ORIGINAL: VeeAte
Do I glue the ring into the cowl then use screws to screw the cowl ring to the fuse?
If so whats the best way to make sure the cowl will sit straight etc?
Note: this is generic... the same technique I've used on many different arfs...
Temporarily install the engine into the plane w/o muffler or any other protrusions.
Put plastic over the firewall.
Place the cowl ring in place against the firewall.
Put four or six dabs of 30 minute epoxy on the edges of the cowl ring. DO NOT saturate it, you merely want the epoxy to hold it in place...
Slide the cowl into position.
Put on the thrust washer, spinner and prop.
Align the cowl to the spinner leaving enough clearance for spinners ( remember that some spinners are "deeper" so allow for this in case you upgrade later.. ).
Tape the cowl into the final position it should always sit once installed.
Look through the cooling holes and make sure the ring is in contact with the cowl and there is a bit of expoxy joining the two at, at least four points... if needed CAREFULLY drip or apply a bit more epoxy.
Let dry.
Remove the prop, spinner, cowl and engine.
Since you used only a little epoxy you can always break or cut it out in case of an error.
If everything is OK apply a bead of epoxy on the inside and outside of the cowl ring ( or rather in front and behind... ).
Let dry... done.
ORIGINAL: VeeAte
I was thinking of inserting the wooden ring into the cowl and lining everything up. Then put a couple of drops of CA onto where the cowl ring sits on the cowl.
Ca dries too quickly to make minute adjustments, use the technique above...
ORIGINAL: VeeAte
Or is the cowl ring there just so the cowl stays round when its screwed to the model?
It depends upon the plane...
Some planes actually have magnets in both the cowl ring and the firewall. These are also VERY easy to install yourself!
Recess the magnets into the firewall so they sit ALMOST flush with the firewall, leave them protruding about 1/32" from the firewall... round magnets work best...
Place INK on the magnets.
Slide the now dry cowl ring in place and press.
Drill ( I dremel ) holes for the opposite magnets into the ring where the ink made a mark.
Recess & glue the magnets in the ring again letting them protrude about 1/32" from the ring... get the POLARITIES RIGHT!!!
You'll never need to use screws, particularly if you use at least four pairs of magnets...
To remove the cowl, merely remove the prop, and pull it off!
Simple!