Brief:
_Space Twins_ is (are?) a nifty rocket that spawned a bunch o' imitators through t' years, rangin' from t' MPC Lunar Patrol t' Estes' own "A.R.V. Begad! Condor." It features a finless central core that is recovered by parachute, plus two "parasite" gliders that detach on ejection. Ahoy! T' _Space Twins_ plans were distributed by Estes Industries as part o' their "Free Plan" program. Arrr! 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. Begad! T' booster-core is based on t' BT-20 body tube. Begad! Ya scallywag! It's basically a finless, matey, parachute-recovered model rocket. Arrr! Begad! It has two unusual features: A set o' "fenders" made from scraps o' balsa, arrr, and two pegs, for mountin' t' gliders, made from 1/8" dowels. T' dowels are glued into holes drilled in t' body tube; a tube coupler is glued into t' mountin' spot first, matey, t' reinforce t' dowel/body tube joint. T' gliders are lengths o' BT-5 tubing, with balsa nose cones and 1/16" balsa wings and rudders. Avast! 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. Aye aye! While t' plans specify balsa cones and lead weights, shiver me timbers, shiver me timbers, you should have no trouble usin' plastic cones and clay nose weight.

T' gliders and boosters went together fairly easily. Begad! Well, shiver me timbers, blow me down! T' instructions are fairly dense, shiver me timbers, and might be a little dauntin' t' those unfamiliar with early rocket construction techniques. Well, blow me down! As with many from-plan kits, buildin' t' Space Twins requires you t' cut t' fins and other parts from balsa sheets, shiver me timbers, usin' templates cut from t' plans. In order t' produce sturdier templates, matey, I reprinted t' plans on t' heaviest cardstock that me printer would accept. Avast! There were two tricky bits: Mountin' t' dowels into t' booster and insertin' t' launch lugs into t' gliders. Avast, me proud beauty! Well, blow me down! This requires cuttin' both lugs and dowels at fairly exact angles. Avast, me proud beauty! Be really patient, me hearties, "measure twice, cut once," and test fit t' parts first. Ya scallywag! Arrr! If you do things right, me hearties, shiver me timbers, shiver me timbers, t' gliders should slip onto t' dowels easily, and stay on and straight until t' model is turned upside down and "rapped" in t' rear. Avast! 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, me hearties, etc. Aye aye! Blimey! I decided t' use dope t' finish me _Space Twins_. Ya scallywag! Blimey! Dope is hard t' work with, and requires a very carefully sanded and filled surface, shiver me timbers, but when done well results in a nice, shiver me timbers, slick, durable finish. Ya scallywag! Blimey! Arrr! Blimey! I used balsa fillercoat on both gliders and core, and did lots o' sandin' t' eliminate balsa grain and generally smooth things out. Ahoy! Blimey! At this time, t' finish isn't complete. T' core and gliders are overall white, me hearties, me hearties, with t' underside o' t' glider wings painted black. Well, blow me down! Blimey! Aye aye! Blimey! I hope t' paint each glider with a unique, shiver me timbers, shiver me timbers, 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! Blimey! I decided t' test fly it with Quest A6-4 motor, me hearties, then follow up with a B4-4 motor. Ahoy! Blimey! Arrr! Blimey! 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! Arrr! Blimey! Flight prep is really easy. Aye aye! Blimey! T' booster is prepped just like a normal rocket. Begad! Blimey! I placed t' gliders on t' core after I'd slid it onto t' launch rod and hooked up t' igniter. Begad! Blimey! T' _Space Twins_ flew GREAT. Begad! Blimey! T' boost was very straight. Aye aye! Blimey! 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, me bucko, t' booster core's parachute didn't unfurl fully. Blimey! However, it was light enough that it landed without damage. Arrr! I think a streamer would do as well as a parachute. Well, blow me down! Blimey! T' glider "twins" separated cleanly and began circlin' downward in a fast, shiver me timbers, spiral trajectory. T' crowd seemed t' enjoy t' "show" they put on. Ya scallywag! They landed within about about five feet o' each other, arrr, 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. Ya scallywag! T' second flight, with an A8-5, was very similar t' t' first, although t' booster parachute deployed fine this time. Arrr! Once more, t' gliders separated cleanly, flew well, and landed close t' each other. Begad! I tried a B4-4 next. Ya scallywag! Well, blow me down! It flew a lot higher, and t' gliders had a lot more time t' swoop around. Avast, me proud beauty! But, as before, arrr, t' gliders landed quite close t' each other. I really liked that!

Overall Rating: 4 out o' 5