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  1. P

    Harbor Freight Predator 670 V-Twin Horsepower tests

    Do the math and you'll see it doesn't even start to qualify as a supercharger.
  2. P

    Resurrecting the Dyna-Cam

    Position oil squirters in the proper locations relative to the crankshaft rotation/firing order that squirt directly on the inside of the cam. If you get them placed correctly and they squirt on the cam then you'll have a maximum lubrication on the powerstroke due to the oil flowing out to the edge.
  3. P

    Rethinking Propellers?

    Careful, I've used that argument on here before and it didn't go over well.
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    3-pass radiators

    It probably would have worked better if he had put them in series and dumped the hot water in the back one with the flow going forward into the front one and out to the engine. If you bring the air up close to the water temperature then you can have a lot of residence time but it's just not...
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    3-pass radiators

    Yes, the problem is getting enough air through the radiator at idle. He's kind of right because the power required to circulate water goes down. Generally that argument would be used in radiant heat systems, or in the case of an electric pump. If you're looking to dump heat then pushing more...
  6. P

    3-pass radiators

    Okay let's put some rough numbers to this. At 100 GPM and a 20° drop through a radiator accounts for 960,000 BTU per hour. That's the equivalent of 377 horsepower. Since cooling is roughly 1/3 of the total energy input than that pump can support roughly 377 HP depending on your radiator/engine...
  7. P

    Curtiss-Stinson Special

    Agreed, it will have very low stall speeds with that wing loading which will lead the problems at low speed.
  8. P

    Plans for Rocky Mountain Wings "Ridge Runner" UL/LSA Aircraft

    😱 All I can say is you gotta love flying to do that....
  9. P

    Change.org: Urge the FAA to Address the Deficit of Ultralight Aircraft Instructors

    Or do what I did and what I've repeatedly talked about on here. Find someone that trains with a J3 cub or similar and tell him you want about 8 hours doing the basics. I did it and it worked perfect. I even logged my 8 hours in case I'd ever want to finish. It's not complicated.
  10. P

    Turbocharger exhaust temperature?

    Sounds like me at work. I drive my co-workers nuts because I'm always modifying machinery etc to see how easy we can make it to operate. They're there to punch a clock and I'm there to to see how perfect I can make it. It's about the challenge of it.
  11. P

    look at Otto Lilienthal,glider airodynamics,flight testing

    Yep, and that's the real genius.... knowing what to keep and what to throw out.
  12. P

    New Ownership At Hartzell Raised Prices Within One Month

    And someday we'll be able to buy those company's back from those snot nosed kids for pennies on the dollar.
  13. P

    Schneider trophy racers were much lighter than Reno unlimiteds with same size engine

    Methanol and water do not form an azeotrope so the boiling point would be in between.
  14. P

    Schneider trophy racers were much lighter than Reno unlimiteds with same size engine

    Sorry, I was calculating the 7 minutes of race times very roughly based on 3900 HP with 1/3 of that as cooling load. I made notes in my post as is my habit and then proceeded on to guesstimate on takeoff, staging, landing rough guesstments and I got a call from work saying our filter press was...
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    Schneider trophy racers were much lighter than Reno unlimiteds with same size engine

    This represents about 9500 horsepower, or 7.1MW, or 24.3million BTU. Since we only cool roughly a third of the energy put into the engine that represents a 28,500 horsepower engine. Those engines could have been cooled with roughly 40 gallons of water plus enough to taxi. I don't know how much...
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    Schneider trophy racers were much lighter than Reno unlimiteds with same size engine

    This is what tspear was referring to...overcool the oil from a normal operation stand point. Now it can have a greater temperature rise absorbing more heat before it gets overheated. That was my earlier reference to physics, you have to do whatever you have to do to keep the oil/engine from...
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    Schneider trophy racers were much lighter than Reno unlimiteds with same size engine

    Oil can be run up to 250°F +/- so if it's getting higher than that then someone needs to re-examine the oil path/flow rate through the engine.
  18. P

    Schneider trophy racers were much lighter than Reno unlimiteds with same size engine

    I agree completely but if you're going to do it you're going to have to do it to meet the temperature requirements as well. No getting around physics. The question is why is a lower temperature important? Are these engines built differently somehow?
  19. P

    Schneider trophy racers were much lighter than Reno unlimiteds with same size engine

    And there it is right there in the article just like I thought... Law engineered the boiler system, but instead of using water, he used ADI fluid—a 50-50 mix of water and methanol—because it cooled the oil to a lower temperature than water alone.
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