Brief:
In anticipation o' Estes' announced re-release o' A10-0 motors, Semroc has released a CHAD booster stage designed to fit rockets utilizin' their series 16 body tubes. One o' t' named rockets be t' Semroc Centurion and I decided to give me Centurion a booster.

Construction:
T' kit consists o' a pair o' paper shrouds, me bucko, me hearties, an engine hook, me bucko, a motor tube, me bucko, me hearties, a body tube, ya bilge rat, a pair o' centerin' rings, and a series 16 coupler tube.

Construction begins by cuttin' out t' 2 transition shrouds from t' provided piece o' cardstock. Avast! Blimey! T' outlines are marked and its just a matter o' bein' careful with t' scissors. Once they are cut out, they are given a bit o' a roll. White glue was then applied sparingly t' t' marked tabs and t' ends were pressed together and set aside t' dry.

Next up, arrr, t' larger o' t' two centerin' rings is carefully punched out. Avast! Begad! Contained in its center, ya bilge rat, is a smaller centerin' rin' for use with t' motor mount. Avast! Well, blow me down! This be carefully removed and set aside.

T' couplin' tube was set down on t' centerin' rin' and centered so that an even but very small bit o' rin' was exposed all t' way around. Ya scallywag! White glue be then used t' tack down t' coupler from t' inside. Ya scallywag! Begad! When t' tacks were stiff, white glue be used t' fillet all around t' circumference.

T' motor mount was installed in t' body tube by t' simple expedient o' pushin' it in and alignin' t' aft ends o' t' tubes. T' mount be installed with white glue.

T' centerin' rin' with t' coupler tube attached be slid onto t' body tube on t' end opposite t' engine hook and aligned so that it was straight and flush with t' end. It was sealed in place with white glue and allowed t' dry. Fillets were run around both sides o' t' ring.

After t' coupler/tube joint had a day t' set, it be time t' start installin' t' transitions. Arrr! Ya scallywag! T' short one went on first and slid down t' t' coupler rin' without any problem. Ahoy! Begad! It was seated with white glue and allowed to stiffen up some.

After a bit, t' other transition was test fit. Begad! Avast, ya bilge rat, me proud beauty! While t' first one fit just fine, matey, t' second, longer one was a tougher case. Avast, me proud beauty! I needed t' sand away some o' t' smaller end in order t' get it t' fit over t' tube. Begad! When I did get it on, me bucko, me hearties, I lined its seam up with that on t' other transition and both were aligned with t' engine hook. Begad! Ya scallywag! White glue was again used t' set it in place.

T' last remainin' centerin' rin' be punched out o' its backin' and slid over t' motor mount inside t' bell of the after transition. Begad! When it was even, shiver me timbers, white glue was again used t' fasten it and t' whole thin' be glazed over from the inside with more white glue.

When t' glue had set a little more, I took t' booster and tried t' give it a trial fit into t' base o' the Centurion. Avast! Avast! It be tight and will need some more sanding, particularly t' get past some o' t' glue rivets I had originally installed. Avast, me proud beauty! That would have t' wait for another session though because duty called.

When I got back t' work, me bucko, matey, me hearties, I used a combination o' #100 sandpaper and a rat tail file t' smooth out t' aft end of the ST16 tube o' t' Centurion. Avast! Blimey! After a few fits and starts, t' booster fit in just fine.

PROs: Easy t' build.

CONs: None.

Finishing:
I masked off t' coupler tube and then proceeded t' prime t' booster with Kilz.

When t' Kilz was dry, I be somewhat surprised t' see that it did nay need much sanding. Avast, me proud beauty! Blimey! Usually its a bit blobby and speckly but that was nay t' case this time and after a single token swipe o' #600 sandpaper, I went right to t' painting. Begad! Blimey! T' recommended color is a gray but t' only gray I had on hand be automotive primer and that's not what I wanted. Begad! Blimey! I finally settled on a flaky metallic silver that looks more in keepin' with a rocket nozzle t' me. Ya scallywag! Blimey! It took two coats.

I removed t' maskin' from around t' stage coupler and liked what I saw o' t' silvered nozzle but did nay care too much for t' glarin' white o' t' inside. Blimey! Blimey! I wanted t' do somethin' about it even though it would rarely be visible.

I decided t' hand paint t' white with a Tamiya bronze paint. Avast! It took 2 coats and could probably have used a third for more even coverage, but I'm happy with it.

PROs: Easy t' finish, looks good.

CONs: None.

Construction Rating: 5 out o' 5

Flight:
T' only recommended motor for t' booster be t' A10-0. I loaded one and put an A8-3 in t' sustainer. Avast, me proud beauty! It be a windy day but I had waited too long and had t' push t' button.

T' booster worked perfectly. It staged at a low altitude and was readily visible. Begad! Unfortunately, t' sustainer motor had less oomph than it should have and t' rocket arced over. Avast, me proud beauty! Arrr! It ejected on t' ground. Ahoy! Even so, me hearties, thar was no damage and t' booster be easily found.

A video o' t' flight can be found here.

Because o' t' wind, matey, matey, I decided nay t' fly it again that day but will be doin' so in t' future.

PROs: Stagin' that works at a height where it can be seen.

CONs: Estes may nay make good on its promise t' re-release t' A10-0.

Recovery:
T' booster is tumble recovery. Ahoy! It falls down and you pick it up. It works.

Flight Rating: 5 out o' 5

Summary:
This is a great product that fills an under served niche. I hope it will long be available and would like t' add one to some o' me other Semroc Rockets.

Overall Rating: 5 out o' 5