The design of the Met-Co-Tips comes directly
from the research of Dr. Sighard Hoerner, Ph.D., a prominent
involved in designing a high performance wing tip for use on
Navy fighter planes. His technical data and conclusions were
compiled at Wright-Paterson Field and published in USAF Technical
Report #5752. Met-Co-Aire applied his work to civilian aircraft.
AN EFFICIENT WING TIP-WHAT'S NEEDED?
Dr. Hoerner showed that the efficiency of a wing tip depends
on six critical areas. His findings were:
1. The tip must be as thin as possible but
still maintain a round leading edge.
2. A blending of wing top and bottom surfaces along a straight
3. The edge formed at this blend to be as thin as possible.
4. Obtain a sharp trailing edge leading to a corner, this corner
to be in a straight a line as possible with the entire wing
5. The top of the tip to remain in a level plane with the top of the wing.
6. The bottom plane to be brought up in a convex curve.
The primary reasons for this design are as
follows: A square wing tip gives the greatest wing area for
the least span. A smoothly
finished, thin, leading edge provides for the best possible
airflow over the tip. The convex underside accelerates the
speed of the
air passing under the tip to a velocity more equal to that
of the air flowing over the top of the tip, thereby creating
flow. This flow reduces turbulence, which markedly decreases
the size and intensity of tip vortices. By having a deep, straight
trailing edge we are moving the point at which the vortex begins
away from and behind the main surface of the wing, which means
less drag and better control. By keeping the outermost point
of the wing in a level plane with the wing top surface, we
effectively increase wing dihedral angles. (Gain lateral
WHAT'S ALL THIS MEAN?
Quite simply, your wing has a finite length,
that is, it has ends (tips). The air flowing under the wing
will seek the
region of low pressure above the wing by "spilling over" these
ends. This spillage creates vortices or regions of turbulence
which roll inboard and backward at the tips. The vortices absorb
energy and increase drag, also since they roll directly over
the ailerons they hamper stability and handling. From elementary
physics we know if we can reduce the magnitude of these vortices,
the plane will have more energy available to pull itself through
the air. Also, if we redirect the position of the vortices
away from the ailerons we will gain stability and control.
exactly what we have done with Met-Co-Tips!
As you can see from the pictures on our web
site, Met-Co-Tips meet all the design criteria of the Hoerner
MET-CO-TIPS-THE BEST TIPS AVAILABLE FOR YOUR AIRPLANE
The final test of any design is how well it performs on the
aircraft. In light of the figures below, it can be seen that
Met-Co, Hoerner design wing tips will definitely add to the performance
of your aircraft. Met-Co-Tips will:
• Increase range 1-2% at
no additional fuel cost!
• Increase rate of climb by 60 feet per minute!
• Increase cruising speed by 3-5 mph!
• Reduce distance required for take off, resulting in a 10-20%
quicker take off!
mph lower stall speed with more positive aileron control!
• Increase the overall stability of the aircraft!
• Improved appearance with a more aerodynamic profile!
The Hoerner design, agreed to be the best wing tip design available.