I'm just getting ready to deal with the cowl fitting. I didn't have the PVC or plastic bits on hand to make the EZ Cowl jig, and I didn't want to spend $400 on the super nice machined ones, so I decided to 3D print it instead. TBD if it works, but for less than $10 in filament, worth a shot. I did the math (hopefully) and made the jig the right depth to account for the 2 1/4" spacer (using a Sensenich GA prop), spinner backplate, 1/4" cowl gap, etc, so it should be the right size to set the cowl nose bowl in the right place. In hindsight, I should have printed some arms off of the sides to allow for clamping to the disc that attaches to the cowl. I'm just going to use a nice flat piece of plywood or MDF for the matching disc that is clecoed to the cowl. I was a little uncertain that just using a piece of scrap 1" dowel for the center locating pin would be stiff enough, but it's a snug fit and perfectly square - plenty strong to hold the cowl in place.
Happy to share the file if anyone wants it (FYI - the bolt holes are sized for 1/2" bolts, but I could make a 7/16" version easy enough if necessary). For thickness changes, you could easily just make up any differences you need by stacking wood on top of the printed part.
Happy to share the file if anyone wants it (FYI - the bolt holes are sized for 1/2" bolts, but I could make a 7/16" version easy enough if necessary). For thickness changes, you could easily just make up any differences you need by stacking wood on top of the printed part.
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