Mul­ti­plex Ex­tra 330SC GB

Fly ex­treme 3D with this re­ceiver-ready model

Electric Flight - - CONTENTS - By Mike Gantt

Ger­not Bruck­mann is one of the most ex­pe­ri­enced guys out there at de­sign­ing and fly­ing suc­cess­ful 3D air­frames, and Mul­ti­plex teamed up with him to cre­ate this awe­some Ex­tra 330SC model, which is ac­tu­ally li­censed by Ex­tra Air­craft. Some of the most ex­cit­ing types of RC fly­ing, 3D ma­neu­vers de­mand that an air­frame be al­most in­de­struc­tible and able to with­stand high-g loads, and this new Ela­por air­frame de­liv­ers.


I tested the re­ceiver-ready ver­sion of this model, which comes with all hinges in­stalled ex­cept the rud­der. Hing­ing the rud­der re­quires that you sim­ply snap it to the ver­ti­cal sta­bi­lizer’s hinge halves. When the two make pos­i­tive con­tact, there will be a def­i­nite click. Mine fit to­gether flaw­lessly, and the re­sult is a smooth-op­er­at­ing con­trol sur­face that can be eas­ily re­moved if needed. The other hinges are wide, flat plas­tic CA types with four per aileron and four on the hor­i­zon­tal sta­bi­lizer/el­e­va­tor. The tug test ver­i­fied that all were glued in well at the fac­tory. Con­trol con­nec­tions are com­pleted with long servo arms, metal rods, and dou­ble plas­tic con­trol horns, all of which were fac­tory po­si­tioned, glued, and ready for fi­nal ad­just­ment. Setscrews make setup a breeze. With power on and all con­trols at neu­tral, you can quickly and eas­ily po­si­tion your sur­faces by hand and tighten up the screws. Adding a drop of blue thread-locker to the screws doesn’t hurt.

The land­ing gear looks su­per cool and is made out of car­bon fiber. It ar­rives as a com­plete unit with mat­ing un­der­car­riage fair­ings/cuffs, foam wheels, and plas­tic wheel pants all pre­assem­bled. Two larger-gauge hex-head fas­ten­ers an­chor it to the fuse­lage. For the tail gear, a bent wire and a foam tire keep the rud­der from drag­ging on terra firma. All air­frame parts fit to­gether with tight tol­er­ances. The wings are two parts, which are re­in­forced with more car­bon fiber. A car­bon-fiber-re­in­forced polymer wing tube keeps the wing halves lined up and from do­ing the “taco.” It’s prob­a­bly worth men­tion­ing that each aileron/coun­ter­bal­ance makes up more than a third of each wing! A sim­i­lar sta­bi­lizer tube is also em­ployed, while a plas­tic screw se­cures the hor­i­zon­tal tail in place. Rather than us­ing the supplied screw, I glued my sta­bi­lizer to the fuse­lage, as I have no in­ten­tions of dis­as­sem­bling this model.

The fuse­lage has a large hatch, held in place with magnets and a me­chan­i­cal latch. A tinted “glass” cock­pit shows off a pre­placed pi­lot bust and dash­board with flight in­stru­ments/gauges at the ready. The fac­tory-ap­plied de­cal de­sign is stun­ning; a big thanks goes out to the de­signer and ap­pli­ca­tor. For power (thrust for 3D), there is al­ready a mo­tor and speed con­trol in­stalled. Check the supplied pro­pel­ler for bal­ance, in­stall it, and screw on the supplied spin­ner. The sam­ple prop was well balanced out of the box.


Short grass is good, and a paved run­way is ideal. Hardly any room is needed; you could fly this plane in a park base­ball di­a­mond. De­pend­ing on your fly­ing style or frame of mind, this plane can do a scale take­off as smooth as silk or you can pull up and go into an “af­ter­burner”-type ver­ti­cal climbout. The thrust gen­er­ated by the Per­max power sys­tem pulls the plane up in a hurry, so hardly any rud­der cor­rec­tion is need dur­ing the roll­out. Landings are al­most as easy. Keep the prop turn­ing and wings level while us­ing

small el­e­va­tor in­puts to con­trol the speed and an­gle of at­tack. Har­rier landings are easy to do, but greasy three-point­ers look cool too. A short roll fol­lows touch­down and af­ter the speed bleeds off, plant­ing the tail­wheel down with full up-el­e­va­tor makes for easy taxi­ing back to the pits.


Sta­bil­ity: Air­craft de­signed for aer­o­bat­ics are not typ­i­cally de­signed to be sta­ble; in­sta­bil­ity is what al­lows us to do in­cred­i­ble aer­o­batic ma­neu­vers. That said, when flown in a nor­mal pat­tern, the plane feels fine and flies like a 3D ship should. Track­ing: The size of the model is de­ceiv­ing as it tracks better than pre­dicted. Per­haps the slightly elon­gated tail mo­ment and servo torque power aid this en­deavor. Aer­o­bat­ics: This is where the col­lab­o­ra­tion among one of the best pi­lots, best air­craft com­pa­nies, and best model man­u­fac­tur­ers re­ally shows it­self off. The roll rate spins like a drill, and the ri­fle rolls are blind­ing. Any ma­neu­ver is pos­si­ble—dream it and you can do it. Glide and stall per­for­mance: Fly­ing poststall in high al­pha is more proof of how well this plane is de­signed. The thick wingtip air­foil keeps wing rock at bay. Glides aren’t like a trainer, but they’re not too steep; the con­trols will re­tain their ef­fec­tive­ness, so just keep a lit­tle power on to ex­tend your slip.


There was some cou­pling in knife-edge, and the build­ing in­struc­tions give you good mix val­ues to start with. You should also know that the con­trol sur­faces are ex­tremely pow­er­ful even on low rates. There is an op­tion to in­crease the throws (out­lined in the man­ual) to a “pro­fes­sion­als-only” level and is how the es­ti­mated rate of three-plus rolls per sec­ond was achieved dur­ing the flight tests.

A push-pull rud­der sys­tem is em­ployed. The tail wheel works well mak­ing taxi­ing an easy task.

Ply­wood re­in­force­ments and Hitec metal gear ser­vos keep this plane solid in flight.

Car­bon-fiber land­ing gear of­fers solid ground han­dling.

Ger­not, is that you in there? The in­cluded pi­lot bust is ready for ac­tion.

Short and sim­ple, the link­ages are easy to set up and ad­just.

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