wemjot.das(at)kabelmail.d
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 Posted: Tue Nov 01, 2011 5:05 am Post subject: Stall warner-retrofit installation-classic (- Mod 61 B - Cla |
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Hi to all EUROPA friends
This is not my first post, but after 9 years the second or third one. Now I’m doing the final works on my EUROPA Classic Kit No. 242 in order to get it to the sky next year hopefully.
While I‘m installing the ‘stall warner’ -Mod 61B- I’m faced with several questions which EUROPA Aircraft Ltd. GB (Karen Ward) could not answer fully yet.
Perhaps some of you who installed this Mod 61B already could help me on my following questions:
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!!)
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?
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?
Helpful hints would be appreciated.
Manfred Jann – Hamburg - Germany
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