Pemberton Technologies Space Ark Jr

Pemberton Technologies - Space Ark Jr {Kit}

Contributed by Geof Givens

Construction Rating: starstarstarstar_borderstar_border
Flight Rating: starstarstarstarstar_border
Overall Rating: starstarstarstar_borderstar_border
Manufacturer: Pemberton Technologies

pemberton_space-arkBrief:
T' Space Ark Jr. Ya scallywag! is a downscale o' Pemberton Technology's midpower rocket. Blimey! Ahoy! Layne Pemberton offers a lot o' really cool retro-futuristic designs. Arrr! Begad! He's also a nice guy whose instruction booklets are well known for their humorous off-beat writin' style. Begad!

Construction:
T' package arrived with all necessary parts in good condition, me hearties, matey, except that t' balsa nose cone had a couple small dings. Aye aye! Begad! After readin' a back-story about t' Ruskie commies, shiver me timbers, Martians, ya bilge rat, and gung-ho American heroes, it be time t' start the build.

First came insertion o' lead ballast in t' nose cone, and some general sandin' and filling. Arrr! T' fins are cut from stock balsa usin' paper fin patterns. Ahoy! Avast! I had some difficulty because t' instructions referred t' various fins with names like "wing" and "horizontal stabilizer", but t' patterns/figures had no labels identifying which be which. Blimey! Well, arrr, blow me down! By process o' elimination, I eventually figured it out.

To attach t' fins, alignment lines must be drawn on t' tailcone. Ya scallywag! This was a very tricky process. The installation be made more difficult by t' approach o' through-the-tail-cone fin installation. Avast, me proud beauty! It would have been much easier and surely sufficiently strong t' surface mount t' wings with an appropriate shape cut along t' root edges. Also, t' fin tabs weren't slanted, which was also a bit confusing.

T' extra-long Keelhaul®©™® shock cord was glued t' t' outside surface o' t' motor mount tube, shiver me timbers, and this assembly was pushed/glued in t' tail cone. Because t' cord lay against t' exterior o' t' motor tube, I found it impossible t' insert t' tube into the tail cone. I had t' cut a trough inside t' tail cone t' make room for t' cord. Avast! It was still a snug fit.

T' rest o' t' assembly, includin' t' remainin' fins, was straightforward with one exception. Well, blow me down! Aye aye! I was confused about how far back along t' airframe t' mount t' wings. Aye aye! Ya scallywag! I guesstimated it from t' picture and adjusted slightly further back for safety. Avast! I skipped t' fin-tip pods because these sorts o' things tend t' snap off so easily.

Finishing:
Finishin' be mostly straighforward. Blimey! I fill and sand before assembly, arrr, so all that remained be touchup and then painting. Begad! With this retro-futuristic design, me bucko, matey, metallic paint is a great way t' go, me bucko, so I chose silver. Arrr! Aye aye! T' only tricky part is gettin' t' spray into t' crevices above t' crossbar.

Construction Rating: 3 out o' 5

Flight:
My problems occurred durin' t' flight, matey, which be unstable. I be a bit rushed so I smartly looked at t' recommended motors (B6-2 through E18) and chose a B6-4 because it be what I had. Ya scallywag! Rather than wrap t' 18mm motor in duct tape (as recommended) for friction fittin' (the only option), me hearties, me bucko, I used a spend 24mm casin' as a motor adapter. This works well and should be lighter than a large quantity o' duct tape.

I failed t' notice two instruction points about flying. Aye aye! T' instructions clearly said t' strin' test t' rocket before flying. Ahoy! Avast! Also, in t' middle o' construction step three, ya bilge rat, away from t' sections on flight prep, launch, and recommended motors is a sentence that says that a 48in rod is required for B motors.

Clearly it is me fault for nay followin' t' instructions, shiver me timbers, arrr, but I have a couple comments. Begad! First, arrr, he strin' test recommendation is sensible, me bucko, shiver me timbers, but I think it is reasonable t' believe that any commercially marketed model kit would have the CG/CP relationship sufficiently above minimum safety margins that modest variations in construction techniques by various builders should nay cause problems for recommended motors. Avast, me proud beauty! Why flirt so close t' edge? Perhaps I placed the wings too far forward.

Second, I would suggest that t' comment about 48in rods be moved t' t' recommended motor section; it is easy to overlook in t' construction section. Begad! Actually, ya bilge rat, I would omit B motors from t' recommended list altogether since most LPR Estes motor fliers might nay have a 48in rod on hand and might nay understand t' importance o' t' extra rod length. Avast! I understand it, but I didn't notice t' advice.

Anyway, me hearties, t' rocket became unstable after leavin' t' rod, ya bilge rat, arrr, doin' t' typical "bumblebee" flight pattern. Upon crashing, t' aft portion o' t' rudder broke. Well, blow me down! Repair is possible.

Flight Rating: 4 out o' 5

Summary:
Because o' me experience, it is unfair t' judge flight performance for this rocket. Well, blow me down! Avast, me proud beauty! I have rated it on me expected performance, knowin' about PemTech's other kits. Begad! Well, shiver me timbers, blow me down! Quality o' parts was fine, arrr, construction was mostly straighforward with a few difficulties, matey, style was fantastic, and I expect that flight should be good.

Overall Rating: 3 out o' 5

Other Reviews
  • Pemberton Technologies Space Ark Jr By Todd Mullin (January 26, 2008)

    Brief: The Space Ark Jr. is a half-scale low power version of Pemberton Technologies' (Pem-Tech) mid power Space Ark. It is a single stage, parachute recovery model of the rocket seen in the sci-fi classic "When Worlds Collide". I got my Space Ark Jr. as a matched signed/numbered edition (#8) at the time Pem-Tech released their new low power line of products with their ...

Flights

Comments:

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P.T. (September 8, 2008)
Geof has given a very fair and accurate review of our Space Ark Jr. kit. I personally apologize for the kit being sold with the old Destruction Manual, which was reported to have all the deficiencies listed and supposed to have been replaced. The updated manual has: grain directions and names on the fin templates, mounting position of the wings and improved descriptions of steps. The suggestion about moving the comment concerning 48in rods to the recommended motor section will be implemented as well as a reevaluation of minimum motors. We would be glad to replace all parts broken during an unstable flight, free of charge. Please contact us at: ooppss@pembertontechnologies.com
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G.H.G. (September 9, 2008)
After reading my review, Layne immediately wrote to me, thanking me for my honesty and offering a replacement kit "out the door today". In my opinion, this shows excellent customer service and it is not the first time I have had such good service from Pemberton Tech. I didn't need another kit, but my experience with the Space Ark won't deter me from buying another PT kit in the future. Layne also mentioned that the instructions were updated at some point.
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M.A. (September 12, 2008)
I really enjoyed building this rocket! The instructions were funny and well presented. I was worried about the thru the tailcone fin mounting, but found it much easier than I expected. The fins are VERY strong with this method. I had no trouble attaching the Kevlar® shock cord to the motor tube on mine. I did install a 24mm motor block in mine and I flew it on a C11, it flew very nice and high. A D12 would really send this rocket into orbit. PemTech has a winner here.

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