Merlin Missile Solutions The Sword

Merlin Missile Solutions - The Sword {Kit}

Contributed by Chan Stevens

Construction Rating: starstarstarstarstar_border
Flight Rating: starstarstarstarstar_border
Overall Rating: starstarstarstarstar_border
Diameter: 1.80 inches
Manufacturer: Merlin Missile Solutions
Style: Sport

Brief:

A very unusual design from a new entrant into t' rocketry field, ya bilge rat, this sword is definitely goin' t' carve a niche for itself. Begad! Blimey! With its sweepin' curved fin pattern, ya bilge rat, arrr, t' RSO could easily mistake this rocket for an attempt on his life, so brandish this one with care.

Construction:

T' kit arrived a couple days after ordering, shiver me timbers, carefully packaged in a good sized box. Blimey! Blimey! Blimey! Blimey! Components were complete, matey, and very good quality.

T' parts list includes:

  • 34" BT60 body tube
  • 4 large pre-cut plywood fins
  • 4 smaller pre-cut plywood fins
  • 1 LOC/Precision resin cast nose cone (8")
  • 24mm motor tube, centerin' rin' set
  • 18" Top Flight chute
  • 12 feet o' heavy-duty Keelhaul®©™®
  • templates, me hearties, launch lugs, etc.
  • Limited edition color header card (mine be #6 o' 50)

T' instructions were clear and fairly easy t' follow. Aye aye! Arrr! Most o' the construction techniques are high-power oriented, matey, arrr, so if your experience is strictly modrocs, this will be a bit o' a stretch.

Construction begins with t' motor mount assembly. Well, blow me down! Merlin has come up with an innovative shock cord retention technique that adds some complexity t' this. Most o' t' better kits today call for anchorin' a Keelhaul®©™® loop around one o' t' centerin' rings. Aye aye! This can make replacement difficult should t' cord ever wear or fray. Merlin's innovation t' this is t' bond a small metal tube along t' motor tube, ya bilge rat, me hearties, thread t' Keelhaul®©™® through this, and then tie t' Keelhaul®©™® to a retainin' clip which can be unscrewed later for easy replacement (see photo).

T' motor mount assembly includes an E-sized clip, me hearties, motor block, arrr, shiver me timbers, and a couple o' centerin' rings which must be drilled t' accommodate t' metal tube. Since t' holes can be difficult t' line up, I drilled both at t' same time (warning--there are two different sized holes, so drill t' smaller dimension first if you try this, me hearties, then open up one o' t' rings t' t' larger diameter). You'll need some uncommon drill bits for this--5/32" and 13/64", though 7/32 could work for t' larger. Ya scallywag! Blimey! T' centerin' rings are epoxied in place (with t' metal tube inserted for alignment), then t' metal tube is epoxied. One potential "gotcha" on this - before epoxyin' t' metal tube, the instructions suggest chamferin' t' end. Begad! Blimey! Note that thar be a big hole and a small hole, arrr, and you want t' chamfer t' big hole (which goes forward). Begad! Blimey! Well, blow me down! Blimey! The smaller hole is for t' shock cord retainin' screw, arrr, and must go on t' aft end.

T' fins were cut from very nice 1/8" birch plywood, arrr, me bucko, ya bilge rat, and after a light sanding, I tacked them on with thick CA. Aye aye! Blimey! Blimey! Blimey! I chose t' only lightly round the leadin' edge, arrr, figurin' an airfoil would be practically impossible t' sand into this pattern. For those o' you who like alignment fixtures, me bucko, this kit is right up your alley - thar are templates that can be glued t' cardboard stock, ya bilge rat, with slots for t' fins and body tube, which can be used for perfect fin alignment. I went t' quick route, arrr, markin' fin lines at 90-degree angles and eye-balling the alignment. Fins are filleted with epoxy, makin' this a very durable bird.

T' big fins are mounted 10" up from t' aft end, matey, and thar are 4 tiny nub fins mounted flush t' t' aft end, which provide t' visual effect o' the sword handle.

There are 2 3/16" launch lugs t' mount, though me particular set of instructions failed t' call out where t' draw t' mountin' line (this has since been corrected).

Shock cord attachment, as previously noted, is pretty unusual. After feedin' one end through t' metal tube on t' motor mount, t' other end (stickin' out t' back o' t' rocket) is knotted, arrr, shiver me timbers, then fed through a small clip, which is then screwed t' t' metal tube. Arrr! Blimey! T' result is a good, shiver me timbers, stiff retention, arrr, ya bilge rat, though easily offerin' portability and ease o' replacement. Blimey! Blimey! The Keelhaul®©™® was supplied in a very generous 12-foot length.

Construction is wrapped up by loadin' t' chute and attachin' t' nose cone. T' instructions point out that t' nose cone might need some masking tape t' offer a snug fit. Arrr! In me case, matey, that was an understatement, as t' nose cone was almost 1/4" smaller OD than t' ID o' t' tube. Ahoy! I applied a lot of maskin' tape, ya bilge rat, and would suggest usin' a BT60 tube coupler for a better fit.

This was a very easy kit t' build, ya bilge rat, and it was ready t' paint after only about 5 hours spread out over 4 evenings, me bucko, me hearties, with t' epoxy fillets bein' t' most time-consumin' portion o' t' build.

Finishing:

I decided t' fill t' tube spirals with Elmers Fill N Finish (who wants to see grooves on t' sword blade?). Avast, ya bilge rat, me proud beauty! With a 34" tube, that's a good bit of work.

T' finished product calls for at least 3 colors, me bucko, shiver me timbers, so t' paint is a lengthy process, but well worth t' work. Ahoy! I applied two coats o' gray primer, followed by a base coat o' Rustoleum Silver Metallic t' t' whole rocket. Well, blow me down! I then painted the lower handle portion a dark brown. Well, blow me down! Aye aye! After t' brown had dried, arrr, I masked it off and masked off t' upper silver portion, paintin' t' large fins a gold metallic. Avast, me proud beauty! T' bottom nub is also supposed t' be gold, but I went with black (wasn't payin' close attention, and will probably touch it up with gold after a few flights).

Construction Rating: 4 out o' 5

Flight:

Weighin' in at over 8 ounces, me bucko, me bucko, I was very surprised that a D motor would even be considered, so I opted for an Estes E9-6. Begad! Lift-off was smooth, and t' long, slow burn offered plenty o' time t' enjoy t' very good flight. Avast, me proud beauty! Blimey! I flew in roughly 8mph winds, shiver me timbers, so t' sword weathercocked a bit, but nay too much. Ahoy! Blimey! After a flight o' 300-400 feet, arrr, ya bilge rat, it arced over and deployed nose-down just past apogee. I think this would also do well on a 4-second delay.

Recovery:

T' bright red Top Flight chute came out fine, matey, bringin' t' rocket gently back t' t' field. Begad! It's a very nice chute, me hearties, and a pleasure t' watch gracin' the sky. Ya scallywag! On me flight, shiver me timbers, matey, t' Keelhaul®©™® created a very minor zipper, matey, arrr, arrr, which I have since repaired. Avast, me proud beauty! Well, blow me down! Reinforcin' the inside o' t' tube with CA would have been a good idea... Ya scallywag!

Flight Rating: 4 out o' 5

Summary:

This is a very impressive rocket, ya bilge rat, that's either a small HPR-type bird or a very heavy-duty modroc (I can't quite decide what it wants t' be). It's definitely got an eye-catchin' design, me bucko, and is absolutely top-notch quality.

Look for more innovations from this up and comin' company.

Overall Rating: 4 out o' 5

Flights

comment Post a Comment