Thanks, Chris. The possibility of decreasing drag and increasing speed
has led a lot of Swift owners to consider closing the slots, but, from
what I have read, no one has reported on that single modification
alone. They all go ahead and increase horsepower and streamline the
cowl at the same time. As I mentioned earlier, most "experts" feel
that, unless one has raised the speed considerably, there is likely to
be little speed recovered from removing the slots. These same folks
didn't report much difference in stall characteristics, either, but I
find that hard to swallow.
Jim Nichols
Tullahoma, TN USA
On 8/11/2015 2:42 PM, ChrisB wrote:
Those are lovely aircraft, Jim; thanks for showing them to us.
I should have thought that there would be some drag from the slots, but I
accept your opinion.
Chris
On 11 Aug 15, at 19:31, Jim Nichols <jhnichols@xxxxxxxxxxxxx> wrote:
A flight of three beautiful Swift aircraft visited our airport this morning.
http://www.gallery.leica-users.org/v/OldNick/Swifts.jpg.html
<http://www.gallery.leica-users.org/v/OldNick/Swifts.jpg.html>
These all had different modifications. Each had larger engines. All had the
original control wheels replaced by fighter-like control sticks. This one was
closest to the original appearance, polished aluminum.
http://www.gallery.leica-users.org/v/OldNick/Polished+Swift.jpg.html
<http://www.gallery.leica-users.org/v/OldNick/Polished+Swift.jpg.html>
It was the only one that had the window left open for a panel shot.
http://www.gallery.leica-users.org/v/OldNick/Swift+Panel.jpg.html
<http://www.gallery.leica-users.org/v/OldNick/Swift+Panel.jpg.html>
It also had the original leading edge slot to maintain better flow over the
ailerons at low speeds.
http://www.gallery.leica-users.org/v/OldNick/Slots+Open.jpg.html
<http://www.gallery.leica-users.org/v/OldNick/Slots+Open.jpg.html>
The red Swift had the slots closed. The Swift has long led to a lot of hangar
talk about these slots. Most agree that there is not much speed to be gained
by closing them unless a lot of horsepower has been added, resulting in speeds
above 170 mph. Everyone seems to hold to his own opinion about how closing the
slots affects stall characteristics.
http://www.gallery.leica-users.org/v/OldNick/Slots+Closed.jpg.html
<http://www.gallery.leica-users.org/v/OldNick/Slots+Closed.jpg.html>
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