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graeme bird
Joined: 15 Jul 2010
Posts: 434
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 Posted: Sun Dec 16, 2012 11:20 am Post subject: mono wheel rear faring |
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I fancy adding a rear fairing for the main wheel, has anyone made a mould they would be willing to share or any comments on the usefulness of such a feature, clearly the normal mono speed kit doesnt include it but I understand a round shape is bad for drag and it would also reduce mud splatter
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_________________
Graeme Bird
kit4 (Wagstaff) TBD
Kit3 G-CLXU (Gregory) mono 914 xs Woodcomp
Kit2 G-PATS - (kesterton) Mono Classic 912 warpdrive
Kit 1 G-UMPY - Mono Classic/XS 912S, Woodcomp G(@)gdbmk.co.uk |
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john.heykoop(at)gmail.com
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| Posted: Sun Dec 16, 2012 1:29 pm Post subject: mono wheel rear faring |
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Graeme
I added a main wheel fairing to my mono last year. It certainly was beneficial. Cruise speed has improved by 5 knots, although curiously maximum speed has not improved. One of my future projects is to try an find out why, by attaching a video camera to the underside of the aircraft and tufting the fairings, so that I can see what is happening to the airflow. One possibility is that the freestanding sides of the rear part of the fairing, which are only 3 ply thick, start to distort at high speeds.
Before embarking on this mod I contacted Andy Draper, who was very helpful. He told me that when they flight tested the Europa prototype G-YURO, which had separate controls for flaps and undercarriage, lowering the wheel even at cruise speed seemed to make very little difference to speed. They concluded that most of the drag must be caused by the big hole in which the wheel lives. The trick is therefore not just to have a streamlined fairing, but to make sure that the undercarriage cavity is sealed as well as possible.
Other useful hints were that the fairing should be constructed of 2 to 3 ply 'bid', so that it is sufficiently fragile to collapse in the event of a flat tyre or wheels-up landing, without imparting excessive loads on the fuselage skin. Also, that it is essential to incorporate a mud guard in the rear fairing.
I am afraid I haven't got a mould you could use. Nor do I have any decent pictures. The dimensions of my fairing are in any case non-standard, for my mono has enhanced gear retraction (the main wheel retracts about 2 inches deeper into the wheel well than normal).
Hope this helps.
John
G-JHKP
Mono 912S with Airmaster prop
On 16 Dec 2012, at 19:20, "graeme bird" <graeme(at)gdbmk.co.uk> wrote:
| Quote: |
I fancy adding a rear fairing for the main wheel, has anyone made a mould they would be willing to share or any comments on the usefulness of such a feature, clearly the normal mono speed kit doesnt include it but I understand a round shape is bad for drag and it would also reduce mud splatter
--------
Graeme Bird
G-UMPY
Mono 912S/Woodcomp 3000/3W
Newby: 45 hours
g(at)gdbmk.co.uk
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=390543#390543
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Fred Klein
Joined: 26 Mar 2012
Posts: 503
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| Posted: Sun Dec 16, 2012 11:33 pm Post subject: mono wheel rear faring |
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On Dec 16, 2012, at 11:20 AM, graeme bird wrote:
| Quote: | | I fancy adding a rear fairing for the main wheel, has anyone made a mould they would be willing to share or any comments on the usefulness of such a feature, |
Graeme...here's what I've done...I've used a mold borrowed from Alex Bowman...layup was 2 layer BID + stiffeners...note that the front of the portion of the fairing mounted to the LG fairs into the cowl...also made from Bowman's mold although was much modified...a nice winter project.
Fred
[img]cid:16AE2F2F-41C3-40E1-9574-8C3107873749[/img]
[img]cid:FE016191-4F5A-48C1-95F3-158485D9CBD4[/img]
[img]cid:5FEC94E4-196A-4283-95A0-4862527A1A03[/img]
[img]cid:584B1D65-73AD-410E-B830-68862B3D425E[/img]
[img]cid:9F1DC271-8D58-41B2-BB9A-606930398306[/img]
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graeme bird
Joined: 15 Jul 2010
Posts: 434
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| Posted: Mon Dec 17, 2012 10:57 am Post subject: Re: mono wheel rear faring |
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amazing, ta for the pics. I should want to be sure the wheel will latch up .. and also go down. That all looks quite tight considering my muddy field this time of the year at least.
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_________________
Graeme Bird
kit4 (Wagstaff) TBD
Kit3 G-CLXU (Gregory) mono 914 xs Woodcomp
Kit2 G-PATS - (kesterton) Mono Classic 912 warpdrive
Kit 1 G-UMPY - Mono Classic/XS 912S, Woodcomp G(@)gdbmk.co.uk |
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Troy Maynor
Joined: 10 Jan 2006
Posts: 162
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| Posted: Tue Dec 18, 2012 6:21 pm Post subject: Re: mono wheel rear faring |
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Wow Fred,
I know you said you used Mr Bowmans molds but that looks real impressive. Wonder what a set of those would cost to have some talented soul, with more time than me, to have made?? If you get my drift.
Troy Maynor
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h&jeuropa
Joined: 07 Nov 2006
Posts: 645
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| Posted: Mon Dec 31, 2012 10:50 am Post subject: Re: mono wheel rear faring |
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Graeme,
Back about 10 years ago, Kim Prout sold a fairing for the mono. It was available in carbon or fiberglas. Bob Jacobson and Cliff Shaw had similar fairings fit to their monos. You can probably find photos in the archives - look back to 2002, 2003. We can send you a couple of photos if you can't find any others.
Kim occasionally checks this forum. Or there may be a couple that were purchased and never installed.
We just looked at the new club website but couldn't find a link to builder mods.
We've had ours fitted since the first flight so can't comment on performance change due to the fairing, but it looks nice and doesn't weigh much.
Jim & Heather
N241BW
Mono - 914 Airmaster
425 hours
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