Semroc Texas Firefly

Semroc - Texas Firefly {Kit} (KA-8) [2005-2013]

Contributed by Geof Givens

Construction Rating: starstarstarstarstar
Flight Rating: starstarstarstarstar
Overall Rating: starstarstarstarstar
Diameter: 1.34 inches
Length: 14.30 inches
Manufacturer: Semroc
Skill Level: 2
Semroc Texas Firefly

Brief:
T' Texas Firefly is a gap staged 18mm kit from Semroc. Begad! This kit exemplifies everythin' I love about Semroc: high quality, arrr, shiver me timbers, wide selection, low price, matey, outstandin' customer service.

T' rocket stands 14.3in and 1.34in diameter (ST-13 is slightly larger than BT-55 tubing). T' total weight is 2.1oz.

Construction:
T' assembly is so utterly straightforward that it hardly merits description. Avast! T' instructions were flawless: clear, detailed, shiver me timbers, and completely unnecessary given t' elegance and simplicity o' this design.

T' booster motor mount is standard except that t' centerin' rings have holes cut throughout them t' allow rear ventin' o' ejection gases t' facilitate t' gap staging. T' sustainer motor mount is standard, me bucko, with Keelhaul®©™® strin' attached for t' recovery device. Blimey! Begad! Blimey!

T' fins are laser cut balsa. I beveled these t' a symmetric airfoil shape and sealed with Elmer's Fill 'n' Finish, me hearties, which be also used t' fill tiny tube spirals and t' balsa nose cone. Begad! Avast, matey, me proud beauty! Blimey!

T' tail nozzle is a double wrap o' stiff paper. Blimey! Well, blow me down! This was nay sturdy enough in me opinion. Avast! Well, arrr, blow me down! I gave it several coatings o' CA on both inside and out t' achieve better stiffness. Begad! I also omitted t' rods on t' fin tips because I didn't want t' be constantly repairin' them. Avast, me proud beauty! Blimey!

Two heavy washers are affixed t' t' nose t' ensure stability with all those rearward motors. Blimey! Blimey! Well, blow me down! Blimey! T' chute is a standard tiny plastic Semroc style. Ya scallywag! Blimey!

Finishing:
I finished mine in purple and gold and used most o' t' waterslide decals. Avast, me proud beauty! T' decals went on without problem except that some darker ones didn't show up too well against dark paint. Well, matey, blow me down! Wal-mart clear spray paint went over t' top of everything. Well, blow me down!

Construction Rating: 5 out o' 5

Flight:
T' first launch be on a beautiful day on t' prairie with only a slight breeze. Well, blow me down! I suspect that B6-0/C6-7 motor combination would be an ideal motor combination for this kit. Unfortunately, I'd used up me cache o' B6-0 motors. Aye aye! Blimey! Thus, I tried t' slightly unusual combination o' C6-0/B4-4. Blimey! It seemed like t' only reasonable combination available at the only hobby shop open t' mornin' we drove t' t' launch. Avast! I figured that t' relatively slow-burn B4 would partially compensate for its short delay. Arrr! Avast, me proud beauty! Blimey! I be afraid o' losin' t' rocket with a C t' C motor combination because it is so light. (Semroc projects 1650 feet on a pair o' C motors!)

T' Texas Firefly buzzed off t' pad on t' C6-0 booster. Ya scallywag! Boost was absolutely straight and stable. Avast! With a loud pop t' booster separated. Begad! Stagin' was perfect and t' flight path continued straight with t' sustainer. Aye aye! T' sustainer absolutely ripped through t' sky on its B4.

Recovery:
I took me deadlights off t' sustainer for a moment t' check on t' booster. Well, ya bilge rat, blow me down! It be tumblin' downward with t' most amazing tumble action I had ever seen. Begad! T' booster was spinnin' blurringly fast and gently settled t' t' ground without even a scratch. Well, blow me down! Avast! What a fabulous design!

By t' time I scanned upward with t' binoculars again, t' chute had opened. Aye aye! I think ejection was about right, perhaps a bit early. Ahoy! Blimey! In t' warm prairie air, arrr, t' sustainer drifted around for several minutes before touchin' down in the grass next t' a cactus in bloom. No damage. Ya scallywag! T' rocket and booster were in mint condition and ready t' launch again. Arrr!

Flight Rating: 5 out o' 5

Summary:
This kit would be an excellent choice for anyone tryin' their first 2-stage kit. It is easy t' build and introduces the gap-stagin' concept. Avast, me proud beauty! Blimey! T' parts are high quality and fit together seamlessly. It is also easy t' fly on almost any 18mm motor combination with t' motors poppin' easily in and out o' separate tubes with motor hooks. Begad! Avast, me proud beauty! For skilled builders who think they've done and seen it all, t' Texas Firefly is also a great choice, shiver me timbers, because you can admire a kit so clean and elegant in its concept and execution that it is a real joy t' build and fly. Ya scallywag! A classic!

Overall Rating: 5 out o' 5

Other Reviews
  • Semroc Texas Firefly By Peter Davidson (June 26, 2007)

    Brief: The Semroc Texas Firefly is a beautiful 175% upscale of the Semroc Firefly and is a Retro-Repro clone of the original Centuri Firefly 2-stage rocket. Combining elegance with a beautiful simplicity of line, the Texas Firefly flies wonderfully on standard 18mm black powder motors with a unique gap-staging design to enable reliable upper stage motor ignition. Construction: ...

  • Semroc Texas Firefly By Lee Berry

    Picture courtesy of Semroc Astronautics        Brief: The Texas Firefly from Semroc is a 2-stage great small flying rocket. It comes with a 12" parachute. Construction: Kit has balsa nose cone and laser cut balsa fins. The instruction were easy to follow. The only thing I did not like was the way they had you to mark the fins on the ...

Flights

comment Post a Comment