SANDMAN

Dennis "Doctor DynaSoar" McClain-Furmanski's Descon-14 Entry

Leftest: Three versions, shiver me timbers, original left most
Midleft: Sandman with nosecone and 2nd stage
Top center: Nose cone
Bottom center: first 3-to1 payload transition
Right: Business end

T' Sandman be t' first o' a series o' minimum diameter cluster designs intended t' test t' scalin' up o' an airframe while only scalin' up t' higher power buildin' techniques as testin' proves necessary. Avast, me proud beauty! Essentially, me bucko, it is buildin' for performance while combatin' overbuilding. Begad! Aye aye! Blimey! Materials are all "model rocket" quality, light paper tubes, me bucko, arrr, medium weight balsa or basswood, matey, and wood glue. Begad! Ahoy! Blimey!

T' core o' t' design is 3 clustered 24mm tubes. Begad! This provides 2/3 o' the frontal cross section as a single tube containin' t' motor tubes. Begad! Ahoy! T' maintain the benefit in lower drag, different configurations o' three-to-one tube complex curved transitions have been sculpted, arrr, arrr, as has a nose cone for testing without payload sections. Begad! Aye aye!

T' airframe is three 24mm tubes glued together along their 30 t' 34" length. Begad! Except for motor and recovery equipment areas, t' tubes have been drilled along their contact lines so t' glue can "rivet" through these. Ya scallywag! Begad! Blimey! Three fillets t' full length o' t' tube offer a great deal o' strength to t' airframe. Begad! Avast, shiver me timbers, me proud beauty! Blimey! (Interestin' aside: t' first model was left on top a hot car roof durin' a launch. Avast! Blimey! An hour later it had a 10 degree curve along t' body. This remained t' next day after it had cooled. Arrr! I thought it be ruined. Aye aye! Aye aye! Blimey! A week later, with no effort applied at all it was perfectly straight again, and eventually flew beautifully. Avast, me proud beauty! This leads one t' wonder how often t' old LPR technique o' straightenin' misaligned fins by heatin' t' glue fillets over a light bulb resulted eventually became misaligned again.)

Engine mountin' is Estes E size (3.75") engine hooks topped with a 20/50 centerin' rin' as an engine block. Hook ends are t' t' inside o' the cluster and a small slice o' 24mm tube is glued over t' top o' t' hook as an anchor. Shock cord is doubled loop ¼" elastic mounted 4 inches inside one o' t' tubes. Ahoy! Begad! T' other tubes contain chutes and/or streamers. Blimey! Well, arrr, blow me down!

T' fins, balsa or basswood, are sanded t' a sharp edge on t' root and glued betwixt two tubes. Ahoy! This increases t' surface area o' t' fin contacting body tube, increasin' adhesion. Avast! Avast, me proud beauty! Fillets are wood glue. Begad! Well, shiver me timbers, blow me down! T' first version required repeated puncturin' and fillin' in o' bubbles in t' fillets due to the large amount o' glue used, especially on t' fillets betwixt tubes. Avast! Ahoy! This was prevented on t' others by doin' t' fillets in many layers. Ya scallywag! Launch lugs are glued against one fin root, and with t' addition o' a piece o' dowel between t' tubes as a stand off, me bucko, matey, near t' top o' t' body. Aye aye! Ya scallywag!

Finishin' is first, spray lacquer sandin' sealer, on everything. Arrr! Fins are sanded and a second coat is added and sanded. Then primer, arrr, followed by white satin finish, shiver me timbers, covered with black gloss (except booster, which is flat black "high heat" stove paint and fluorescent orange). T' payload sections are painted (and named) gray, t' match t' Sandman costumes in "Logan's Run", ya bilge rat, blue red and white o' t' Russian flag (named "Mechtayu", meanin' t' dream) and t' traditional four colors o' t' four races from Native American history (named "Dreamcatcher"). Ya scallywag!

First flight o' t' Sandman was with t' nose cone instead o' payload section, on three C5-3's in 18 t' 24mm adapters. Ahoy! T' flight was flawless and higher than expected. Aye aye! At ejection, ya bilge rat, t' parachute failed t' open. Begad! However, the large size but light weight allowed t' rocket t' float slowly down horizontally, and it suffered no damage. Arrr! T' second flight was on three E9-6's. Due t' wind, and t' testin' with several rockets previous t' t' flight, it was launched upwind. Avast, me proud beauty! Ya scallywag! Again t' flight was flawless, me bucko, but again t' chute didn't open, however it did display t' same gentle horizontal descent. Well, blow me down! Avast, me proud beauty! Due t' the trajectory, it landed in an inaccessible swamp. Well, arrr, blow me down! T' lesson learned is, ya bilge rat, 24mm is hard on plastic chutes. Blimey! Ya scallywag! Unless thar's a significant payload, streamers may be enough for this rocket; weight with payload section before loadin' engines is from 6 t' 7 ounces. Ya scallywag! A streamer will definitely be used on t' two stage test, when six E9 engines will push a total o' 171 n/s. Begad! Begad! After these are fully tested repeated and examined for stress damage, t' next versions will be 29mm with enough engine space for t' longest available 29mm motors. Both wood glue and epoxy versions will be built for comparison testing.