Ron Harrison Posted January 14, 2011 Share Posted January 14, 2011 I am fast approaching the need to start Cutting the GRP Cowl to fit around the SC46 I propose using on my Acro Wot. Can someone point me in the right direction as to the best way to measure up the various points for cutting? Thanks, RonEdited By Ron Harrison on 14/01/2011 11:19:10 Quote Link to comment Share on other sites More sharing options...
Steve Hargreaves - Moderator Posted January 14, 2011 Share Posted January 14, 2011 Not an easy task Ron & one I rarely look forward to.....for what its worth this is what I do... Fit the engine to the mount & then sellotape a sheet of clear plastic to the fuselage that can be folded over the engine (i use those plastic A4 document wallets that are open down two sides....cut open the other two sides & you have two A4 sheets of clear plastic!!). Mark the cylinder head centre & diameter on the plastic sheet. Fold back the plastic sheet & remove the engine. Replace the cowl, fold the plastic sheet back over the surface of the cowl & mark through the plastic sheet (with a pin, drill whatever...or you could cut out the hole in the sheet if you prefer..) Cut the hole to the correct size using a drill, file, Demel...whatever you have Repeat above for silencer/NVA/whatever else needs to stick out. Golden Rules.....1) Measure Twice Cut Once. 2) take small amounts off & check the fit frequently (its easy to take more off but very hard to put it back again!!!) 3) (Personal one this) Make sure you can reove the cowl without disturbing the engine silencer. Frequently taking the silencer off & replacing it will weaken the aluminium & lead to a stripped thread.....experience shows this will happen on a Saturday night before a perfect flying Sunday. Besides you don't need to take the exhaust off to remove the cowl on yer Cessna do you?? Just my 2p worth...hope it helps!!! Quote Link to comment Share on other sites More sharing options...
Bert Posted January 14, 2011 Share Posted January 14, 2011 Ron Gerard Feeney did a really good article on this sublect in RCM&E some years' ago.maybe David would know what edition it was in. Bert Quote Link to comment Share on other sites More sharing options...
ken anderson. Posted January 14, 2011 Share Posted January 14, 2011 ron-i roughly cut a enough out to get the cowl over the cylynder head...by making a series of small hole's drilled around the marked out hole...and then enlarge it as reqd...bit by bit.......check out mine in my photo album..you'll see the finished job...... ken anderson ne...1. Quote Link to comment Share on other sites More sharing options...
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