Maximising water flow into an intake on a race boat

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SUMMARY

The discussion focuses on optimizing water flow into the intake of a racing jet boat, specifically addressing the 'spoon effect' which enhances intake pressure and speed. Key factors include the radius and measurements of the intake lead, which are influenced by the boat's speed (80, 100, and 110 mph) and weight. The concept of form drag is also mentioned, indicating its relevance to the design considerations for tunnel hulls. Participants are encouraged to share insights on measurements and design adjustments to maximize performance.

PREREQUISITES
  • Understanding of fluid dynamics principles, particularly related to drag.
  • Knowledge of jet boat design, specifically tunnel hull configurations.
  • Familiarity with the concept of intake pressure and its impact on speed.
  • Basic grasp of measurement techniques for radius and angles in marine engineering.
NEXT STEPS
  • Research the effects of form drag on jet boat performance.
  • Explore design techniques for optimizing intake geometry in racing boats.
  • Study the relationship between boat speed and water flow dynamics.
  • Investigate advanced measurement tools for precise intake design adjustments.
USEFUL FOR

Racing boat designers, marine engineers, and enthusiasts looking to enhance the performance of jet boats through optimized intake systems.

NZJet
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I've looked at lot of information on the net and have picked up a few things.

My query is how to work out the optimum radius and measurements for the lead into an intake on a racing jet boat?

We cruedly term it the 'spoon effect' where the water runs along the bottom of the boat and up into the intake. The more the intake pressure the faster you go!

From what i can tell this is the form drag effect (correct me if wrong).

I imagine the radius (distance) will change with the speed relative to the water as well. The weight of the baot will also have an effect. These are tunnel hulls so the weight on the water is minimal.

I'm assuming speed will also be important? Assume 80, 100 and 110 mph

Any feedback appreciated. Happy to answer any questions on measurements etc... Help this petrolhead please!
 
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