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, ya bilge rat, rendered in Rocksim..
1simpic


T' rocksim export, next t' a picture o' t' actual Rocket
2simpic


I tested several battery configurations t' determine t' lightest possible reliable combination. Avast, shiver me timbers, me proud beauty! Apparently, 3 AAA cells is sufficient t' light an Estes ignitor if they are fresh. Ya scallywag! I be 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. Arrr! 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)

DSC00941

T' humble beginnings o' t' booster, me bucko, pretty simple, me bucko, a bulkhead placed in t' bottom o' a short piece o' fibre glass tube, arrr, with a short piece o' coupler t' attach it t' t' sustainer. 5 minute epoxy holds it all together...
DSC00943


Different angle, same part.. Avast, shiver me timbers, me proud beauty! I will likely nuke this page later, as it adds no content..
DSC00944


Wow, 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, ya bilge rat, the marks were then transfered t' t' sustainer, and t' booster, arrr, t' located t' fins and t' booster motor tubes..
DSC00945


T' almost finished booster...T' motors(24mm) will be retained with maskin' tape, and use a maskin' tape thrust rin' as well. Avast, me proud beauty! Ya scallywag! T' booster has 3 24mm motor tubes, me hearties, and should provide enough power t' get it off the pad safely. Ya scallywag! Aye aye! T' nose cones will be attached with 12" nylon cord scavenged from ear plugs.

DSC00947


MMM, ya bilge rat, me bucko, more angles..
DSC00948


All put together..You can see t' sustainer motor assembley next t' it, wow huh! Blimey!

DSC00949

This be t' 24mm sustainer motor mount. Well, blow me down! Blimey! As it is aft eject, it is removable. Well, blow me down! Blimey! You may notice t' clips on the bottom, hopefully they will carry t' current which will light t' sustainer motor. At apogee, ya bilge rat, t' engine assembly will be ejected, shiver me timbers, 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. Ya scallywag! Arrr! Each o' t' engine assemblies also features an eyebolt t' attach it t' t' shock cord. Begad! They were constructed with wood glue, matey, as opposed t' epoxy.
DSC00950


This would be t' battery bay, me hearties, it will fit all t' batteries I want, along with t' perfectFlight Timer, me hearties, with loads o' room t' spare. Well, blow me down! Ahoy! This is inserted in t' top o' t' airframe, and held in with a piece o' coupler (glued inside), and secured on t' other side by t' NC, arrr, which is held on with 2 screws for flight. Arrr! You may notice, shiver me timbers, thar is an eyebolt attached, arrr, as this is where t' shock cord is attached t' t' rocket.
DSC00951


There be 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...
DSC00952


This would be t' inside o' t' airframe. Avast! Notice t' couplers, me bucko, one basically acts as a thrust ring, while the other keeps t' battery bay in t' airframe.
DSC00953


MMMM Fillets...the airframe was roughed up quite a bit prior t' applyin' t' epoxy.
DSC00954


T' bottom was removed from t' NC t' provide a little more room.
DSC00957


Just after bein' primed, t' rocket took on a little damage, a la kidsamine... Avast! Blimey! All better now...
DSC00989


All ready t' go, shiver me timbers, me bucko, also in t' picture is a 29mm motor mount, shiver me timbers, so t' sustainer can fly on it's own..

DSC01012


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, as opposed t' epoxy.
DSC01017


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

comment Post a Comment