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Corvus 540 70e

Old 06-21-2016, 03:17 PM
  #1  
Mad Thunder Bomber
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Corvus 540 70e Ive just maidened my 59" Corvus and love this thing! Im not a true 3d flyer but am very comfortable with aerobatic flying. At 1/2 throttle she needs some up elevator to stay level---is this normal or should a midwing plane fly level with neutral trims? I can move the battery back to offset this or trim the elevator. I have the CG where Im comfortable stalling the plane and getting into hi Alpha maneuvers so I really dont want to change the CG. Im torn between moving the CG vs. trimming the elevator. I realize trimming the elevator up 3 clicks will not help me while inverted.
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Old 06-21-2016, 04:14 PM
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JetPlaneFlyer
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Normal procedure for trimming an aerobatic model:

  1. Trim elevator for dead level hands off upright flight at roughly 1/2-3/4 throttle.
  2. Roll inverted - hands off and observe what the plane does:
  • If plane dives sharply the battery needs to move back, repeat steps 1 and 2.
  • If plane climbs battery needs to move forward, repeat steps 1 and 2
  • If plane flies level or dives very slightly that's good (personal preference dictates*)
*FWIW I prefer that the plane dives just slightly in the inverted test but some 3D flyers prefer dead level.
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Old 06-21-2016, 11:53 PM
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Mad Thunder Bomber
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Thanks for your thoughts-------- I know adjusting the CG will play the bigger part in solving my problem-------------I neglected to say that I have down right thrust angle also! Its come to my attention that midwing planes with symetrical airfoil wings dont need any thrust angle, which makes sense. I would rather be a tad nose heavy than a hair tail heavy.
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Old 06-22-2016, 12:03 PM
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JetPlaneFlyer
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Correct, it should have some right thrust (2-3 degrees) but for this type of plane usually you don't use any down thrust. I'd remove the down thrust before going any further.
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