I found that small NACA vents in the standard position didn't flow any air at
all,
without the addition of a VG in front of the vent (after which the vent makes
a blast, and is quite noisy too).
Which suggests there's a bubble forming at the aft edge of the cowling. But I've
not been able to detect a bubble using oil-streak.
Perhaps there's a Reynolds number limitation on how NACA vents work??
Duncan McF.
> On 26 March 2021 at 00:04 Griffo <scangriffin@bigpond.com.au> wrote:
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> Nice work KJ.
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> I am surprised that the NACA vents do not deliver copious quantities of fresh
air
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> I live in Australia (very hot) and have always found them to be very effective
when made to correct dimensions , located appropriately and sized -
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> I see I gave the wrong information for Peter Anson Engineering - hope this
works:
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> http://www.ansoneng.com/
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> He makes a nice selection of different NACA vents & ducting
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> Read this topic online here:
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> http://forums.matronics.com/viewtopic.php?p=501098#501098
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