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Dave's RV-7A Builder's Log
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Date: 1-19-2015
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Number of Hours: 5.00
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Manual Reference:
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Brief Description: Engine baffles
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A Monday off with temps forecast for around 70 degrees…in January…yes, it does happen, just not very often, so…out to the hangar early to continue work on the engine baffles. As mentioned in a previous post, the baffles are essentially an aluminum box that covers the cylinders and provides optimum airflow over the cylinder heads. Since every aircraft is slightly different, the baffles must be fabricated one step at a time to ensure the fit is as tight as possible.
The front part of the baffle system serves as a sort of “air ramp”, directing the flow of inlet air up and over the tops of the cylinders. In order to fabricate this, the lower cowling must be in place…but to get the lower cowling on, the baffles must be trimmed. It is this sort of “Catch 22” that makes building an airplane interesting. In the end, it wasn’t that difficult, but it did require that a sort of “cut by faith” first hack be made in order to get the cowling on. By eyeballing the ramps, it was pretty obvious that the outboard corners must be trimmed, so that’s what I did. After getting the cowling on, the trimming became much easier, as I had something to reference. There was quite a bit of the usual on/off/trim/on/off/trim work that has become commonplace, but progress was steady, and when I left the hangar, it was starting to look like it was supposed to.
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Bracket modified for oil line
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Left side fitting
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Inlet ramps starting to take shape
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