> > That makes some kind of sense, but it has made me rather suspicious of
> > blowing air onto one side of the tube without also making sure some air
> > gets around the other side too.
>
> Right on, Ian.
> This is the same principal that makes an airplane fly.
> The velocity of air passing around the tube envelope
> must be sufficient to create a low pressure area. This
> will allow the air stream to conform to the shape of
> the tube envelope all the way around it. One can demonstrate
> this principal by directing a hair dryer to the front of your
> neck. If the blower is powerful enough, you can feel the
> air all around your neck, and the hair on the back of your
> neck will dry without direct application.
>
> //The Bernouli Effect, which allows airplanes to fly, surely does have
> daily non-aerospace applications. -WB2WIK/6
>
> That is why I do not understand all the "dumbing down"
> of amplifier cooling systems going on in the interest of
> ham shack noise reduction. IMO, very few amplifiers designed
> for the amateur market have excess air to spare. Few hams
> have stood around an industrial 1500 watt RF generator and
> heard the noise required for 100% duty cycle operation.
>
> There is no free lunch here....our cooling systems should
> be kept in a clean, well-lubricated state; not shackled with
> rpm reduction devices in the line. Each blade in a blower
> or fan is a miniature airfoil. Efficiency is greatly reduced by
> dirt/dust adhering to them.
>
> You fortunate guys that have a closet full of spare tubes
> may disregard the above advice!
>
> (((73)))
> Phil, K5PC
>
>
>
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