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Author Topic: twin rudder alignment  (Read 1410 times)

April 17, 2011, 08:32:00 PM
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takeoff29

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twin rudder alignment
« on: April 17, 2011, 08:32:00 PM »
looking for info for  twin rudder alignment on a 29 aquasport  .Should rudders be parallel or toe in or toe out and how much toe should they have .Boat has twin crusader 320hp engines, thanks  , Jeff      :D

April 18, 2011, 03:13:59 PM
Reply #1

takeoff29

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Re: twin rudder alignment
« Reply #1 on: April 18, 2011, 03:13:59 PM »
still looking for any info thanks

April 18, 2011, 04:01:15 PM
Reply #2

fitz73222

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Re: twin rudder alignment
« Reply #2 on: April 18, 2011, 04:01:15 PM »
I can point you towards twin outboard toe in or toe out; but thats probably apples and oranges. I've never seen anyone adjust rudder toe on inboard twins, but it is logical to think its just as important.
1973 Aquasport 22-2, twin 115 Mercs
2000 Baycraft 175 flats boat, 60 Bigfoot Merc
1968 Boston Whaler 13, 25 Yamaha (project)
1966 Orlando Clipper 13, 9.9 Merc

April 18, 2011, 04:11:54 PM
Reply #3

pete

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Re: twin rudder alignment
« Reply #3 on: April 18, 2011, 04:11:54 PM »
http://forum.woodenboat.com/archive/ind ... 93195.html

here is some info on the subject,they say to have them parralell,I would call a good prop shop, good luck :salut:
2003  Osprey 225
Palm Bay FL

April 18, 2011, 09:10:14 PM
Reply #4

seabob4

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Re: twin rudder alignment
« Reply #4 on: April 18, 2011, 09:10:14 PM »
1/2" toe in.  In other words, if the spread at the leading edge is 48", the spread at the trailing edge should be 48 1/2".  But, as with all boats, every one is different.  You really have to play with things to get it set up for your boat...


Corner of 520 and A1A...

April 18, 2011, 09:46:42 PM
Reply #5

takeoff29

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Re: twin rudder alignment
« Reply #5 on: April 18, 2011, 09:46:42 PM »
seabob4 when you say play with different things to get set up for my boat what sort of things should i look for ?. and when will i know i have the right set up?

April 18, 2011, 11:07:59 PM
Reply #6

seabob4

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Re: twin rudder alignment
« Reply #6 on: April 18, 2011, 11:07:59 PM »
Quote from: "takeoff29"
seabob4 when you say play with different things to get set up for my boat what sort of things should i look for ?. and when will i know i have the right set up?

There are a number of variables when it comes to setting up your boat for maximum efficiency, whether it be cruise speed, MPG, WOT, manueverability, whatever.  So basically, since we don't have the specs anymore from the time when your 29 was built, you just have to play with things.  Start at no toe, in or out.  See what you think, check your numbers.  If you're happy, leave it at that.  If not, go to a little toe-in, repeat the tests.  If the results are better, stick with that, if not, go to a little toe-out.  See what happens to the numbers...and, of course, the handling.  Hardover at speed and low speed maneuvering around the dock.

Eventually, you'll find the happy medium that suits all your needs...but you gotta play with things...

And then there are props!!! :shock:  :shock:


Corner of 520 and A1A...

April 19, 2011, 03:44:10 PM
Reply #7

takeoff29

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Re: twin rudder alignment
« Reply #7 on: April 19, 2011, 03:44:10 PM »
thanks seabob4 i will go that direction with the rudders ,my props were tuned for max speed to fuel used on the boat and that is 22knots at 3200 rpms the person that did them took me out for test runs to explain to me what he was doing and the starboard prop needed a slight more cup than the port side did .he tuned the props for wide open throttle to engine specs. for rpm  thank you for the info .

 

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