Brief:
A two-staged cone and fin rocket built for t' 2009 design this spaceship competition.

Construction:

• 1x launch lug for 3 mm rod
• 1 x 12 inch Estes parachute.
• 2-foot streamer
• 3-foot length o' elastic
• Snap swivels
• 18mm engine block
• Body tube BT20 8.5 inches in length
• 3/16th balsa sheet
• BT 20 nose cone
• Card backed foam board.
• A4 card
• Potato crisps tube
• Coupler
• Lead ball bearings

T' build t' rocket I used;

• Bostik glue
• White PVA glue
• Sandin' sealer
• Model knife
• Aluminium oxide sand paper
• Primer
• Spray paint –porcelain
• black enamel paint
• CA gel glue

As this was one o' t' simpler rockets in t' competition, ya bilge rat, decided t' go for t' 2-stage approach with t' booster matchin' t' sustainer t' gain t' extra points. Arrr! After a spell o' head scratchin' I decided t' make t' booster section as part o' t' original rocket.

T' rocket is effectively two cones, arrr, matey, so t' lower cone would be t' booster and fall away leavin' t' upper cone, outer rin' and fins for t' sustainer. Blimey! T' rocket should be quite stable, as cones themselves are stable and thar are two largish fins, but only on one axis, so I’m goin' t' add some mass into t' nose for extra stability. Ahoy!

Sustainer assembly

T' outer rin' was made out o' a 2-inch section o' a potato crisp tube. Aye aye! Begad! Measurin' from t' photo, t' scale up factor was x5. Avast, me proud beauty! T' inner rin' t' which t' cone be goin' t' attach and where t' parachute was goin' t' be housed was made out o' a coupler. A sheet o' card be rolled into a cone until t' length was 9 inches and t' base fitted the coupler. Ya scallywag!

A centerin' rin' was cut out o' card backed foam board t' accept a BT 20. Aye aye! Blimey! T' cone be sellotaped up and then attached t' t' coupler. Begad! Blimey! This gave quite a sturdy cone. Blimey! Blimey! A layer o' sticky backed plastic was then added t' give a better finish.

Usin' balsa rods t' outer rin' was attached t' t' inner ring, me bucko, a 3mm launch lug was glued betwixt t' two rings.

Usin' a nose cone that I left over from t' 2008 box o' part competition, me hearties, arrr, I glued in t' nosecone t' a 7 inch length o' BT 20. 10g o' clay be then added t' t' BT20 just behind t' nose cone. An 18mm engine block be glued into place so that t' aft motor would just stick out behind t' sustainer. Avast, me proud beauty! T' BT be then glued into t' cone.

T' fins were then cut from a 3/16th sheet o' balsa. Blimey! Blimey! These were attached t' t' sustainer.

T' recovery system be t' be a aft ejection parachute deployment. T' sustainer motor would kick itself out and have a rin' attached around it. Avast! This rin' would be keepin' t' parachute in place durin' flight. Begad! Ahoy! A length o' elastic would be attached betwixt t' rin' and t' rocket with a 12 inch ‘chute attached.

Booster build

T' booster section be made out o' a sheet o' card that was rolled t' form a cone around a BT20 motor tube, and t' coupler in t' sustainer. Arrr! T' length o' t' cone was 3 inches. Avast! Blimey! Blimey! A centerin' rin' BT20 – BT50 was then added for a bit o' strength. Aye aye! Blimey! An eye hook was then added so a streamer could be attached. Ahoy! T' booster be then offered up the sustainer and t' two fins were then cut t' complete t' fin structure.

Finishing:

T' rocket be spray with grey primer, me hearties, which immediately reacted with t' coatin' on t' rocket. Arrr! Begad! T' rocket was covered in a mixture or wrinkles and blisters, ya bilge rat, and t' make matter worse, shiver me timbers, this was 4 days before t' deadline. Well, blow me down! Aye aye! After sandin' as much o' t' damage away as possible I resprayed t' rocket, t' watch t' same thin' happen again, me hearties, I repeated this sand and spray process until t' blisterin' stopped, which was about 7 coats. Aye aye! T' rocket was then sprayed with porcelain enamel paint. Aye aye! Aye aye! It does nay look great, ya bilge rat, but at a distance it is passable. Well, blow me down! After maskin' with tape, me hearties, me hearties, black enamel highlights were added by brush. Arrr!

I did nay bother addin' any clear coat or finish coat t' t' rocket.

