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FG Cowl Fabrication

Old 10-09-2019, 05:43 AM
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Default FG Cowl Fabrication

Hi All,

I hope this is the right place to ask this.

I am installing a radial engine in a large model, the engine diameter is slightly too large for the cowl, and I have to either make small holes for the rockers to poke out of, or find some other way of doing it. I was thinking of cutting the cowl in 3 or 4 places and just 'widening' it by a mm or so at each cut. I am wondering if this makes sense, and if anyone has any advice on how this can be accomplished or a similar plan, please say so.

I understand that the cowl will be slightly bigger, but I may cut cowl flaps so that it doesnt look as bad, and would allow more cooling.

Thanks in advance.
Old 10-09-2019, 01:36 PM
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Have you thought about blisters on the cowling?
Old 10-09-2019, 02:45 PM
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I have not done as you are considering, but have seen it done on some number of internet builds.
Old 10-09-2019, 11:37 PM
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Dan, yes, that was an option, but a part of me says that a 'slightly' enlarged cowl might look less unsightly than blisters. Not only that, but given the tolerances, it may be difficult to install/remove the cowl with rockers having to squeeze through little holes etc. I like cowl installs to be done so that they are easily removable for maintenance works. I also dislike adding wieght to cowls as I often test fly planes without them.

R8893, if you ever come across one that you can think if, please let me know with a linkety link...

Old 10-14-2019, 07:09 AM
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If you go with the split cowl, I’d suggest you make a couple rings to fit inside with a few stringers to keep then aligned. We call it a buck in the fab shop. This will help keep the pieces aligned and make glassing them back together much easier.

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