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  1. qchen98

    Use of WEP (War Emergency Power) On GA Aircraft

    They did test JATO take-off with an Ercoupe in 1941 with six small bottle that produce 28 pounds of thrust each. But each bottle weight 10 pounds so the power-to-thrust ratio is quite low. Very underwhelming i think. The more modern one produce 1,000 of thrust while weighting only 98lbs.
  2. qchen98

    Chinese military gyros

    We might need to ask the guys from EAA to organize such a fly-in event. Optimistically only 25% of loss would be attributed to mid-air collisions.
  3. qchen98

    Chinese military gyros

    Regarding the previous post about countering the gyro with Gepard SPAAG - it only has only a range of 5.5km. FPV suicide drones used in the ukraine war can eaily go over 10km. And they are cheaper than even an unguided anti-tank round. Since we have three occupants on the gyro, two of them...
  4. qchen98

    Use of WEP (War Emergency Power) On GA Aircraft

    Can we have this sort of throttle setting on our continental and Lycoming engines, without modifications that are too complex? A temporary 10% boost in engine horse power could be quite useful if you are about to hit a tree during take-off, even at the cost of an complete engine overhaul.
  5. qchen98

    Chinese military gyros

    The gyro can well carry two javelin missile equivalents and become quite combat-effective. But the airframe would cost less than the javelin missiles. Making it into a UAV can easily triple the cost. You can probably buy four gyros for the cost of one single Russian UAV.
  6. qchen98

    Crossing the Atlantic Ocean with a homebuilt jet or an electric aeroplane.

    How about flying in the jet stream if you could get high enough?
  7. qchen98

    Crossing the Atlantic Ocean with a homebuilt jet or an electric aeroplane.

    I think you could increase watt hour-to-weight ratio drastically by having a tons of RC lipo batteries loosely placed anywhere, without any hardshell or fixture that increase the weight of the assembly.
  8. qchen98

    Flying with a piston engine to FL 600

    Which one could fly higher? A motorglider with a turbo-charged engine, or a motorglider with a small jet engine which weight significantly less?
  9. qchen98

    Affordable Homebuilt Aircraft Kit With Homebuilt CNC

    Could an aircraft design be optimized for production on a homebuilt CNC router table? A guy had indeed machined most components of a Cri-Cri out of his homebuilt CNC router, but that plane is quite complicated and it was not designed with CNC machining in mind. If a manufacturer offers a kit...
  10. qchen98

    Future US light aircraft market and aircraft production?

    Multicopter-flying-drone-car
  11. qchen98

    Oceangate Sub Construction Details and Implosion

    Here is the full video of the aforementioned FEA analysis with all the details
  12. qchen98

    Oceangate Sub Construction Details and Implosion

  13. qchen98

    Oceangate Sub Construction Details and Implosion

    Indeed there is a Carlos who worked as an EE intern for Oceangate, I just found his profile on LinkedIn.
  14. qchen98

    Oceangate Sub Construction Details and Implosion

    Cup is made mostly of air, human is not. Human isn’t good pressure container too, once the air pushes out, the pressure would equalize quickly. So they don’t get squeezed into a ball. Does a dead whales automatically implode on its way down?
  15. qchen98

    Oceangate Sub Construction Details and Implosion

    Two endcap slamming together seems like a possible scenario. Perhaps at some point the collision created a high pressure difference that the porthole glass popped out - it’s designed to withstand pressure from outside not within. I don’t think the acrylic glassed failed although it’s not rated...
  16. qchen98

    NASA abandons (cancels) their X-57 electric plane project

    With the battery it will have the same wing loading as a glide bomb. Perhaps the same performance when the engine quits
  17. qchen98

    Oceangate Sub Construction Details and Implosion

    If the sub were within the influence of a strong underwater jet stream that can carry bodies to Haiti, they'd have to launch the sub 50 nautical miles "upwind" of the Titanic and recover it 50 nautical miles "downwind" of Titanic, since it takes 4 hours to get down and the sub cannot do more a...
  18. qchen98

    Oceangate Sub Construction Details and Implosion

    Appears to be the titanium ring that was glued to the CF tube. At 0:47, you can see that the viewing port missing from the doom. Theory 1: The acrylic viewing port failed rather than the composite Theory 2: The workers had uninstalled the viewing port so they can pass a rope through it as if...
  19. qchen98

    Oceangate Sub Construction Details and Implosion

    Human is made of water not air. The squeezing would stop at some point 4300 psi doesn't do much to an orange, and humans don't turn into goos.
  20. qchen98

    Oceangate Sub Construction Details and Implosion

    It has no EPIRB beacon but a single communication device designed for UAVs. Therefore the communication with the surface ship is limited to text only. Yes it has an emergency pinger which can last to six days on its own battery, but it seems the implosion knocked it out.
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