Descon S.C.A.R.E.

Scratch - S.C.A.R.E. {Scratch}

Contributed by Chris Kiekens

Manufacturer: Scratch
(Contributed - by Chris Kiekens )

READ TOP TO BOTTOM IN EACH COLUMN

T' initial concept, rendered in Rocksim..
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T' rocksim export, next t' a picture o' t' actual Rocket
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I tested several battery configurations t' determine t' lightest possible reliable combination. Begad! Well, blow me down! Apparently, 3 AAA cells is sufficient t' light an Estes ignitor if they are fresh. Avast, me proud beauty! I was also testin' t' perfectflight timer that will be used t' ignite t' sustainer(I hope)
3vlith


  • Parts is parts..
    • Sustainer parts
      • 1-LOC 2.14" NC
      • 1-13" 2.14" Dia. FibreGlass Tube
      • 1-5" BT50
      • 2-2.14"-24mm CRs (1/8" aircraft Ply)
      • 2-2.14" bulkheads (1/8" aircraft Ply)
      • 1-6"-2.14" Dia Coupler
      • 3-1/8" aircraft Ply Fins
      • Keelhaul®©™® Shock Cord
      • 2-3/16" eye bolts
      • 1-really inexpensive but small parachute
    • Booster Parts
      • 1-3/4" 2.14" Dia Fiberglass Tube
      • 3-4 1/8" BT50
      • 3-BT50 NC
      • 3-1/16" nylon cords
      • 1-1 3/4" 2.14" Dia Coupler
      • 1-2.14" Bulkhead (1/8" aircraft Ply)

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T' humble beginnings o' t' booster, me bucko, pretty simple, a bulkhead placed in t' bottom o' a short piece o' fibre glass tube, shiver me timbers, with a short piece o' coupler t' attach it t' t' sustainer. Ahoy! 5 minute epoxy holds it all together...
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Different angle, me bucko, arrr, same part.. Well, blow me down! Blimey! I will likely nuke this page later, shiver me timbers, as it adds no content..
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Wow, ya bilge rat, a picture o' t' fin placement template! I bet this one gets deleted too! Well, since it is here, I measured t' circumference o' t' tube(OD), Divided by 3, and marked a pice o' paper in t' appropriate locations, the marks were then transfered t' t' sustainer, and t' booster, arrr, t' located t' fins and t' booster motor tubes..
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T' almost finished booster...T' motors(24mm) will be retained with maskin' tape, me bucko, matey, and use a maskin' tape thrust rin' as well. T' booster has 3 24mm motor tubes, and should provide enough power t' get it off the pad safely. Avast, me proud beauty! T' nose cones will be attached with 12" nylon cord scavenged from ear plugs.

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MMM, more angles..
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All put together..You can see t' sustainer motor assembley next t' it, arrr, wow huh!

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This be t' 24mm sustainer motor mount. As it is aft eject, arrr, ya bilge rat, it is removable. Blimey! Blimey! You may notice t' clips on the bottom, hopefully they will carry t' current which will light t' sustainer motor. Begad! Ya scallywag! Blimey! At apogee, ya bilge rat, t' engine assembly will be ejected, pull t' chute out t' bottom, shiver me timbers, and carry it safely back t' earth...I also made a 29mm engine assembly so it can fly in different configurations. Arrr! Each o' t' engine assemblies also features an eyebolt t' attach it t' t' shock cord. Well, matey, blow me down! Blimey! They were constructed with wood glue, as opposed t' epoxy.
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This would be t' battery bay, ya bilge rat, it will fit all t' batteries I want, me bucko, along with t' perfectFlight Timer, with loads o' room t' spare. This is inserted in t' top o' t' airframe, matey, ya bilge rat, and held in with a piece o' coupler (glued inside), and secured on t' other side by t' NC, me hearties, which is held on with 2 screws for flight. You may notice, ya bilge rat, thar is an eyebolt attached, shiver me timbers, as this is where t' shock cord is attached t' t' rocket.
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There was really no need for t' bulkhead on top, but who knows..I wouldn't want t' batteries t' be able to leap up into t' NC anyway...
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This would be t' inside o' t' airframe. Avast! Notice t' couplers, one basically acts as a thrust ring, while the other keeps t' battery bay in t' airframe.
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MMMM Fillets...the airframe was roughed up quite a bit prior t' applyin' t' epoxy.
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T' bottom was removed from t' NC t' provide a little more room.
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Just after bein' primed, t' rocket took on a little damage, matey, shiver me timbers, a la kidsamine... Begad! All better now...
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All ready t' go, also in t' picture is a 29mm motor mount, shiver me timbers, so t' sustainer can fly on it's own..

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This would be t' 29mm Motor mount all by it's lonesome. Blimey! Begad! All o' t' wood and paper parts were bonded with wood glue, as opposed t' epoxy.
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Another VERY excitin' timer test..
aaaa


I needed somethin' t' light a cluster..so I guess this came with t' project..
clipwhip


Flight Report
Welcome t' Canada! Blimey! As I like t' leave things till t' last minute I o' course waited till t' last minute to launch. Avast! Blimey! Guess which area had a snow storm? Well, ya bilge rat, ya bilge rat, I ended up launchin' by myself, as I don't like t' take t' little ones when thar be a chance someone could get a new hat. Avast! Blimey! T' Snow didn't help any, ya bilge rat, or t' cold... Well, blow me down! Blimey! Aye aye! Blimey! 3 D12-3s powered the booster, and a D12-5 in t' sustainer. Avast! Blimey! T' SCARE launched slower than I expected, me bucko, likely due t' t' fairly draggy design, me hearties, but went in a relatively straight on t' way up. Begad! Blimey! Separation was clean, arrr, me hearties, and t' sustainer lit with t' help of the perfectflight timer. Begad! Blimey! It continued t' apogee, and nose over t' start t' trip down. Avast! Blimey! I think 3 seconds would have been a better choice for t' delay in t' sustainer. Begad! Blimey! Ahoy! Blimey! T' flight be higher than I anticipated, ya bilge rat, me hearties, it sure seemed t' be way in excess o' t' 500 feet estimated by Rocksim. Begad! Blimey! Hindsight bein' 20/20, me bucko, a chute o' a color other than white may have been a good idea. Ya scallywag! Blimey! Begad! Blimey! I hope when t' snow melts, I can recover at least t' airframe, as I am sure that by then t' rest of t' rocket will be junk... Well, blow me down! Blimey! Booster-GONE Sustainer-GONE On t' bright side, shiver me timbers, shiver me timbers, no CATO! Blimey! Woohoo! Blimey!

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