New question to an old topic 4 blade props

Cmount · Post by **Cmount** » Wed Nov 20, 2013 8:54 pm

I am considering having a cup put into the new 4 blade props I put on this season. They are 17X14's. Does anyone have any thoughts how much of a cup I may want? The boat ran well this season, but I feel the props could have been slightly better. They seemed much better than my 16X16 3blades, but again seemed to me I could go a little further on the cup and get a little more out of her at 3100 rpms. I did pick up about 2 knots already at that RPM.

She really comes up to RPM's fast and takes a little to build the speed. No struggle for the engines at all, used to have much more struggle with the 3 blades. Any comments would be appreciated. They head to the shop on Friday.

prowlersfish · Post by **prowlersfish** » Wed Nov 20, 2013 9:09 pm

what rpm are you getting wide open ? What engines do you have .

Cmount · Post by **Cmount** » Wed Nov 20, 2013 9:13 pm

4000 4100 rpm chrysler 318's one is a 1977 and the other s a 1987.

prowlersfish · Post by **prowlersfish** » Wed Nov 20, 2013 9:25 pm

sounds like your right where you should be. Your right at 4000 rpm thats perfict for a 318 . If you add cup then you will drop below the rated rpm . I would leave it alone .

Y

ready123 · Post by **ready123** » Wed Nov 20, 2013 10:31 pm

No cup on mine and they seem to be perfect..... I would not cup yours.

Trojan Boat Forum

New question to an old topic 4 blade props

New question to an old topic 4 blade props

Re: New question to an old topic 4 blade props

Re: New question to an old topic 4 blade props

Re: New question to an old topic 4 blade props

Re: New question to an old topic 4 blade props