Tek-Tips is the largest IT community on the Internet today!

Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!

Register Log in
  • Congratulations TugboatEng on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!

Search results for query: *

  1. WhiteRabbit

    Naca Duct for an Engine Air Intake and intake shape

    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...
  2. WhiteRabbit

    Volume Flow through Propeller

    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)...
  3. WhiteRabbit

    Which Bearing Allowable for Countersunk Fastener

    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...
  4. WhiteRabbit

    Hi Lok Installation and cold working

    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...
  5. WhiteRabbit

    Hi Lock and Lock bolts

    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...
  6. WhiteRabbit

    Post Shot Peen Material Removal/Surface Disturbance.

    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...
  7. WhiteRabbit

    Automated vs Manual drilling in aircraft assembly

    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...
  8. WhiteRabbit

    Automated vs Manual drilling in aircraft assembly

    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...
  9. WhiteRabbit

    Bathtub fitting with radius filler

    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.
  10. WhiteRabbit

    Peery answer key

    Also, Make sure there is in an index in it. I know some of the later editions were missing the index.
  11. WhiteRabbit

    Split Sleeve Cold Working

    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...
  12. WhiteRabbit

    Minimum bend radius

    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...
  13. WhiteRabbit

    Aircraft edge distance

    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...
  14. WhiteRabbit

    Aircraft edge distance

    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...
  15. WhiteRabbit

    deburring

    The thread name was "Mental Challenge for Aero Engineers."
  16. WhiteRabbit

    Boeing Fasteners

    You can always cross check the QPL. It usually states what the part numbers are for the vendors. This is usually a good cross reference.
  17. WhiteRabbit

    deburring

    I was just thinking about that thread. Wil had to take off for awhile. I think he may have forgotten about that thread. I'll let him know we're looking for him.
  18. WhiteRabbit

    Qualified Products for M7885 and NAS9310

    One fastener can also be multiple certified as different part numbers. I am not stating this is the case in this particular issue these blind rivets. I know for some rivets and Hi-Loks one fastener can have different part numbers, (HLT***, BACB30**, 3D00**). Plus, the OEM may have a spec...
  19. WhiteRabbit

    NAS1097 vs MS20426

    You can also use (Csk Dia - Shank Dia)/[2*(tan 50)] to calculate the csk depth. Douglas uses 70% csk depth. It seems that it is more dictated by specific program philosophies. One half dozen...
  20. WhiteRabbit

    Titamium-Columbium Alloy Solid Rivets?

    Wil, The C-17 uses these fasteners heavily in the Flap and Slat and engine fairings. You may want to contact BASC about these as I know you already have connections there. Mil-HDBK-5 has some driven shear strength allowables. These fasteners are mainly used in high temperature applications on...

Part and Inventory Search

Back
Top