I know...im stupid but...

[+russouk2004 6,958]

I cant recall how mass is written...what unit is calculated ?...kilos pounds etc ?

EmptyMass=14000.00

also empty inertia...how do we asses a planes inertia ?

thnx

[+Crusader 2,101]

mass = kilogram

inertia = wait for experts

Edited February 23, 2020 by Crusader

[+guuruu 5,909]

Inertia is probably in kgm (or Nm?). It's sum of masses multiplied by distance to CG. Three values for all axis.

It determine force on steering plates needed to start turn or climb.

 

[+russouk2004 6,958]

Thanks...also

 

are these in Knots ? or KM\h ? or IAS ?

StallSpeed=59.01
CruiseSpeed=205.8
ClimbSpeed=200.1
CornerSpeed=192.9

MaxSpeedSL=269.1

[+guuruu 5,909]

m/s

Edited February 24, 2020 by guuruu

[+russouk2004 6,958]

Thanks again

 

[+baffmeister 1,205]

On 2/23/2020 at 3:22 PM, Crusader said:

mass = kilogram

inertia = wait for experts

To calculate inertia, find a ThirdWire aircraft with a similar configuration and mass, then copy the inertia values. [I know that sounds lame but I tried a simplified approach once and the results were off the charts.]

 

On 2/23/2020 at 4:30 PM, guuruu said:

Inertia is probably in kgm (or Nm?). It's sum of masses multiplied by distance to CG. Three values for all axis.

Just an observation but in the Hud De-Bug mode the Inertia values are shown in Slugs-Ft^2 [whatever that is ]

[+guuruu 5,909]

38 minutes ago, baffmeister said:

Slugs-Ft^2 [whatever that is ]

https://en.wikipedia.org/wiki/Slug_(unit)

So probably the easiest way is calculate it in kg*m^2, then convert to slugs ;-)

But baffmeister's method is the best. Fast and simple.

Edited February 26, 2020 by guuruu

[+baffmeister 1,205]

One slug has a mass of 32.1740 lb (14.59390 kg) based on standard gravity, the international foot, and the avoirdupois pound.^[2] At the Earth's surface, an object with a mass of 1 slug exerts a force downward of approximately 32.2 lbf or 143 N.^[3][4]

Now I get it!

[+guuruu 5,909]

Ofc, it's easy and logic

[+guuruu 5,909]

1 hour ago, baffmeister said:

the international foot, and the avoirdupois pound.^[2]

[+russouk2004 6,958]

Edited February 26, 2020 by russouk2004