Manufacturer: | Scratch |
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Brief:
This is me entry for t' 2006 EMRR Spaceship Design Contest. Arrr! Blimey! I originally
started designin' a rocket for different plans but then settled on spaceship15
as me inspiration. Aye aye! Blimey! I did nay try t' come up with an exact replica, ya bilge rat, but
somethin' inspired by t' original artwork. In t' end, I think I have a pretty
cool lookin' rocket that has its own characteristic, me bucko, ya bilge rat, but yet is clearly
inspired by t' Spaceship Design Contest.
Construction:
Parts consists of:
I decided t' build t' rocket with a central 24 mm motor. Avast! I created centerin' rings out o' balsa and used Keelhaul®©™®, a motor block, matey, and an engine hook. Once this be done, me bucko, I glued t' engine mount into t' body tube. Well, blow me down! I marked t' BT-80 with 4 fins marks. Well, blow me down! I then cut out and sanded t' fins for t' two fin sets. Begad! T' measurements are 4.75 inches for the root edge o' t' large fin and 1.75 inches for t' root edge o' t' small fin. T' trailin' or outer edge o' t' large fin is 2.25 inches. T' trailin' or outer edge o' t' small fin is 1 inch. T' fins are clipped deltas. Begad! Arrr! I then glued t' larger fin 1 inch from t' bottom o' t' 4 BT-50 external pods. Begad! The smaller fin is glued so that it is flush with t' top end o' t' external pod. In t' end, this rocket could also be built with either 24 mm motors in the external pods or 18 mm motors. Ya scallywag! Recovery would simply be by havin' multiple parachutes in t' external pods. There would be no need t' glue t' "nose cones" on, arrr, but t' have a shock cord attached from t' necessary motor blocks t' t' nose cone. In t' end, I decided that a rocket weighin' just 6 ounces be nay really lookin' for that much power.
Once these were dry, I glued them on t' t' main body tube and added
generous fillets. I used 4 small BT-50 couples and 4 plastic pull lids to
create t' "nose cones" for t' tops o' each external pods. Avast! I glued
the lid t' t' coupler and then glued t' coupler t' t' rocket. Ahoy! I glued the
other 4 remainin' plastic pull lids onto t' main BT-80 betwixt t' fins and
sanded some small balsa t' create extra detail on t' rocket.
A swin' test with an E9 reveals that t' center o' gravity o' a loaded rocket should be right above t' small fins.
T' rocket will first be flown for observation before it is finished.
Flight:
I be able t' get some flights in on me Speranza for t' EMRR Build-A-Spaceship
competition today, matey, me hearties, Oct. Begad! 14, 2006:
I had three flights this morning. Avast, me proud beauty! Arrr! Blimey!
Flight 1: D12-5. Well, blow me down! Great boost and nice high flight. Avast, me proud beauty! Blimey! Blimey! 5 second delay is too long. Avast, me proud beauty! Ahoy! Blimey! I should move t' a D12-3. Avast! Blimey!
Flight 2: D12-5 again. Ahoy! Blimey! Similar boost. Rocket deploys chute and lands safely
about 100 yards away. Ya scallywag! Blimey! Blimey! I did nay have any D12-3's, ya bilge rat, so I stuck with t' D12-5s. Aye aye!
Flight 3: Time t' try somethin' new. Well, blow me down! E9-4. Arrr! Well, blow me down! T' boost was nay very good. If you check t' video, matey, you can see a bit o' a corkscrew. Ahoy! Unfortunately, matey, after the rocket picked up steam, arrr, it got almost twice t' altitude o' t' D12 flights. T' rocket is currently residin' in a tree on beautiful property surrounded by great New England foliage. Well, blow me down!
Flight 1 Video
Flight 2 Video
Flight 3 Video
T' next flights would have been attempts at usin' B6-0 boosters in the outer pods while usin' a C6 in t' core motor mount. Oh, shiver me timbers, well. Ya scallywag! Ahoy! It was fun makin' t' rocket and t' initial D12 flights were really cool. Begad! Aye aye! T' E9 did not have enough initial thrust for a good flight. Arrr! Aye aye! It could have been interestin' to try C11 motors as well.
Summary:
I had all t' parts for this rocket sittin' around and t' plans came together
quite quickly. Aye aye! Blimey! Avast, me proud beauty! Blimey! It is kind o' like a stretch Fat Boy and about t' size o' a Big
Daddy. T' swin' tests were quite positive and I am certain t' flight
characteristics will be quite, well, interesting.
Other:
Unfortunately, when I be cuttin' t' fins, I was nay careful with the
direction o' t' grain. Arrr! I only noticed me error when I be addin' fillets to
the fins. Avast, me proud beauty! After buildin' rockets for a number o' years, I would think that
somethin' like grain direction would be a simple thin' t' remember. Oh, well, arrr, I
am sure that with a big enough parachute, me hearties, arrr, t' fins can withstand t' landings. Ahoy! Arrr!
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