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  1. How do you balance a delta? I’m building a Dyke Delta. CG is on the plans, but how do I double check?

  2. One issue that has created some confusion with respect to the MAC is weather or not the ailerons are included in the chord length for calculating purposes. Can you clarify this for us. Thanks

  3. This article covers all the basics of achieving correct longitudinal balance, but doesn’t cover lateral balance.

    The book mentioned, written by Andy Lennon, is valuable to those trying to get a better understanding model airplane aerodynamics and design. It’s heavy reading/deep stuff, but worth the effort. This book has helped me find and correct “hidden” design and building flaws in both BIY and ARF models. Models that crashed on takeoff or were unstable in flight became easy flyers.

  4. Excellent discussion on what many modelers (and full scale pilots) view as black magic and voodoo thus have aircraft that don’t perform as well as they could. At one time, I flew a Falcon business jet for a chief pilot who insisted a tail heavy aircraft was preferred since ‘all the old air race pilots’ did it that way to increase speed. I don’t know if that’s true or not but it seems a ‘lifting’ tailplane causes additional drag, I would have thought a perfectly balanced aircraft would be most efficient. As usual, no simple answers. For example, many of the bizjets I’ve flown have a 2-3 degree nose up attitude in steady, level flight. Does this equate to an increased angle of attack with an increase in drag? In this case, would a lifting tail reduce the AoA with an overall reduction in drag? Most acro models fly with a positive AoA due to symmetrical airfoils and I wonder again if the perfectly balanced aircraft is the answer.

  5. Does it matter if the plane is right side up or upside down when using a balancer as shown in the picture.

  6. I agree with the comment on downthrust as regards to an aerobatic plane platform. However, high wing aircraft, especially one with a flat bottom airfoil will need downthrust to counter pitchup when power is added.

  7. Wow! What a comprehensive article. Detailed and complete, yet easy to follow. Love the diagrams. Helpful in setting up completed completed flying model and great for scratch-building.

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