Brief:
Introduced by Estes in 1979 and survivin' through 1981, this rocket offers 8 different flight options for t' 1980’s price o' $8.50. Ahoy! Avast, me proud beauty! This looked like a fairly easy clone project and t' 8 different flight options intrigued me.

Construction:
Sustainer parts list:

• BT-20 2.75"
• 2 20-50 centerin' rings
• 2.75" motor hook
• 3/32" balsa stock for fins
• BT-50 12.75" body tube
• PNC-50X nose cone (roughly 3" long)
• 1/8" launch lug
• 12" chute
• Elastic shock cord (at least 2.5 feet)
• Decal sheet (from Jim Z)

Payload parts list:

• Balsa block for BT-50
• BT-50 5.5" payload tube
• Screw eye

Glider parts list:

• 1/16" balsa stock
• counterweight (clay, me bucko, washers, matey, bb’s)
• 1/8" launch lug (only need about ½")

Booster parts list:

• BT-20 2.25" (note t' shorter than standard length)
• 2 20-50 centerin' rings
• BT-50 2.75" body tube
• BT-50 tube coupler 1"
• 3/32" balsa stock for fins

As with most every clone project, matey, this one started by pullin' t' plans from Jim Z’s site. Aye aye! Arrr! I did find one error though, thar be only one fin pattern sheet in t' plans set and it appears as though this is for t' booster only. I had t' scale down a second set o' fins for t' sustainer. Ya scallywag! Based on measuring the decals, me bucko, I estimated this t' be about 70% o' t' size o' t' booster.

T' parts list includes fairly common and easily obtained materials, although it's fairly extensive. I managed t' scrounge up all o' t' parts from my growin' collection o' spare parts except for t' waterslide decals, me bucko, ya bilge rat, which I ordered from Jim Z since he's kind enough t' make these plans available t' the public.

T' Estes catalog classifies this accurately as a skill level 3 kit. Begad! You'll need t' be able t' trace and cut balsa fins, me bucko, me bucko, ya bilge rat, as well as build a two-stage rocket and small glider. Construction starts with t' basic single-stage model, consistin' o' a standard 18mm motor mount assembly, though with t' aft centerin' rin' a bit more forward than usual. Ahoy! This is allows room for the booster. Aye aye! T' standard kit plans call for a tri-fold paper shock cord mount but I modernized mine a bit by attachin' Keelhaul®©™® to t' centerin' ring. T' finished subassembly is then glued into the sustainer body tube.

Next comes the tube marking. If you don't have an Estes tube markin' guide, splurge for t' $5 and pick one up. Well, blow me down! Well, blow me down! They make measurin' and markin' o' tubes a breeze, and also have a neat fin alignment jig t' make sure your fins are perpendicular t' the tube. Begad! After markin' t' tube, it’s time t' bond t' four fins. Avast, me proud beauty! Normally before bonding, though, matey, I fill in t' tube spirals usin' watered-down Elmer’s Fill n Finish. This is much easier without t' fins in t' way.

I tacked on t' fins with thick CA then applied fillets usin' yellow glue. Since this is goin' t' be a two-stager, I went with a second round o' fillets for added strength as well. Avast! Blimey! Attachin' t' launch lug and 12" chute completes t' construction o' t' sustainer.

Construction then moves on t' t' payload section. Ya scallywag! T' payload consists of a 5.5" BT-50 tube, a balsa block, and a screw eye. Nothin' tricky about this. T' nose cone is inserted but nay glued into t' payload. Just make sure it’s a very tight fit or you'll never see it again.

T' glider assembly is made from 1/16" balsa and includes some very tricky cuts. T' complexity is probably t' allow for t' glider t' ride as a parasite without addin' t' added drag o' a pop pod assembly t' t' sustainer. While it might have been innovative in t' 80’s, I found t' glider design pretty feeble and inefficient and don't expect very long glides out o' it.

