Recent content by Holmz

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    Designing a Plenum Chamber for Motorcycle Supercharging

    I hear that the A Graham Bell book is good... https://www.amazon.com/dp/1844253147/?tag=pfamazon01-20
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    Designing a Plenum Chamber for Motorcycle Supercharging

    Well NZ is only 180 degrees out from London. Hopefully your CFD calculations are more accurate than my guesses!
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    Designing a Plenum Chamber for Motorcycle Supercharging

    Where are you located? (I am guessing Nz) I am planning on making measurements of air flow versus intake versus RPM. Some calculated data against the empirical might be interesting. Good luck finding that book - has been out of print for a while. But I remember when I first read it.
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    Designing a Plenum Chamber for Motorcycle Supercharging

    In the 70's there was a book called "the two stroke tuners manual", which covered the theory very well. I just ordered a book last weekend, but it is not here and I doubt it is what you want. It only seems like a black art because people do not do CFD at home for their engines, nor is there a...
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    Why do F1 cars have wide tires?

    main reason == because they look. And the coefficient is not constant, but goes down as the pressure (force/area) goes up. So running the widest gets a better coefficient averaged across the tire/tyre. But wind resistance, and inertia favor skinny wheels.
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    MATLAB Fortran 90 vs Matlab: Comparing Program Speed

    The advantage of F90 is not being used... Try this code. program D2D IMPLICIT NONE INTEGER(KIND=4), PARAMETER :: NxL=11 INTEGER(KIND=4), PARAMETER :: NyL=9 INTEGER(KIND=4), PARAMETER :: Nx=(2**NxL) ! Grid size X INTEGER(KIND=4), PARAMETER :: Ny=(2**NyL) ! Grid size Y INTEGER(KIND=4)...
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    Measuring Photon Force on a Sensitive Scale

    Gedanken did that experiment and it showed up as light bulb above his head.
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    Fortran How Can I Integrate Two Fortran Programs for a Game of Hangman?

    If I understand it right, then I think you will have to go through both subroutines. In fortran90 there is a mask which is used for array and vector functions. Maybe you could apply a mask to known or unknown letters.
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    How Can You Help Build a Steampunk Adiabatic Carnot Engine?

    After the part about your girlfriend leaving, the post stopped making any sense.
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    Overall Design of an electric solar carHelp

    You could take the bus and spend your time studying.
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    Designing a Plenum Chamber for Motorcycle Supercharging

    But why? What is the physics behind the shorter runners? The only reason I can think of is that the filling at low RPM is adequate, but at high RPM it is still lacking so short runners to optimize for high RPM, and low RPM sorts itself out...
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    How Can You Help Build a Steampunk Adiabatic Carnot Engine?

    Since methane would work - maybe you could just have a cow on-board and exhaust the methane into the balloon. And since methane is linked to global warming, maybe it might also heat the balloon. But something tell me this approach might be flawed.
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    Designing a Plenum Chamber for Motorcycle Supercharging

    I appreciate your being patient with me. But I am still at a loss to understand this, and I generally do not put 100% faith in wikis. In a pipe organ the pressure waves are going at speed of sound but there is little flow of air in the pipe. Lets say the engine is running at 6000 rpm, or...
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    Lens Design: Considerations for Lens Maker

    And... 1) scattering of light by the lens surfaces 2) bouncing around within the lens 3) light coming in at oblique angles and hitting the tube holding the lens(es). #1 & #2 are influenced by the coatings. Also if the focal plan is flat or not flat, Where the lens is designed to be...
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