109 advice needed (climb)

[ACE-OF-ACES]

Originally Posted by AKA_Tenn

if thats's the case why do people complain about flight models here? seems to me these guys just need to learn their plane instead of insist everything bends to their will...

There is a lot of truth in that

The problem is typically two fold, one the sim pilot does not know what the value should be, and two they preformed the test wrong. Which is why it is so important to record a track file of any so called 'test'

Which is not to say there can not be an error in the FM! Just that typically it is in the sim pilot!

The FM, like any program, follows the rule of garbage in garbage out

With that said know that the 'math' of the FM is the same for all planes (subtle differences for say single vs. twin, etc). What makes a P51 fly like a P51 is when the P51 parameters are used as inputs to the FM. For a simple example say the 'math' of the FM was as follows

y = CL*x

Where

y is the output (result)
x is the input
CD is the 'drag' parameter (coefficient)

Say

x = 3
CD = 5 for a P51
CD = 5.5 for a Bf109

Than the output y would be for the given x input

y = 15 for a P51
y = 16.5 for a Bf109

Lets assume that the value of CD is not 'known' for the WWII plane we want to simulate.. In such a case you could just pick a value of CD based on other know values of similar planes (happens a lot in RL) or maybe they calculate it offline using another another program (say simulated wind tunnel) that uses some 3D model to calculate CD

In either case, a sanity check of the value you pick can be check by comparing some of the simulation results to real world results.. In this case say top speed.

Problem with most sim pilots is they don't even know what value they should obtain during a test! Let alone able to record 'all' the values that can affect your speed. For example, to test for top speed you have to be able to hold your alt within around +/-100ft.. Most sim pilots 'think' they can do this no problem.. I can tell you how many sim pilots were amazed at how much the alt varied during their flight! Which I was able to show them by using DeviceLink to record the values of altitude and speed and plot them.. And sure enough.. Most of the guys who said the plane was too fast, where actually loosing alt (shallow dive) when the obtained that max speed, and visa versa, sure enough the guys who said the plane was too slow, where actually gaining alt (shallow climb( when the obtained that max speed.