Authorised Vendor DK Sigma Motion System | USA Made
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Doing some accelerated testing at World of Racing, sim center in Pasadena.
So far very disappointed with the many manual seat sliders out there. Many of them have inherent slop, they have to, in order to function and slide. But the material choice, mild steel, means that they become even more sloppy once motion or haptics is added. Our inhouse electrical seat sliders don't have this problem but are also several hundred dollars more. The lead screws on our electrical sliders had zero slop and you definitely feel more of the haptics. You can have the best haptics in the world, but if your seat, sliders and side mounts are sloppy, many of those haptics are lost and not translated to the body.
So far very disappointed with the many manual seat sliders out there. Many of them have inherent slop, they have to, in order to function and slide. But the material choice, mild steel, means that they become even more sloppy once motion or haptics is added. Our inhouse electrical seat sliders don't have this problem but are also several hundred dollars more. The lead screws on our electrical sliders had zero slop and you definitely feel more of the haptics. You can have the best haptics in the world, but if your seat, sliders and side mounts are sloppy, many of those haptics are lost and not translated to the body.
If you are at the ADAC expo in Germany this weekend. Check us out at the Cooler Master booth.
DK2 on a custom chassis with a Tillet B10XL bucket.
VR Motion Compensation working fantastic. Thank-you Jonathan for doing all the hard work!
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DK2 Motion Featured
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He makes no sense from a sim-racers perspective; lowering the seat in the frame would only reduce the arc of motion and drop the centre of gravity ... great for a car or motor-cycle in real world motion, counter intuitive for a static rig though. The further away you are from the pivot point the greater the angular movement, this will translate into an increase in perceived speed and a greater overall feeling of motion.
My advice is to spend more time enjoying sim-racing and less time playing with pencils.
My advice is to spend more time enjoying sim-racing and less time playing with pencils.
BMW Motorsports [ DK2+ Integrated ]
The DK-X actuators can dynamically move over 5000 lbs. and each actuator weighs almost 100 lbs. each.
A lesson in cable management...
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Some interesting power consumption measurements from Dan Suzuki:
John. You are completely backwards in your thinking on this. Lowering the seat into the frame absolutely increases the performance of the rig. What you are claiming is assuming the 3dof system is there to provide lateral g force sensations which it does not. It provides sensations of chassis movement.
I know you haven't done this, I would advise you to try it for yourself before you make such claims. Smoother motion is better motion. The higher the CG is from roll center just makes it harder for the actuators to deliver smooth motion.
Ask me how I know, pic for reference.
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Our software prompts you for your measured actuator location on initial startup. This is the only way to ensure that the roll and pitch amounts are exactly to what the software commands. No guesses and no gimmicks.
This is good push back, and one thing to remember is that there are always tradeoffs.
1. Further from the pivot center you do get more angular movement, but at what cost?
2. Closer to the center you get less angular movement, but at what compromise?
Is it harder to stop and change direction in #1 or in #2. Lots of other compromises to consider.
Having a greater roll also moves you further away from the monitors. So a complete system integration should also be considered.
But the main reason why a lower roll center "feels better" (subjective) in a sim, and in a car is that you are closer to the rotational center and can feel the changes in rotation better. It's basically a lever.
So you feel more immediate rotation near the center at the cost of less angular movement (as you pointed out correctly). The opposite is the feeling you get in a truck, where you sit 20+ feet up from the ground and you feel more movement but at a cost, greater inertia. It's easier to stop and change direction, near the center, then it is at the edge. This is also why sports cars, F1 cars and even rally cars put the driver in the middle of the chassis, as low as possible, closest to the rotational center as possible. Rally cars are really cool this way, where often the driver sits right behind the B-pillar, almost in the rear side of the car. The co-driver sits even further back and even lower than the driver, as he does not need to see as well over the hood of the car. ;-)
Good discussion.
