Re: [Jsbsim-devel] Modelling a windmilling propeller

[Jon S B. <js...@ha...>]

On Fri, 28 Dec 2007 23:54:22 -0800 (PST)
  Craig Meyer <cra...@ya...> wrote:
> Please give me some pointers as to how to learn more about the 
>propeller/engine model works in DATCOM/JSBSim.
> 
> That is, I need to know if does the following things (and would like 
>to enhance the model if not):
> 1) The way a propeller becomes a not-very-efficient windmill when 
>spinning too slowly for the given airspeed.

This should be accounted for and properly modeled if the propeller 
thrust and power curves are well-defined.

> 2) How, when that happens, it actually imparts a torque on the 
>engine, causing it to speed up.

This should also work.

> 3) Plus, I'd like to define a propeller based on a symmetric (NACA 
>four-digit) airfoil.

This might be a little tougher, possibly requiring blade element 
analysis, or finding an already defined propeller definition?

Jon