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34' Odyssey
Powered radio controlled model powerboat

This is a 1/8 scale (51" LOA) model.

The color and detail in these photos is not the greatest. Still, you can get the idea. We built this 1/8 scale model of the client's boat before building the underwater control surfaces: skeg, rudder, trim tabs, etc. It is not very difficult to design a fast powerboat so that it floats on its lines and attains the desired speed with the desired power. However, it is not so easy to design underwater control surfaces which will perform perfectly and without alteration on the client's boat. The dynamics are simply too difficult to model mathematically. Hence this model. We made some changes to rudder and skeg size, placement, and airfoil type as a result of model testing. The boat runs just like the model: scaling factors are well known.

We could have done the more common tank testing. However, that would have given us only information about pitch, heave, and speed. These quantities, while important, were known to us from previous, similar hulls. Tank testing would not have told us much about the dynamic response of the boat to steering input.

The model just coming on plane. Note the similarity to the photo of the full-size boat at about this same scale speed.

Going some faster here. Again, note the location of the bow thruster. The wake pattern is about the same as the full-size boat, though its appearance is different due to non-scale differences in surface tension.

Full throttle, 30 knots plus for the full-size boat. Very similar spray pattern and running attitude.

A view from the stern, again showing the lovely wake and dry boat.

Turning to starboard.

Turning to port. Notice that she banks into the turn similarly in both turns, just like the full-size boat does. Banking into the turn is by far the most comfortable, and is a function of rudder and skeg size and placement.

Though we fitted trim tabs to the model boat, we concluded that they would not be necessary to adjust the fore-and-aft running attitude of the boat. They are not being used in these photos. They also were not necessary in the full-size boat, except to make small adjustments in heel to accomodate moving weights (persons). They are kind of fun to play with, though.

The point of showing you these photos is to literally illustrate one of our methods of ensuring the integrity of our design process. The client gets what he is paying for. A photo of a computer screen with some lines on it, or a photo of a large spreadsheet isn't very informative, though we also use those very important design tools.



For brochures on semi-custom wood boats or further information on our custom wooden boat building and design services, please email us by clicking on the E-MAIL icon below, or inquire by mail to:

Nexus Marine Corporation   Phone 425-252-8330
3816 Railway Ave.    
Everett, WA 98201-3838 Email to Nexus Marine Corporation
service (at)
Custom wood boat builders!

We are located on the Snohomish River in the Pacific Northwest, about 20 miles north of Seattle.
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Odyssey Home
Exterior Photos
Interior Photos
Model Testing