Semroc SLS Arcas

Semroc - SLS Arcas {Kit} (KS-5)

Contributed by Mark H

Construction Rating: starstarstarstarstar
Flight Rating: starstarstarstarstar_border
Overall Rating: starstarstarstarstar
Diameter: 2.25 inches
Manufacturer: Semroc
Skill Level: 3
Style: Scale

semroc_sls-arcas_partsBrief:
A 1/2 scale model o' t' Atlantic Research Corporation soundin' rocket produced in t' 1950s and 1960s.

Construction:
T' kit contains two BTH-70 sized body tubes, ya bilge rat, laser cut basswood fins, arrr, and balsa nose and tailcones. Arrr! Ahoy! T' motor mount is 29 mm with plywood centerin' rings. Fin assemblies also include root plates and hex bolt heads that are t' be glued t' t' root plates. Aye aye! Blimey! A baffle and a 24 inch nylon parachute are included. Well, blow me down! A 24 mm engine mount adapter is included. All components are high quality.

semroc_sls-arcas_tailconeT' kit instructions are straight forward and allow for t' option o' buildin' this kit t' launch on up t' high power H motors. Overall this is an easy build with t' highlight bein' t' fin and tail cone assembly. Use o' epoxy on centerin' rings, fins and engine mount is recommended if t' model is intended for high power applications. Ya scallywag! Blimey! Since this is a scale kit t' directions provide fin dimension for sandin' t' cross section t' scale. In and effort t' save time sandin' when preparin' t' basswood fins, I elected t' sand me fins with only rounded leadin' and trailin' edges. T' fins also have cut-outs along t' root edge where t' simulated bolt heads are attached. Ahoy! Blimey! Although I used epoxy on t' centerin' rings, for t' rest o' t' fins and tailcone assembly, I used wood glue and t' result be surprisingly rigid. Begad! Blimey! Blimey! Blimey! Since t' kit is promoted as bein' able t' fly on up t' H motors, I thought t' 3/16 inch lugs were small for this kit and decided t' use 1/4 inch lugs. Blimey! Blimey! Arrr! Blimey! Approximately 5 1/2 feet o' tubular elastic shock cord be provided t' which I added another 3 feet o' elastic cord. Ya scallywag! Blimey! Avast, me proud beauty! Blimey! One item t' note is that with t' balsa tail cone thar be no allowance for use o' positive retention methods. Begad! Blimey! I, matey, matey, myself, am a fan o' friction fittin' even when usin' 29 mm composite motors.

semroc_sls-arcasFinishing:
T' color scheme on t' cover art shows t' round pictured in NASA photo 63-Arrrrrrrcas-1. T' red and white color scheme presents a bit o' a challenge in tryin' t' match t' curvature o' t' red nose section and vertical striping. I elected t' fill t' fins and nose cone with sandin' sealer and t' tailcone with Elmer’s Fill-N-Finish®. Well, blow me down! Begad! After primerin' and sanding, I was pleased at t' two colored finish. Ya scallywag! Begad! T' large black lettered ARCAS decal was easy t' apply.

Construction Rating: 5 out o' 5

Flight:
Recommended motors are D12-3 through H128-10

T' included baffle is a plus for ease o' flight preparation that is somewhat offset by t' required friction fittin' motor retention. Well, blow me down! An added wrap o' tape at t' engine tailcone joint is made difficult by t' aft tail ring, so give t' motor a good tug t' make sure it is secure.

I first flew t' Arrrrrrrcas at NARAM 50 on an E16-4W. This flight was relatively slow liftin' off t' about a 700 foot altitude. Begad! Subsequent flights on F20-7W and F21-8R Econojet motors provided much quicker liftoffs, me hearties, straight as an arrow t' impressive altitudes o' over 1000 feet. Ahoy! If launchin' on an H motor expect flights well in excess o' 2000 feet.

semroc_sls-arcas_allenginesgoRecovery:
T' 24 inch parachute provides a slow decent so if launchin' with larger motors, expect some drifting.

Flight Rating: 4 out o' 5

Summary:
A strikin' large mid power kit, me bucko, ya bilge rat, with excellent Semroc quality and value. T' tailcone and fin assembly are a conversation piece.

Overall Rating: 5 out o' 5

 

Flights

Comments:

avatar
M.G. (August 16, 2008)
I built my Arcas about three months ago. I finally flew it on 8-13-08. It was a fun build. I built mine with wood glue and it is very solid. I flew it twice with D-12's and it went higher than I thought. Semroc says 225 feet with a D, that seems right, maybe a little higher even.

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