Check Da Vinci's "Codex on the Flight of Birds" dated 1505-1506. He was the first to propose man powered flight and his diagrams are on display in the museum of science in Florence Italy.
I can't speak to what the FAA might agree to, but aircraft parts are typically accepted by inspection departments for all the major companies simply by comparing the 3-D part model to the actual part. The X-Y-Z coordinate data can come from a CMM, Faro Arm or Faro Laser Tracker.
Since you have...
I am not sure if this answers the original question but the analytical work for airplanes looks at several V-n diagrams, representing all the extreme conditions, gross weight, minimum flight weight, max payload/min fuel, max fuel/min payload.
What the pilot sees in the FAA approved Flight...
Cessna in Wichita is hiring - not much surfing on the prairie.
Gulfstream in Savannah is hiring - You could try surfing on the Savannah River behind the container ships coming up river.
1. Matched steel dies heated to 350 to 400 degrees F and mounted in a brake press might form .125 2024-O and a .094 radius with no cracking or other deformation. Then heat treat to T42. This is not a routine operation and may not be addressed in any of the design process manuals but rather, a...
classictrial,
Normally, one would not think of depth of part when rubber forming. Think more in terms of flanges on ribs, frames or clips and brackets. The max length of flange would be perhaps 60-70% of the depth of the forming box.
A rubber head can push metal into a female cavity, but the...
Greg/Super,
There is inconsistency here. On one hand a lament, industry is losing the ability to do good stress work yet blaming marketing/management for not hitting empty weight targets.
An outsider might assume bad stress work leads to an unsafe airplane. Bad stress also leads to a heavy...
crackman/Superstress,
Thanks for the good answers to my off topic question?
The basis for my question is to see if the reliance on FEA is the reason why manufacturers (especially start-up business jet mfg) miss their empty weight projections so often.
This might make a good topic by itself...
class,
About 10 years ago I made a small hydro-press using a 6 inch cylinder and a 2,500 psi pump (about 35 U.S. tons).
The forming box was fabricated like a picture frame made from 2 inch channel iron (flanges out) welded to a 1 inch plate. The internal box dimension was 8 x 10 inches.
The...
Crackman,
I would be curious to hear your opinion on the use of CATIA/FEA vs. the old hand crank method. In particular, which is the more accurate predictor of the stress levels that get recorded during static test.
Topics on this thread are bouncing all over the place.
On the 787 claims for 20% fuel savings:
Boeing Vice President Walter B. Gillette, who heads 7E7 engineering, manufacturing and supplier teaming, counts the fuel savings as 8% from better engines, 3% from aerodynamic improvements, 3% from...
Aerohandel,
I always thought you designed the airplane around the engine (which sounds like that is what you are doing).
Once you select the engine, you do the best you can with what you have to work with in terms of meeting your performance goals.
aerodog
CESSNA1
So even with malfunctioning reversers, the 737 at
Chicago Midway should have been able to stop on
the runway assuming the pilot was flying otherwise
by the numbers, ie. at a 50 ft height over the end
of the runway, flying the approach at Vref plus
any adjustment for gusts, and...
Does any body know if Boeing factors in reverse thrust
when they calculate landing distances over the 50 ft
obstacle for the 737?
FAR Part 25.125(f) states you have to assume an engine
out condition upon landing so I always understood
reversers were never part of the stopping distance...
Wil,
The project is a development program.
The decision has yet to be made on whether to
stretch the extrusion in "O" then heat treat
or stretch in "W".
In either case, when joggled, it will be in
the "T" condition, so I suspect "T4" by
definition but I have yet to see a drawing...
