Go Back   Science Forums Biology Forum Molecular Biology Forum Physics Chemistry Forum > General Science Forums > Physics Forum
Register Search Today's Posts Mark Forums Read

Physics Forum Physics Forum. Discuss and ask physics questions, kinematics and other physics problems.


Problem with flight simulation

Problem with flight simulation - Physics Forum

Problem with flight simulation - Physics Forum. Discuss and ask physics questions, kinematics and other physics problems.


Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 08-14-2005, 09:16 AM
Grandss
Guest
 
Posts: n/a
Default Problem with flight simulation



HI all,

I try to make a flight simultor with real physics equations.
I use this book : David Bourg, Physics for game developers, Ed. O'reilly
(link: [Only registered users see links. ])
I try his flight simulator but i have a problem.
It's impossible to pitch down the plane.
I think there is a problem somewhere with his equation, but i don't find
it (I'm not enought good in physics).
So, if someone can help me ?

Thanks in advance
Reply With Quote
  #2  
Old 08-14-2005, 09:47 AM
LeoK
Guest
 
Posts: n/a
Default Problem with flight simulation

Hi

Think you have to give some basic data about any simulation you do.
Perhaps then some could advise you.

Take care
LeoK

Reply With Quote
  #3  
Old 08-14-2005, 10:01 AM
Grandss
Guest
 
Posts: n/a
Default Problem with flight simulation

Grandss a écrit :

Sorry, here the link for source code (in c++)
[Only registered users see links. ]
Files are in Flight Sims
Reply With Quote
  #4  
Old 08-14-2005, 10:38 AM
LeoK
Guest
 
Posts: n/a
Default Problem with flight simulation

Run the program and take down some data.

Believe the c++ is ok, but something is missed by you perhaps.

Give the basic data here perhaps, something, which seems not ok.

Take care
LeoK

Reply With Quote
  #5  
Old 08-14-2005, 10:44 AM
LeoK
Guest
 
Posts: n/a
Default Problem with flight simulation

Be sure the c++ does pitch, and not being a "light" c++ example.

Take care
LeoK

Reply With Quote
  #6  
Old 08-14-2005, 11:03 AM
Grandss
Guest
 
Posts: n/a
Default Problem with flight simulation

LeoK a écrit :
Sorry i'm not sure to understand you (my english is not very good)
Reply With Quote
  #7  
Old 08-14-2005, 01:04 PM
tadchem
Guest
 
Posts: n/a
Default Problem with flight simulation


"Grandss" <grandss@nospam> wrote in message news:42ff2510$[Only registered users see links. ].lu...

Rephrasing:
"Be sure that the C++ program is capable of accommodating pitch as a flight
variable, and that the code is not based on an oversimplified example."

In particular make sure the coordinate system is truly 3-D. For example,
the expression for aerodynamic lift should be resolved into horizontal as
well as vertical components, based upon the pitch and roll angles. If you
do not see each of the forces demonstrating contributions in multiple
directions, the example is oversimplified.


Tom Davidson
Richmond, VA


Reply With Quote
  #8  
Old 08-14-2005, 01:11 PM
LeoK
Guest
 
Posts: n/a
Default Problem with flight simulation

Are you not familiar with demo programs?

Is this a demo program, which do not pitch?

LeoK

Reply With Quote
  #9  
Old 08-14-2005, 01:18 PM
Grandss
Guest
 
Posts: n/a
Default Problem with flight simulation

tadchem a écrit :
Hi, thanks for precision
I think code is not too simplified
the 4 forces (thrust, drag, lift and mass) are take in consideration.
and the author calcute everything about each part of plane
i check flight commands, but it appears OK.
I continue to search
Reply With Quote
  #10  
Old 08-14-2005, 08:48 PM
tadchem
Guest
 
Posts: n/a
Default Problem with flight simulation


"Grandss" <grandss@nospam> wrote in message news:42ff44c2$[Only registered users see links. ].lu...


That is the minimum number of forces necessary for a functional program.


Check to see if there is any 'sideslip' (horizontal force to port or
starboard) when the lift force is calculated while the aircraft is banking.

Sideslip is the force that *actually* makes the aircraft turn.

If the plane is in a banking turn, the lift should not all be vertical.
Simple trigonometry should be used to calculate how much of the sideslip is
produced to turn the plane, and how much the vertical component of lift is
reduced. If the reduced vertical lift does not match the weight, the plane
will lose altitude.

Scan through the code looking for trigonometric functions - mainly the sine
and cosine functions. If you don't see them, don't use the code.


Good luck.


Tom Davidson
Richmond, VA


Reply With Quote
Reply

Tags
flight , problem , simulation


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Another contimation problem helpme Cell Biology and Cell Culture 3 05-18-2010 11:13 PM
Another contimation problem helpme Cell Biology and Cell Culture 1 05-17-2010 09:53 AM
SDS-PAGE problem Steve Nothwehr Protocols and Methods Forum 2 10-16-2009 08:59 AM
Simulation des Aufstiegs eines Stratosphärenballons und eines Fallschirmsprungs aus 30km bzw. 40km Höhe Jens Remus Forum Physik 33 12-03-2007 09:42 AM
Korrelationslänge aus einer Simulation? Andreas Tröster Forum Physik 0 08-22-2006 04:58 PM


All times are GMT. The time now is 09:14 AM.


Powered by vBulletin® Version 3.8.4
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Copyright 2005 - 2012 Molecular Station | All Rights Reserved
Page generated in 0.15796 seconds with 16 queries