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Angier, the engine WILL sag and probably more than you think. We initially built ours so that the spinner was about 3/8 inch above the cowling. Over time, it sank down to where it was perfectly level...and kept sinking. After several hundred hours, we had to add a washer to the lower motor mounts to bring it back up. In addition to the sag, the engine moves around quite a bit, especially on startup and shutdown. I know what a perfectionist you are, but 0.175 inch sounds pretty close to me. Sure would lood good at the fly-ins but any contact would ruin it all.
Bill Harrelson
N5ZQ 320 1,150 hrs
N6ZQ IV 5.3769%
Ladies and gentlemen,
I have set the gap between spinner and cowl to approximately .175" all around. I'd like to close in this gap a bit with an additional 1BID on the face of the cowl. So, in everyone's opinion, how small a gap would be too small and result in eventual contact due to engine sag?
Angier Ames
N4ZQ
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