How can I calculate the pitch of a hovercraft propeller

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Discussion Overview

The discussion revolves around calculating the pitch of a hovercraft propeller, including the necessary variables and considerations for determining the number of blades required for optimal performance. It touches on both theoretical and practical aspects of propeller design.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant asks about the variables needed to calculate the pitch of a hovercraft propeller and how to determine the number of blades required.
  • Another participant suggests starting with the desired thrust, blade length, and available shaft horsepower as key variables for the calculations.
  • A later reply reiterates the initial inquiry and seeks clarification on the application of these calculations to ship propellers, specifically for smaller vessels like tugboats.
  • One participant mentions that measuring the angles of the blades at a specified radial distance is necessary for pitch calculation.
  • Another participant notes that determining the number of blades involves using blade element theory and rotor solidity analysis, suggesting practical experimentation with different blade sets.

Areas of Agreement / Disagreement

Participants express various approaches and considerations for calculating propeller pitch and blade quantity, with no consensus reached on a definitive method or solution.

Contextual Notes

Limitations include the need for specific measurements and assumptions regarding thrust and horsepower, as well as the applicability of hovercraft calculations to ship propellers, which remains unresolved.

Who May Find This Useful

Individuals interested in hovercraft design, propeller engineering, and those exploring the principles of thrust generation in marine applications may find this discussion relevant.

Frannas
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How can I calculate the pitch of a hovercraft propeller, what variables do I need?
How do I know how many blades must I use to get the ultimate end result?
 
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I am no aeronautical engineer, but you might want to start with:
How much thrust do you want to produce?
What is the length of each blade?
How much shaft HP can you generate?
Or, How much do you have?
 
jonathanh said:
I am no aeronautical engineer, but you might want to start with:
How much thrust do you want to produce?
What is the length of each blade?
How much shaft HP can you generate?
Or, How much do you have?

mm...sorry.. i am new here. and i have exactly the same question as his.
so, when i got all those specification. what should i do then?
does this calculations can be applied to ship propeller?
let's say ship in small size , about a size of a tugboat.

thanks before.
 
Frannas said:
How can I calculate the pitch of a hovercraft propeller, what variables do I need?

That would require you to measure the angles of the blade, usually at a specified radial distance (probably 0.75R).

How do I know how many blades must I use to get the ultimate end result?

That's a loaded question, as it would require using blade element theory and an analysis of the rotor solidity. In short, just build different sets of blades yourself, test it out and record the results.
 

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