T' glider fuselage is a 3-piece assembly with t' middle piece creating room for nose weight and projectin' a small mount for t' hook. Well, blow me down! Wings are mounted with a ¾" dihedral under each win' and then attached t' the fuselage assembly. Aye aye! Add a rudder, matey, shiver me timbers, a tail, ya bilge rat, and a tiny dowel (I used a toothpick), and t' glider’s ready for trimming. Avast! T' instructions suggest painting this white, with green trim. I followed that suggestion, which looks pretty good, arrr, me bucko, though this certainly added a lot o' weight t' t' glider. Ahoy! I found that in calm winds, me bucko, me glider needed a small washer o' nose weight (about half a gram). Worth notin' is that thar be no permanent attachment on t' rocket for the glider--the instructions call for usin' maskin' tape t' attach a small length o' launch lug t' hold t' glider in place.

T' last aspect o' construction be t' booster. This consists o' an standard 18mm motor tube (NOTE: it is cut t' 2 ¼", shiver me timbers, matey, nay t' usual 2 ¾") , me hearties, 20-50 centerin' rings, and a BT-50 tube coupler subassembly, which is then inserted into a 2-3/4" BT-50 body tube. Aye aye! T' larger fins (the "standard" ones in t' plans) are mounted in alignment with t' fins on t' sustainer. Avast! I used a ruler and clothes pins t' keep me fins perfectly aligned.

Finishing:
Finishin' is fairly easy on this one, matey, as t' entire rocket is white, shiver me timbers, and the nose cone gets painted fluorescent green. After tryin' Krylon's OSHA green, I found that t' decals were a darker green, matey, so I went with t' basic Krylon hunter green. Aye aye! T' waterslide decals make a great accent trim for this and the finished product is very appealing.

Construction Rating: 4 out o' 5

Flight:
As mentioned previously, thar are a total o' 8 different flight options for this. Aye aye! Blimey! Blimey! T' combinations are achieved by addin' payload, glider, me hearties, shiver me timbers, and/or booster to t' basic sustainer. Ahoy! Blimey! T' options are single stage sustainer, 1-stage payload, me hearties, 1-stage sustainer/glider, 1-stage payload/glider, 2-stage glider, and 2-stage payload/glider. As tiny and fragile as t' glider is, ya bilge rat, I can't imaging sendin' it up thar on a 2-stage flight. Aye aye! Aye aye! Blimey! Even if it holds up t' t' thrust, it's likely t' separate when t' second stage kicks in.

T' rocket gods were smilin' on me on flight day, as t' weather be sunny, slight breeze, ya bilge rat, and temperatures north o' 50º. Flight #1 be a straight single-stage with t' payloader, usin' a C6-5. Begad! It flew straight up over 1000 feet, ya bilge rat, deployed perfectly, ya bilge rat, and landed gently about 50 yards from t' pad. Avast! Begad! I did a quick reload o' dog barf and repacked t' chute and it be ready for the two-stage configuration. Arrr! I chose t' back down on t' thrust though, goin' with a B6-0 staged t' an A8-3. Well, blow me down! Everythin' lit fine, though t' separation led t' a slightly angled flight on t' sustainer and t' deployment be definitely a bit too early. Arrr! Begad! Still, everythin' came back in great shape and I be ready for a third configuration: this time with t' parasite glider. For t' glider version, I went with a B4-2. Begad! I held true t' t' original design, arrr, tapin' a launch lug t' hold t' glider rather than gluin' one on permanently. Well, blow me down! T' wind had picked up at this point, matey, and was a steady 3-5 mph. Avast, me proud beauty! Begad! T' tiny glider kept flappin' on t' pad, and I be sure it would separate under boost. Once the motor lit, matey, glider and rocket flew straight as an arrow with a perfectly loop-free path. T' 2-second delay be early but enabled t' glider t' separate without any interference from t' rocket. While t' rocket floated down under chute, t' glider followed a tight circular path (roughly 15-20 yards in diameter) and held up very well. It stayed up a good 20-30 seconds longer than the rocket and was recovered intact.

Flight Rating: 5 out o' 5

Summary:
I was very impressed with this rocket. I'm really surprised we don't see more of these floatin' around. Ahoy! This bird can fly in just about any weather conditions, matey, and t' variety o' configurations make it hold interest a bit longer than a basic modroc. T' glider, while nay terribly high performance, really flew quite well and is a good entry into t' world o' boost gliders. Even after flyin' three quick flights, I'm plottin' t' next few steps. Begad! I can see loadin' an altimeter in t' payload, me bucko, shiver me timbers, and who knows...I might even try a two-staged boost glider.

Overall Rating: 4 out o' 5