On Wed, 2007-03-07 at 15:49 +0100, Anders Gidenstam wrote: > On Wed, 7 Mar 2007, AJ MacLeod wrote: > > > Possibly, but I'm seeing the same as Tim here now... and I had no trouble > > making it work before. I can start the engine at the first attempt, but no > > matter what I try or how high the RPM the a/c doesn't move at all. > > I'll add my vote for that something has gone awry with the An-2 recently. > I have flown it before but today it was impossible to get it to move > despite the engine running. My guess is that the updated version of > JSBSim caused the propeller definition to break (or exposed some > problem in it). Do we have any JSBSim propeller experts around that could > have a look at it? > > Cheers, > > /Anders
I am by no means an expert, but I took the liberty of running the numbers through aeromatic again. It looks like the original author generated the prop based on 1000 hp, then changed the numbers to 1300 hp. I started with 1300 hp, as a result aeromatic generated a different tables for power and thrust. I hand massaged the pitch to 17/32 as in the original file, and I lowered the diameter from 141.7 to 132 because it wouldn't start with 141.7 as a diameter. As a side note, the engine claims a displacement of 250 cubic inches and an output of 1300 horsepower! I suspect something isn't right. Aeromatic suggests a 1300 hp piston engine should displace ~2080 cubes. Ron
AV-2.xml
Description: application/xml
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