ORIGINAL: RegFlyer
Im putting together a VQ .42 Hawker Hurricane. I went to put the fuel tank in and found the pre-drilled hole in the firewall was drilled off set. (see pic) would it be ok if i cut the hole larger or could I risk messing up where engine mounts? The yellow hole is around where the fuel tank sits.
That's the thing I hate about ARF aircraft, but that's another topic that has been beaten to death before.
What I would do sailor is I would make my marks, make a templete of the original hole and trace it on a equal sized piece of ply. Cut out the tracing with a scroll saw or do it by hand until you can make the piece fit. Once you have a snug fit, epoxy it in place.
Once everything is fully cured, re-drill or Dremel the hole to size. I would drill the hole with a regular drill and then make the hole large enough so I can use the sanding drum bit on the Dremel- to finish making the hole.
When everything is done, sand everything smooth and re-paint or epoxy the firewall so it will be fuel proof. Making the hole larger you risk weakening the firewall. JMHO
I'm wondering by studying the picture that the design is for the engine to be mounted horizontally? I've seen ARF aircraft with funky firewalls like that and I suspect it was made like that so the cylinder of the engine won't protrude so much out the side of the fuse.
But if you want to change the angle of the engine, then I would do what I suggested to be safe.
If you think that firewall is funky, you should see the firewall on my Discontinued .60 Great Planes Fokker Dr1. Now that's Funky!
Pete