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. 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, shiver me timbers, but thar be a link t' an online source. I didn't download t' instructions since it looked like a very simple kit t' build and it was. Aye aye! 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. Aye aye! I wasn't too pleased with t' quality o' t' balsa in t' nosecone, matey, it seemed soft.

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

While that be drying, shiver me timbers, I constructed t' engine mount. Well, blow me down! Begad! T' rings were notched which made it easier t' slide them over t' engine hook, and I was 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 be ready for finishing.

Finishing:
I toyed with several paint schemes for this rocket, since it be bein' built for t' EMRR "Double Vision" Contest. Arrr! I wanted t' get t' most points possible so I was goin' for t' "mirror" or "opposite" scheme. Well, blow me down! I wanted t' do a candy-stripe and call it "Peppermint Stick" but I wasn't too keen on doin' spiral masking. Well, me bucko, blow me down! 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, I shot t' whole thin' with a coat o' primer and let it dry then sand. Repeat two more times for a pretty good finish. Avast, me proud beauty! Ya scallywag! 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. I waited for all that t' dry, and then started masking. Arrr! Again, I though about doin' somethin' complex, shiver me timbers, shiver me timbers, me bucko, 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. Ahoy! Then I masked off t' striped areas tryin' t' keep t' size o' t' stripes t' same on both rockets. Blimey! Avast, me proud beauty! 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. Begad! Begad! T' launch be picture-perfect into t' wind and recovery be reasonably close t' t' pad. Begad! For t' second flight I used B4-4s and again t' launch was perfect but a bit further from t' pad. However, shiver me timbers, I noticed that I had a din' in one o' t' nosecones where it snapped back against t' body tube. Aye aye! For t' third launch, me hearties, I again used A8-3s because I didn't want t' chase them down. Ahoy! Aye aye! Again a perfect flight straight into t' wind and perfect recovery close t' t' pad. Also, again, arrr, I had a din' in one o' t' nosecones. 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. Arrr! Blimey! Definitely needs another four or five inches at least. Well, blow me down! Blimey! 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. Aye aye! I like t' plywood fins but t' balsa on me nosecones seemed nay up t' Semroc quality. Aye aye! If I had read t' other review on EMRR I would have added more elastic. Avast, me proud beauty! 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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