Paul, here are the plot points for the STOCK RV-4 cowl. The stock cowl
has a thrust line that is perpendicular to the firewall, on the
centerline, 12.25 inches from the top of the firewall. The spinner is 12
inches in diameter. The face of the prop mount flange is 38 inches in
front of the firewall. If you need any more information, I might be able
to have the cowl plan scanned onto a disc. Let me know.

Brian Trubee

0                    12.15
1                    12.39
2                    12.54
3                    12.63
4                    12.67
5                    12.7
6                    12.72
7                    12.73
8                    12.75
9                    12.76
10                12.76
11                12.75
12                12.74
13                12.73
14                12.72
15                12.71
16                12.7
17                12.68
18                12.63
19                12.57
20                12.5
21                12.38
22                12.17
23                11.8
24                11.27
25                10.52
26                9.5
27                8.12
28                6.23
28.5     4.95
29                2.82
29.13         0

Thanks Brian. I'll add this to my cowl data base.

Paul Lamar ...No rotor no motor.

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