The Merlin is a rotary engine, isn't it?
A rotary engine ? As in http://travel.howstuffworks.com/rotary-engine.htm ?
Most people probably will agree that it's a V-12 piston engine ;-)
Details about the engine oil pressure might be documented in some sort of
engine manual:
Hermann Schiffer wrote:
The Merlin is a rotary engine, isn't it?
A rotary engine ? As in http://travel.howstuffworks.com/rotary-engine.htm ?
He meant radial, of course, which was true of most WWII era aircraft
engines other than the Merlin.
And if you really want to nit, what you describe is
On Fri, 23 Apr 2004 17:43:59 +0200
Luca Masera [EMAIL PROTECTED] wrote:
Hi everyone,
about JSBBim: the airplane has three tanks, but the flight
model uses only the first. In other words, if I start FlightGear
with the first tank empty, the engine is off and doesn't
starts. This happens even
Luca Masera wrote
Hi everyone,
I'm creating the 3d instruments for the mb339 using JSBSim
and YASim as flight dynamics models.
The questions are:
about YASim: in which units is measured the oil pressure?
In JSBSim the value is holded by oil-pressure-psi and it's
measured in
Luca Masera wrote:
about YASim: in which units is measured the oil pressure?
In JSBSim the value is holded by oil-pressure-psi and it's
measured in psi; in YASim is holded by epr but the units
are missing.
Er, that's an Engine Pressure Ratio , which is a thrust metric used in
early jets in
Andy Ross wrote:
Er, that's an Engine Pressure Ratio , which is a thrust metric used in
early jets in lieu of N1 RPM. YASim doesn't model oil pressure right
now, because I'm not aware of a good basis on which to do so. If you
have numbers you want to match for this particular aircraft, I could
Andy Ross wrote:
But the idea behind YASim is to produce plausible results for all
possible engines; oil pressure is one of those values that is (AFAIK)
just too engine-specific.
Further to the point, here is some information from the Lycoming O-320
Operator's manual; it would make a good
--- Andy Ross [EMAIL PROTECTED] wrote:
Luca Masera wrote:
about YASim: in which units is measured the oil pressure?
In JSBSim the value is holded by oil-pressure-psi and it's
measured in psi; in YASim is holded by epr but the units
are missing.
Er, that's an Engine Pressure Ratio ,
David Megginson wrote:
How about allowing the config to contain a couple of sample values
and then interpolating (taking into account outside temperature,
engine temperature, and power setting)?
Sure. That was the idea with the Nasal script, actually. Set it to
poll every second or so and
David Megginson wrote
Andy Ross wrote:
But the idea behind YASim is to produce plausible results for all
possible engines; oil pressure is one of those values that
is (AFAIK)
just too engine-specific.
Further to the point, here is some information from the
Lycoming O-320
Vivian Meazza wrote:
The Merlin has a gear-driven oil pump and, I assume, a pressure relief
valve. I was going to assume that oil pressure was a function of rpm with
max and min values.
The Merlin is a rotary engine, isn't it? In any case, a pump attached to
the engine accessory drive (along
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