AIRFOILS FOR STUNT FLIGHTS

Abstract

The invention relates to airfoils, called jn1431-265 and 1413-362, which operate intelligently by adjusting the variable aerodynamics thereof, not only through the attack and sine angle, but also through the effect of scale (air speed), which, when combined, improve the efficiency of the wings configured therewith by up to 30%, cause the wings to experience a predictable stall and also rapidly recover therefrom, and also making the wings configured therewith more efficient at low speed, which reduces the need to use flaps or slats (“high lift devices”), and, in the event that flaps or slats are used, increase the effect of said airfoils even more. On the other hand, at an increased speed, the aerodynamic variables also adjust by up to a third of the value thereof (the angle of attack remaining unchanged), causing the wing to also be very stable at high speed conditions.

Claims

1. One airfoil kit jn1431-265 will be used for the wing root characterized because it is substantially defined by the coordinates: TABLE-US-00003 x/c y/c 1.00000 0.00000 0.93208 0.01735 0.86931 0.03162 0.81110 0.04326 0.75688 0.05274 0.70609 0.06050 0.65816 0.06700 0.61252 0.07269 056862 0.07799 0.52612 0.08296 0.48480 0.08744 0.44444 0.09132 0.40479 0.09445 036565 0.09669 0.32678 0.09790 0.28797 0.09796 0.24942 0.09678 0.21171 0.09436 0.17546 0.09069 0.14128 0.08574 0.10977 0.07951 0.08155 0.07198 0.05722 0.06316 0.03716 0.05320 0.02128 0.04262 0.00946 0.03199 0.00155 0.02185 −0.00257 0.01277 −0.00305 0.00530 0.00000 0.00000 0.00093 −0.00350 0.00392 −0.00748 0.00929 −0.01180 0.01735 −0.01630 0.02843 −0.02084 0.04284 −0.02526 0.6090 −0.02941 0.08287 −0.03316 0.10851 −0.03643 0.13736 −0.03922 0.16892 −0.04150 0.20271 −0.04325 0.23825 −0.04445 0.27506 −0.04508 0.31266 −0.04513 0.35071 −0.04463 0.38901 −0.04368 0.42735 −0.04235 0.46555 −0.04074 0.50340 −0.03894 0.54070 −0.03704 0.57728 −0.03513 0.61394 −0.03316 0.65348 −0.03078 0.69893 −0.02764 0.75328 −0.02336 0.81957 −0.01757 0.90080 −0.00990 1.00000 0.00000

2. One airfoil jn1431-265 (sic) used for configuring the wing's end characterized because it is substantially defined by the defined coordinates: TABLE-US-00004 x/c y/c 1.0000 0.0000 0.9430 0.0175 0.8865 0.0323 0.8308 0.0447 0.7762 0.0552 0.7231 0.0640 0.6718 0.0716 0.6226 0.0783 0.5758 0.0846 0.5313 0.0904 0.4886 0.0955 0.4475 0.0999 0.4075 0.1033 0.3682 0.1057 0.3293 0.1068 0.2904 0.1067 0.2517 0.1051 0.2138 0.1020 0.1773 0.0977 0.1430 0.0919 0.1114 0.0848 0.0831 0.0763 0.0590 0.0665 0.0392 0.0557 0.0237 0.0442 0.0121 0.0325 0.0042 0.0221 −0.0003 0.0127 −0.0016 0.0051 0.0000 0.0000 0.0010 −0.0034 0.0041 −0.0071 0.0097 −0.0110 0.0180 −0.0149 0.0293 −0.0187 0.0439 −0.0222 0.0620 −0.0253 0.0840 −0.0280 0.1096 −0.0301 0.1383 −0.0317 0.1696 −0.0329 0.2032 −0.0338 0.2385 −0.0343 0.2752 −0.0345 0.3126 −0.0345 0.3506 −0.0343 0.3889 −0.0340 0.4272 −0.0335 0.4655 −0.0330 0.5035 −0.0324 0.5410 −0.0318 0.5778 −0.0313 0.6147 −0.0306 0.6545 −0.0294 0.7001 −0.0273 0.7544 −0.0237 0.8206 −0.0183 0.9014 −0.0105 1.0000 0.0000

3. Airfoils jn1431-265 and 1413-362 which operate intelligently by adjusting their variable aerodynamics, not only by the angle of attack, but also by the scale effect (speed) characterized because

4. Airfoils jn1431-265 and 1413-362, according to claim 1, when combined improve the efficiency of the wings configured therewith by up to 30%

5. Airfoils jn1431-265 and 1413-362, according to claims 1 and 2, characterized because when combined cause the wing configured therewith to experience a predictable stall as well as a quick recovery therefrom.

