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Re: Porpeller data sheet (56D/45P) Neil Jepsen

Neil Jepsen <jepsen@...>
 

Boy oh boy Justin,, at a glance that prop is sure out of balance. For instance, at the 75% mark, one blade has a 45.5" pitch and the
other blade is 56" ! It gets worse as the distance gets out. I don't know how significant these errors are but they would seem so. I'll
go measure one of my props this afternoon, and report back tomorrow.
neil

Robert Justin wrote:

Hope this data is helpful in identifying your RPM problem. Also, if the data dose not display well send me your e-mail address and
I will sent the data to you as a attached speadsheet.

Remarks: Reference starting point is at the propeller center with the first readings being taken at the

7 inch point.
COWLEY PROPELLER DATA






56D/45P





FROM HUB TO TIP 1
ACTUAL
SHOULD BE
ACTUAL
FROM HUB TO TIP 2



IN INCHES
IN DEGREES
IN DEGREES
IN DEGREES
IN INCHES



7
45
45.7
45
7



8
41
41.9
41
8



9
38
38.6
38
9



10
33
35.7
32
10



11
33
33.7
32
11



12
30
31
31
12



13
29
29.6
30
13



14
28
27
30
14



15
27
25
30
15



16
27
24.1
28
16



17
25
22.7
25
17



18
25
21.6
25
18



19
24
20.6
24
19



20
22
19.6
23
20



21
19
18.8
23
21
75% point


22
20
18
22
22



23
19
17.3
22
23



24
20
16.6
22
24



25
19
16
24
25



26
18
15.4
23
26



27
17
14.9
20
27



28
16
14.3
25
28






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