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  1. TugboatEng

    Air India 787 crashes on take off

    I get that but don't you think generators that operate the FADEC would have some mention in the MEL? With that said I am looking for mention of the 235v to 28v transformers in the MEL and haven't found them yet. BUT! I don't think that's relevant because it seems the RAT deploys in failure of...
  2. TugboatEng

    Sizing Generator- Florida Nursery

    Sure, the old 2-71 Detroit Diesels are a great example of a small sized, low output, high reliability, and long lived engine. Please, share an example of a similar engine that can be purchased new today. Canada may be different. We have emissions rules in the US. A modern 4.5L engine operating...
  3. TugboatEng

    Air India 787 crashes on take off

    People are still speculating about mast bumping on the Hudson river helicopter despite us having images of the top deck of the helicopter separating from the airframe...
  4. TugboatEng

    Air India 787 crashes on take off

    It's weird but that doesn't say that the airplane has PMGs. It's explaining that the independence of the VFSGs eliminates the need for 28v PMGs.
  5. TugboatEng

    Air India 787 crashes on take off

    Multiple sources is not an indication of quality. Articles use a lot of circular referencing nowadays. Maybe it was missed but this website has the most complete description of the electrical systems on the 787. There are no PMA or PMGs...
  6. TugboatEng

    Sizing Generator- Florida Nursery

    In my experience, if you want a durable reliable generator you need to buy something in a minimum displacement of ~4.5 liters. With modern engines this puts you at 65kW in a naturally aspirated package and 99kW in a turbocharged package. The reason I suggest the larger engine is that the you...
  7. TugboatEng

    Things are Starting to Heat Up - Part XIV

    If human caused climate change is global why would the flooding be concentrated in Texas?
  8. TugboatEng

    Air India 787 crashes on take off

    Remember VSFG is a starter generator. The VSFG's are not providing power during the start phase, they are a load. The battery starts the APU and the APU provides the power to start the engines and operate FADEC until the start is complete.
  9. TugboatEng

    Permeable Thin Material

    You want the acetone to exit and not the sorbent or do you want air to exit and not the sorbent acetone mixture?
  10. TugboatEng

    Air India 787 crashes on take off

    ATRU, ATU, TRU, FWD EP are the ones I can't guess.
  11. TugboatEng

    Air Force Diverts Missile Funds To Modify Qatari 747... Money is being taken from Sentinel ICBM program, which is over budget.

    Too open to be involved in classified projects but too vague of a description to mean anything. Are you a bureaucrat?
  12. TugboatEng

    Sizing Generator- Florida Nursery

    It has nothing to do with your problem it's just interesting to note that some voltages are not so common anymore and the difference will have little effect on your system. I have had boats in my fleet set up to run on 440, 450, 460, and 480 volts. When we plug into shore power I get 495V...
  13. TugboatEng

    Air Force Diverts Missile Funds To Modify Qatari 747... Money is being taken from Sentinel ICBM program, which is over budget.

    I wonder if the QCAA is trying to get their foot in the door as a regulatory agency with a bit less inertia than the FAA to advance modernization. What better advertising than to provide a civilian aircraft able to be certified as AF1?
  14. TugboatEng

    Air Force Diverts Missile Funds To Modify Qatari 747... Money is being taken from Sentinel ICBM program, which is over budget.

    3DDave, as engineer, I'd think you'd be more familiar with the challenges associated with differences in data collection methodology. You're comparing non-standardized data and assuming it has meaning. I trust your an intelligent person but here we go with that compartmentalization issue And...
  15. TugboatEng

    Use of Gate Valve for Throttling

    Remember, this is quite a large gate valve so the forces generated are going to be very high.
  16. TugboatEng

    Air India 787 crashes on take off

    I believe the videos showed no significant rudder deflections. The engines were at full power so any imbalance would require substantial rudder inputs, probably close to max as the speed is still low and the vertical stabilizer will have reduced control authority.
  17. TugboatEng

    Air India 787 crashes on take off

    There is no report yet. People familiar have simply claimed it isn't known to be mechanical because no advisories have been made. If the intention was to take down the plane or not, why would you even try to move both levers simultaneously? They could both be switched quickly enough...
  18. TugboatEng

    Explosion at fireworks storage facility in Northern California

    The owner of one of the companies storing fireworks in the building was denied a license to do so for being a convicted violent felon. Apparently he shot at another car in a road rage incident. He did receive state licenses... The property was zoned as agricultural. The building was not a...
  19. TugboatEng

    Air India 787 crashes on take off

    I read that the output range is 380-800 hz on the 787. I found this website with a detailed description of the electrical system. https://kb.skyhightex.com/knowledge-base/electrical-system-summary/ All power comes from 4 235vac generators. There are no separate 28vdc generators. 4 generator...
  20. TugboatEng

    Already Proven Technology Meets Milestone

    Scam is a bit harsh, maybe I'll change the title. I see projects like these and wonder how much public funding is being used to develop private capital. Are we investigating in development that has already been developed? Slapping the green energy title on it loosens scrutiny. I'm very...

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