Model Airplane News - - FLIGHT TEST -

Cen­ter-of-grav­ity lo­ca­tion, con­trol-sur­face throws, rate setup, and more good info is typ­i­cally found in the man­ual, so I gen­er­ally rely on it. The rec­om­mended set­tings are great for start­ing points, but if you’ve ever won­dered why some pilots’ planes seem to fly so much bet­ter than oth­ers—even when em­ploy­ing the same air­frame—it could be the mix­ture of things. The Mul­ti­plex 330SC in­struc­tions pro­vide some mix val­ues, and when used, they pro­vide pilots with that ex­tra as­sis­tance.

Mix #1. Rud­der/El­e­va­tor

So you roll to knife-edge and are thumb­ing away won­der­ing, “Why am I fight­ing to keep it here?” To answer the ques­tion, first iden­tify what is hap­pen­ing: Is the plane pulling to­ward the land­ing gear or canopy? If there is a ten­dency to pull to­ward one side or the other, the method of mix­ing some op­po­site el­e­va­tor in­put to coun­ter­act this flight con­di­tion will lighten your thumb load. Pulls to canopy?: Cre­ate a mix so that, when you in­put rud­der, the el­e­va­tor will au­to­mat­i­cally move down, com­pen­sat­ing for you. Pulls to gear?: Cre­ate the mix to add up-el­e­va­tor. The per­cent­age you add is key and can best be found through ex­per­i­men­ta­tion. Start with a low per­cent­age— maybe 3 to 5%—and ad­just as needed.

Mix #2. Rud­der/Aileron

Your test flights revealed some ad­verse roll dur­ing the knife-edge con­di­tion; by mix­ing some op­po­site aileron in­put when rud­der is ap­plied, pilots can de­crease even more thumb load. Again, test and retest with dif­fer­ent val­ues (per­cent­ages) and find what works best for you. When you get it nailed down, your knife-edge flight should al­most be doable one-handed.

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