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[bvillersjr]

It's like there is an echo in these forums

Too bad this stuff isn't in a document somewhere. It's a bit like a story passed down from generation to generation. A little bit of the story is lost each time it is told.

If you guys are interested in writting a document about profile creation, I'd be happy to review it and fill in any blanks.

[bleco]

Hi Bernard,

This topic is a direct response to yours:
vote-where-do-you-get-motion-profiles-t2949.html

I will try to contribute the more I can even if our DIY simulators designs are pretty much 'unique' and can result in different profile feeling.

The most important thing is that the effects values are correctly balanced... Thx to Mike, now I will be able to create and share good profiles quickly. I should release another one soon for the Lotus 79 ...

As for a documentation, yes it's definitely missing ... I wanted to create a little reminder guide for me so once it's done I could sent it to you ... I can't tell you when however ... If someone as more free time then go ahead!




Bleco

[bleco]

One thing I noticed is that your pitch maximum values are pretty low compared to mine. You should fine the steepest incline you can to get a pitch and roll value and then I usually add about 10 to 15% to that value

I have captured the values on Spa's first incline which is the first one right after the start and it's very steep and could be the reason why my values are so different then yours. I ran a couple of pass up and down in the right and opposite directions... I will try to make additionnal captures tonight and add a 10-15% like you mentionned.


Thx!


Bleco

[bvillersjr]

Glad to hear the you feel like you'll be able to contribute now.

I've been working for some time on the approach to designing a motion profile rapidly for the wizard in the Commander software. Mike and I discussed the results of that recently. The steps he is taking you through are almost in line with the steps that the wizard will help you to take even more quickly.

Also, I have devised a method to allow you to rapidly compensate for the differences in actuator angles, general dimensions and actuator stroke. My hope is that this will give us all an improved ability to exchange profiles EFFECTIVELY, which has not been achieved to date when crossing the boundary between DIY projects and pre-built offerings.

It's nice to have you on board and validating that the initial approach is effective. It would be great to get you involved in the remaining portions as well since you have differing geometry.

In light of recent events, I won't have much time for documentation, but am happy to review and fill in any missing pieces if you do have time to write something up. It would be great to see about 4 or 5 more people as enthusuastic as you about making quality motion profiles.

[ledfoot]

One thing I noticed is that your pitch maximum values are pretty low compared to mine. You should fine the steepest incline you can to get a pitch and roll value and then I usually add about 10 to 15% to that value

I have captured the values on Spa's first incline which is the first one right after the start and it's very steep and could be the reason why my values are so different then yours. I ran a couple of pass up and down in the right and opposite directions... I will try to make additionnal captures tonight and add a 10-15% like you mentionned.


Thx!


Bleco

Thats actually not a very steep incline at all. I usually find a very steep hill off track like at the bottom of the last turn at Lime Rock Park or even on the oval at Daytona. I take the Pitch reading with the car pointing up and the roll reading with the car sideways and then add about 10 to 15% to that value or even more depending on how steep the hill is.


....Mike

[bleco]

... On Spa track it's the most steep incline ... My profile was built on Spa track only. But it's logic to use all maximum possible values using multiple tracks to be able to use the same profile on multiple tracks and still have good pitch and roll effects ... Limerock and Laguna Seca should give good results.

Noted for myself ...;-)

Thx!

Bleco

[bleco]

It would be great to get you involved in the remaining portions as well since you have differing geometry.

In light of recent events, I won't have much time for documentation, but am happy to review and fill in any missing pieces if you do have time to write something up.

I would be happy to help you with the tests of the remaining portions of your project. For now, profiles sharing and helping you with the testing would be my only possible contribution. Little baby at home is taking a lot of attention and time ... But I have some free time at night

Will wait for a PM then ...





Bleco

[ledfoot]

... On Spa track it's the most steep incline ... My profile was built on Spa track only. But it's logic to use all maximum possible values using multiple tracks to be able to use the same profile on multiple tracks and still have good pitch and roll effects ... Limerock and Laguna Seca should give good results.

Noted for myself ...;-)

Thx!

Bleco

I used to capture some of these values on track as well until Bernard set me straight

What you should be looking for is the real world maximum pitch and roll value for that particular vehicle and then scale the value accordingly. You will never be able to get that value while driving on track because there are no inclines steep enough. If you could lift the car off the track in mid air and point it's nose straight up in the air, that would represent the maximum pitch value that could be achieved and if you turned the car on it's side in mid air, that would represent the maximum roll value that could be achieved. Since there is nowhere on track that is that steep, we need to look for the steepest incline we can place the car on and then record that value. The reason for then increaseing the value by 10 to 15% or more is to compensate for the fact that the hill is not a 180 degree incline. This will then allow you to scale the maximum amount of pitch and roll the car is capable of regardless of what track you are driving on. With the maximum properly scaled, you will get much smother g-forces.

For gaining maximum longitudinal values, you will want to find a track that has a very long straigt like Watkins Glen so that you can accelerate to maximum speed and then brake very hard in a straight line.

Recording maximum values for lateral motion is not as easy but can be achieved by finding a track that you can drive very well and finding a corner that you can hit the apex at it's maximum speed. Depending on how well you hit the corner, you can then also increase the recorded value by about 10 to 15% to compensate for not being able to gain the maximum possible g-forces in that corner.

Vertical maximum values should be recorded at a very bumpy area off track as long as the car does not fall into a pot hole .

Bernard and I have had numerous conversations about the easiest way to capture these values and the wizard that he is working on will most definately make this process easier for everyone.


....Mike

[bleco]

Thx again for sharing all this info, it's very usefull



Bleco

[bleco]

I have reworked my profile's effects values and intensity using your last advices ...



V1.3 Added


Bleco