Brief:
_Space Twins_ is (are?) a nifty rocket that spawned a bunch o' imitators through t' years, arrr, rangin' from t' MPC Lunar Patrol t' Estes' own "A.R.V. Well, blow me down! Avast, me proud beauty! Condor." It features a finless central core that is recovered by parachute, plus two "parasite" gliders that detach on ejection. Avast, me proud beauty! Begad! T' _Space Twins_ plans were distributed by Estes Industries as part o' their "Free Plan" program. Avast, me proud beauty! Ya scallywag! T' plans may be found at: http://www.dars.org/jimz/eirp_41.htm.

Construction:
T' _Space Twins_ gliders and booster-core are made from very conventional materials. Blimey! Avast, me proud beauty! T' booster-core is based on t' BT-20 body tube. Begad! It's basically a finless, parachute-recovered model rocket. Well, blow me down! It has two unusual features: A set o' "fenders" made from scraps o' balsa, matey, shiver me timbers, and two pegs, ya bilge rat, for mountin' t' gliders, made from 1/8" dowels. Begad! Ya scallywag! T' dowels are glued into holes drilled in t' body tube; a tube coupler is glued into t' mountin' spot first, t' reinforce t' dowel/body tube joint. T' gliders are lengths o' BT-5 tubing, arrr, with balsa nose cones and 1/16" balsa wings and rudders. Short lengths o' 1/8" launch lug are mounted on t' "ventral" surface o' t' gliders, just t' t' aft o' t' nose cone; these fit over t' booster-core's dowels. Arrr! While t' plans specify balsa cones and lead weights, shiver me timbers, me bucko, you should have no trouble usin' plastic cones and clay nose weight.

T' gliders and boosters went together fairly easily. Blimey! T' instructions are fairly dense, and might be a little dauntin' t' those unfamiliar with early rocket construction techniques. Avast! As with many from-plan kits, ya bilge rat, buildin' t' Space Twins requires you t' cut t' fins and other parts from balsa sheets, ya bilge rat, usin' templates cut from t' plans. Arrr! Avast! In order t' produce sturdier templates, I reprinted t' plans on t' heaviest cardstock that me printer would accept. Begad! Begad! There were two tricky bits: Mountin' t' dowels into t' booster and insertin' t' launch lugs into t' gliders. Ya scallywag! Ya scallywag! This requires cuttin' both lugs and dowels at fairly exact angles. Avast! Be really patient, "measure twice, shiver me timbers, cut once," and test fit t' parts first. Ya scallywag! If you do things right, me bucko, t' gliders should slip onto t' dowels easily, me hearties, me bucko, and stay on and straight until t' model is turned upside down and "rapped" in t' rear. Begad! I test-flew t' gliders by tossin' them around me livin' room. They glided really well; I did have t' adjust t' elevons on one, shiver me timbers, t' get a less-steep glide; I accomplished this by holdin' t' joint over a incandescent light bulb until t' glue softened a bit.

Finishing:
T' _Space Twins_ plans don't include a standard paint scheme, decals, etc. Avast, me proud beauty! Ahoy! I decided t' use dope t' finish me _Space Twins_. Blimey! Dope is hard t' work with, ya bilge rat, and requires a very carefully sanded and filled surface, ya bilge rat, but when done well results in a nice, slick, me bucko, me hearties, durable finish. I used balsa fillercoat on both gliders and core, shiver me timbers, and did lots o' sandin' t' eliminate balsa grain and generally smooth things out. Well, blow me down! At this time, t' finish isn't complete. Avast, me proud beauty! T' core and gliders are overall white, matey, with t' underside o' t' glider wings painted black. Ahoy! I hope t' paint each glider with a unique, matey, bright color; t' booster core will be white with a black nose.

Construction Rating: 3 out o' 5

Flight:
T' _Space Twins_ plans don't have a suggested motor list. Avast, me proud beauty! Aye aye! I decided t' test fly it with Quest A6-4 motor, me hearties, ya bilge rat, then follow up with a B4-4 motor. Arrr! I decided that t' longer delay on these motors would result in ejection happenin' "on t' way down," givin' t' gliders a better chance o' bein' knocked free. Ahoy! Blimey! Flight prep is really easy. Blimey! Begad! T' booster is prepped just like a normal rocket. Avast! I placed t' gliders on t' core after I'd slid it onto t' launch rod and hooked up t' igniter. Ahoy! Avast! T' _Space Twins_ flew GREAT. Avast, me proud beauty! Ya scallywag! T' boost be very straight. Altitude reached was moderate (perhaps 200' on t' A6-4); t' model had arced over and was startin' t' "plummet" downwards when t' ejection charge went off.

Recovery:
On me initial flight, ya bilge rat, t' booster core's parachute didn't unfurl fully. Avast, me proud beauty! However, shiver me timbers, shiver me timbers, it was light enough that it landed without damage. Avast! Ya scallywag! I think a streamer would do as well as a parachute. T' glider "twins" separated cleanly and began circlin' downward in a fast, spiral trajectory. Ahoy! T' crowd seemed t' enjoy t' "show" they put on. Begad! They landed within about about five feet o' each other, about 50' from t' launch pad.

Flight Rating: 5 out o' 5

Summary:
I flew t' _Space Twins_ twice more on t' day o' its inaugural launch. Avast, me proud beauty! T' second flight, shiver me timbers, with an A8-5, was very similar t' t' first, although t' booster parachute deployed fine this time. Begad! Once more, arrr, t' gliders separated cleanly, arrr, flew well, and landed close t' each other. Begad! Aye aye! I tried a B4-4 next. Begad! Well, blow me down! It flew a lot higher, and t' gliders had a lot more time t' swoop around. But, me bucko, shiver me timbers, as before, t' gliders landed quite close t' each other. Begad! I really liked that!

Overall Rating: 4 out o' 5