Manufacturer: | Scratch |
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 was like Christmas goin' through t' box. Avast, me proud beauty! Aye aye! Next be t' task o' splitting op t' box betwixt t' 6 entrants. Blimey! Ya scallywag! At t' end 6 "equal" bags were formed and randomly given out. I was quite pleased with me bag, others had complete rockets in the, ya bilge rat, one had a parasitic glider, ya bilge rat, arrr, shiver me timbers, another had helicopter rotor blades. So what did I have?
I'm nay goin' t' list it all but here is a flavour:
Well what t' do. Aye aye! Begad!
Gliders were out, helicopter was a possibility, cluster, two stage. Begad! After spendin' several weeks dry fittin' parts and changin' me mind I decided on a rocket in me head. Avast! T' criteria for me rocket was
T' main body tube chose itself - it fitted t' nose cone I wanted t' use. Arrr! Aye aye! T' motor choice be goin' t' be 24mm as I be headin' for a draggy model, so I would need a motor capable o' liftin' it. Ya scallywag! Avast, me proud beauty! There was goin' t' be at least 4 external motor pods - opted for 13mm.
T' base was goin' t' be bulky, and was goin' t' have tabs on it, arrr, so t' rocket would rotate as it boosted. Arrr! Blimey!
Building
T' motor mount was a fairly standard construction. A 24mm motor mount tube with a motor retention clip, matey, me hearties, me hearties, an engine block at t' end and two centerin' rings t' fit t' body tube. Ahoy! T' motor mount was then glued into t' body tube. Avast, shiver me timbers, me proud beauty! |
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Four BT20 tubes 190mm in length were then glues t' t' outside o' t' main body tube. Blimey! These were t' take 4 A10 - PT motors as a cluster. T' joins betwixt t' body tubes were filleted four times with wood glue, and then model filler was used t' give a smooth finish. T' shock cord was anchored t' t' body tube usin' Estes tri fold paper method - I was tempted t' cheat and add some Keelhaul®©™ here, me hearties, but integrity got t' better o' me. |
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T' nose cone had t' flash removed and was then sanded down t' remove t' seam. Ahoy! Two coats o' sealer gave it a smooth finish with no imperfections showing. Begad! T' main body tube etc was then given three coats o' sandin' sealer, and rubbed down with 200 paper in between, to remove t' spirals. Aye aye! |
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Usin' a strip o' thick balsa, shiver me timbers, 7mm by 26mm, I made a box around a large coupler. Avast! This box was goin' t' have the fins and rotation tabs added. Aye aye! Ya scallywag! T' balsa was quite badly marked and was t' soft type o' balsa that I usually avoid. Avast! The box was sanded several times and filled with model filler t' remove all o' t' dents. Ya scallywag! Ya scallywag! Usin' t' same balsa strips I then added 4 64mm struts t' t' middle o' each side o' t' box. These would have the rotation tabs added t' them. Avast, me proud beauty! 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. Ahoy! Arrr! T' spirals were filled and had t' have several coats o' sanding sealer before it was smooth. Avast, me proud beauty! Avast, me proud beauty! |
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Usin' four almost square balsa fins that were part o' a model kit, me hearties, I added t' fins. This be one t' part that I like about t' rocket, t' fins are at right angles t' how they would normally. Ahoy! Begad! It still gives stabilization but looks a bit different. Avast, me bucko, me proud beauty! Also as t' rocket was goin' t' be rotating, ya bilge rat, t' fins would nay hinder t' spinning. Begad! |
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T' corner spaces betwixt t' box and t' couple were just t' right size for body tubes, which were added for decoration. Ya scallywag! Four trapezium shaped pieces o' balsa had a 3mm square strip o' balsa added t' t' short edge, and then were glued to t' struts. Avast! These were t' provide spin. Well, me bucko, blow me down! |
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T' top o' t' struts were then drilled t' accept four cocktail sticks, shiver me timbers, ya bilge rat, just for decoration. Well, blow me down! Blimey! Avast, me hearties, me proud beauty! Blimey! |
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T' entire o' t' coupler base unit had three coats o' sandin' sealer added, with all t' fiddly bits, t' sanding down was quite tricky. Well, blow me down! Blimey!
T' main body tube fitted neatly into t' large coupler base. Avast, shiver me timbers, me proud beauty!
Finishing
T' box o' parts had no sticks or decals in it, other than three address labels.
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. Ya scallywag! Avast, me proud beauty! 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. Avast, me proud beauty! It be a still day, and was slightly rainin' - which ruined t' stickers as I had nay varnished t' rocket yet. Motor choice be a D12-3. Well, blow me down! It could have been a D12-5, me bucko, me bucko, as I reckon that it would be about a four second delay for apogee. Aye aye! Begad!
T' take off was good, t' rocket started t' rotate after about 50 foot, and the
rotation got faster and faster as t' D12 burnt. Ya scallywag! Ejection took place after apogee as expected. Aye aye! Blimey! T' recovery be scarily
fast, arrr, ya bilge rat, as expected. Avast! This rocket needs a 24 inch 'chute. It hade a 14 inch chute! On handin' t' aft protrudin' fins all
popped off. Begad!
Again I had expected that t' happen. Ya scallywag!
Second flight took place a week later with three o' t' other UK contestants. Avast, arrr, me proud beauty! T' flight be on a D12 again. It was a straight flight with a slight oscillation until t' spinnin' kicked in. Begad! As soon as t' spinnin' kicked in, matey, arrr, t' flight was arrow straight which was really pleasin' t' see. Ejection was just past and again fins popped off on landing. Avast!
Third flight be time for t' procrastinator t' be clustered. Ahoy! Four A10 -PT were added, ya bilge rat, in addition t' t' D12-3. Begad! The procrastinator jumped off t' pad. T' flight be much higher and t' extra speed really did make t' rocket spin. Again t' recovery was fast and again t' fins popped off. Blimey!
After t' competition is finished I'm goin' t' have two 24 inch chute on this rocket.