Cowl cutting for motor - RCCanada - Canada Radio Controlled Hobby Forum
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Old 02-09-2015, 10:50 AM   #1
plane crazy
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Cowl cutting for motor

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Hello all,

Just finished assembling my GP Waco and used the recommended O.S. FS120 motor. This is my first ARF build using a Nitro motor and fiberglass cowl so I want to be extra careful in the measuring and cutting since you only get one shot at this.
Any advice on what kind of cutting tool to use with the dremel?
Any tips / advice on how you folks do this without causing more grey hairs?
All my freinds who fly gas/nitro typically don't fly with the cowl on as they are always adjusting things but this bird is to nice not to!
Thanks in advance for your suggestions.
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Old 02-09-2015, 11:09 AM   #2
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Re: Cowl cutting for motor

Nice aircraft, I agree.

I always mount the engine then I tape pieces of paper to the fuselage that extend past the engine. Make marks on the paper for exhaust, needles, some times the cylinders. Then fold the paper back and remove the engine. Install the cowl and fold the paper forward onto the cowl. Trace your lines to the cowl. I have a high speed rotary cutting bit to cut the rough size hole. I use the small sanding drums to finish the cut and smooth with paper by hand from the inside.

Take your time, it's worth it for sure.
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Old 02-09-2015, 01:04 PM   #3
plane crazy
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Re: Cowl cutting for motor

Thanks for the quick reply!
It makes sense now with how you've explained it, tonight I'll trace the engine outline and install the cowl. I'll post pics once installed.
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