Today's Message Index:
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1. 01:56 AM - Re: Re: The Obsidian File - Mono Wheel Fairing (Pete)
2. 03:08 AM - Re: The Obsidian File - Mono Wheel Fairing (Area-51)
3. 03:08 AM - Re: The Obsidian File - Mono Wheel Fairing (Area-51)
4. 05:12 PM - The Obsidian Files - Doorly Departed (Area-51)
5. 05:47 PM - Re: The Obsidian Files - Doorly Departed (William Daniell)
6. 08:02 PM - Re: The Obsidian Files - Doorly Departed (Area-51)
Message 1
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| Subject: | Re: The Obsidian File - Mono Wheel Fairing |
Fence details?
> On Apr 24, 2023, at 12:15 AM, Area-51 <goldsteinindustrial@gmail.com> wrote:
>
>
> Brunch has turned into lunch..
>
> The fence concept has provided value by reducing the acoustic pressure pulses
to almost zero and assisting in keeping trailing turbulence tighter within the
fuselage centerline... Drag and Lift gains and losses were not anything worth
noting; mostly "shut that noise up"; advantages being greatest using the semi
enclosed fairing option, however both semi enclosed and standard setups nullified
the trailing pressure pulse effects... two thumbs up on this one.
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=510684#510684
>
>
>
>
>
>
>
>
>
Message 2
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| Subject: | Re: The Obsidian File - Mono Wheel Fairing |
Lunch has now turned into dinner.. there was a brief hiatus in the weather where
the sun came out and a bunch of bananas were lopped from the tree and many hands
cut off; of bananas, not apes...
So just for entertainment and curiosity the fence concept was extended further
to a more aft limit.. that worked favourably; so the concept was developed into
a rib extending to around 1m short of the stern. And that appears to also work
favourably toward keeping air flowing neatly and quietly downstream to the
undercarriage. A secondary affect if shaped with foam and glassed over would be
added rigidity of the belly skin and less tendency for panel drumming.
Peter the fence is just a 3.00mm piece of flat plate running from the lower engine
cowl side face rearward; a block of triangular shaped foam glued to the skin
would also work for a temporary trial... ending it just forward of the fuel
drain vents will function well; the fence height used in tests is 64.0mm.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=510686#510686
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Message 3
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| Subject: | Re: The Obsidian File - Mono Wheel Fairing |
Lunch has now turned into dinner.. there was a brief hiatus in the weather where
the sun came out and a bunch of bananas were lopped from the tree and many hands
cut off; of bananas, not apes...
So just for entertainment and curiosity the fence concept was extended further
to a more aft limit.. that worked favourably; so the concept was developed into
a rib extending to around 1m short of the stern. And that appears to also work
favourably toward keeping air flowing neatly and quietly downstream to the
undercarriage. A secondary affect if shaped with foam and glassed over would be
added rigidity of the belly skin and less tendency for panel drumming.
Peter the fence is just a 3.00mm piece of flat plate running from the lower engine
cowl side face rearward; a block of triangular shaped foam glued to the skin
would also work for a temporary trial... ending it just forward of the fuel
drain vents will function well; the fence height used in tests is 64.0mm.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=510687#510687
Attachments:
http://forums.matronics.com//files/5c0d4f52_ccdd_4d1f_8991_350b77ff7b8a_102.jpeg
http://forums.matronics.com//files/98ecba07_4c10_4089_84da_feb258ca2f8c_594.jpeg
http://forums.matronics.com//files/1b63a2e1_48ca_45ef_bb09_30c364045798_129.jpeg
http://forums.matronics.com//files/ed982eee_14f5_49fb_8c7a_4ee40a335cb3_159.jpeg
http://forums.matronics.com//files/53c98d9e_97df_42b8_902c_eafa74a11a74_201.jpeg
http://forums.matronics.com//files/c6e645a0_3648_422d_84a1_3e917d0a2aff_142.jpeg
http://forums.matronics.com//files/454164c8_30b1_4232_bdeb_b879e509c25a_414.jpeg
http://forums.matronics.com//files/262db7ea_dbc7_4de8_962d_22427748f1dd_171.jpeg
Message 4
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| Subject: | The Obsidian Files - Doorly Departed |
Have been looking forward to this one...
The outcome was disappointing.. was expecting wind in the cockpit; and thats all
that really happened...
