LettersFromFlyoverCountry
Well Known Member
On DWG 40, cabin frame installation side view , it indicates "fuselage station" with a measurement of 56 13/16. What is this referring to?
I'm not doing any work right now other than reading plans and this one stuck out.
Also, I'm trying to figure out where the base of the cabin frame fits in the brackets. That is, how high above the base. Looking at drawing 39, the height of the frame itself should be 17 19/32. On DWG 40, it shows a height above the inside base of the bracket of 17 28/32 (when I first looked at this, it looked like it was indicating the height from the longeron, but I'm interpreting a top line there to actually be the inboard edge of the longeron. Let me know if tis is not correct.
The front edge appears to sit abut 8/32" above the inside base. The rear edge appear to be resting just on the base of the F-631C.
However, given the original height of the frame of 17 19/32. Positioning the forward edge of the frame bottom 8/32 above the base of the F-631C bracket would yield a total of 17 27/32 or, 1/32" short of 17 7/8" callout on drawing 40.
Also on DWG 40, B-B, it appears to show the outside of the F-631C, just slighty inboard (maybe 1/64") of the side skin. When I'm measuring the width of the fuselage (to determine the width of the frame), I'm preently measuring from skin to skin. Should I adjust this meaasurement to reflect the fact that the brackets are not flush with the side skin location, or am I seeing an offset there that doesn't reeally exist?
I'm not doing any work right now other than reading plans and this one stuck out.
Also, I'm trying to figure out where the base of the cabin frame fits in the brackets. That is, how high above the base. Looking at drawing 39, the height of the frame itself should be 17 19/32. On DWG 40, it shows a height above the inside base of the bracket of 17 28/32 (when I first looked at this, it looked like it was indicating the height from the longeron, but I'm interpreting a top line there to actually be the inboard edge of the longeron. Let me know if tis is not correct.
The front edge appears to sit abut 8/32" above the inside base. The rear edge appear to be resting just on the base of the F-631C.
However, given the original height of the frame of 17 19/32. Positioning the forward edge of the frame bottom 8/32 above the base of the F-631C bracket would yield a total of 17 27/32 or, 1/32" short of 17 7/8" callout on drawing 40.
Also on DWG 40, B-B, it appears to show the outside of the F-631C, just slighty inboard (maybe 1/64") of the side skin. When I'm measuring the width of the fuselage (to determine the width of the frame), I'm preently measuring from skin to skin. Should I adjust this meaasurement to reflect the fact that the brackets are not flush with the side skin location, or am I seeing an offset there that doesn't reeally exist?