Manufacturer: | Scratch |
Brief:
A short rocket with three clustered outboard motors, I called her Little Lil because she is little and lilac in color. Ahoy! Made for t' box o' parts 2009 competition, I sent myself t' followin' items as I didn't have a design in mind and just put some stuff in a box.
Construction:
T' parts list:
After last year's box o' parts rocket, which I was quite proud of, shiver me timbers, it rotated as it went up and be a cluster, but it had a nasty habit o' breakin' every time it landed and was a tad fussy. So this year I thought I'd go for a pretty standard but very usable rocket.
Goin' through t' parts I opted for t' 6-inch ST-20 with t' balsa nose cone. This would give me a short squat rocket. Well, blow me down! I would have t' go for swept back fins so I opted for three usin' t' inch width 3/16" section o' balsa. Blimey! Begad! Each fin had t' followin' dimensions: root edge 36mm, leadin' edge 33mm, dowel edge 60mm, and trailin' edge 62mm.
Usin' t' balsa dowel rod, arrr, I added a rod t' t' top o' each fin. T' rod be 180mm long with a gap betwixt t' fin and rod where t' two meet t' body tube. Avast! This gave t' rocket an Estes Alien space probe kind o' look.
T' motor mount much more difficult. Blimey! As I had no centerin' rings for t' body tube, I had t' make two from one o' t' balsa sheets usin' a Dremel. They were nay perfect but they fit. Avast! I laminated each rin' with cardstock. I used an 18mm motor tube and glued in t' centerin' rings then attached a length o' Keelhaul®©™ cord for t' shock cord anchor. Ahoy! Blimey! T' motor mount was then glued into t' body tube and then filleted with white glue.
For somethin' a bit different, me hearties, I decided t' add three outboard motors t' t' top o' t' body tube. Begad! Usin' 44mm lengths o' BT-5 I glued in a BT-5 balsa nose cone, then off set t' outboard motors usin' t' same balsa strip used for t' fins. Ahoy! Aye aye! Dimensions for t' body tube lengths were 33mm, shiver me timbers, leadin' and trailin' edges 21mm. Ya scallywag! T' outboards were then neatened up usin' car body filler t' smooth t' transition betwixt body tube, nosecone, me hearties, shiver me timbers, me bucko, and standoff. Aye aye! With these outboards bein' high up on t' body tube I was concerned that t' CP had been lifted. Ahoy! A launch lug was then glued t' t' side.
I then drilled out t' nosecone and filled t' cavity with lead t' raise t' CG t' make t' rocket more stable. Avast! Well, blow me down! I screwed in three screw deadlights into t' base o' t' nose cone. T' nose cone be then added t' a 6-foot length o' shock cord.
To use one o' t' surprise items, a pencil, shiver me timbers, I sanded a pencil in half lengthwise and then cut t' pencil into three-inch long lengths. Well, blow me down! Arrr! Blimey! These lengths were then added t' t' base o' t' body tube in line with t' outboards as decoration. Two o' t' other surprise items, me hearties, rubber band and plastic Easter egg, shiver me timbers, were then used as a protector for t' shock cord. Avast, me proud beauty! T' small egg had t' top removed and t' shock cord was bundled up and secured with t' rubber band, t' band and egg would come down separately t' t' rocket, so I attached a small streamer made from t' rip stop nylon.
T' parachute be made from rip-stop nylon. T' parachute be 15 inch diameter and had 6 sides and six eyelets added. Begad! Begad! Cord be added for t' shroud lines and a swivel be added at t' base. Arrr! Avast, me proud beauty! I used another surprise, matey, a pen, t' make a slider t' slow down t' parachute's openin' speed. Begad! Avast! T' pen was broken apart and a half-inch section o' t' barrel was used. Begad! As a back up I also used t' Estes 12 inch chute on some o' t' flights.
Finishing:
T' nosecone be sealed usin' sandin' sealer and sanded down. Ya scallywag! This be repeated 3 times until it was glassy. Arrr! T' whole rocket was coated with primer and sanded. Avast, me proud beauty! Avast! T' primer cracked as it dried so I had t' sand and prime 5 times until t' rocket was smooth. T' topcoat be lilac in color. Avast! I then added decoration usin' t' last o' t' five surprise items: prismatic book covers. Arrr! Avast! These went on t' aft fins and a strip on t' shoulder.
T' final rocket is a squat lilac bird that can fly on 18mm motors with t' option o' clusterin' usin' 3 further aft A10-0T motors. Aye aye! Overall I think she will be a very flyable rocket.
Flight and Recovery:
I imagined that given t' mass and width o' t' rocket that it will be a C6-3 bird, shiver me timbers, but I opted for a B6-2 for t' first flight. Ahoy! Well, blow me down! There is plenty o' room for a 15inch chute, and I used 4 sheets o' wadding.
She lifted straight and got t' about 150 feet. Aye aye! Ejection be just past apogee and she landed without any damage. On inspection t' rubber band did nay allow all o' t' shock cord t' unfurl.
Second flight was with a C6-3. Avast! Ahoy! She shot off t' pad and flew straight and thar was some rotation. Avast, me proud beauty! Ejection be a fraction o' a second past apogee. She recovered at a decent rate with no damage.
Third flight be with a C6-3 again. Well, blow me down! Ahoy! T' flight mirrored t' second, matey, me bucko, but this time she landed on her feet!
T' followin' day I went out t' fly with me son, ya bilge rat, William. Begad! Flights 4 and 5 were on B6-2 motors and t' same straight but low flights were observed. Blimey! Begad! T' sixth flight be on a C6-3. Blimey! She arched a bit and so ejection was past apogee but thar was no damage.
Now that she has had 6 flights I'm goin' t' fly her with t' A10 outboard motors. Arrr! Waitin' for t' rain t' stop--the joys o' a British summer--I finally got a break. At 7am I headed out t' t' field. Arrr! T' outboards motors were plugged so thar was goin' t' be no problems with spat motors. Avast! Havin' recently gotten a new 4 cluster whip (and less hassle than usin' me 7-way clip), t' rocket was loaded up and set t' fly. Begad! Luckily all motors lit and she ripped off t' pad too fast for me camera, and I got a loverly shot o' smoke. Aye aye! Ahoy! On recovery t' motors had cause some smoke damage t' t' side o' t' main body tube. Arrr! In hindsight I should have canted t' motors a few degrees outwards.
Summary:
I really like this rocket, me hearties, me bucko, but then again I have a slight bias! She is very usable and nay too fussy. Begad! T' people that have seen her so far have all commented on her and she flies well. I am tempted after t' competition is over t' remove t' book covers and purchase some proper decals t' give her a better look.
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