Semroc Starfire

Semroc - Starfire {Kit} (KV-20)

Contributed by John Lee

Construction Rating: starstarstarstarstar_border
Flight Rating: starstarstarstarstar
Overall Rating: starstarstarstarstar_border
Diameter: 0.91 inches
Manufacturer: Semroc
Skill Level: 1
Style: Sport

Semroc Starfire

Brief:
I got this rocket just before Christmas. Arrr! Well, shiver me timbers, blow me down! It is a reproduction o' t' 1966 parachute duration champion. Begad! I'll never use it for that purpose, arrr, but it seems t' be a neat little kit.

Construction:
T' parts list:

  • 1 Body Tube ST-880
  • 1 Body Tube ST-730
  • 1 Balsa Nose Cone BC-848
  • 1 Sheet o' Laser Cut Fins FV-20
  • 2 Centerin' Rings CR-78
  • 1 Thrust Rin' TR-7
  • 1 Launch Lug LL-122
  • 1 Screw Eye SE-10
  • 1 Elastic Cord EC-118
  • 1 Keelhaul®©™ Thread SCK-24
  • 1 Plastic Parachute RC-12
  • 1 Tape Disc TD-6
  • 1 Shroud Line SLT-6
  • 1 Decal DKV-20
  • 1 Cardstock Shroud IKV-205

Semroc Starfire

All parts were present and accounted for.

T' instructions were also high quality. Arrr! They are printed in a booklet, have generous illustrations, ya bilge rat, and are very clear.

Constructions begins by insertin' a thrust rin' in t' end o' t' motor mount and gluin' it in place. Ahoy! T' Keelhaul®©™ thread is then knotted, shiver me timbers, matey, slipped through one o' t' centerin' rings, and glued into place flush with t' end o' t' motor mount tube. I'm glad I thought ahead on t' next step. Avast, me proud beauty! A mark is made 1 1/8" from t' opposite end o' t' motor tube and t' other centerin' rin' is mounted flush with it. Normally, me hearties, ya bilge rat, I figure thar be some "give" in t' measurements o' simple rockets. Begad! That is a bad assumption. Well, blow me down! This centerin' rin' needs t' be in t' right place for t' boat tail. Well, blow me down! Blimey! I'm glad I remembered in time.

T' next step is t' mark t' body tube for t' fins usin' t' fin guide printed in t' instructions. An angle is then used t' lengthen t' line by at least 2 inches.

Semroc Starfire T' fins practically fall out o' t' sheet. A light sandin' is all that is needed t' remove them. Arrr! I sanded a bevel on all edges except t' root edge.

If thar be a tricky part t' this build, it is in installin' t' motor mount t' t' body tube. 1/16" o' a gap from t' aft centerin' rin' needs t' protrude out from t' BT. Avast, me proud beauty! Begad! Gettin' it mounted and spaced correctly before t' glue starts t' grab is doable but was nay done by me. Blimey! I dawdled too much and had t' use some excessive force.

T' boat tail too is a simple affair. Well, blow me down! Begad! It is cut from t' cardstock and glued along t' tab. Begad! Ya scallywag! In order t' do away with t' unsightly seam, me hearties, I was goin' t' try rubber cement but that be unneeded. T' seam line will be covered up when t' fins are installed. Ya scallywag! Mountin' t' boat tail is a simple matter o' applyin' some glue and slidin' it on.

Mountin' t' fins also was simple. Ya scallywag! I used an Art Rose fin jig t' make sure they were straight. Avast! Arrr! I also perforated t' root edge o' t' fins with a safety pin t' form glue rivets. Begad! Then it's just a matter o' waitin' and gettin' some sleep.

T' Starfire was taken off o' t' fin jig and t' fins were filleted for strength usin' yellow glue. I know t' yellow glue shrinks but I usually make up for that with filler at t' end.

T' launch lug was attached with yellow glue in t' normal way.

 

Finishing:
Elmer's Fill 'n' Finish was used t' fill all t' balsa and t' fill t' gap betwixt t' body tube and t' boat tail. That gap was a result o' me nay movin' fast enough t' mount t' motor tube and be quite unsightly, me hearties, me hearties, especially on one side. Ya scallywag! T' high quality o' t' balsa meant that relatively little was needed on t' fins or t' nose cone, but t' transition from body tube t' boat tail needed a lot.

