kort nozzel?

[dnchvs]

i have a 44 inch tug and a 3.5 inch prop from prop shop
shoud i use a kort or not...i heard it could actuall hurt the performance of the tug...the prop blades are rounded at the ends and it has a 4 inch pitch
also do you think this prop is big enough for a tug to tow
the hull is simular to a douglas greg and wheigs 38 lbs

[woodybob]

From what I understand, a set up like this, http://static.rcgroups.com/forums/attachments/1/5/8/6/9/4/t2077750-155-thumb-INS_0013.jpg (http://www.rcgroups.com/forums/attachment.php?attachmentid=2077750) works better than a Kort. Big old prop with a pair of rudders.

[keith S]

It all depends on the style and type of tug. It will enhance certain capabilities, but negatively hurt others. What type hull are you doing?

[dnchvs]

like a san pedro or a douglas greg 1 prop

[toesup]

A properly fitted (close fitting) Kort can increase the tug's towing performance and increase its bollard pull considerably over an 'ordinary' prop and rudder.
http://en.wikipedia.org/wiki/Kort_nozzle

Round ended blades are not the best when it comes to fitting inside a kort, it will however still increase the bollard pull of the tug. You will find steering is also improved and possibly reversing.

[steamboatmodel]

I have matched Korts and props by very carefully trimming a larger prop down in the lathe to fit the Korts. You must take very light cuts or the prop blades fold up.
Regards,
Gerald