ORIGINAL: Captain_YAK
Hi all! I did a scratch build job on a I-153 biplane and am having the following problems!
At take off the model will sway to the left (looking from behind) I have 4 degrees of right thrust and 2 down thrust. No mater what corrections I give it it will go in to a left banking turn and end up on its back or nose if I persist with the take off.
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Power source is a G-26 Used 16x8 prop up to 18x8 (smaller was better).
Top wing is a + 2 degrees bottom is 0.0 VS is -1.0
Did try to change the top to 0.0 but nothing did change.
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Kaptain_YAK.
Kaptain, here's what occurs to me.
1. The wing incidence, I believe, should be zero on the bottom wing, or perhaps positive a degree, and negative on the top wing, perhaps a degree. That way, the last surface to stall would be the top wing, rather than the first. After reaching flying speed, if you don't pitch the plane up too quickly, you should not stall as you continue to build speed. But you must hold off on pulling it off the ground, until flying speed is reached.
2. The pull to the left will go away when the tail lifts off. When the thrust line is level, the prop won't pull you to the left. So, you need a longer, more gradual buildup of speed, to keep that big prop from yanking you to the left. Then, lift off slowly, after building lots of speed.
Those are the things that jump out at me. Beautiful plane, I hope it flies soon!
Best wishes,
Dave Olson