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Old 08-19-2017, 10:17 AM
vfrazier's Avatar
vfrazier vfrazier is offline
Join Date: Jan 2007
Location: Mount Vernon, IN
Posts: 1,110

Blake has a nifty tool that is useful for installing the cowling. Rent or buy it here.

The tool mounts to the face of the crankshaft/flywheel on commonly used Lycoming and Continental engines. It has an adjustable disc that simulates the spinner position. The cowling can be clamped, or clecoed, to the disc while you trim, fit, drill it to the airframe, or other cowl half. This allows the cowling to be positioned very accurately and solidly while working on it.

You could even install the cowling before you buy your prop. Of course, you need to know the dimension from the flywheel face to the back of whatever spinner you plan to use. Planning and common sense required!

Anyway, it's a very handy tool that eliminates the need for you to cobble together a homemade tool, or actually work around an expensive prop/spinner.

Obviously, you need to have the engine hung to use this tool! Doh... I hate to have to point that out, but someone will ask!

YMMV, but many of you may find a tool like this very useful and time-saving.
Vince Frazier
F1 Rocket and F4 Raider components
RV and Rocket Accessories, Tailwheels, Tools, & More
1-888-8FLYBOY (1-888-835-9269)

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Old 09-21-2018, 01:45 AM
Gandalf Gandalf is offline
Join Date: Apr 2008
Location: Medford, OR
Posts: 279
Default Increasing Cowl To Spinner Clearance

After dry fitting my spinner, I appear to only have only about a 1/16 inch of clearance between the spinner bulkhead and cowl. On the other hand I have good clearance for the exhaust pipes and oil lines .

So I pulled the lower plugs and used cleco clamps to position the spinner on the bulkhead, centering the spinner.

After speaking to the folks at the mother ship, I purposefully "tried" to place the holes in the spinner bulkhead slightly forward of the midline to allow a little sanding of the bulkhead if needed. Most of the holes ended pretty much in the midline and at least none were aft of the midline. I also ordered the S-1210 spacer which moves the entire spinner assembly forward a tiny bit. Hopefully the combination of sanding the spinner bulkhead and installing the S-1210 spacer will give me the magic 1/8 inch clearance.

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Old 09-21-2018, 10:16 AM
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magiccarpet magiccarpet is offline
Join Date: Feb 2013
Location: Switzerland, Europe
Posts: 161

My clearance is 5/16" which to me seems just right and nice when comparing to other aircrafts. I aimed for a larger gap than stated in the KAI. I also installed the engine first prior cutting the cowl and never regret it.
Just my 2 cents
Chris, RV-12 HB-YSC
Phase I

=VAF= dues paid for 2018
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