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  1. Boathouse

    Is Propeller Spiraling Slipstream a myth or provable fact?

    Look at the exhaust stacks on many PT6 installations....rotated to take advantage of prop swirl. They also leave exhaust trails down the fuselage, ask any PC9 mechanic!! Wiped many off myself. I remember there was a fair bit of aero work done on the Beech JPATS PC 9 derived contender to stop...
  2. Boathouse

    fuel additive

    Pratt and Whitney have a Service Bulletin whose number escapes me at the moment that gives dosage levels for a lubricity enhancer called DCI4A. It is actually a corrosion inhibitor primarily but does "up" the lubricating properties of the fuel as a by product. The dose levels are so small that...
  3. Boathouse

    twisting rotorblades

    They definately will not be going on an F model. Erickson built the only F models and only they and their Italian customer operate F model cranes. Sikorsky never actually built an F model. So it will be the restricted category guys only. Interesting how your customer has 95% of the drawings...
  4. Boathouse

    twisting rotorblades

    VMSETHAN, I am assuming you are going the STC route for these blades and not trying to PMA the things? That would be extremely tough. Even though restricted category, your blades will be subject to the same Part 29 regulatory "guidance" as an OEM blade. I think you will find that "We have...
  5. Boathouse

    FAA Aerodynamic DER

    FAA Order 8110.37D Chart G is what I think you need. Then go to the FAA website and search the DER listing (a .pdf file unfortunately) for the person with the right delegation. Chart G guys can find compliance for the testing side of things by the looks of it. Is that what you are after?
  6. Boathouse

    Fuel line Fire Protection

    If you have detection, suppression and a shutoff valve on the firewall that is fireproof you may well get away with aluminum tubes / fittings for fuel. Rational being that you detect the fire, shut off the supply of flammable fluid and suppress the residual fire all within the fire resistant 5...
  7. Boathouse

    twisting rotorblades

    The main rotor blades for the CH54 and S64 (CH53 are the same I believe) are manufactured using an extruded aluminum spar with fabricated sheet metal pockets bonded onto the rear face. The spar is a "squashed D" section and is most definately twisted down its length (as most blades are). The...
  8. Boathouse

    How bad is it in the US?

    Didnt Michael Douglas play a disgruntled engineer with an AR15?? Can't remember the movie title though....
  9. Boathouse

    What the heck are Blow Out Doors?

    When I moved from the OEM world to an owner/operator/OEM world, the thought of PMA parts scared the brownstuff out of me...what do they (PMA houses) know about how a fuel nozzle of vane works? Turns out quite a bit in reality. They have to qualify the part by either test and computation or by...
  10. Boathouse

    304 cres bushing in 6061 aluminum fitting

    Thanks for the useful input guys. Cheers Boathouse
  11. Boathouse

    Operating a gasturbine in different positions or attitudes

    The engine OEM will have an installation handbook (or similar) and it should give you limitations for operating pitch, yaw and roll angles along with durations at these limits. If you look at the V22 installation, the Allison (Rolls Royce now) engine is operated in the vertical through to...
  12. Boathouse

    Driving on the Left

    When I moved to the States I found the hardest thing about driving to get used to was the rearview mirror not being where hundreds of hours of preconditioning driving said it should be...I kept taking furtive glances at the door post. I believe the helicopter pilot positioning is due to the...
  13. Boathouse

    A Mental Challenge for Aero Engineers

    Has anyone mentioned that anti-corrosion coatings do not like sharp corners? Very hard to plate to a sharp edge. Just under 2 cents worth!
  14. Boathouse

    304 cres bushing in 6061 aluminum fitting

    We have a situation designed by the OEM of a 304 cres bushing being press fit into a 6061 fitting. It is a dry fit, no plating or passivation called out. As part of a repair, we intend to seal both ends of the bushing/fitting interface effectively keeping moisture out and (from my limited...
  15. Boathouse

    Sending drawings out to the fabricator

    Just a question to Reggie1968. If you extract a dimension by measuring off of the blue print and do not get the drawing updated, what do you inspect the part to?? In my experience, unless the drawing is a non-dimensioned full size one (known as a lofted part, or flat pattern - which will have...
  16. Boathouse

    Who is to blame for US outsourcing

    The products I am referring to are gas turbine aero engines and the technology and expertise to install them in aircraft, helicopters, tanks etc. Once this experience is left to die out and/or exported then we will no longer have our lead in these fields. I nor anyone I know, will ever buy one...
  17. Boathouse

    Who is to blame for US outsourcing

    I had been involved (in my last company) heavily from a technical point of view with outsourcing engineering tasks to other countries. The top level management view was that an overhead rate of $15 USD per hour against our internal rate of $100 USD was a no brainer BUT what they didnt consider...
  18. Boathouse

    Aviation fuels technical data

    Hi Luis You might want to try this site: http://www.shell.com/home/aviation-en/html/iwgen/app_profile/aeroshellbook2003.html They have an informative (and free) CD Rom that can be mailed to you regarding all manner of aviation fuels, oils, greases etc. Hope this helps. Regards Boathouse
  19. Boathouse

    Tubing Package - positives / negatives??

    We ahd the routing package demo'd via a webex meeting a couple of days ago. The package appears to work well but shows its civil/construction engineering roots. It lacks the ability to automatically monitor minimum distance to first bend, minimum distance between bends, give tubing length when...
  20. Boathouse

    Tubing Package - positives / negatives??

    Any thoughts from users on the available Solidworks tube routing and design package? We are considering this as a time and effort saving device since we do design a lot of airborne tubing systems here - fuel and hydraulics primarily. I have also heard that the new package has a harness routing...

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