The BerthaVostok

Designed and built by Steve Kristal
(Lets just say greater than 25 years o' buildin' rockets.)

Design :

T' design concept for t' BerthaVostok originated with an invitation t' my local NARRRRR branch's Bertha Bash night, arrr, arrr, where t' goal be t' kit-bash something original from a standard Estes Big Bertha kit. Blimey!

Havin' seen Gordon Agnello's Gemini Bertha and his brother's Redstone Bertha, I decided t' take retro-Bertha even a little further back with a Vostok version. Avast, me proud beauty!

T' design began with a standard Estes Big Bertha, and all t' original kit parts were used except t' shock cord which I replaced with Keelhaul®©™ and a shorter launch lug. Arrr!

T' Vostok part o' t' build be modeled after Peter Always's "Simplified Vostok". (see http://yellowjacketsystems.com/alway/plans.htm#Vostok ). Arrr! Blimey!

I upscaled t' design t' a BT-60 and instead o' usin' Peter's actual templates, shiver me timbers, I made me own usin' t' graphics from a free paper model by Lars Folman downloaded from t' web (see: http://hjem.get2net.dk/). Ahoy!

T' body tube graphics were resized from t' paper model as well and printed onto full-size label paper which I used as a body wrap. Aye aye!

T' hardest part be sizin' and makin' t' transition sections. Ahoy! Blimey! Blimey! Blimey! Their length was based on t' space "left over" betwixt t' lower portion o' the upper body wrap and t' upper cone o' t' strap-ons. Begad! Blimey! Blimey! Blimey! I significantly compressed the graphics on t' upper body wrap t' leave enough room for t' transition. T' overall effect is definitely Vostok-like, me bucko, but both t' upper graphics and the transition are way shorter than either scale or Peter Always's version. Well, blow me down! Blimey!

As for stability planning, arrr, thar was no way I could RockSim this. Instead I simply assumed that addin' those big honkin' Bertha fins t' an already stable Peter Alway design wouldn't cause any problems. Aye aye! Ya scallywag! I was right.

As for power, me bucko, additional weight be negligable with t' four strap-ons and transition made from paper. Blimey! My only concern was all t' added drag, but I figured t' basic Bertha has plenty o' power on a C6.

Construction:

Construction began with t' standard Bertha build up t' t' point of attachin' t' fins. Blimey! Upper body wrap was then applied. Avast, arrr, me proud beauty! Next, ya bilge rat, t' upper transition section, me hearties, with a paper centerin' ring, arrr, ya bilge rat, was slid up over t' bottom of the tube t' meet t' upper body wrap. T' lower body wrap be then applied, and the lower transition section slid up over that t' mate with t' upper section.

While I anticipated later puttin' on fins, and left cutouts on t' lower body wrap for their placement, me hearties, I should have also added placement lines for the strap-ons, matey, which I built and placed next. Avast! Well, blow me down! T' strap-ons were made from 100# card stock with t' graphics printed directly on. Their bottoms were "plugged" with card stock circles with appropriate graphics.

T' fins were covered with label paper graphics. Begad! T' fin edges were left flat, arrr, and then blackened with permanent marker. T' fins were then placed in t' cutouts left on t' lower body tube graphic, and filleted with white glue.

Because o' t' width o' t' transition, ya bilge rat, t' launch lug was applied t' a cut out on one o' t' fins. Avast, me proud beauty! Blimey!

T' only paintin' was t' nosecone, which be Soviet-era olive drab. Well, me hearties, blow me down!

Overall, arrr, ya bilge rat, t' build be fun, but if I did it again I would place t' fins first, and then t' strap-ons. Ya scallywag! Both would be a lot straighter if I had done it that way. But, arrr, arrr, on t' other hand, t' flights wouldn't be nearly as interesting.

Flight & Recovery:

Flight o' this rocket is surprisingly straight, considerin' t' lack of positionin' aids for both t' fins and strap-ons. Begad! It flies kind o' like a cross between a Bertha and a saucer as it tail wags it's way up. Blimey! Really fun t' watch and recovers easily on t' standard Bertha chute. Aye aye!

Hits about 400' on a C6 but did an end-over-end flip on a B6 (possibly a bad engine, ya bilge rat, and really cool t' watch, matey, but I won't try that again). Avast!

Conclusion:

Overall, me bucko, one o' t' stupidest rockets ever built. Begad! A marriage o' t' genius of Sergei Korolev and Vern Estes. Begad! Ya scallywag! Really, really fun t' build and fly, and lots of laughs from those who know and love rockets. Arrr! Ahoy!