Replies to This Discussion

Permalink Reply by Jerome T Martin on November 13, 2010 at 10:09pm

Einar Arne;
Go to drawing 7F9. If you are referring to 7F9-8 rear stiffener. Look at the drawing for the 1400mm 3/4 x 3/4 stiffener.
Note above says:
Drill corner relief hole in top flange (of 7F9-8 angle) bend is 30 degrees in line with aft bend in the cabin side skin. 7F9-1
Note: cabin side skin is bent 15 degrees inboard.
If you have already figured this out let us know what the problem was.
Jerry

• ▶ Reply

Permalink Reply by Einar Arne Kleiven on November 15, 2010 at 3:02pm

Hi Jerome

My reliefhole is ok, at the aft end of the "sidepanel".(7F9)

My issue is pointed to the A-A line in drawing 7F9: If you look at the drawing and find A-A. to the rigth is 7F9-5 and it is fixed to the front and is vertical by 90 degr (OK)

If you look to the left of A-A you find the bend line(following the front of the aft fuselage)and that "area" is angeled innboards. (due to narrower top-fuselage) (OK)

Because of these 2 outerpoint are not at the same angle, you will get a naturally "twist" in the sidepanel (OK)

BUT BUT: the seatfront side (7F11-1), is cutted with 90 degr. Resulting that all the "naturally twist" will only be possible to do behind(aft) the seatfront......

AND THAT is bending (more than I like) the 7F9-8, between A-A and the 7F9-3

At the picture I am pointing at the area, that I would have changed the drawings ( if I were a designer). Making a angled cut, at the ends of the seatfront.

But maybee my 701 is going to be strong enough anyway, because the design is well-prooven...At least: I do not loose my sleep at nigth because of this....

(thanks for the innterest, in maybee a difficult thing to understand?)

Einar-Arne --- Norway

Attachments:

• Høst2010 080.JPG, 2.3 MB

• ▶ Reply