Recent content by FredGarvin

  1. F

    Parts, componets, and things that do stuff

    While McMaster-Carr is the most awesome-est company and website ever, you do have to be a bit careful in that they can add a good bit on to the price of some basic things. This is coming from someone who uses them on almost a daily basis, so I have a pretty good idea on this. Just do yourself a...
  2. F

    Which country will come out on top in the Canada vs. USA hockey game?

    Just to chime in about the stats: Plus-minus is a so-so metric. It is good if you only look at the + or - part. If you put in the magnitudes of the + and - then it gets less effective because it is then tied to the team's offensive output. There is nothing to distinguish between a player who is...
  3. F

    Change in velocity of air due to fan

    A nozzle makes a wonderful flow meter. Can you simply put a throat pressure tap and an upstream tap to measure the pressure? Then it is pretty easy to calculate the actual flow. The fan will most likely not put out the same flow with a different back pressure on it.
  4. F

    Comparing turboprop and turbofan

    Yes. There is a, although outdated method, that is called thrust horsepower. It is uses a selected reference speed of 375 MPH that the math works out 1 pound of thrust to 1 HP. THP=\frac{T*MPH}{375} Really, a more substantial and meaningful comparison is in thrust SFC or Thrust Specific...
  5. F

    First Post: Looking for an electric lever.

    That's the first thing I thought of, but it doesn't have a physical "lever" per say. It is an electric actuated switch.
  6. F

    Linear Dynamic Seal (water-tight)

    Just like what the folks at University of Michigan are doing. Why not simply use two pistons and then use simple o-rings? I know that would complicate the mechanics for you, but it would most like likely make this more robust simce something like this would have to live under water for very...
  7. F

    Hydrostatic Test: Calculate Leakage Rate of Thread & Coupling

    The true way to do it is to put a flow meter in line with the pressure producing part, i.e. pump. If the seals hold, there will be no flow. If there is a leak, the flow meter will tell you the rate. You can put a totalizer counter on the flow meter to give you the total amount flowed.
  8. F

    Hydrostatic Test: Calculate Leakage Rate of Thread & Coupling

    If the fluid is a gas and can be treated as ideal, just use Boyle's Law with the total test duration to get the volumetric flow of the leak.
  9. F

    How to remove moisture from a gas?

    Desiccant dryers will get air down to a -40 dew point. They do work but are expensive. I don't know of any small units.
  10. F

    What Are the Largest Gear Ratios Possible for a Steam Turbine System?

    With a small pinion and a very large internal tooth ring gear, you can get huge ratios. Think of how large things like radio telescopes, radar dishes, hotel rotating floors etc...move. http://www.strudel.org.uk/blog/astro/images/20050702_wheel.jpg
  11. F

    Who is ultimately responsible for the jet crash?

    There is one other aspect to this that should be mentioned. That is that when the word "blame" is used, it connotates an intent to cause harm or damage. I can't say that that appeared here anywhere. People will lose jobs over this kind of F-up in today's military. The 1950's? Who knows?
  12. F

    Who is ultimately responsible for the jet crash?

    Voodo's. Man what a cool aircraft. The list of people accountable is long on this one so I didn't vote in the poll. I can't say there wasn't a person who did not contribute to the accident. So let's start at the top: - Squadron Commander: Not staying on top of flyability status and...
  13. F

    The Sixth Generation Fighter

    No. I got your "point." They do use things developed in other programs. What you don't understand is that even with that and lessons learned from the F-22, the F-35 is a much larger scale program with 3 different variants including the STOL version which has a nozzle design that has never been...
  14. F

    Which country will come out on top in the Canada vs. USA hockey game?

    Brodeur should not have let in that Rafalski goal to get the lead back 2-1. What a punch to the gut that was. I agree that Brodeur was not on his game tonight. Good call about Luongo starting next game. This was a good game, but it's not the finals. I hope there is a rematch. Russia looked...
  15. F

    Is it possible to change the Torque in a gearbox by altering the inertia?

    You are wanting something for nothing here. You need to make compromises. That is what engineers do. You can not go against the physics.
Back
Top