cenpen
Well-Known Member
I was looking at some original drawings of an certified airplane from the 1930s and noticed that they used a lot of 1025 steel tubing in it. It was mainly used in the engine mount area with 3/4" .049 where as the rest of the airframe is chrome moly 4130 in sizes from 7/8" down to 1/2".
So my question is why? My thoughts are that the 1025 was more forgiving for cracks and more malleable and took the vibration better? I doubt it was a cost issue??
Looking for the engineers view point out there as I don't think modern builders use the same format and use 4130 throughout. I think it is very interesting....
Your thoughts?
So my question is why? My thoughts are that the 1025 was more forgiving for cracks and more malleable and took the vibration better? I doubt it was a cost issue??
Looking for the engineers view point out there as I don't think modern builders use the same format and use 4130 throughout. I think it is very interesting....
Your thoughts?
