NACA did a lot of studies and wind tunnel tests in the 1930s to optimize
these cowling designs. The bumps come about because they provide room for
the rocker arm enclosures while permitting a smaller cowl diameter, forcing
the air through the cylinder fins for better cooling.
Jim Nichols
Tullahoma, TN USA
----- Original Message -----
From: "Ian Nichols" <ian.a.nichols@xxxxxxxxx>
To: "Olympus Camera Discussion" <olympus@xxxxxxxxxxxxxxxxx>
Sent: Wednesday, October 17, 2012 10:54 AM
Subject: Re: [OM] IMG: Visitor from the Forties
> On 17 October 2012 16:34, Jim Nichols <jhnichols@xxxxxxxxxxxxx> wrote:
>
>> Thanks, Ian.
>>
>> It is hard to see from these images, but there is a circumferential
>> opening
>> at the back of the cowling that provides a smooth exit path.
>>
>
>
> Thought it would be something like that, which is very neat and, if done
> right (and it probably is here) could even add a bit of thrust due to the
> heat input along the way - a bit like the famous P-51D oil cooler.
>
>
>
> --
> Stand firm for what you believe in, until and unless logic and experience
> prove you wrong. Remember: when the emperor looks naked, the emperor *is*
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>
> -Daria Morgendorffer
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