Mitsubishi B-9 airfoil aka Blackburn B-9 airfoil seems to have been adopted by many Mitsubishi planes like B2M, G3M, Ki-15 and Ki-51.
Max wing thickness is known 16%.
If this G3M drawing is correct, position looks 30%.
Leading edge shape on German fighter aircraft?
- Thread starter spicmart
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Max wing thickness is known 16%.
If this G3M drawing is correct, position looks 30%.
Aeroweanie
Airman
- 76
- Jan 17, 2021
Excellent - thank you!!
Aeroweanie
Airman
- 76
- Jan 17, 2021
I only traced the drawing
0 0
1.25 2.055
2.5 3.115
5 4.735
10 7.010
20 9.255
30 9.935
40 9.710
50 8.925
60 7.735
70 6.195
80 4.375
90 2.320
100 0
90 -1.345
80 -2.520
70 -3.570
60 -4.510
50 -5.345
40 -5.955
30 -6.220
20 -6.020
10 -4.980
5 -3.855
2.5 -2.895
1.25 -2.125
0 0
Aeroweanie
Airman
- 76
- Jan 17, 2021
I only traced the drawing
0 0
1.25 2.055
2.5 3.115
5 4.735
10 7.010
20 9.255
30 9.935
40 9.710
50 8.925
60 7.735
70 6.195
80 4.375
90 2.320
100 0
90 -1.345
80 -2.520
70 -3.570
60 -4.510
50 -5.345
40 -5.955
30 -6.220
20 -6.020
10 -4.980
5 -3.855
2.5 -2.895
1.25 -2.125
0 0
Thank you!
Aeroweanie
Airman
- 76
- Jan 17, 2021
This is interesting. If I take the A6M2 wing root airfoil (the MAC118) and scale it from 14.24% thickness to 17.11% thickness and scale the camber from 1.846% to 2.112%, I get a pretty close overlay with the Blackburn B-9 airfoil!
Was it really that thick at the root?
Comparing this to the 23015 that is sometimes given for the zero provides a poor match;
A 15014 gives the best 5-digit match I could manage;
But a 2314 looks closer still. Maybe the sources that say 23015 mistook a 4-digit for a 5?
Comparing this to the 23015 that is sometimes given for the zero provides a poor match;
A 15014 gives the best 5-digit match I could manage;
But a 2314 looks closer still. Maybe the sources that say 23015 mistook a 4-digit for a 5?
Aeroweanie
Airman
- 76
- Jan 17, 2021
Last edited by a moderator:
The designer for Kawanishi was influenced by Shorts flying boats to modify airfoils.
No codes for them are found so far.
Snautzer01
Honourably banned
- 38,256
- Mar 26, 2007
?
Was there co operation between Short and Japan?
Yes, they had
Snautzer01
Honourably banned
- 38,256
- Mar 26, 2007
Ahh the spying game. The un wanted co operation game.
Thievery is i think not co operation but all sides did I suppose. Still do. No shame in that.
Thievery is i think not co operation but all sides did I suppose. Still do. No shame in that.
Aeroweanie
Airman
- 76
- Jan 17, 2021
To add to that...
Kawanishi H3K - Wikipedia
Mitsubishi B2M - Wikipedia
The connection between the British Royal Navy and the Japanese was long standing, the only surviving pre dreadnought battleship in the world was built by the British at Barrow for the Japanese being laid down in 1899. Japanese battleship Mikasa - Wikipedia
I have traced drawings as no more clues.
Kawanishi H6K
0 0
1.25 2.48
2.5 3.43
5 4.74
10 6.63
20 8.91
30 9.69
40 9.81
50 9.23
60 8.11
70 6.56
80 4.69
90 2.50
100 0
90 -1.31
80 -2.61
70 -3.80
60 -4.80
50 -5.58
40 -6.10
30 -6.23
20 -5.90
10 -5.10
5 -3.93
2.5 -2.94
1.25 -2.14
0 0
Kawanishi H8K
0 0
1.25 2.98
2.5 3.97
5 5.35
10 7.23
20 9.48
30 10.69
40 10.96
50 10.37
60 9.17
70 7.44
80 5.33
90 2.86
100 0
90 -0.74
80 -1.72
70 -2.77
60 -3.78
50 -4.69
40 -5.43
30 -5.91
20 -5.94
10 -4.95
5 -3.74
2.5 -2.72
1.25 -1.94
0 0
Aeroweanie
Airman
- 76
- Jan 17, 2021
Wow! Thank you! I'll let you know what I figure out.
Aeroweanie
Airman
- 76
- Jan 17, 2021
Here is what I found:
The Kawanishi H6K root airfoil appears to be a NACA (1.8)516 (a NACA 2416 with camber reduced from 2% to 1.8%)
The Kawanishi H8K root airfoil appears to be a NACA (2.7)516.6 (a NACA 3516 with camber reduced from 3% to 2.7% and thickness increased from 16% to 16.6%)
The Kawanishi H6K root airfoil appears to be a NACA (1.8)516 (a NACA 2416 with camber reduced from 2% to 1.8%)
The Kawanishi H8K root airfoil appears to be a NACA (2.7)516.6 (a NACA 3516 with camber reduced from 3% to 2.7% and thickness increased from 16% to 16.6%)
Good job Sir!
Based on those coordinates, the Mitsubishi 118 is a NACA 250 mean line, with max camber at 25% chord, instead of 15% chord, as with 230 mean line ( see NACA report 537 ). The camber is reduced to 2%, from 2.3% for the standard 250 mean line ( the value of k is about 2.858 vs the standard value of 3.23 ). The NACA designation would be something like 250xx mod
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