Props for Fairline 40 with twin Detroit 400HP engines

[Hans]

Hi guys,<br /><br />Got this boat recently and found it virtually planes instantly but - at 3800 rpm's (should be 2600 with these engines?) - shakes something awful. Am told I need 4-blade propellers with increased pitch. I do want the speed (30knots). Any suggestions and recommendation for right props would be appreciated.<br /><br />Thanks in advance.<br />Hans zwyer2@rad.net.id

 

[Bob_VT]

Re: Props for Fairline 40 with twin Detroit 400HP engines

There are props available on Iboats and a whole bunch of prop dealers out there. http://www.chadhillpropellers.com/ is a good one to check. I would also check to see if what you have now is in balance. <br />You might want to post a bit more info such as drive type (inboard or IO) and size and weight of boat.<br /><br />Detroits are renowned for the noise they make!!<br /><br /> http://www.ballisticprops.com/ <br /><br /> http://www.simplicity-marine.com/surfprop.htm has a good article listed about vibration too.<br /><br />Bob

 

[DJ]

Re: Props for Fairline 40 with twin Detroit 400HP engines

YIKES!!!!!!!!!!!!<br /><br />3600! on a DETROIT!!. Make sure everyone runs parallel to the crankshafts!!<br /><br />Not sure what D's you have, but; 1. You are either grossly overpowered. 2. You're tach's are wrong. Don't discount # 2. Detroits sound alot faster than they are actually turning.