Placing the larger flat end of the NACA shape forward will not allow the advantages of the inlet duct to be utilized.
The diverging shape of the inlet duct opens to match the shape of the vortices at the tip of the inlet. This allows a center section of the airflow to remain relatively...
Yes. I agree with Greg. Start there on the propeller. If you are trying to simulate an aerodynamic phenomenon between water and air then it will be a problem.
The Reynolds number will obviously be a factor but viscosity (dependant on all fluid factors: density, pressure, temperature, etc)...
Yes...I agree. I would not use Fsu (Psu) formulae to calculate Bearing Allowables for bearing. They are two very separate and different failure modes.
As Specialmission said, "The large airframers will use proprietary allowables developed from their own tests as well as Mil5 data."
But...
Some companies use interference fit holes for Hi-Loks and they are driven into the hole or pulled through using a temporary collar. They use approx a .0015/.0045 diameter interference for a pure aluminum stackup.
They open up the holes through the steel/titanium parts only with larger hole...
One structural difference is that the collar of the Hi-Lok and Lockbolt are different.
The Lockbolt collar (tail side) can be installed on a taper. Hi-Lok collars cannot be installed on a taper without a self aligning washer system or self aligning collar system.
However, Lockbolt collars can...
It is common practice to re-shot peen 7075-T6 and 7178-T6 forgings due to it's adverse SCC properties after disturbing the surface.
We generally never re-anodized a part due to the process involved. Most of the time the part would burn at the electrode contact points during the anodize (not...
I totally agree with you, Wil. It does mess up the process quite a bit because the sealant will collect on the drill/countersink cutter bit.
There are programs that are using this process with the faying surface sealant. The fasteners are installed dry but the faying surface sealant is...
Good point, Wil.
Also, some automated drilling devices provide clamp-up during the drilling process. This clamp-up alleviates the deburring process at the faying surfaces of parts in the stackup.
Some of the higher end machines will detect a "harder" material (i.e. Titanium, Steel) in the...
I have actually seen the application of a radius filler in a bathtub fitting also on a TCTO. They added this because the main tensile loading was parallel in the ST direction. They were trying to increase the surface area of one of the tension bolts.
A few years ago there were reports floating around industry about microcracks forming in 7050 series plate in the ST direction when Split Sleeve Coldworking was applied to a hole.
Does anyone know these report numbers?
Did SAE or AIAA have similar reports?
Does anyone else remember this...
My one cent:
But the temper does not match that of plate or extrusion. Also, that is an extremely tight bend radius for .125 sheet.
Here's a question that may warrant a new thread. I have heard countless conflicting opinions on this matter. Should a part be bent parallel or perpendicular...
Something that is interesting that I found; Heritage Boeing is the only OEM that uses Edge Margin. Everyone else seems to use Edge Distance. Mil-HDBK-5 uses Edge Distance. Heritage Boeing used to call Edge Margin the distance of the center of the hole to EOP if the load was normal to the EM...
This seems to be more company driven but it is mostly the same.
2D+.050 is the current Boeing standard for design. Way back when it was 1.7D for load running parallel to the edge if no buckling occurs. I do routinely see 1.5D on older designs from the 50 to mid 60's designs.
If I recall...
