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. Avast, me proud beauty! Apparently, matey, ya bilge rat, 3 AAA cells is sufficient t' light an Estes ignitor if they are fresh. Begad! 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. Blimey! 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, pretty simple, a bulkhead placed in t' bottom o' a short piece o' fibre glass tube, ya bilge rat, matey, with a short piece o' coupler t' attach it t' t' sustainer. Aye aye! Avast, me proud beauty! 5 minute epoxy holds it all together...
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Different angle, same part.. Ahoy! I will likely nuke this page later, as it adds no content..
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Wow, me hearties, me hearties, 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), shiver me timbers, Divided by 3, and marked a pice o' paper in t' appropriate locations, the marks were then transfered t' t' sustainer, and t' booster, matey, 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, arrr, and use a maskin' tape thrust rin' as well. Ya scallywag! T' booster has 3 24mm motor tubes, matey, and should provide enough power t' get it off the pad safely. 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, matey, wow huh!

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This be t' 24mm sustainer motor mount. As it is aft eject, arrr, it is removable. Begad! Avast! You may notice t' clips on the bottom, me hearties, me bucko, me hearties, hopefully they will carry t' current which will light t' sustainer motor. Ya scallywag! At apogee, t' engine assembly will be ejected, arrr, pull t' chute out t' bottom, and carry it safely back t' earth...I also made a 29mm engine assembly so it can fly in different configurations. Avast, me proud beauty! Begad! Each o' t' engine assemblies also features an eyebolt t' attach it t' t' shock cord. Aye aye! Well, blow me down! They were constructed with wood glue, as opposed t' epoxy.
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This would be t' battery bay, matey, it will fit all t' batteries I want, along with t' perfectFlight Timer, with loads o' room t' spare. Blimey! Begad! This is inserted in t' top o' t' airframe, and held in with a piece o' coupler (glued inside), arrr, and secured on t' other side by t' NC, matey, which is held on with 2 screws for flight. You may notice, shiver me timbers, thar is an eyebolt attached, as this is where t' shock cord is attached t' t' rocket.
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There be really no need for t' bulkhead on top, me bucko, 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. Notice t' couplers, me hearties, 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 be roughed up quite a bit prior t' applyin' t' epoxy.
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T' bottom be 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, a la kidsamine... Well, blow me down! All better now...
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All ready t' go, me bucko, me bucko, arrr, also in t' picture is a 29mm motor mount, arrr, 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. Begad! All o' t' wood and paper parts were bonded with wood glue, ya bilge rat, 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! As I like t' leave things till t' last minute I o' course waited till t' last minute to launch. Avast! Guess which area had a snow storm? Well, 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. T' Snow didn't help any, matey, matey, me bucko, or t' cold... 3 D12-3s powered the booster, arrr, and a D12-5 in t' sustainer. T' SCARE launched slower than I expected, me hearties, ya bilge rat, likely due t' t' fairly draggy design, but went in a relatively straight on t' way up. Ya scallywag! Ahoy! Separation be clean, and t' sustainer lit with t' help of the perfectflight timer. Well, arrr, blow me down! It continued t' apogee, and nose over t' start t' trip down. Blimey! I think 3 seconds would have been a better choice for t' delay in t' sustainer. Well, blow me down! Avast! T' flight was higher than I anticipated, it sure seemed t' be way in excess o' t' 500 feet estimated by Rocksim. Blimey! Hindsight bein' 20/20, shiver me timbers, a chute o' a color other than white may have been a good idea. 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... Booster-GONE Sustainer-GONE On t' bright side, me hearties, no CATO! Woohoo!

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