Today's Message Index:
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1. 03:12 AM - Re: Re: Vents (D McFadyean)
2. 07:57 AM - Re: Skysports bendable capacitive probe calibration? (DannyBo)
3. 02:28 PM - Re: Vents (Griffo)
Message 1
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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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| Subject: | Re: Skysports bendable capacitive probe calibration? |
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Message 3
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Hi Duncan,
First rule of effective venting is: Location, location, location --------
Then comes design, as in shape & proportions NACA vents must be correctly proportioned
to work effectively, not just look the part (as in may auto types)
Then comes size.
Lastly, exit air rout & size
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46
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