Recent content by Ketch22

  1. K

    Decreasing Motor Torque Requirement With a Gearbox

    my goal is to rotate a 500kg(1100lbs) load to 90° in 1.5 seconds. This would be only the first question I would ask. Remember that work is defined by a mass moved over a distance in a specific time. So the bottom line is; no matter how you get there if you move the same mass the same...
  2. K

    Old plumber wisdom, is he right or not?

    Jonathan 212, I have run into the same scenario before. I believe I can also show were the old timers get their perception. Often old time plumbers did not run calcs. They operate from a series of "Rule of Thumb" basics. One of the things that used to be used (and still is in some circles) is...
  3. K

    Why isn't the Pneumatic Tyre used for suspension?

    As Chemair pointed out there is a lot more to vehicle comfort than just softness. I also rode a large Harley for many years. One of mine was a chopper that was converted to a "strut" rear suspension where the rear shocks were removed and replaced by a rigid post. It rode wonderful on a straight...
  4. K

    Automotive Car on Fire - Causes and Possible Methods of Prevention

    A couple of things to bring up as I am a late arriver on this thread. First, the incidence of vehicle fires. You would have to show that the increase of fires is greater than the increase of number of vehicles on the road. The evidence that I have seen is that when corrected to an incidence per...
  5. K

    Damping a trampoline on the 2nd floor

    Rocksolid, What is your physics background? Willem2's input is very good. The concept is impact impulse. With each bounce there is a force that needs to be dissipated (and returned in the case of a trampoline) which is what is bending the ceiling. Anything that you can due to divide the forces...
  6. K

    Automotive Idling or turning the engine off?

    Russ_Waters, Thank you for that. If I stay away from url shortening I cannot bring either to a direct download link. As Russ stated the Energy journal study is about peoples actions and perceptions. It can be searched in Volume 37, Issue 8, pages 2881 -2888 from August of 2009. If interested one...
  7. K

    Automotive Idling or turning the engine off?

    Hello again, There are two studies I located quickly one was published in the Journal of Energy policy in August of 2009. I could not find a good web link but it is visible and downloadable at : https://bit.ly/2wGkrcp There is also a study by SAE (this is the same one previously...
  8. K

    Automotive Idling or turning the engine off?

    It will take a little bit for me to track the studies down the last few that I have looked at showed that a gasoline engine broke even for energy at a 7 second shutdown and that Diesels broke even at near 10 seconds. There is some justifiable concerns with reduced starter motor life when city...
  9. K

    Storing Heat from a Radiator

    Two immediate thoughts come to mind. One you are definitely on the right track to introduce some thermal mass. As noted earlier a thermal wall of some type is of great use. It will warm when it is cooler than the space it is in (which should be close proximity to the burner and flue). Often...
  10. K

    How effective is a pocket car window breaker?

    That would be your answer. Very few cars have laminated side windows. The trend started appearing in 2017. The primary changer was that high end cars that were trying to improve the safety ratings needed better survivability in the difficult side impact tests. By using laminated glass the side...
  11. K

    How effective is a pocket car window breaker?

    You are correct, the antenna is on the outside. I think I mentioned it in the last paragraph of my first post ( # 28 of this thread I think). I use it almost as often as I do my punch. Here is a quick youtube of the idea, FactChecker is also correct it is about the sharpness of the material...
  12. K

    How effective is a pocket car window breaker?

    Your asking a very good question. I do not have any studies to share but I do have some input and good anecdotal evidence. First would be the configuration. Does each of the ones you are looking at have the same cutters and window spikes? Second would What are your realistic plans for...
  13. K

    How effective is a pocket car window breaker?

    Note two. The film on the inside of the window does not affect the hammer strike. That film is a simple low strength polymer. The high point load of the impact will immediately breakthrough and strike glass. The shattering effect that tempered glass exhibits is caused by a process similar to...
  14. K

    How effective is a pocket car window breaker?

    The previously mentioned spring type tools are very reliable and they work very well. Any of the side windows on your vehicle are tempered and they will come out in their entirety. Window films are a thin open polymer layer and they will tear free easily. One advantage is that tempered glass...
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