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  1. crysta1c1ear

    planetary gear

    To get used to planetary gears, it helps to be able to visualise how they move. Ever pushed a box along on some sort of logs or tubes used as rollers? Notice how the rollers always come out at the back? Put a pencil between two CD cases and you can slide the bottom one left and the top one...
  2. crysta1c1ear

    planet gear centres

    I'm not sure I understand your question. For teeth to mesh they must have pretty much the same spacing (teeth per inch) on each gear (sun,planet,ring) and so the radii of the gears are in proportion to their number of teeth. Since the teeth interleave the question arises to what you take as...
  3. crysta1c1ear

    Formula One adjustable wings

    I believe Barichello's Brawn GP (ex Honda) damaged his nose cone in the Australian GP and had it replaced. I don't recall any mention of leaks or spills on the track or in the pits. I know that leak-proof clip on fittings are possible, for example that was the whole business of Oystertec PLC...
  4. crysta1c1ear

    Formula One adjustable wings

    I'd go for the stepper motors sugested above, but I'm guessing. One of the cars recently had it's nose cone replaced after an accident and the TV commentator mentioned that they have to align the connectors. That sounds electrical to me.
  5. crysta1c1ear

    Question about KERS

    Out of this 2000 kJ, how much can be recovered by KERS assuming that there is no limitation by FIA? What do you mean by recovered? You can recover as much energy as you like within the limits of what is available: time spent braking, (eg 15 seconds per lap) and a maximum allowed recovery rate...
  6. crysta1c1ear

    Specific heat capacity

    http://www.engineeringtoolbox.com/carbon-dioxide-d_974.html http://www.engineeringtoolbox.com/nitrogen-d_977.html Specific heat capacity - cp - (kJ/kgK) At 300K Carbon Dioxide 0.846 Nitrogen 1.040 At 1000K Nitrogen 1.167 Carbon Dioxide 1.234 I guess the documents you are looking at...
  7. crysta1c1ear

    A complicated question

    I am missing something here. How can you lift 300 lbs with 100 lbs of thrust? Surely you need 300 lbs of thrust!
  8. crysta1c1ear

    Why flags flutter

    thread1-180705 ||_____ ||\ \ \| || \ \ | ||-----| || || The old thread has been closed, so I've opened a new one to continue the discussion. I watched the formula 1 grand prix on TV at the weekend, and at the start of the grid they had flags for "formula 1" and for "the FIA". These flags...
  9. crysta1c1ear

    Fuel Savings Transmission Neutral vs In Gear at Stop

    Pulling up at traffic lights, the engine can be turned over using the kinetic energy of the vehicle instead of fuel. If the foot comes completely off the accelerator (and it should), then fuel can be cut off. In neutral, fuel is required to keep the engine at idle RPM. I think that's half the...
  10. crysta1c1ear

    Is Propeller Spiraling Slipstream a myth or provable fact?

    Oh, so let me give a direct answer to the question. Is Propeller Spiraling Slipstream a myth or provable fact? I'd say it is provable fact. Non-symetrical rudders are there to counteract torque from the propellers running at a steady speed and that torque is the equal and opposite reaction...
  11. crysta1c1ear

    Is Propeller Spiraling Slipstream a myth or provable fact?

    Someone mentioned accelerating the propeller and its effect on the plane - the need to apply the rudder etc. I believe that is due to conservation of angular momentum between the propeller and the body of the plane. If the propeller accelerates clockwise in front of you, then the plane will try...
  12. crysta1c1ear

    High speed trains - tunnels

    I believe high speed trains don't go at high speed in tunnels. So I'd just describe it as trains in tunnels.
  13. crysta1c1ear

    Max Range vs Max Endurance

    Why is it that the minimum sink speed is lower than the minimum drag speed? I would expect to get max time in the air if Lift is a max and drag a minimum ( at L/D max speed). To stay in the air for the longest possible time, you don't care what drag is. If you can get more lift great, even if...
  14. crysta1c1ear

    Drag vs speed curves available for modern cars

    http://www.epa.gov/otaq/cert/veh-cert/cert-tst/08actrr.zip I downloaded one of the files, saved it with a .CSV file extension instead of .TXT (after looking at it with an editor), and just clicked on the file to start my spreadsheet program and load it. The field seperator was actually TAB...
  15. crysta1c1ear

    Turn gasoline into fuel fit for diesel use

    I've heard of a farmer replacing diesel with a mixture of oil and petrol, where the oil is probably mainly rapeseed oil, but maybe some sunflower oil. The aim was not to use petrol as an alternative to the diesel, but to use the oil which came from his own crops. I don't remember the...
  16. crysta1c1ear

    Max Range vs Max Endurance

    It's a shame I can't scrub a few sentences on that last post. I have been drinking! Naturally that would be achieved at the least drag speed, just like for max range (no wind). If you are just trying to stay in the air as long as possible, then you aren't trying to get anywhere and can be...
  17. crysta1c1ear

    Max Range vs Max Endurance

    The books say that fuel consumption depends on engine power .... I think the key word there is 'engine' - engine power. If the airplane is standing still with max rpm, the power is zero because speed is zero, but we still have thrust and of course the fuel flow is going to be high. If you...
  18. crysta1c1ear

    Custer Channelwing

    http://www.aviationexplorer.com/Girls_and_Airplanes_Aviation_Calendar_Models/fly%20girls.jpg As I se it, this is another example of the technology used but not refined and perfected.
  19. crysta1c1ear

    Custer Channelwing

    I believe mounting the engines above the wings so that the plane gets extra lift from the wash over the wings has been a standard practice in the past. The Channelwing just seems to be the same technology taken to the extreme. So personally I don't have any problem believing it. If I ever make...
  20. crysta1c1ear

    Vertical axis windmill question

    Sound is carried by air molecules and the speed of sound is around 330 m/s. Since wind speed is significantly less, air molecules will have no problem getting in and out of the rotating cage. You can shout to somebody upwind of you. So wind speed is slow in comparison and the air will go...

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