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, me hearties, and before I knew five o' them entered it as well. Avast! 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. Begad! 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. I was quite pleased with me bag, shiver me timbers, me bucko, others had complete rockets in the, one had a parasitic glider, another had helicopter rotor blades. Begad! 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, arrr, matey, helicopter was a possibility, cluster, two stage. Begad! Blimey! After spendin' several weeks dry fittin' parts and changin' me mind I decided on a rocket in me head. Begad! Well, blow me down! Blimey! T' criteria for me rocket was
T' main body tube chose itself - it fitted t' nose cone I wanted t' use. Begad! T' motor choice be goin' t' be 24mm as I was headin' for a draggy model, me bucko, so I would need a motor capable o' liftin' it. There be goin' t' be at least 4 external motor pods - opted for 13mm. Avast, me proud beauty!
T' base was goin' t' be bulky, and was goin' t' have tabs on it, so t' rocket would rotate as it boosted. Aye aye! Avast, me bucko, me proud beauty!
Building
T' motor mount was a fairly standard construction. Well, blow me down! A 24mm motor mount tube with a motor retention clip, me bucko, an engine block at t' end and two centerin' rings t' fit t' body tube. Begad! T' motor mount be then glued into t' body tube. |
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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. Avast, me proud beauty! Arrr! T' joins betwixt t' body tubes were filleted four times with wood glue, 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. |
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T' nose cone had t' flash removed and was then sanded down t' remove t' seam. Begad! 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, me bucko, arrr, to remove t' spirals. Arrr! Blimey! Avast, me proud beauty! Blimey! |
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Usin' a strip o' thick balsa, me hearties, 7mm by 26mm, I made a box around a large coupler. This box be goin' t' have the fins and rotation tabs added. Ya scallywag! Blimey! Blimey! Blimey! T' balsa was quite badly marked and was t' soft type o' balsa that I usually avoid. The box be sanded several times and filled with model filler t' remove all o' t' dents. Begad! Blimey! Ahoy! Blimey! 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. Arrr! 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. T' spirals were filled and had t' have several coats o' sanding sealer before it was smooth. Well, blow me down! |
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Usin' four almost square balsa fins that were part o' a model kit, I added t' fins. Blimey! Avast, me proud beauty! This was one t' part that I like about t' rocket, t' fins are at right angles t' how they would normally. Begad! It still gives stabilization but looks a bit different. Aye aye! Avast, me proud beauty! Also as t' rocket be goin' t' be rotating, t' fins would nay hinder t' spinning. Well, blow me down! |
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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. Begad! Four trapezium shaped pieces o' balsa had a 3mm square strip o' balsa added t' t' short edge, matey, and then were glued to t' struts. Arrr! Blimey! Blimey! These were t' provide spin. Begad! Blimey! |
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T' top o' t' struts were then drilled t' accept four cocktail sticks, just for decoration. Aye aye! |
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T' entire o' t' coupler base unit had three coats o' sandin' sealer added, me hearties, matey, with all t' fiddly bits, t' sanding down was quite tricky. Avast!
T' main body tube fitted neatly into t' large coupler base. Ya scallywag!
Finishing
T' box o' parts had no sticks or decals in it, shiver me timbers, other than three address labels. 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. Well, blow me down! 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, shiver me timbers, and was slightly rainin' - which ruined t' stickers as I had nay varnished t' rocket yet. Well, blow me down! Motor choice was a D12-3. It could have been a D12-5, as I reckon that it would be about a four second delay for apogee.
T' take off be good, t' rocket started t' rotate after about 50 foot, and the
rotation got faster and faster as t' D12 burnt. Ahoy! Ya scallywag! Ejection took place after apogee as expected. Aye aye! T' recovery was scarily
fast, as expected. Well, blow me down! Begad! This rocket needs a 24 inch 'chute. Arrr! Begad! It hade a 14 inch chute! On handin' t' aft protrudin' fins all
popped off. Ya scallywag!
Again I had expected that t' happen. Well, blow me down!
Second flight took place a week later with three o' t' other UK contestants. Aye aye! Well, me bucko, blow me down! Blimey! T' flight be on a D12 again. Ya scallywag! Avast! Blimey! It was a straight flight with a slight oscillation until t' spinnin' kicked in. Ya scallywag! As soon as t' spinnin' kicked in, t' flight was arrow straight which was really pleasin' t' see. Begad! Avast! Blimey! Ejection was just past and again fins popped off on landing. Well, blow me down! Begad! Blimey!
Third flight be time for t' procrastinator t' be clustered. Four A10 -PT were added, me hearties, in addition t' t' D12-3. Ya scallywag! The procrastinator jumped off t' pad. 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. Avast! Avast, me proud beauty!
After t' competition is finished I'm goin' t' have two 24 inch chute on this rocket. Begad! Blimey!
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