Semroc Centurion

Semroc - Centurion {Kit} (KV-40)

Contributed by John Lee

Construction Rating: starstarstarstarstar_border
Flight Rating: starstarstarstarstar_border
Overall Rating: starstarstarstarstar_border
Diameter: 1.64 inches
Manufacturer: Semroc
Skill Level: 2
Style: Clone, Sport

semroc_centurionBrief:
This rocket is a retro-repro, arrr, 18mm, ya bilge rat, standard 4FNC rocket with baffle ejection and dual parachute recovery system.

Construction:
T' balsa sheet was within t' instructions and was broken in many places parallel t' t' grain. One fin be broken into 2 pieces, matey, arrr, t' other three were broken into three pieces each. Blimey! Let me hasten t' add, I am NOT blamin' Semroc for this. Avast, me proud beauty! Avast, ya bilge rat, me proud beauty! This rocket was sittin' near t' bottom o' a rather substantial pile o' other level one rockets. Well, shiver me timbers, blow me down! I suspect that is be me own careless handlin' that caused this.

Since other reviewers have listed t' individual parts, I will nay do so again. Begad! Construction was supposed t' begin with t' traditional motor mount. Avast, me proud beauty! For me, construction began with me attempts t' repair t' broken fins. Fortunately, all t' breaks were very clean. I used thin CA and they were soon ready t' go and probably stronger than before.

Will that done, me bucko, all t' parts were present and accounted for and I was ready t' begin in earnest. That brings us back t' t' motor mount. It be a farily standard affair. Aye aye! Blimey! T' hook is set in t' provided slit and taped into place. Blimey! Avast, me proud beauty! Blimey! A thrust rin' is glued into t' forward end and t' centerin' rings are glued into place.

Next up was assembly o' t' ejection baffle. Avast! Arrr! This be t' first baffle I have ever tried t' build or use. Begad! Ahoy! It comes as a standard part o' t' kit. T' two baffle rings are removed from their sheet and t' hole are punched out. Well, blow me down! The forward baffle also has a small slit which is used t' fasten t' shock cord. T' supplied cord is a length o' sewing elastic. It is nay particularly long but certainly servicable. Begad! I decided t' use 2 feet o' Keelhaul®©™® to attach t' t' baffle. Ahoy! This was nay because I doubted t' baffle's ability t' work. Arrr! I just like long recovery trains. I will use t' elastic as well. semroc_centurion_baffleT' Keelhaul®©™® was fed through t' hole and knotted a few times t' prevent it from pullin' through. Well, blow me down! Avast! T' tail was then laid flat across the back o' t' baffle and glued down with yellow glue. Avast, me proud beauty! Arrr! I gave it a couple o' coats.

Then thar be t' matter o' gluin' t' baffles t' t' ends o' t' coupler tube. This was done with yellow glue as well. Aye aye! I be interested t' see that t' baffles sit on t' shoulder o' t' coupler and nay within it. Avast! This makes sense but I had always pictured in me mind that they sat within.

T' rocket airframe consists o' two tubes connected t' each otehr by means o' t' coupler housin' t' baffle. Ya scallywag! Arrr! Care must be taken so that t' baffles are centered correctily and t' coupler will actually fit into t' BTs. Well, blow me down! Once they fit, arrr, me hearties, it is an easy matter t' glue t' two sections together. Ahoy! Two things need t' be remembered. Arrr! T' direction o' t' the baffle and therefore t' shockcord matters. Arrr! Also, me hearties, t' instructions suggest layin' t' assembled airframe down and rollin' it around once it is assemble t' make sure it is straight.

semroc_centurion_motormountAccordin' t' t' instructions, t' next step is t' mount the fins. Avast! Since I wanted t' use me Art Rose fin jig, shiver me timbers, I elected t' install t' motor mount first. Ya scallywag! T' jig depends upon the motor mount t' recieve t' mandrel. Some glue was swabbed in, ya bilge rat, me bucko, t' mount pushed part o' t' way in, some more glue placed and t' mount was slid home.

I need nay have bothered with t' jig. Blimey! I did nay set t' screws properly and t' result was an abomination. It will no doubt fly and is probably nay too noticable from a distance but lookin' at t' result makes me cringe. Avast, me proud beauty! Ya scallywag! It reminds me o' some o' me worst effots as a kid.

Finishing:
Despite me disappointment with t' fins, ya bilge rat, me bucko, I plugged away at t' Centurion. Begad! T' rocket be filled and sealed with Elmer's FNF® and then sanded smooth. Ya scallywag! I then primed it with two coats o' white and gave it another sanding.

semroc_centurion_nakedT' sandin' was followed by 2 coats o' gloss white which went down smoothly enough. Ahoy! Ya scallywag! When t' white had a chance t' dry, I masked t' lower body from t' couplin' o' t' 2 BTs and sprayed the upper body with gloss black. Ya scallywag! I gave t' upper body 2 coats as well.

