Jim Wilson wrote:
> Here is my local config for the p51d yasim propeller. Most of these
> values are pretty much on target according to actual specifications.
> The problem is that it "appears" to not produce sufficient thrust.
I did actually get started on this at one point. :)
The first problem I ran into is that getting a manual pitch propeller
tuned is REALLY hard. Because of the way the numbers work (pitch in
YASim isn't an angle, it's a multiplier) it is very easy to move the
propeller into a pitch range where the efficiency drops near zero.
What I ultimately did was set the prop to have a standard variable
pitch governor and hack a printf() into the YASim loop to tell me what
settings the prop was actually using.
Then, a few days later, my copy of the F-51D Mustang POH arrived. It
turns out that this model (which I assume was identical to the wartime
P-51D -- they were surplus items, not new construction) in fact had a
standard RPM governor for its prop speed lever -- not a manual pitch
system at all.
What is the source for defining the Mustang's prop control as
manual-pitch? If it's not needed, I can all but guarantee that solver
tuning will be much easier without it.
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