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1/4 inch of ice on the V35 Bonanza weighs approximately 300-330 lbs. Kinda scary, huh?
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I once had 3/4-1" mixed on a light twin after getting into some inadvertent icing. This thing was covered... I mean, wings, tail, windscreen, props, etc. I don't even want to know what that weighed, though I remember the plane was maintaining level at about 5 degrees nose up at 'round 160 TAS. Scary. I'll never do that again.