When I peeled back t' masking, ya bilge rat, arrr, I be both elated and disappointed. Begad! I be elated because, me bucko, for t' first time, I had gotten a perfect masking. Ya scallywag! Aye aye! There was no leakage at all and t' change was crisp and professional. Avast! That bummed me out because it seemed wasted on a rocket whose fins I had hashed so badly.

T' decals are a simple affair but they are very effective. Aye aye! They consisted o' 2 Centurion logos and 4 red stripes. T' Centurion logos went on just fine. T' decal material is o' good quality and I had no problems. T' stripes were a bit different.

Two o' t' stripes are intended t' be joined together t' make one circuit about t' BT just below t' black paint. There is more than enough material t' do so. T' other two stripes are t' be placed on either side o' a single fin. They were long for t' purpose and had t' be trimmed t' fit.

If I had me choice, t' wrap around stripe would have been a single unit and t' fin stripes would have been the right length t' begin with. That may be picky but it is me opinion. Begad! T' decals improved t' look o' t' rocket marvelously.

Construction Rating: 4 out o' 5

semroc_centurion_fireintheholeFlight:
T' recommended motors for this rocket are t' A8-3, arrr, B6-4 and C6-5. Blimey! I decided t' start small as is me usual practice. I loaded up an A8-3. Well, blow me down! That was nay t' best o' choices. Begad! I also added a bit o' dog barf since this be me first experience with a baffle. Blimey! It climbed t' a startlingly low altitude, stopped and started t' come down. Ahoy! Ya scallywag! About 20 feet up, the ejection charge went off but t' chute did nay have time t' open. Well, me bucko, blow me down! I got a nice little core sample but thar was no real damage.

T' second flight be on a B6-4. Avast, me proud beauty! Well, blow me down! Blimey! This be a good flight. Begad! Blimey! It went up straight, me hearties, t' chute deployed at apogee and it came down gently. Begad! This time I tried it without any dog barf and t' baffles worked fine.

T' third flight was on a C6-5. Ahoy! This too be a good flight and recovery. Ya scallywag! Ya scallywag! It had a bit o' weathercockin' but landed near t' pad.

semroc_centurion_recoveryphaseRecovery:
This rocket should nay be flown on an A motor... period. Aye aye! I should have been able t' figure that out for myself. Well, blow me down! That bein' said, arrr, arrr, it does well on a B and very well on a C. Avast! T' baffle works great and t' rocket looks good... Avast! if you get the fins on right. I didn't, shiver me timbers, but it still flew well. Arrr!

PROs: good launch, easy prep
CONs: A8-3 does nay belong on t' motor list. Begad!

Flight Rating: 4 out o' 5

Summary:
This is a nice rocket. Avast, me hearties, me proud beauty! Blimey! It looks good and is easy t' build. It is fairly forgivin' and fles great.

Overall Rating: 4 out o' 5

Other Reviews
  • Semroc Centurion By Ron Wirth (July 12, 2007)

    Brief: The Centurion is another nice addition in the Semroc Retro-Repro series of rockets. For being a 4FNC rocket, it has some cool extras, namely the dual chutes, ejection baffle and shape of the laser cut fins that lead me to purchasing this rocket. I really like the curved portion of the fin at the rear of the rocket. Construction: This kit comes with 2 sections of body ...

  • Semroc Centurion By Chan Stevens (June 7, 2007)

    Brief: The original Centurion was introduced in 1970 by Centuri and was one of the first rockets to introduce an ejection baffle system, eliminating the need for recovery wadding. This is good for long, slow flights, and a nice flier. Construction: The parts list: Balsa nose cone 2 ST-16 body tubes 4 Laser-cut balsa fins 18mm motor kit 2 12" plastic ...

  • Semroc Centurion By Bill Eichelberger (May 31, 2007)

    Brief: Originally a Centuri kit circa 1971-77, the Centurion was perfectly sized to fit in with the Estes Big Bertha and Semroc Vega. With 18mm power and an ejection baffle that all but eliminated the need for recovery wadding, the Centurion was another choice in the crowded field of skill level one birds that were perfect for flights from smaller fields. The Semroc version also ...

Flights

Comments:

avatar
H.C.M. (June 18, 2007)
A great kit, my review would agree with everything the reviewer wrote. Only one small problem from my end. The red stripe decals provided weren't quite long enough to go completely around the main body tube. It took some "piecing" together of two stripe decals. Not a big deal, but might be trouble for a younger modeler inexperienced with decals.

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