Today's Message Index:
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1. 12:47 AM - Re: The Obsidian Files - Doorly Departed (Area-51)
2. 12:50 AM - Help please: PV50 lead screw (IanGale)
3. 01:26 AM - The Obsidian Files - Departed Canopy (Area-51)
4. 01:46 PM - Re: The Obsidian Files - Doorly Departed (Area-51)
Message 1
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| Subject: | Re: The Obsidian Files - Doorly Departed |
Some further numbers were run this afternoon after William's comment, focusing
on trailing wash affecting the horizontal stab and items snagging on a control
surface.
Airspeed was increased from 100kt to 150kt with some interesting results... basically,
flying faster reduces the turbulence within the cockpit after a door departs.
The other outcome noticed while slicing through the layers of velocity tracing
was all the turbulent flow exits the cockpit at the top center of each door port;
the sides of the fuselage remain fairly unaffected and away from the wash;
so it would not be too untrue to assume anything such as cloth or lite items
sucked out of the cockpit possess little chance or risk toward hitting or snagging
on the horizontal stab.
So the numbers indicate fly faster to be in a windy bus stop, or fly slower and
sit in a tornado... personally not excited or outwardly wishing anybody find
themselves in the situation to prove the theory correct.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=510694#510694
Attachments:
http://forums.matronics.com//files/7c56e3b5_61c7_45c8_92d7_d7f8463505bf_175.jpeg
Message 2
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| Subject: | Help please: PV50 lead screw |
My Arplast PV50 lead screw bearing has gone a bit crunchy so needs replacement.
Im looking for tips and advice please from anyone who has done this before I
start to disassemble. At the same time Im looking to create some spares so if
anyone has the dimensions for the lead screw, bearing and the other parts, or
can help me as to where they sourced them, thet would be much appreciated. Thanks
in advance
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=510695#510695
Message 3
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| Subject: | The Obsidian Files - Departed Canopy |
This file entry leads on from and related to the Doorly Departed file.
The weather is still crap for everything but ducks, so more numbers have been crunched
as ideas and what ifs spring forth from the ether...
This entry looks at a loss of canopy during flight at 100kt.
With the doors already suppressed the canopy was removed and numbers once again
put through the magic grinder.
What was revealed... the aircraft will still fly without a front canopy or doors...
the turbulent flow within the cockpit is lowered to chest height with the
majority of swirl at across the breadth of the rear of the cabin, leaving the
occupant's heads above within 50kt fast moving free stream air; very exciting
moment requiring good wrap around eyewear... Turbulent air exits the cockpit
along the entire rear breadth of the door port out along the empenage, and along
with air drawn up from the fuselage belly will shield about 50% of the horizontal
stab in very slow moving air; so highly reduced pitch authority would
be a highly probable situational expectation.
With only one door departed the above affects are divided to the side of the departed
door.
That's all for now upon a front canopy departing...
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=510696#510696
Attachments:
http://forums.matronics.com//files/19e5ad44_8ee0_4b79_87a3_7e0915b5be48_850.jpeg
http://forums.matronics.com//files/780ecfbd_ae82_4c66_a9ad_a2ee2aba077a_251.jpeg
http://forums.matronics.com//files/8ee5fd84_925f_4e13_bd4d_bcbfbeb54497_170.jpeg
http://forums.matronics.com//files/c76baa9d_70bb_4788_babe_0627868ffa21_169.jpeg
http://forums.matronics.com//files/e4eda943_a068_4bdb_b466_f2feeb858f9b_121.jpeg
http://forums.matronics.com//files/b7c855d6_c9fb_44a9_af2f_6b3ea0cbc391_462.jpeg
http://forums.matronics.com//files/29b82d9d_9988_4201_8e69_1f40bae089dc_188.jpeg
http://forums.matronics.com//files/981f8084_5b7f_494c_a1de_7da686e563ef_190.jpeg
http://forums.matronics.com//files/9e836eae_fe45_4e26_a5c4_3ea06bab34fe_217.jpeg
Message 4
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| Subject: | Re: The Obsidian Files - Doorly Departed |
More insight was extracted last night from this study... the above image indicates
how the air enters the cockpit after the door has departed; at the lower rear
frame rail... it then whips around at the centerline toward the front for
the uppercut rearward exit; this creates a vortex in the lower luggage well, and
another in the front footwell to head area.
Several deflectors were tested at 100kt.. upper forward rail visor, side forward
visor, a lower side rail board, and rear lower rail louvre... all additions
performed some affect with the louvre setup providing the best outcome toward
reducing cockpit turbulence to a pleasant level while doorless.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=510701#510701
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