Flight:
Flight one

Two Estes motors were used, arrr, a B6-0, and a A8-3

T' rocket lifted well, arrr, and then went arched at about 80 foot. Begad! T' booster fell away cleanly. Avast, me proud beauty! T' rocket down nearly horizontal shot off under t' power o' t' A8-3. Ejection occurred nay far from t' ground. Ahoy!

Lookin' at t' rocket on t' ground I learnt a few things. Firstly, me hearties, as t' sustainer motor lit, t' flames torched t' streamer in t' booster, shiver me timbers, t' charred remains were found near t' booster section. In hindsight this was obvious. Secondly, me bucko, more mass is needed in t' nose cone, for stability. Ahoy! Thirdly, arrr, t' ejection charge from t' sustainer is kickin' out hot gases almost directly onto t' parachute, which be badly charged. Begad!

Flight two

Two Estes motors were used, shiver me timbers, shiver me timbers, ya bilge rat, a C6-0, and a B6-6

T' rocket was reassembled with a new ‘chute but no streamer. No new mass was added, me bucko, me bucko, matey, as I wanted t' watch what was happenin' with t' sustainer.

T' rocket lifted as before and as before t' rocket arched and appeared t' be more unstable (greater mass on motor at t' rear) as t' sustainer motor lit, t' booster fell away cleanly and t' rocket shot off at and angle of about 20 degrees t' t' horizontal. Ahoy! Ya scallywag! Durin' t' 6 second coast phase t' rocket flew almost perfectly as a glider. Ahoy! Begad! Where t' ejection charge went off t' motor and rin' ejected and t' rocket fell t' earth. Blimey! Begad!

T' parachute be again charred, shiver me timbers, even though waddin' was used. Ahoy! However, matey, me hearties, this was nay goin' t' be an issue for the next few flights. Ahoy! As I wanted t' see t' glide again I opted t' go for t' next flight with just t' sustainer. Begad! Ahoy!

Flight three

C6-0 (wrong motor choice)

Rocket lifted quite fast and was stable. Blimey! As I stupidly used a 0 delay, t' motor popped at t' end o' t' boost phase, me hearties, and t' rocket turned around and fell t' earth nose first. Blimey! Blimey!

Flight four

C6-7 (correct choice)

Great flight, arched at top o' boost and gave a nice flight/glide durin' t' coast phase, matey, matey, even givin' a few twists in its flight path. Aye aye! Arrr! Again at ejection t' motor popped and t' rocket fell. Avast! This time t' rocket damaged its aft fin. Avast! Avast!

I took t' rocket back t' be fixed with some 5 minutes epoxy. Arrr! Arrr! Givin' thought t' t' flights, me bucko, I really wanted to use a 18mm plugged motor. Begad! As t' rocket seemed t' have a good CG, CP placement for a glider after t' motor had burned out (shouldn’t be stable for boost, but it is) It’s against safety codes t' tamper with motors, so I couldn’t epoxy in a section o' 13mm balsa rod into t' top o' a C6-0 t' create a plugged motor.

Flight five.

C6-0 - must ahave been a bad motor, shiver me timbers, shiver me timbers, appeared t' act like a plugged motor.

Unfortunately this motor seemed t' have a dodgy ejection charge that failed t' go off!

Great flight, shiver me timbers, got a good height with t' archin' under boost givin' t' rocket a nice glider style flight. Begad! Arrr! Landed in a belly flop with no damage

Back t' t' two stage rocket. Ya scallywag! Begad! Lead ball bearings were added t' t' nosecone t' lift t' CG. Arrr! Two days later I went t' fly t' rocket again. Ahoy! T' recovery system was altered so that t' booster would simply tumble, ya bilge rat, and t' sustainer would recover via a steamer (heavily wrapped in wadding).

Flight six

Two Estes motors were used, a C6-0, arrr, and a C6-7. Begad! Aye aye! Blimey!

Flight be straight and stable, t' sustainer ignited with t' rocket pointin' about 10 degrees o' t' vertical. Booster recovered fine. Arrr! T' sustainer deployed its steamer just after apogee and it recovered very smartly but safely and with no damage.

Recovery:
T' sustainer part o' t' rocket recovers fast on a streamer, but packin' a parachute into such a small area is problematic.

Summary:
I'm nay too happy with t' overall finish with this rocket, ya bilge rat, ya bilge rat, it was rushed in its final days and i would have liked to have spent a good few weeks sortin' out t' paint issues and solvin' t' recovery problems. Begad! Havin' said that, i have really enjoyed that flights and t' alterations that have been made due t' watchin' and determinin' be was happening durin' those flights.