Modular rockeTs Building Baffles - National Association of Rocketry

Medi/Maxi-Magg Concentric 3-Chamber Baffle/Zipperless Bulkhead1/4" Bulkheadrecessed 1/16"GAS28" MMT-1.52 (38mm) 10" inside baffleForwardCenteringRing10" BT-3.00 Body Tube (Middle Chamber)11" TC-5.38 Coupler + STC-5.38 Stiffener (Outer Chamber)Body Tube (24" from Minie-Magg)5.5" (1/2 length) of Coupler exposed5/16" Eye Bolt,Nut, 2 FenderWashers12 DrillHoles5/16" dia.this with three coats of 30-minute epoxyon the inside of the cone. See Photo 12.The three sections of the Maxi-Maggare shown in Photo 13. The nose cone isattached to the 20" recovery section withsix screws (you can see the small holes forthe screws in Photo 13). With this recoverysection/nose cone slipped onto the baffle/BORN AGAIN ROCKETSFOR BORN AGAIN ROCKETEERSMEGA-Sized Replicas of Many Original Rocketry ClassicsUp-Scaled 1.7 to 4.8 the Original Size (Kit dependent)A Set of Original Up-Scaled Water Slide DecalsUses 24mm Single and Reloadable EnginesEasy to Follow Step-by-Step InstructionsAuthentic Landing Gear & Nose ConesPrecision Laser Cut Fins & PartsBULLPUPVIPERMore Models onour WebsiteVEGAPhoto 12. The short 5.38" nosecone with a 3/8" x 4.0" eye boltepoxied into the base molding end.Outside are a regular washer and nut,and inside is a large fender washerand nut heavily epoxied in place.Not the opening cut in the shoulderto allow working on the internal parts.coupler of the rocket, it is the Medi-Maggconfiguration with a length of 57". The additional20" payload section (with its bulkheadin place with another 5/16" stainlesssteel eye bolt) can be added to lengthen therocket into the 77" Maxi-Magg configuration.The payload section also needed sixmatching holes in its coupler for the reten-tion screws to attach it to the top of the recoverysection, and six more holes for thescrews that attach the nose cone to the topof the payload section.To finish off the rocket, I first re-filletedthe fin/dowel/body joint, put motor retaininghardware on the rear centering ring,epoxied all joints inside the rear fin cage,epoxied the rear centering ring in place,and placed three rail buttons on the fincan and a fourth rail button on the payloadsection. And, of course, I still need to finishpainting the Medi/Maxi-Magg.The recovery system consists of 25 feetof 9/16" tubular nylon, two 1/4" quicklinks, a 9.0 HPR swivel at the point onethird of the length from the fin can, and aTop Flight nylon parachute in the range of50" to 58". Note that steel 1/4" links havea S.W.L. of 880 pounds, whereas the stainlesssteel versions of the links are rated at1760 pounds.My calculations indicate that the Medi-Magg requires an ejection charge of 3 to 4NIKE-XSNOOPERSTILETTOLaser Cut Tube NotchesRobust Interlocking Engine MountPremium Recovery System IncludedAssembly & Sanding Jigs (Some kits)Industry’s Best Customer ServiceANDROMEDA(518) 827-3107info@qmodeling.comQMODELINGwww.qmodeling.com34 MAY/JUNE 2010 Sport Rocketry