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Old 09-01-2017 | 06:21 PM
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onyta
 
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Smile Firewall Hole

Why is there a hole in most ARF"s. firewall ( 1" or larger) right in the middle,,,.I have a 30CC Yak, 25% Redwing SBACH, 35CC Escapade.
Ran the SBACH today looking for things to fix, bought 2nd hand, there is a mist of fuel on the inside of the windshield (canopy). Also there are 4 holes
in the bottom of fuse. Maybe to help cool the inside of fuse? Canister muffler-DLE30cc engine(motor). This plane is and always has been on gas not elec.
Can I patch, fill, or otherwise stop-up these holes. If not 'WHY' are they required???????
Also what is the formula or ratio for servo in.fp. tq. to sq.inches of control surface size.
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