Brief:
An approximately 1/120 sport scale model o' t' Soviet Proton-Zond, which sent an unmanned capsule around t' moon in 1968. Begad! I based it on a free paper model of t' Proton rocket available from Classic Paper Space Models (which now has a version o' t' Zond launcher available). It is a single stage, 18mm powered rocket, matey, and recovers with an 18" parachute.

Construction:
T' followin' parts were used:

• 2 BT-55 tubes, one 5.75" long and one 6.5" long
• 1 BT-20 tube 8" long
• 1 BT-50 tube 3.5" long
• 1 BT-50 tube cut down t' approximately 1 1/8" diameter and 1.75" long
• 6 BT-5 tube 4 13/16" long
• 1/8" basswood strips sanded t' half round for conduit (lots o' these)
• 3/16" balsa stock cut into 3/16" strips for conduit
• 1/8" balsa dowel 2.5" long
• 1/4" launch lug 1.5" long
• styrene sheet and tube
• engine hook, arrr, arrr, me bucko, launch lug, Keelhaul®©™® thread, me bucko, shock cord, 18" parachute
• Classic Paper Space Models Proton enlarged and printed on cardstock

I began with t' intention o' makin' a "quick and dirty" Proton-Zond usin' only parts I had at hand. Ya scallywag! Blimey! O' course, shiver me timbers, it became more complicated than I had planned. Still this is a fun, arrr, fairly straightforward build that results in a good lookin' sport scale model that flies quite nicely without fins. I used diagrams and dimensions I found on t' internet and a few drawings graciously sent t' me by another member o' T' Rocketry Forum. Begad! The main body consists o' t' BT-20 engine tube runnin' through t' two BT-55 sections, matey, matey, separated by a 13/16" gap for t' interstage truss. Ahoy! T' upper stages are made o' t' cut down BT-50 inside t' standard BT-50 with a custom drawn shroud t' connect with t' BT-50 at t' bottom. Avast, me proud beauty! Begad! This is where t' rocket separates for recovery, usin' a BT-55 coupler. Avast, me proud beauty! Another custom drawn shroud (through lots o' trial and error, mostly error, me hearties, shiver me timbers, ya bilge rat, was needed here) forms the payload shroud. At t' top, t' balsa dowel is glued inside t' 1/4" lug and centered in t' cut-down BT-50. Well, blow me down! T' nose cone is another custom drawn cardstock shroud. Arrr! T' paper model was used for t' strap-on nose cones, interstage trusswork, matey, engine nozzles and first stage detail. Begad! Aye aye! All t' cardstock sections were coated with thin CA for strength and sanded smooth.

I spent a lot o' time detailin' t' upper stages with plastic bits, shiver me timbers, tiny balsa nozzles for t' escape tower, and styrene and paper for t' stabilizing gratework that t' Soviets use on man-rated rockets.

Most o' the difficult work be in creatin' t' cardstock shrouds. Begad! Well, blow me down! T' conduit work was made with basswood strip sanded t' half-round and cut t' size. Avast, matey, me proud beauty! I also simulated the second stage engines seen through t' interstage trusswork usin' paper engine nozzles cut in half and glued t' t' BT-20 engine tube. Well, blow me down! Ya scallywag! T' interstage is made of paper carefully cut out with a sharp hobby cutlass. Avast, me proud beauty! Avast, me proud beauty! Just about all construction was done with yellow carpenters glue and t' plastic parts were attached with CA.

Finishing:
T' paint scheme is simple: aluminum for t' first stage center tube, white for most everythin' else. Begad! Black strips on t' bottoms o' t' strap-on tanks, arrr, silver for t' engines, stabilizin' grate frames, me bucko, and red escape engine nozzles and hatches.

Flight:
For recovery I ran Keelhaul®©™® thread from t' top o' t' BT-20 and attached a length o' shock cord. Blimey! After balancing, shiver me timbers, me hearties, I added 4 pennies inside t' nose section and poured in some 5 min epoxy. Avast! I stuck a length o' Keelhaul®©™® in t' epoxy for t' upper section recovery, me hearties, attached t' 18" chute to that and connected that t' t' main section. Ahoy! T' model balances about 1" forward o' t' interstage trusswork and weighs in at 2.8 oz.

I was fairly certain stability would nay be an issue with t' strap-on tubes and nose weight. Ya scallywag! A swin' test showed no wobble. Aye aye!

After a long snowy winter and rain soaked February, I waited a long time to launch this one! After a dry spell, arrr, ya bilge rat, I went out with a few motors and set up the first flight on a B6-4. Arrr! Flight be beautiful with no instability and a straight path t' about 300'. Ejection be just past apogee and descent be a little quicker than I would have liked but no damage even after hittin' t' ground on the paper engine nozzles. Another flight on a B6-4 be just as good. Ya scallywag! I think a C would be too much for this. Well, blow me down! It jumps off t' pad pretty smartly on a B.

Summary:
Although I spent more time than I had planned, me hearties, I am pleased with t' way it came out. Well, blow me down! I have always liked t' look o' Soviet boosters, and t' Proton complements t' Vostok nicely. Begad! Avast, ya bilge rat, me proud beauty! Blimey! T' upper stage has a lot o' interestin' detail, and t' finless design is sure t' catch t' eye. Because it is based on a paper model, ya bilge rat, it can be made in different sizes very easily by enlargin' t' drawings. If you are lookin' for somethin' a little simpler, thar are several flavors of Proton, many with less complicated payload sections.