Consider also the gap between the frame/wheel and fuselage opening. That g
ap has to be cut "like Goldilocks" or just right or air swirls around and g
ushes up into the well.
NACA had tests on the partially retracted gear and frankly, a half-buried t
ire is a good compromise. Drag was decreased slightly in the wind tunnel w
ith a narrower gap. In these tests the gap was closed up to the tire and t
he tire gap was as small as practical. Photos are grainy and virtually imp
ossible to find from NASA. Heinkel did work in this area also.
Most 1930-40s aircraft with partially exposed wheels did hide the wheels in
the nacelles or made covers for the gap in the wings back to the tire to c
lean up the gap and reduce drag. Making a flange with rounded edge in the
rear of the wheel well area was also done to clean up the exit and prevent
air pressure buildup in the well. ( As done by Seversky in the P-35) Dougl
ass put the oil cooler on the C-47 just before the tire to cut the drag. C
rude but effective. Bellanca did no streamlining until the Viking series.
Adding a small cover to the front helped, so they made a complete door to
enclose the gear. A full fairing is nice, but the extra weight and complex
ity becomes tedious to complete effectively. Many folks up north simply re
moved the rear door.
See NACA Report 518 for some drag numbers (very crude stuff, drag is in pou
nds, but the tire size is familiar looking) to bounce off your calcs.
Enjoy your computer work. I=92m doing 3D printing stuff and cooling airflo
w and enclosure mods using similar programs. The learning curve was and st
ill is steep. Too many assumptions have to be made to compromise on airflo
w and pressure build up. Yuck. It is a hit and miss (for me anyway) on ge
tting the best airflow bang for the buck and time.
Best Regards,
Bud Yerly
________________________________
From: owner-europa-list-server@matronics.com<mailto:owner-europa-list-serve
r@matronics.com> <owner-europa-list-server@matronics.com<mailto:owner-europ
a-list-server@matronics.com>> on behalf of Area-51 <goldsteinindustrial@gma
il.com<mailto:goldsteinindustrial@gmail.com>>
Sent: Sunday, April 23, 2023 9:25:27 AM
t@matronics.com<mailto:europa-list@matronics.com>>
Subject: Europa-List: Re: The Obsidian File - Mono Wheel Fairing
<mailto:goldsteinindustrial@gmail.com>>
Interesting... probably worth increasing the velocity parameters to 75m/sec
and see what happens =F0=9F=A4=B7=F0=9F=8F=BC=8D=99=82=EF=B8=8F
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