6. Airfoils jn1431-265 and jn1413-362, according to claims 1 and 2, characterized because they make wings configured therewith more efficient at low speed, reducing the need to use flaps or slats (“high lift devices”), and, in case they are used, their effect increases even more. On the other hand, as the speed increases the aerodynamic variables adjust by up to a third of the value thereof (with the same angle of attack), causing the wing to also be very stable at this high-speed condition.

7. Airfoil jn1431-265, in accordance with claim 1, characterized because it is 14.31% wide in relation to its length.

8. Airfoil jn1413-362, in accordance with claim 2, characterized because it is 13% wide in relation to its length.

9. Airfoil jn1431-265, in accordance with claim 1, characterized because it has a camber of 2.65.

10. Airfoil jn1413-362, in accordance with claim 2, characterized because it has a camber of 3.62.

Description

BRIEF DESCRIPTION OF FIGURES

[0004] FIG. 1 is a view of airfoil jn1431-265 which will be used for the wing root because it has the lowest lift coefficient and allows for the most stable stall.

[0005] FIG. 2 is a view of airfoil jn1413-362 which will be used for configuring the wing's end and this way make up the combination with the wing root's airfoil jn1431-265 in order to allow for the aforementioned characteristics of the wing's performance.

[0006] FIG. 3 shows the lift coefficient (cl) at different angles of attack (alpha) and using different scale effects (re) of airfoil jn1431-265.

[0007] FIG. 4 shows the lift coefficient (cl) at different angles of attack (alpha) and using different scale effects (re) of airfoil jn1413-362.

[0008] FIG. 5 shows the lift coefficient (cl) at different angles of attack (alpha) and using different scale effects (re) of Dr. Seilig's airfoil s8037 which is included for comparison purposes.

[0009] FIG. 6 shows the different polar graphs for airfoil jn1431-265.

[0010] FIG. 7 shows the different polar graphs for airfoil jn1413-362.

DETAILED DESCRIPTION OF THE INVENTION

[0011] Airfoils jn1432-265 (sic) and jn1413-362, as shown in FIGS. 1 and 2, were designed to be used in the construction of general aviation. wings. During the initial phase the design of the upper and lower curves of each airfoil were worked on in order to obtain the highest possible lift coefficient (cl) from is each airfoil section without increasing the camber too much to prevent sacrificing inverted flight, the lift coefficient (cl) differential was also considered between airfoil jn1432-265 (sic) and airfoil jn1413-365 in order to have a more predictable stall. When analyzing the scale effect we found that the different curves when going through angles between 0 and +1 (taking into account that the angle of incidence in which the wing normally flies is within this range) of the graphs the lift coefficient is highest when the Reynolds number is lowest and inversely it decreases as the Reynolds number increases this translates into the fact that as the Reynolds number increases the coefficient adjusts to each flight condition, then the coefficient is high at slow speeds allowing for short, predictable and safer takeoffs and landings, and on the other extreme, the coefficient decreases as the speed increases which allows for stability in this other flight condition, allowing for more flexibility in different flight conditions and it has also been observed that UAVs that have been configured with these wings for testing have a better performance in conditions with increased winds as compared to aircraft that have been configured with other airfoils. Also the drag coefficient (cd) which in itself is low in the highest values of the lift coefficient (cl) also descends to values up to one third of the initial value as the Reynolds number increases.
The following table contains the coordinates of airfoil jn1431-265 which will be used for the wing root because it has the lowest lift coefficient and allows for the most stable stall.

