Yes that is sort of what I was thinking, but a bit longer towards the
L/E to really blend it nicely. As for the frontal area, or Flat plate
area, I think I read (tried to find it again but cant)
That the FPA for drag is any surface between zero and approximately 45
degrees to the air flow, so any surface blended at an angle greater than
45 will have little to no induced form drag.
And the amount of skin drag as compared to the whole skin of the A/C
would be so small as to not be of any real concern I would think, again
I could be wrong. Obviously the inner hinge fairing could be very thin
possibly even just a blending at the front and a fill insert between the
two parts to close the gap when the flaps are up.
If anyone knows the actual figures for the FPA I would like to know
Regards
craig
From: owner-europa-list-server@matronics.com
[mailto:owner-europa-list-server@matronics.com] On Behalf Of
ami-mcfadyean@talktalk.net
Sent: Sunday, 29 October 2017 9:19 PM
Subject: RE: Europa-List: Re: Full trigear speed kit vs hinge fairings
only
Maybe the attached would qualify as a fence.
I made these years ago but never got around to fitting or flying them,
not believing that three 1/8" flap hinge plates edge-on to the wind
would create more drag than the greatly additional skin and frontal
areas of the fairing (although it has better form, with prospect of
pressure recovery).
Maybe one day!
Duncan McF.
----Original Message----
From: ami-mcfadyean@talktalk.net
Date: 15/10/2017 12:18
Subj: RE: Europa-List: Re: Full trigear speed kit vs hinge fairings only
Can't find anything in the NACA library, except:
http://naca.central.cranfield.ac.uk/reports/1955/naca-rm-a55c30a.pdf
which applies to swept wings.
Logically, there may be an effect in reducing the spanwise flow over the
outboard section of the (fowler) flap, when the flap is deployed. But
drag in that configuration is a definite advantage in getting the a/c on
the ground. Might be worth exploring to see if there is any detectable
decrease in stall speed?
Duncan McF.
----Original Message----
From: craigb@onthenet.com.au
Date: 14/10/2017 06:08
Subj: RE: Europa-List: Re: Full trigear speed kit vs hinge fairings only
While on the subject of the outer flap hinge, given its location, my
thoughts were it might be advantageous to turn that hinge faring into a
"fence" to help reduce spanwise flow.
What say yee gentlemen to that. Or is it a lot of work for no real gain
Regards
Craig
Kit 577, final prep before paint
-----Original Message-----
From: owner-europa-list-server@matronics.com
[mailto:owner-europa-list-server@matronics.com] On Behalf Of zwakie
Sent: Saturday, 14 October 2017 7:01 AM
Subject: Europa-List: Re: Full trigear speed kit vs hinge fairings only
jonathanmilbank wrote:
> I particularly like this quote from Bud: "The flap brackets
(especially
the outers) are a huge drag source. So is the gear. Gear drag is
interesting. The legs and brake callipers actually produce more drag
than
the tyres and wheels."
Exactly the two things I thought would be of interest to you and why I
posted the link (pure luck that I had read this article again earlier
this
week, otherwise I would not have thought of it [Wink] )
--------
Marcel Zwakenberg
XS TG || 912ULS || PH-SBR
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=473511#473511
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