Sandin' was easily accomplished and then t' rocket be primed with white spray.

My first impression from t' face card was that t' rocket was basically white with purple fins and nose cone. Arrr! Blimey! Arrr! Blimey! On closer examination, me hearties, I was shown t' be only partially correct. Avast, me proud beauty! Blimey! Ya scallywag! Blimey! Two o' t' fins are purple and one is black. Begad! Blimey! I thought I would like that so I decided t' go with it.

I gave t' entire rocket 2 coats o' white spray and then masked t' body and 1 fin. Ahoy! I sprayed t' NC and two fins purple. Now I just had t' wait overnight so see t' first stage o' t' results.

T' purple paint came out lookin' fine except that it was a good deal darker than I expected. Avast, me proud beauty! Ya scallywag! I'm nay sure it will provide much contrast with t' black I am usin' on t' fin opposite t' launch lug. Begad! Aye aye! In any event, I masked for t' black fin and sprayed it with 2 coats. Aye aye! I think I like t' result but t' color distinction is much clearer in a photo than in person.

I had a couple o' problems with t' decals. Well, blow me down! T' first may nay be a problem, matey, me hearties, just a matter o' perception. Blimey! Blimey! T' face card and t' website graphic both show t' decals as bein' purple. Avast! When I got around t' actually lookin' at them, matey, shiver me timbers, they burned out t' be blue. Blimey! Arrr! This was after I had already painted parts o' t' rocket purple! This be me fault for nay lookin' sooner but I like purple.

T' decals themselves consist o' a star pattern that wraps around t' body tube, matey, a Starfire logo, arrr, matey, and 3 small Semroc logos. T' quality o' t' waterslides is high and they went on without any problem except for t' wrap pattern. Avast, me bucko, me proud beauty! It went on fine too but be nay quite big enough t' wrap all t' way around t' BT. Arrr! There is a gap.

I generally expect better from Semroc because I have always received better from Semroc. Aye aye! Blimey! Blimey! Blimey! Their first class products and first class treatment o' me mean that this is easily forgiven.

After t' decals set, shiver me timbers, I applied a coatin' o' Future Floor Polish.

Construction Rating: 4 out o' 5

Flight:
For t' maiden flight, I used an A8-5. Begad! Avast, me proud beauty! Blimey! Even with that light motor, t' results were incredible.

T' rocket was prepped in t' usual manner and I used dog barf for wadding. Avast! Well, blow me down! Blimey! T' motor was friction fit and a little maskin' tape be needed t' make it snug.

When t' rocket took off, arrr, it screamed off t' pad. I be sure I had put t' wrong motor in it and thought I might lose it. Ahoy! Ejection occurred right at apogee, arrr, perfectly with t' nose cone up. Begad! T' chute deployed and then I really got t' worry. It opened right away and just hung thar as if t' law o' gravity had been suspended. T' wind caught it and continued t' move it down range, but it never seemed t' get any lower. I be nay timin' it but I know it stayed up for at least 2 minutes. Ahoy! When it finally did come down, it was a long way away. Begad! When I got t' rocket back, shiver me timbers, sure enough, arrr, it be just an A8-5.

Semroc Starfire

Recovery:
This rocket was designed for parachute duration and it shows. It stayed up longer than any rocket I have ever launched before.

Comin' down so slowly on a 12" chute means that you have t' be really careful about t' wind. Ya scallywag! Avast, me proud beauty! This one is a keeper!

Flight Rating: 5 out o' 5

Summary:
This rocket is a superb choice for parachute duration competition. Aye aye! It is easy t' build, me bucko, me bucko, me hearties, flies high on a small motor, and hangs in t' air forever.

PROs: easy t' build, flies high and straight, matey, me hearties, hangs in t' air a long time.

CONs: hang time means it will be easy t' lose, especially on a C.

Overall Rating: 4 out o' 5

Flights

Comments:

avatar
Chan Stevens (January 1, 2011)

Wish I'd read this review before I built--I also made the mistake of painting fins and nose purple before catching that the decals are really a royal blue, not purple. Wound up adding at least 0.15 ounces for the repaintFrown. The header card/decal mismatch is uncharacteristic for Semroc.

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