TABLE-US-00001 jn1431-265 x/c y/c 1.00000 0.00000 0.93208 0.01735 0.86931 0.03162 0.81110 0.04326 0.75688 0.05274 0.70609 0.06050 0.65816 0.06700 0.61252 0.07269 0.56862 0.07799 0.52612 0.08296 0.48480 0.08744 0.44444 0.09132 0.40479 0.09445 0.36565 0.09669 0.32678 0.09790 0.28797 0.09796 0.24942 0.9678 0.21171 0.09436 0.17546 0.09069 0.14128 0.08574 0.10977 0.07951 0.08155 0.07198 0.05722 0.06316 0.03716 0.05320 0.02128 0.04262 0.00946 0.03199 0.00155 0.02185 −0.00257 0.01277 −0.00305 0.00530 0.00000 0.00000 0.00093 −0.00350 0.00392 −0.00748 0.00929 −0.01180 0.01735 −0.01630 0.02843 −0.02084 0.04284 −0.02526 0.06090 −0.02941 0.08287 −0.03316 0.10851 −0.03643 0.13736 −0.03922 0.16892 −0.04150 0.20271 −0.04325 0.23825 −0.04445 0.27506 −0.04508 0.31266 −0.04513 0.35071 −0.04463 0.38901 −0.04368 0.42735 −0.04235 0.46555 −0.04074 0.50340 −0.03894 0.54070 −0.03704 0.57728 −0.03513 0.61394 −0.03316 0.65348 −0.03078 0.69893 −0.02764 0.75328 −0.02336 0.81957 −0.01757 0.90080 −0.00990 1.00000 0.00000
Airfoil jn1413-362 will be used for configuring the wing's end and this way make up the combination with the wing root's airfoil jn1431-265 in order to allow for the aforementioned characteristics of the wing's performance. The following table contains the coordinates of airfoil jn1413-362.

TABLE-US-00002 x/c y/c 1.0000 0.0000 0.9430 0.0175 0.8865 0.0323 0.8308 0.0447 0.7762 0.0552 0.7231 0.0640 0.6718 0.0716 0.6226 0.0783 0.5758 0.0846 0.5313 0.0904 0.4886 0.0955 0.4475 0.0999 0.4075 0.1033 0.3682 0.1057 0.3293 0.1068 0.2904 0.1067 0.2517 0.1051 0.2138 0.1020 0.1773 0.0977 0.1430 0.0919 0.1114 0.0848 0.0831 0.0763 0.0590 0.0665 0.0392 0.0557 0.0237 0.0442 0.0121 0.0325 0.0042 0.0221 −0.0003 0.0127 −0.0016 0.0051 0.0000 0.0000 0.0010 −0.0034 0.0041 −0.0071 0.0097 −0.0110 0.0180 −0.0149 0.0293 −0.0187 0.0439 −0.0222 0.0620 −0.0253 0.0840 −0.0280 0.1096 −0.0301 0.1383 −0.0317 0.1696 −0.0329 0.2032 −0.0338 0.2385 −0.0343 0.2752 −0.0345 0.3126 −0.0345 0.3506 −0.0343 0.3889 −0.0340 0.4272 −0.0335 0.4655 −0.0330 0.5035 −0.0324 0.5410 −0.0318 0.5778 −0.0313 0.6147 −0.0306 0.6545 −0.0294 0.7001 −0.0273 0.7544 −0.0237 0.8206 −0.0183 0.9014 −0.0105 1.0000 0.0000
Airfoil jn1431-265 is 14.31% wide in relation to its length. And airfoil jn1413-362 is 14.13% wide in relation to its length. Airfoil jn1431-265 has a camber of 2.65 and airfoil jn1413-362 has a camber of 3.62.
Airfoils jn1431-265 and 1413-362 work operate intelligently by adjusting their variable aerodynamics, not only by the angle of attack, but also by the scale effect (speed), as shown in FIGS. 3 and 4. When combined, these airfoils improve the efficiency of the wings configured therewith by up to 30%. They also cause the wing to experience a predictable stall as well as a quick recovery therefrom. Additionally, they are more efficient at low speed, reducing the need to use flaps or slats (“high lift devices”), and, in case they are used, their effect increases even more. FIG. 5 shows the lift coefficient (cl) at different angles of attack (alpha) and using different scale effects (re) of Dr. Seilig's airfoil s8037 which is included for comparison purposes.
On the other hand, as the speed increases the aerodynamic variables adjust by up to a third of the value thereof (with the same angle of attack), causing the. wing to also be very stable at this high-speed condition. FIGS. 6 and 7 show is the different polar graphics for airfoils jn1431-265 and jn1413-362, respectively.