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C75 props
C75 props
21 Jan 2016 14:39 #1
by Super User
Or, as was pointed out, have a look at the data plate on the engine. On every Continental I've ever seen they're on the top of the case about halfway from front to back on the case. On my C-90, it's on the passenger side. On my 182's O-520, it's on the pilot side.
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21 Jan 2016 14:35 #2
by Larry Snyder
You are correct, sir! I forgot about that, since most of the C75s I've seen had 73 inch props. So the prop diameter, unfortunately, doesn't tell this person anything. Log books are a must!
Larry
N99340
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29 Dec 2015 07:58 #3
by Randy Hirsch AP
A 71-50 per the Type Certificate is fine for a C-75.
2. Propeller - fixed pitch metal, McCauley 1A90CF or 1B90CM 26 lb. (-32)
(a) With Continental C-75 series engines only
Static r.p.m. at maximum permissible throttle setting:
not over 2100, not under 1950. No additional tolerance permitted.
Diameter: not over 73 in., not under 71 in.
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28 Dec 2015 11:38 #4
by Larry Snyder
With Ercoupe, you can't assume anything. If it has been upgraded to a C85 there should be an extra data plate on the engine stating such. Logbooks are important and should contain an entry. If it's still a 75, that prop is illegal.
Larry
N99340
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28 Dec 2015 11:11 - 28 Dec 2015 11:11 #5
by TahoeTim
I am looking at an Ercoupe to purchase. It has a 71-50 McCauley prop on it so can I assume that it has been up rated to a C85? It seems like all the data suggests that the C75 had the 73 inch prop.
Last edit: 28 Dec 2015 11:11 by TahoeTim.
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