JAG SAW rigger

[lohring]

Note the pictures of the JAG rigger in the gallery http://www.intlwaters.com/index.php?app=gallery&module=images&section=viewimage&img=6649 There are several important features, some that don't show up well. The weight is quite far back, but there is a rear wing to lift the stern. Because this wing is in ground effect, it looses lift very quickly as the stern rises. It also gains lift as the stern falls. This keeps the prop loaded without dragging the tail. Note also the twin air rudders. This keeps the boat running straight at speed with a small water rudder. You might even be able to shorten the rudder more so it only works at low speed and mostly is lifted out at maximum speed. The air rudders need to have a lot of area to equal a water rudder. This isn't as obvious because there are two air rudders. The final point is that the drive is offset to the right rather than angled to make the boat run straight. This doesn't show in the pictures. The whole design is a great example of using air rather than water to accomplish high speed stability.

Lohring Miller

 

[Ian Inverarity]

Lohring,

Certainly a different approach to outrigger design when compared to conventional designs. But I am sure that while the wing in ground effect would stabilize the height of the prop at speed in the calm water used for SAW trials, surely rough water would disturb this ground effect? So do you think this design approach has promise for oval racing outriggers?

Ian.

 

[lohring]

Air trapped hulls are wings in ground effect. Cats, tunnels, and hydros all use them in models and full scale boats.

Lohring Miller

 

[Andy Greene]

What has Jorge been up too lately ? hadnt heard much from those guys ??

Andy

 

[lohring]

He's working and racing in Germany. In his spare time he explains motor theory.

http://www.rumrunnerracing.com/feforums/showthread.php?t=30861

Lohring Miller

 

[Jim Caldwell]

And very well also.