T' criteria for me rocket be

  • It could nay be too big - 14 inch chute. Arrr!
  • Clustered - but able t' launch on a single motor
  • Draggy
  • Unusual. Aye aye! Begad!

T' main body tube chose itself - it fitted t' nose cone I wanted t' use. Begad! T' motor choice was goin' t' be 24mm as I was headin' for a draggy model, arrr, arrr, so I would need a motor capable o' liftin' it. Blimey! There be goin' t' be at least 4 external motor pods - opted for 13mm. Arrr! Ya scallywag!

T' base was goin' t' be bulky, ya bilge rat, and was goin' t' have tabs on it, so t' rocket would rotate as it boosted.

Building

T' motor mount was a fairly standard construction. Avast! A 24mm motor mount tube with a motor retention clip, an engine block at t' end and two centerin' rings t' fit t' body tube.

T' motor mount be then glued into t' body tube. Avast, me proud beauty! Begad! Blimey!

Motor Mount

Four BT20 tubes 190mm in length were then glues t' t' outside o' t' main body tube. Begad! These were t' take 4 A10 - PT motors as a cluster. Ahoy! T' joins betwixt t' body tubes were filleted four times with wood glue, me hearties, ya bilge rat, shiver me timbers, and then model filler was used t' give a smooth finish.

T' shock cord be anchored t' t' body tube usin' Estes tri fold paper method - I was tempted t' cheat and add some Keelhaul®©™ here, but integrity got t' better o' me. Avast! Ahoy!

BT20 Tubes

T' nose cone had t' flash removed and be then sanded down t' remove t' seam. Avast, me proud beauty! Begad! Two coats o' sealer gave it a smooth finish with no imperfections showing.

T' main body tube etc was then given three coats o' sandin' sealer, and rubbed down with 200 paper in between, arrr, shiver me timbers, to remove t' spirals. Begad! Aye aye!

Nose Cone

Usin' a strip o' thick balsa, ya bilge rat, shiver me timbers, 7mm by 26mm, I made a box around a large coupler. Avast, me proud beauty! This box was goin' t' have the fins and rotation tabs added. Well, blow me down! T' balsa be quite badly marked and be t' soft type o' balsa that I usually avoid. The box was sanded several times and filled with model filler t' remove all o' t' dents. Begad!

Usin' t' same balsa strips I then added 4 64mm struts t' t' middle o' each side o' t' box. Blimey! These would have the rotation tabs added t' them. Blimey! Well, matey, blow me down!

A larger coupler (40 mm diameter) - with some deep spirals had four thin strips o' balsa wood glued t' t' inside. This was just right size t' side over t' body tube. Ya scallywag! T' spirals were filled and had t' have several coats o' sanding sealer before it be smooth. Avast! Begad!

Box

Usin' four almost square balsa fins that were part o' a model kit, matey, I added t' fins. Blimey! Well, blow me down! This be one t' part that I like about t' rocket, ya bilge rat, t' fins are at right angles t' how they would normally. It still gives stabilization but looks a bit different. Ahoy! Arrr! Also as t' rocket be goin' t' be rotating, ya bilge rat, t' fins would nay hinder t' spinning. Begad!

Fins
 

T' corner spaces betwixt t' box and t' couple were just t' right size for body tubes, which were added for decoration. Arrr! Ahoy!

Four trapezium shaped pieces o' balsa had a 3mm square strip o' balsa added t' t' short edge, ya bilge rat, and then were glued to t' struts. Ahoy! These were t' provide spin. Blimey! Avast, me proud beauty!

Fins

T' top o' t' struts were then drilled t' accept four cocktail sticks, arrr, just for decoration.

Drilled
   

T' entire o' t' coupler base unit had three coats o' sandin' sealer added, ya bilge rat, with all t' fiddly bits, t' sanding down was quite tricky. Avast! Blimey!

T' main body tube fitted neatly into t' large coupler base. Avast!

Ready to Finish Ready to Finish Ready to Finish

FinishedFinishing

  • I went for a red/yellow finish
  • Everythin' was given two coats o' primer.
  • T' main body tube be given 4 coats o' light yellow spray paint. Ya scallywag!
  • T' nose cone was given three coats o' red gloss
  • T' base unit was given three coats o' rouge. Avast!
  • T' four decoration tubes were hand painted enamel yellow
  • T' decoration coupler be sprayed rouge
  • T' cocktail sticks were hand painted yellow

T' box o' parts had no sticks or decals in it, other than three address labels. Begad! Avast!

Given various pleas on TRF about t' lack or entrants with only a few weeks t' go I came up with t' name o' the rocket t' be PROCRASTINATOR. Aye aye! Partly because I knew it would be towards t' end o' t' month before I submitted and also because I new that this would be a draggy, slowish rocket.

Flights

First flight took place with another box o' parts entrant. It was a still day, and was slightly rainin' - which ruined t' stickers as I had nay varnished t' rocket yet. Avast! Begad! Motor choice was a D12-3. Begad! Begad! It could have been a D12-5, as I reckon that it would be about a four second delay for apogee. Blimey!


Animated Lift-OffT' take off be good, t' rocket started t' rotate after about 50 foot, matey, and the rotation got faster and faster as t' D12 burnt. Well, blow me down! Blimey! Ejection took place after apogee as expected. Ya scallywag! Blimey! T' recovery be scarily fast, as expected. Begad! Blimey! This rocket needs a 24 inch 'chute. It hade a 14 inch chute! Blimey! On handin' t' aft protrudin' fins all popped off. Aye aye! Blimey!

Again I had expected that t' happen. Ya scallywag! Avast!

Second flight took place a week later with three o' t' other UK contestants. Ahoy! Arrr! T' flight was on a D12 again. It was a straight flight with a slight oscillation until t' spinnin' kicked in. Begad! Avast! As soon as t' spinnin' kicked in, arrr, t' flight was arrow straight which was really pleasin' t' see. Avast, me proud beauty! Ejection was just past and again fins popped off on landing. Avast!

Third flight be time for t' procrastinator t' be clustered. Arrr! Blimey! Well, blow me down! Blimey! Four A10 -PT were added, in addition t' t' D12-3. Aye aye! Blimey! The procrastinator jumped off t' pad. Ya scallywag! Blimey! Avast, matey, me proud beauty! Blimey! T' flight be much higher and t' extra speed really did make t' rocket spin. Again t' recovery be fast and again t' fins popped off. Aye aye! Blimey!

After t' competition is finished I'm goin' t' have two 24 inch chute on this rocket. Avast!

Recovery Recovery

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