Here comes the promised update:

Latest video of my motion sim.
(sorry took the video with my cell phone)

http://www.youtube.com/watch?v=sePqZbfT5bw

D I Y

Newbie driver.

Hurts me too, when i see him spin like this.
But its a heck of fun to see him try.

On the other hand - its fun spinning loops
with 490PS RWD !

I know first hand how hard driving gets if everything moves around instead of just the wheel. Tbh, I don't think there's any motion platform out there that actually helps you driving, as in replicating the seat of the pants feel. From my experience it merely throws you around and actually disconnects you from the game, as you're still wedged on a hydraulic seat while staring into a 19'' screen.

No. @ http://www.lfsforum.net/showthread.php?p=292656#post292656

Nice contraption. Wish I had one!

Is it suppose to tilt like that? Looks like you're playing a flight sim.

hehe i want a car that can take off too

No, you don't.

Vain

lol that's gold as well, shouldn't laugh though

Nothing happened to the driver, as far as I know.
But the car was badly hurt.

Vain

Could make a nice effect though when you are sitting inside your motion simulator and when you crash the whole contraption starts rolling around your room

Quote from AndroidXP :

I know first hand how hard driving gets if everything moves around instead of just the wheel. Tbh, I don't think there's any motion platform out there that actually helps you driving, as in replicating the seat of the pants feel. From my experience it merely throws you around and actually disconnects you from the game, as you're still wedged on a hydraulic seat while staring into a 19'' screen.

lets all pray that prodkletnov is right after all and well finally get some proper simulators in a few years

Is it done?
No, its just an update to the first post.

Is it supposed to move like this?
Yes it is! Thats the concept.
It simulates the sideforces as well as the accelleration
forces (positive and negative). 2DOF
Whats missing right now are bass shakers (need only to be
mounted) and the speakers behind the head.

Is it hard to drive, when the room around you moves?
Thats the concept of motion sims: you should be disconnected from
the static object "world". In our case we are considering
- a cover to focus on the screen (which is not the final one)
- 3d glasses (Z800)
Later one has our favour a.t.m. especially in combination
with TrackIR.
The only thing every sim lacks is prediction power, so there is
a delay of a tenth or hundredth fraction of a second.
Also, motorsport can generate very strong shifts in acceleration,
for a flight sim it is much easier and more perfect.

If you dont believe a motion sim is fun:
You are right. I have my fun meanwhile.

If you try out the Z800, please write a review of it, especially in connection with LFS/driving sims. I'd like to try some solution like that myself, but I'm not very sure of how well it really works.
Can you show a graph of the actually measured chassis position versus currently targeted position? I'd like to know how much the system lags behind. I imagin that the inertia of the chassis must be quite big which would lead to the chassis lagging behind the simulation by a tenth or two.

Z800 + motion sim + flight simulator must be quite cool.

Vain

@Vain

Yes, we wrote a protocoll during interface testing about
3 months ago. (and i even found it again!)
The inertia isn't that big. Both axis are pretty well balanced.
We have a weight of approx. 60kg + driver that is only
rotational accelerated. The hydraulics produce a force of
about 200dN (40mm @ 16bar) per axis and have a lever
at least twice the distance of the COG from the CORotation.

It does really shake well, in fact the motion base moves quite
a bit when in use.

I attached a graph of the lag. Even though its from an early
version that wasnt calculated correctly, it still shows the
lag sufficient enough. The calculated lag only displays the
voltage difference of the measuring tubes, not the time
of the lag.
Interestingly the lag gets smaller at the end of the test.
I have no idea why. Visually i'd say average is a bit more than
1/10th second lag at the beginning and sometimes far less than half.

Over all i am pretty pleased with the speed.
(100 of the horizontal scale is 1 second)
I never saw any manufacturer of commercial sims reveal any
data like this. And i am sure, there is hardly any faster one
out there even above $100000. (gee, all that braggin' illepall)

Hope that doesnt feed your envy too much.

How do you measure the real position? It seems rather quantized as if recorded with a low resolution A/D converter. I can see 1/10th Volt steps. And the time between the measurement steps also seems to be around 1/10th of a second.
But in general it looks pretty impressive and seems to have worked out well. Quick system response and still stable.
How much did you spend on the hardware? What kind of material/construction is the moving chassis?
You wrote "we are considering..." - how many people are involved in the project? What kind of project is it?

Vain

looks like it could use a better regulation

Zwei Deutsche auf englisch... amüsant.

"We" is 1 best friend of me, that has spent quite a lot of
time with me on this, 1 other good friend who wrote the
interface and me, that paid the bills and did most of the design.
I made the position measuring tubes myself. I figured that
a real DIY sim shouldnt have a 600 Euro per axis HF inductive
measuring system (well my wallet figured this out).
So its 50 reeds in parallel to avoid wear. They are really
fast (less than 1/1000th second) and stand more than
20 million cycles. An A/D USB Interface is used to measure
and switch the hydraulic valves at the same time.
Thats why position is measured in 1/10th Volt steps.
If i had more money i would throw in some proportional valves.
But i stopped putting more money in this at the moment.

The frame is 40x40 and 40x60 steel tube and rock solid.
I cannot say too much about the future of the project at the
moment. But it could be TUEV Bauart-certified with only small
modifications.

Quote from Shotglass :

looks like it could use a better regulation

A motion platform could always be better - it will never create another reality.
Helpfull suggestions and ways for improvement are always welcome

whoops nevermind i got the graphs confused ^^

Quote from Hyperactive :

Could make a nice effect though when you are sitting inside your motion simulator and when you crash the whole contraption starts rolling around your room

but very illepall idea. lol!

Quote from Vain :

Nothing happened to the driver, as far as I know.
But the car was badly hurt.

Vain

Nothing happend to the driver If you follow F1, im sure you know a guy called Mark Webber.