wing levelers

When I said "I think" I was very humble...

Regarding winglets I am an "expert" (definition of an expert is someone that
have read what other have don :-)
Peter Masak did a great pioneer work on effective winglets. result was
winglets that didn't decrease performance at high speed as the large earlier
winglets.

Winglets make the wing act like it was of greater span, the improvement is
larger then if the wing was lengthened the amount of the winglets height.
And the increase in bending moment is smaller then the longer wing will
produce.

Winglets and longer wings reduce the induced drag (that come from the work
of producing lift) that work is harder at low indicated speed, =slow speed
at low altitude, low indicated speed at high altitude and getting there.

So even an "high speed" jetliner will be helped by using winglets, it spend
a long time at high weight climbing to economical cruising altitude, there
it cruise at low indicated speed (what pilot see) or more correct low
dynamic pressure.

Ok, no one here on RAH build jet liner, some fly them, and some build high
performance aeroplanes that have the capability to cruise at high altitude,
other aeroplanes can benefit from improvements of winglets too, if you fly
very long distances and want most economic, you would like to cruise near
(high side of) speed for best L/D ( at alt it will still go fast) here
winglets will help a lot.
other situations is to improve take off and climb and roll stability AND
roll rate, better aileron efficiency.

In this case Dick want more stability on a ? small big M ? plane, with
winglets he get a wing that "think" that the dihedral is grater then it is,
and improve the short wings low speed performance. don correct it would not
hurt cruise performance.

Jan in ME
www.jcpropellerdesign.com
Propeller and Performance software


"Morgans" skrev i meddelandet
...

"Jan Carlsson" wrote in message
...
Dick,

I think that winglets would improve roll stability, and L/D, climb
performance and high alt. performance.

Jan Carlsson

At the speeds we fly, winglets do little to nothing. They only become
useful at higher speeds.
--
Jim in NC

"Jan Carlsson" wrote in message

When I said "I think" I was very humble...

I also attempt to be humble. You can always find someone smarter, or
bigger, or stronger or ..... than yourself.

Regarding winglets I am an "expert" (definition of an expert is someone
that
have read what other have don :-)

Perhaps I have more reading to do.

Peter Masak did a great pioneer work on effective winglets. result was
winglets that didn't decrease performance at high speed as the large
earlier
winglets.

Winglets make the wing act like it was of greater span,

This I know.

the improvement is
larger then if the wing was lengthened the amount of the winglets height.
And the increase in bending moment is smaller then the longer wing will
produce.

This I did not know.

Winglets and longer wings reduce the induced drag (that come from the work
of producing lift) that work is harder at low indicated speed, =slow speed
at low altitude, low indicated speed at high altitude and getting there.

So even an "high speed" jetliner will be helped by using winglets, it
spend
a long time at high weight climbing to economical cruising altitude, there
it cruise at low indicated speed (what pilot see) or more correct low
dynamic pressure.

Do you have any suggestions that I could do some more reading? I hate it
when I am wrong! :-)
--
Jim in NC

My humour doesn't always come to its right in English not even Swedish. Some
people recognise it as humor. :-)

There was an article by Peter Masak on the net some years ago, I have saved
it on the puter at my office.

As an Captain you can always ref. to §1= Captain is always right. or
§2=if Captain is wrong, §1 is what rules. (not a good one in a plane)

Jan
www.jcpropellerdesign.com


"Morgans" skrev i meddelandet
...

"Jan Carlsson" wrote in message

When I said "I think" I was very humble...

I also attempt to be humble. You can always find someone smarter, or
bigger, or stronger or ..... than yourself.

Regarding winglets I am an "expert" (definition of an expert is someone
that
have read what other have don :-)

Perhaps I have more reading to do.

Peter Masak did a great pioneer work on effective winglets. result was
winglets that didn't decrease performance at high speed as the large
earlier
winglets.

Winglets make the wing act like it was of greater span,

This I know.

the improvement is
larger then if the wing was lengthened the amount of the winglets
height.
And the increase in bending moment is smaller then the longer wing will
produce.

This I did not know.

Winglets and longer wings reduce the induced drag (that come from the
work
of producing lift) that work is harder at low indicated speed, =slow
speed
at low altitude, low indicated speed at high altitude and getting there.

So even an "high speed" jetliner will be helped by using winglets, it
spend
a long time at high weight climbing to economical cruising altitude,
there
it cruise at low indicated speed (what pilot see) or more correct low
dynamic pressure.

Do you have any suggestions that I could do some more reading? I hate it
when I am wrong! :-)
--
Jim in NC

Jim,

In addition the to article I mentioned earlier,
http://www.soaridaho.com/Schreder/Te...lets/Masak.htm, take a look
at the series posted on
http://www.soaridaho.com/Schreder/Te...ts/PSU_Ref.htm

Wayne
http://www.soaridaho.com/Schreder


"Morgans" wrote in message
...


Do you have any suggestions that I could do some more reading? I hate it
when I am wrong! :-)
--
Jim in NC

Morgans wrote:


Do you have any suggestions that I could do some more reading? I hate it
when I am wrong! :-)

I thought I was wrong once, But I was mistaken!.
John