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Full trigear speed kit vs hinge fairings only

 
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jonathanmilbank



Joined: 14 Apr 2012
Posts: 201
Location: aberdeen

PostPosted: Wed Oct 11, 2017 4:16 pm    Post subject: Full trigear speed kit vs hinge fairings only Reply with quote

I'm reliably informed that the full trigear speed kit, in accurate flight tests before and after installation and flown level at Wide Open Throttle in calm air, showed a full 10 knot speed gain. I'm also informed that the same test performed at 65% power (4800 rpm, 26") gives about a 5 knot gain.

But I would prefer to fit only the flap and fuselage hinge fairings, partly because they weigh altogether approx. 1 kg while the full speed kit weighs 4.1 kg (9 lbs). Presumably the flap hinge fairings must give some drag reduction benefit, or else why would they be included in the kit?

Please would you tell me from your own experience how much speed is to be gained in the cruise with only flap/fuselage hinge fairings fitted. Thanks.


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Fred Klein



Joined: 26 Mar 2012
Posts: 440

PostPosted: Wed Oct 11, 2017 5:01 pm    Post subject: Full trigear speed kit vs hinge fairings only Reply with quote

Quote:
On Oct 11, 2017, at 5:16 PM, jonathanmilbank <jdmilbank(at)yahoo.co.uk (jdmilbank(at)yahoo.co.uk)> wrote:
--> Europa-List message posted by: "jonathanmilbank" <jdmilbank(at)yahoo.co.uk (jdmilbank(at)yahoo.co.uk)>I'm reliably informed that the full trigear speed kit, in accurate flight tests before and after installation and flown level at Wide Open Throttle in calm air, showed a full 10 knot speed gain. I'm also informed that the same test performed at 65% power (4800 rpm, 26") gives about a 5 knot gain.But I would prefer to fit only the flap and fuselage hinge fairings, partly because they weigh altogether approx. 1 kg while the full speed kit weighs 4.1 kg (9 lbs).

With the assumption that the wheel spats are part of “the full trigger speed kit”, irrespective of the weight implications, I would venture that they are the major source of the speed gain…

When you refer to “flap and fuselage hinge fairings”…(since the fuselage fairings are part of the flap mechanism)…I’m not sure if you’re referring to both the fairings on the fuselage and the fairings on the wings...the frontal area of the flap hinge wing fairings makes me suspect of any claimed benefit from their installation…whereas the fuselage hinge fairings also function to close holes in the fuselage...

- just the uninformed opinions of a would-be mono-driver…

Fred


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jonathanmilbank



Joined: 14 Apr 2012
Posts: 201
Location: aberdeen

PostPosted: Thu Oct 12, 2017 1:00 am    Post subject: Re: Full trigear speed kit vs hinge fairings only Reply with quote

My uneducated guess is that all the hinge fairings serve to smooth airflow, particularly the outboard hinges which I'm told are a significant drag source.

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zwakie



Joined: 03 Aug 2009
Posts: 125

PostPosted: Fri Oct 13, 2017 11:30 am    Post subject: Re: Full trigear speed kit vs hinge fairings only Reply with quote

Bud has a created a number of really informative articles in PDF format on various subjects, one of them is about drag reduction specifically and contains good information on the speed kit as well, see: http://customflightcreations.com/sitebuildercontent/sitebuilderfiles/drag103.pdf

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jonathanmilbank



Joined: 14 Apr 2012
Posts: 201
Location: aberdeen

PostPosted: Fri Oct 13, 2017 12:45 pm    Post subject: Re: Full trigear speed kit vs hinge fairings only Reply with quote

Thanks Zwakie. I have seen and read this before, but now I'm saving it for future reference. 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."

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zwakie



Joined: 03 Aug 2009
Posts: 125

PostPosted: Fri Oct 13, 2017 1:00 pm    Post subject: Re: Full trigear speed kit vs hinge fairings only Reply with quote

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 )

Another interesting remark was the drag caused by the brakes-part of the wheel-assembly, which makes me think if it would be possible/feasible/worthwhile to develop some sort of aerodynamic faring just for that part instead of having the complete bulky wheel pants (just thinking aloud here...)


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craigb(at)onthenet.com.au
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PostPosted: Fri Oct 13, 2017 9:09 pm    Post subject: Full trigear speed kit vs hinge fairings only Reply with quote

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

--


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jonathanmilbank



Joined: 14 Apr 2012
Posts: 201
Location: aberdeen

PostPosted: Sat Oct 14, 2017 1:25 am    Post subject: Re: Full trigear speed kit vs hinge fairings only Reply with quote

Hi Craig. An interesting thought which might have some benefit. Who knows? But the modification approval and associated flight testing costs are way beyond anything I'd want to contemplate. Your Europa will give you immense enjoyment with great performance in its standard form.

An old friend and acknowledged expert gave me some very good advice: "Whenever you might contemplate fitting some gadget to your fine creation, first borrow an example and set it down on a bench. If it doesn't immediately float upwards, then it's too heavy!"


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craigb(at)onthenet.com.au
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PostPosted: Sat Oct 14, 2017 2:45 am    Post subject: Full trigear speed kit vs hinge fairings only Reply with quote

An old friend and acknowledged expert gave me some very good advice:
"Whenever you might contemplate fitting some gadget to your fine creation,
first borrow an example and set it down on a bench. If it doesn't
immediately float upwards, then it's too heavy!"
Sounds a bit like the old race car motto. " If it breaks its too light, If
it doesn't break it's too heavy"

Regards
Craig

Do Not Archive


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Duncan McFadyean



Joined: 18 Jan 2011
Posts: 76

PostPosted: Sun Oct 15, 2017 3:20 am    Post subject: Full trigear speed kit vs hinge fairings only Reply with quote

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.

[quote] ----Original Message----
From: craigb(at)onthenet.com.au
Date: 14/10/2017 06:08
To: <europa-list(at)matronics.com>
Subj: RE: Re: Full trigear speed kit vs hinge fairings only

--> Europa-List message posted by: "craig" <craigb(at)onthenet.com.au>

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

--


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craigb(at)onthenet.com.au
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PostPosted: Tue Oct 17, 2017 1:34 am    Post subject: Full trigear speed kit vs hinge fairings only Reply with quote

My thoughts    were to blend from near the front of the wing, around the flap hinge and blend back out near the back edge of the flap,
which as you say would in effect fence the outer edge of the flap when the flaps are lowered, as well as “hopefully” a meaningful
reduction in drag on that hinge.

Regards
craig

From: owner-europa-list-server(at)matronics.com [mailto:owner-europa-list-server(at)matronics.com] On Behalf Of ami-mcfadyean(at)talktalk.net
Sent: Sunday, 15 October 2017 9:19 PM
To: europa-list(at)matronics.com
Subject: RE: 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.
[quote]
----Original Message----
From: craigb(at)onthenet.com.au (craigb(at)onthenet.com.au)
Date: 14/10/2017 06:08
To: <europa-list(at)matronics.com (europa-list(at)matronics.com)>
Subj: RE: Re: Full trigear speed kit vs hinge fairings only

--> Europa-List message posted by: "craig" <craigb(at)onthenet.com.au (craigb(at)onthenet.com.au)>

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

--


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