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jan_de_jong(at)casema.nl
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 Posted: Tue Nov 01, 2011 8:23 am Post subject: Stall warner-retrofit installation-classic (- Mod 61 B - Cl |
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Manfred,
For what it's worth - my opinion.
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* *
* 1/.) I know the instruction on Mod 61B-Classic says that the hole of
the stall warner should be 52’’ (1321 mm) out from the aircraft
centreline, so far so good!/*
*/ I actually would like to know whether this point 52’’ is obligatory
or could it be 70’’?? And if it must be 52’’ what is the reason for
this exact point?? Does 70’’ from the aircraft/*
*/ centerline not work accurately? And why not? (Because I installed
already an empty tube to the 70” point at the beginning when
manufacturing the wing!!)/*
Wing section at 70" has slightly lower angle of attack than wing section
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at 52" and stalls a little later, but I think it will work perfectly
well. Actually, on new build the postion is at least 70" out on the wing
(past the flaps I remember) and in addition XS wing twist could be
greater than Classic wing twist (?).
| Quote: |
*//*
*/2.) I understand that a vacuum appears on a special point _below_
the leading edge if in stall configuration. /*
*/ But to my past knowledge in air-pneumatics on the leading wing
edges there should still appear a pressure instead of a vacuum when
the wing comes to the stall. I looked /*
*/ into many /*good aeronautical text books containing the theory of
stall characteristics but I always found a pressure there!?//
*/ I would like to understand the airflow = pressure or vacuum = on
the leading wing edge in stall configuration on our type of wing./*
*/ Could someone give me some hints, where I could see/read the
theoretical background on this subject? Perhaps on the internet?/*
At high angle of attack stagnation point (pressure = dynamic pressure)
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moves to underside of wing. Somewhere just below leading edge pressure
drops to below static pressure.
Stagnation point: see attached.
Interesting book including stall warner explanation:
http://www.av8n.com/how/
| Quote: |
*//*
*/3.) In the retrofit installation instruction (Mod 61b Classic) it
calls at page 5 for a _‘W39 probe’_ to be installed at a special angle
as per the ‘hole template’!/*
*/ What kind of ‘probe’ is that? Is it just a small brass or aluminium
tube of 3 mm inside diameter, or is it a special manufactured ‘probe’
with a sophisticated inside/*
*/ configuration? Is it a must buying it, or could I manufacture it
myself?/*
Must be just an installation aid - on new build the probe is nothing but
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a 5052 aluminium tube.
Inside diameter 3 or 4 mm, 1 mm is enough. Will allow tuning the hole
position up/down somewhat later.
Regards,
Jan de Jong,
filling the canoe of #461
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jan_de_jong(at)casema.nl
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| Posted: Tue Nov 01, 2011 8:38 am Post subject: Stall warner-retrofit installation-classic (- Mod 61 B - Cl |
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Manfred,
Sorry, where I said dynamic pressure I should have said pitot pressure
or total pressure = static + dynamic pressure.
Jan de Jong
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davidjoyce(at)doctors.org
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| Posted: Tue Nov 01, 2011 8:49 am Post subject: Stall warner-retrofit installation-classic (- Mod 61 B - Cl |
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Jan, I suspect that almost anywhere not in the prop wash and not close to
the tip would do. You end up by adjusting the pressure sensor head to sound
off at a chosen speed above the stall anyway and I guess that adjustment
would be valid anywhere in the central wing section. I suspect that the 52"
bit is the shortest length (to make retrofit as easy as possible) that is
reliably clear of prop effect.
Regards, david Joyce, G-XSDJ
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graeme bird
Joined: 15 Jul 2010
Posts: 434
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| Posted: Tue Nov 01, 2011 9:51 am Post subject: Re: Stall warner-retrofit installation-classic (- Mod 61 B |
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I recently brought this mod and did it. Its just a short length of around 3.2 inside dia tube with a smaller tube fixed in so the pvc tube goes on. The kit did seem rather expensive seeing its just an RS sensor/switch but then the air connectors are fairly pricey and Europa have to survive somehow. I didnt see the point of providing the wire loom as each installl will be different.
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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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pjeffers(at)talktalk.net
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| Posted: Tue Nov 01, 2011 5:37 pm Post subject: Stall warner-retrofit installation-classic (- Mod 61 B - Cl |
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Manfred,
With respect to the classic wing, this location of 52" ensures that you do
not need to penetrate the rib which is located just beyond this distance.
Pete
--
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