mtv wrote:The Goose is a fantastic and hard working airplane. I'm betting that the price point on a new one, turbine equipped, is going to have to pretty much equal that of, say, a Cessna Mustang jet.
The belly skins are made from aluminum thicknesses that you just can't buy these days. It is a tank, in short, and very labor intensive.
Fantastic airplane, but the turbines really spoil it, in my opinion. A recip Goose is a wonderful airplane.
MTV
I hope Mike doesn't start thinking that I am picking on him, but I am going to correct another error he made in regard to G-21 series Goose amphibians.
The belly skins of a Goose (any Goose, Grumman or McKinnon) are nothing special. Because it is a flying boat, they are relatively thick compared to non-seaplanes, but you can still buy aluminum in the thicknesses used by Grumman...well, essentially. The original specifications for the forebody hull bottom skins were for .064" 24ST aluminum. Just like 2x4 lumber, many thickness of aluminum have been down-sized over the years - by .001". Now you would simply use .063" 2024-T3 aluminum sheet and it's technically still within the quality tolerance. The outboard panels that have compound curves formed into them (that transition to the chines) are made from 3003-1/2H (half-hard) and the aft hull bottom is skinned with plain-old everyday .040" sheet - probably the next most common thickness next to .032". On the other hand, most of the original skins on the sides and tail of the Goose fuselage were made from .028" 24ST but apparently that was being phased out even during the original production run of the G-21A series from 1937 until 1945 - Grumman's original drawings for the fuselage include a note which approves the substitution of .032 for .028.
He is right about the fact that it is built like a tank and labor intensive to build. There are very few straight lines on it and every rib and hull frame is different than the ones adjacent to them.