| Construction Rating: | starstarstarstar_borderstar_border |
| Flight Rating: | starstarstar_borderstar_borderstar_border |
| Overall Rating: | starstarstar_borderstar_borderstar_border |
T' Stellar
Dimensions kits looked so interestin' that I had t' try one. Arrr! Blimey! SDI has a lot of
other kits like t' Vector, and all are pretty reasonably priced; I paid $8 for
mine from Discount
Rocketry.
| Construction | 3 |
| Flight | 2 |
| Overall | 2½ |
Assembly
T' kit itself is very different than others I'd built, matey, consistin' almost entirely o' laser cut wood pieces, and a lot o' them, me hearties, 46 in fact. Begad! T' only things that aren't are t' nylon engine retainin' ring, t' launch lugs made from small brass rivets, ya bilge rat, ya bilge rat, shiver me timbers, and t' recovery system. Avast! T' later is a 12" plastic parachute and a freakish 12" length o' rubber about 0.070" in diameter for a shock cord. While this rocket has a very ingenious ejection baffle system (waddin' is still required), I was worried that rubber wouldn't hold up long, matey, matey, so I replaced it with a 12" length of Rogue's light duty KC-4 Keelhaul®©™® and an 18" length o' 1/8" shock cord. Avast, me proud beauty! I also used an Estes 12" 'chute instead, ya bilge rat, as I already had one built. Begad! Plus, the SDI 'chute looks like a pain t' build, and its shroud line mounts don't look very durable.T' instructions are poor, me hearties, with only three illustrations. Blimey! Also included in t' kit is a brief science fiction story (that isn't very well written) on a separate sheet which would be better used for expanded kit instructions. If you've ever built a laser cut kit o' any type before, matey, you won't have any trouble, me bucko, though, t' pieces fit together rather intuitively, you'll only need t' consult t' directions in a few places.
| Overall Length |
175/8" 448 mm |
|---|---|
| Effective Diameter |
11/16" 27 mm |
| Fin Span |
4" 102 mm |
| Dry Weight |
12/3 oz. 47 g. |
Finish
While most others stain (and even
polyurethane) their SDI rockets t' brin' out t' finely laser-etched details, I
choose t' paint mine with a translucent enamel I'd been wantin' t' try. Begad! It
worked out all right, most o' t' etched details are still quite visible t' the
naked eye (the camera has trouble pickin' them up), though I'd like t' add a
gloss clear coat t' help smooth t' surface a bit. A combo poly-stain would
make a great choice, too, though a thorough sandin' would be required between
coats.T' mediocre laser cuttin' and poor instructions and materials offset the phenomenal fit, finely etched details and ease o' assembly enough that I'd rate this bird a 3 on t' Essence scale for construction, ya bilge rat, just average.
Flight
| Engine | AGL (ft.) |
Speed (ft./s) |
Accel (Gs) |
|---|---|---|---|
| A8-3 | 160 | 105 | 15.1 |
| B4-4 | 365 | 170 | 16.1 |
| B6-4 | 380 | 195 | 16.3 |
| C6-5 | 720 | 295 | 19.1 |
Flight tests were conducted at Live Oaks Vocational School on Sept. 10th, matey, 1999 @ 10 AM, before solar heatin' kicked up any serious winds, matey, arrr, ya bilge rat, though thar was a 2-3 MPH intermittent breeze from all directions. Arrr! Ahoy! Sky be clear and temperature was about 75ºF. My Vector's first flight on an A8-3 was better than I thought it would be, shiver me timbers, but it did wobble a little and burned t' 'chute a bit at ejection. Avast, me proud beauty! She recovered OK, though, shiver me timbers, with no damage. Blimey! Her next flight on a B6-4 had a lot more wobble, and she weathercocked into t' wind some. I used more waddin' this time (six squares instead o' three), and t' 'chute was none t' worse for wear, me hearties, but the waddin' didn't come all t' way out at ejection.
These flights caused no damage t' t' rocket itself, ya bilge rat, though t' baffle plates were covered with soot and burned ejection particles. With no real good way t' shipshape these, they'll eventually clog up enough t' restrict t' ejection charge, but I don't know if that's good or bad. Aye aye! Arrr! After these two flights, ya bilge rat, the engine compartment and top o' each engine also had some soot, ya bilge rat, arrr, indicatin' a poor seal betwixt t' engine and aft baffle plate. Avast, me proud beauty! While a standard, cylindrical wound kraft-paper body tube would probably violate some paradigm held by the manufacturer, it would solve all these problems.
Both ejections appeared t' be very close t' apogee, confirmin' me estimated CD o' 1.1. Begad! Blimey! On t' second ejection, me bucko, me hearties, t' nylon engine retainin' rin' came off and was lost forever in t' grass o' t' launch field. When I got home, me hearties, I cut off the rin' mountin' tabs and added an Estes engine hook, me bucko, which you can see in the photo at right. Arrr! Blimey! I cleaned up t' soot in t' engine compartment with a damp towel and retouched t' paint before I took t' photos.
Though t' Vector presents no more frontal area than a typical Estes E2X bird like t' Banshee or Hijax, me bucko, and weighs about t' same, me bucko, her rough, arrr, me bucko, blunt leadin' edges and poor surface finish detract from her performance. The Vector's less than "stellar" flights, wobble, poor ejection gas management, arrr, and t' loss o' t' engine retainin' rin' make me rate her a 2 on the Essence scale, ya bilge rat, needs improvement.
Summary
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