Drag went up 25kg at 100kt for a twin door departation and 17kg for a single door
scenario... on both events the wind came into the cockpit!! It swirled around
and down into the footwells and rear luggage wells, where it swirled around
some more before shooting out straight up at the human head like an upper cut
from both front an rear directions before flying out and over the rear of the
door frame... Anything left loose in the cockpit is getting sucked up and is
going out an opening after slapping the occupants in the head.. for a dual door
situation the swirl remains left and right sided; leaning one's head to the
centre and back may find a pool of calmness... A single door situation is more
exciting; the swirl comes up to the opening on a diagonal from the opposite side
hitting the human closest to the opening in the head from the front and rear
on the way out; anything left loose in the luggage well, shelf, footwell is
going out the opening after slapping the occupant in the face; the occupant can
be human dog or cat... a small dog like chihuahua is probably going out the
opening... a loose ipad; out the opening... and that's about it..
The aircraft is flyable without one or both doors but it won't be very pleasant
at all with 25-30kt winds swirling around like tornado....
Maybe some deflectors will improve a doorless situation...
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=510689#510689
Attachments:
http://forums.matronics.com//files/29147814_5dc4_4c17_8ddf_9be761ece51c_137.jpeg
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http://forums.matronics.com//files/073d78e2_bbb3_4d31_a543_0c335e5ab1f7_419.jpeg
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Message 5
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| Subject: | Re: The Obsidian Files - Doorly Departed |
Interestingly my colombian friend whose door opened in flight reported the
very same thing. His pax grabbed and partially closed the door.
He was worried that the cover would exit the door and wrap round the
tail...In the attempt to catch the cover his passenger let go of the door
handle and away went the door.
They did catch the cover tho.
William Daniell
+1 786 878 0246
On Mon, Apr 24, 2023, 20:14 Area-51 <goldsteinindustrial@gmail.com> wrote:
> goldsteinindustrial@gmail.com>
>
> Have been looking forward to this one...
>
> The outcome was disappointing.. was expecting wind in the cockpit; and
> thats all that really happened... =F0=9F=A4=B7=F0=9F=8F=BC=8D=99
=82=EF=B8=8F
>
> Drag went up 25kg at 100kt for a twin door departation and 17kg for a
> single door scenario... on both events the wind came into the cockpit!! I
t
> swirled around and down into the footwells and rear luggage wells, where
it
> swirled around some more before shooting out straight up at the human hea
d
> like an upper cut from both front an rear directions before flying out an
d
> over the rear of the door frame... Anything left loose in the cockpit is
> getting sucked up and is going out an opening after slapping the occupant
s
> in the head.. for a dual door situation the swirl remains left and right
> sided; leaning one's head to the centre and back may find a pool of
> calmness... A single door situation is more exciting; the swirl comes up
to
> the opening on a diagonal from the opposite side hitting the human closes
t
> to the opening in the head from the front and rear on the way out; anythi
ng
> left loose in the luggage well, shelf, footwell is going out the opening
> after slapping the occupant i!
> n the face; the occupant can be human dog or cat... a small dog like
> chihuahua is probably going out the opening... a loose ipad; out the
> opening... and that's about it..
>
> The aircraft is flyable without one or both doors but it won't be very
> pleasant at all with 25-30kt winds swirling around like tornado....
>
> Maybe some deflectors will improve a doorless situation... =F0=9F=A4=94
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=510689#510689
>
>
> Attachments:
>
>
> http://forums.matronics.com//files/29147814_5dc4_4c17_8ddf_9be761ece51c_1
37.jpeg
>
> http://forums.matronics.com//files/c3da4c4f_6974_4ff6_b83c_8cb5c4011888_1
23.jpeg
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> http://forums.matronics.com//files/073d78e2_bbb3_4d31_a543_0c335e5ab1f7_4
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> http://forums.matronics.com//files/b0ccd426_c7fb_43fd_a0ac_b161dbac545c_6
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> http://forums.matronics.com//files/d941b467_be32_4bb9_b0e8_6c55ccb57f5a_1
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> http://forums.matronics.com//files/6e09ada6_17ba_492d_aa23_e0e7e3013f35_1
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> http://forums.matronics.com//files/dc3b3168_f943_4603_9941_461124ceb381_1
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> http://forums.matronics.com//files/b2c6221a_6d0b_4477_8fef_9572aed30447_2
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> http://forums.matronics.com//files/b2020f6f_ca5f_45ae_b7c3_0598c6c5849b_8
01.jpeg
>
>
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Message 6
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| Subject: | Re: The Obsidian Files - Doorly Departed |
Thanks for the input William... Its amazing how the computer can mathematically
estimate actuals. Something like a cover could wrap around the head very quickly.
I'm not totally finished on this one yet and want to look at how the complete airframe
responds in the 3 axis environment when a door departs.
All analysis so far are just preliminary static tests to identify generated sound
levels and fluid reaction around the component body.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=510691#510691
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