DaleB
Well Known Member
I'm at the point where I am fitting the firewall to my -7. The build manual says to mark the center line of the bottom AL angle, center that in the second row of holes on the belly skin and drill two of the holes. Did that, it's all good, and I was careful to mark the exact center of the angle.
Next it says to make sure the firewall is 5/8" aft of the front edge of the forward skins. I can set the top of the firewall to 5/8" aft... but the BOTTOM of the firewall is 11/16" aft of the forward edge of the skins, exactly the same on both sides. So if I set 5/8" at the top edge, the firewall will have a slight downward tilt. Not much, maybe .15 deg or so. But I don't know if the firewall is supposed to be parallel with the front edge of the skin, or be 5/8" at the top and 11/16 at the bottom. I remember when building R/C models with my Dad, we'd have a little down and right thrust. This, however, is not balsa and pine.
My gut tells me make it parallel and set it to 11/16 at the top and the bottom. Anyone else run into this?
Next it says to make sure the firewall is 5/8" aft of the front edge of the forward skins. I can set the top of the firewall to 5/8" aft... but the BOTTOM of the firewall is 11/16" aft of the forward edge of the skins, exactly the same on both sides. So if I set 5/8" at the top edge, the firewall will have a slight downward tilt. Not much, maybe .15 deg or so. But I don't know if the firewall is supposed to be parallel with the front edge of the skin, or be 5/8" at the top and 11/16 at the bottom. I remember when building R/C models with my Dad, we'd have a little down and right thrust. This, however, is not balsa and pine.
My gut tells me make it parallel and set it to 11/16 at the top and the bottom. Anyone else run into this?
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