I been dreaming of building a two seater so that myself and my dad could keep flying together once he loses in pilot license.
Watching Roland Schieller's 2 DOF platform https://www.youtube.com/watch?v=nwZyLSjaYts made me realized it was possible with reasonable parts.
Like Roland van Roy I have a limited ceiling height constrain so I had a pretty good idea on how to attack the problem after looking at his DIY Motion Platform III http://www.simprojects.nl/diy_motion_platform_iii.htm
Reading futursims' most than excellent post http://www.x-sim.de/forum/viewtopic.php?f=38&t=909 got me back the knowledge I needed to get me going.
Thank you, my maths were so far away. I love you man

I still had one major problem. Maybe it's was in my mind but , I leave in Quebec/Canada I found it hard to find mechanical parts and precision metal working suppliers.
That all changed with my new job. I finally got the chance to meet very nice mechanical people that are building machines for a leaving and now I know about suppliers like:
- http://www.cbrlaser.com
http://www.mcmaster.com
http://www.misumiusa.com
http://www.igus.ca/?c=ca&L=en
etc.
I also managed to find an US company http://www.automationdirect.com that sell AC/DC motors, drives and gear boxes at a very reasonable price.
My platform's characteristic would basically look like this:
- 1.8m width x 1.5m length
2.13 m : Max Height including motion & heave
180 View : With 5 27" LED monitors
275 Kg : Max Platform Weight
20 deg : Max pitch and roll angular movement
35 deg/s : Max angular speed
0.080 : Max heave movement
9,81 m/s2 : Max heave acceleration
4 actuators
Actuator driven by 220V, 3 Phases, AC motor with VFD drive
24A @ 220V : Max source power
One thing a wanted after reading futursims' post was to obtain the drive motor characteristics starting from the platform parameters instead of designing the platform from motor parameters.
I have been working for the past months on a set of excel sheets that allowed me to reproduce futursims' platform but I ended with one that could not fit into my basement.
My newest version aims at designing a DIY Motion Platform III like platform that is not making use of cables and without a central pin for preventing swinging motion.
I will surely have questions as I have not been doing maths and mechanical physic for the last 25 years but I'm sure it will be a fun ride to build it.
I'll leave you with an image of what is to come and will be posting progress as I make them.