On Sat, Jan 01, 2005 at 05:13:14PM -0500, David Megginson wrote:
> > Also, it would need someone to model the gearbox and FADEC for the
> > turbodiesel
> > engines (includes autopitch etc).
>
> That, I think, would be a much easier problem.
The FADEC is easy as long as everything works normally. Things get more
complex if you want to model failures.
Moreover, one wants to model the automatic engine check sequence.
FWIW, I have a performance table derived from a chart in the Thielert OMM.
The chart (not the OMM, I think) is also available from their web site.
========================================================================
P_max = 99e3 // Max power [W]
M_max = 410 // Max torque [Nm]
//
// Desired RPM as a function of power lever position.
//
RPM_desired = {
{ 0 .2 .75 1 }
{ 2175 1750 2000 2300 }
}
//
// Mapping of power lever position (normalized) and air density [kg/m^3]
// to power output (ratio to P_max).
//
// Cf. Thielert OMM, Section 3.6 Power curve.
//
// Model valid up to 18000ft density altitude.
//
// Power output is constant below 6000ft.
//
P_out = {
{
// Power lever
{ 0 .25 .5 .65 .75 .9 1 }
// Rho (density altitude in feet: { 6000 8800 14300 18000 })
{ 1.0239 .9392 .7885 .6958 }
}
{
{ 0 .33 .54 .69 .74 .93 1 }
{ 0 .33 .54 .69 .74 .92 .94 }
{ 0 .34 .54 .69 .74 .92 .94 }
{ 0 .43 .52 .62 .66 .69 .7 }
}
}
Cheers
-Gerhard
--
Gerhard Wesp o o Tel.: +41 (0) 43 5347636
Bachtobelstrasse 56 | http://www.cosy.sbg.ac.at/~gwesp/
CH-8045 Zuerich \_/ See homepage for email address!
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