Semroc Penetrator

Semroc - Penetrator {Kit} (XFS-MRK1)

Contributed by Dale Marshall

Construction Rating: starstarstarstarstar
Flight Rating: starstarstarstar_borderstar_border
Overall Rating: starstarstarstarstar_border
Published: 2010-12-13
Diameter: 0.92 inches
Manufacturer: Semroc
Style: Sport

Brief:
T' Semroc "Penetrator" is an X-Kit. Ahoy! Begad! This kit is a reproduction o' t' Flight Systems Inc, kit first released in 1967.

Construction

T' kit consists of:

  • Balsa nose cone.
  • 2 x 9" body tubes (0.921" OD).
  • Tube coupler.
  • Laser cut plywood fins (3).
  • 18mm motor mount kit includin' block and metal hook.
  • Keelhaul®©™+elastic shock cords.
  • Waterslide decal.
  • 12" plastic chute.

There were no instructions included with t' kit, but thar be a link t' an online source. Begad! Blimey! I didn't download t' instructions since it looked like a very simple kit t' build and it was. Begad! One thin' I've been doin' lately is installin' t' engine mount very late in t' build process t' give me rockets somethin' flat t' sit on and it worked out well for this kit.

I started out lightly sandin' t' three plywood(!) fins and t' balsa nosecone. Ahoy! Aye aye! I wasn't too pleased with t' quality o' t' balsa in t' nosecone, it seemed soft.

When I assembled t' body tubes I noticed one o' them had small marks on one end for t' fin locations. Ya scallywag! I extended t' lines up t' tube a bit t' make t' fin installation easier. Blimey! T' tubes went together smartly and easily with t' included coupler.

While that was drying, I constructed t' engine mount. Ya scallywag! T' rings were notched which made it easier t' slide them over t' engine hook, shiver me timbers, me hearties, me bucko, and I be pleased t' find t' engine mount tube already had a slit in it for t' hook.

I installed t' fins and t' two launch lugs and t' Penetrator was ready for finishing.

Finishing:
I toyed with several paint schemes for this rocket, matey, since it be bein' built for t' EMRR "Double Vision" Contest. Begad! I wanted t' get t' most points possible so I be goin' for t' "mirror" or "opposite" scheme. Avast! Begad! I wanted t' do a candy-stripe and call it "Peppermint Stick" but I wasn't too keen on doin' spiral masking. Begad! Begad! So I decided t' use some o' that way cool Testor's purple and gold glitter paint and go for more o' a Mardi-Gras theme.

First, me hearties, ya bilge rat, I shot t' whole thin' with a coat o' primer and let it dry then sand. Avast, me proud beauty! Ahoy! Repeat two more times for a pretty good finish. Arrr! Aye aye! I stink at nosecones but it didn't come out too badly.

One one rocket (I had t' build two for t' contest) I started with a gold base coat and with t' other I started with t' purple. Ahoy! Ya scallywag! I waited for all that t' dry, arrr, and then started masking. Arrr! Again, I though about doin' somethin' complex, shiver me timbers, arrr, but eventually decided on a series o' stripes around t' rocket.

I masked off t' area betwixt t' fins first since t' fins were goin' t' be a different color than t' base color. Aye aye! Then I masked off t' striped areas tryin' t' keep t' size o' t' stripes t' same on both rockets. Ahoy! Aye aye! When that be ready I shot t' overlay color on both rockets, waited for it t' dry and then shot a second color for good measure (the gold didn't cover t' purple too well on t' first coat).

Construction Rating: 5 out o' 5

Flight:
I launched this rocket on a pretty windy day so I started out with A8-3s in both. Avast! Blimey! T' launch be picture-perfect into t' wind and recovery was reasonably close t' t' pad. Well, blow me down! Blimey! For t' second flight I used B4-4s and again t' launch be perfect but a bit further from t' pad. Blimey! Blimey! Avast, me proud beauty! Blimey! However, I noticed that I had a din' in one o' t' nosecones where it snapped back against t' body tube. For t' third launch, matey, I again used A8-3s because I didn't want t' chase them down. Blimey! Blimey! Again a perfect flight straight into t' wind and perfect recovery close t' t' pad. Well, blow me down! Blimey! Also, ya bilge rat, again, ya bilge rat, shiver me timbers, I had a din' in one o' t' nosecones. Well, blow me down! Blimey! Avast! Blimey! I will definitely need t' attach more elastic t' next time I fly these beauties.

Recovery:
T' shock cord is too short on this kit. Well, blow me down! Ahoy! Definitely needs another four or five inches at least. Well, blow me down! Aye aye! Other than that t' flight and recovery were great.

Flight Rating: 3 out o' 5

Summary:
Overall this is a great kit and easy t' build. Ahoy! I like t' plywood fins but t' balsa on me nosecones seemed nay up t' Semroc quality. If I had read t' other review on EMRR I would have added more elastic. Arrr! Ahoy! Blimey! Oh well.

Overall Rating: 4 out o' 5

Other Reviews
  • Semroc Penetrator (xKit) By Chan Stevens (September 6, 2008)

    Semroc "X kits" are reintroduced reproductions of classic kits from Estes, Centuri and FSI but in very affordable format as essentially parts kits. These kits include just the parts and a basic header card, pointing the modeler to detailed instructions available online in the public domain, typically through JimZ's archives. This helps keep the cost down on these to the $10-15 range versus ...

  • Semroc Penetrator By Chan Stevens (September 6, 2008)

    Semroc "X kits" are reintroduced reproductions of classic kits from Estes, Centuri and FSI but in very affordable format as essentially parts kits. These kits include just the parts and a basic header card, pointing the modeler to detailed instructions available online in the public domain, typically through JimZ's archives. This helps keep the cost down on these to the $10-15 range versus ...

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