+russouk2004 Posted February 23, 2020 Posted February 23, 2020 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 Quote
+Crusader Posted February 23, 2020 Posted February 23, 2020 (edited) mass = kilogram inertia = wait for experts Edited February 23, 2020 by Crusader 1 1 Quote
+guuruu Posted February 23, 2020 Posted February 23, 2020 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. 1 Quote
+russouk2004 Posted February 24, 2020 Author Posted February 24, 2020 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 Quote
+guuruu Posted February 24, 2020 Posted February 24, 2020 (edited) m/s Edited February 24, 2020 by guuruu Quote
+baffmeister Posted February 26, 2020 Posted February 26, 2020 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 ] 1 Quote
+guuruu Posted February 26, 2020 Posted February 26, 2020 (edited) 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 1 Quote
+baffmeister Posted February 26, 2020 Posted February 26, 2020 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! 3 Quote
+guuruu Posted February 26, 2020 Posted February 26, 2020 1 hour ago, baffmeister said: the international foot, and the avoirdupois pound.[2] 1 Quote
+russouk2004 Posted February 26, 2020 Author Posted February 26, 2020 (edited) Edited February 26, 2020 by russouk2004 5 Quote
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