by Bill Gaylord » Wed Dec 14, 2016 12:33 am
The P40 cowl being a bit small has been discussed at length. Building any models, these are fits you have to plan and check ahead of time. Tape the firewall formers together and check the fit, then adjust from there, possibly notching in the stringer cuts a bit deeper. For some time I've been adding a second firewall with almost all of the center cut away so as to not add weight, that is undersized by the thickness of the cowling plastic. The precision flush fit looks much better than an overlap. There are numerous ways to key and secure the cowl, as well as gluing stop blocks to the inside of the cowl, so that the rubber motor doesn't stress the thin cowling edge. Another method is gluing a firewall inside the cowling, shaped to match the fuselage firewall, using dowel pins to key the cowling to the fuselage.
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