RC Crew Chief Software
#586
The most logical explanation it seems to me about the diff height effects has to do with moving the CG higher.... Higher CG = more chassis roll, and Lower CG = less chassis roll. Maybe there is some other effects as well, such as the driveshafts wanting to be straight, but the roll is a function of the CG in relation to the roll center. The further apart they are, the more effect or leverage there is.
#587
Tech Addict
iTrader: (1)
IMO the effect of raising the diff is small. The effect on CG height can be calculated and I would guess it to be in the .2 to .5mm range depending on if one or both are raised. I agree this is probably the single biggest effect.
Reducing the diameter of the diff pulley will reduce the rotating mass of the of the pulley and drive belts. That will reduce spin-up time of the rotating components. Again small effect.
Gyro effect of smaller pulley will also be small, the diff itself is still the same size and weight so it is only the pulley that is changed. I don't think raising it would change the gyro effect. Any axle gyro forces would be small too as gyro effects are a function of the radius^2 which is small for an axle.
I guess basically it's a lot of small effects which can add up. Would be hard to quantify though.
Reducing the diameter of the diff pulley will reduce the rotating mass of the of the pulley and drive belts. That will reduce spin-up time of the rotating components. Again small effect.
Gyro effect of smaller pulley will also be small, the diff itself is still the same size and weight so it is only the pulley that is changed. I don't think raising it would change the gyro effect. Any axle gyro forces would be small too as gyro effects are a function of the radius^2 which is small for an axle.
I guess basically it's a lot of small effects which can add up. Would be hard to quantify though.
#589
Tech Regular
Dealing with 'camber slop' when translating values from the software model to the physical car. Seems like most of my cars have 0.5 to 1.0 degree of slop which is not evident at rest or on setup blocks unless one pushes the setup blocks out slightly at the top.
For example if I set 0.5 camber on the wheels at rest, once the car starts cornering that 0.5 becomes zero before any force can be transmitted through the tire.
Wondering how others deal with this or if everyone els's car has no slop.
For example if I set 0.5 camber on the wheels at rest, once the car starts cornering that 0.5 becomes zero before any force can be transmitted through the tire.
Wondering how others deal with this or if everyone els's car has no slop.
#590
Tech Fanatic
iTrader: (7)
Dealing with 'camber slop' when translating values from the software model to the physical car. Seems like most of my cars have 0.5 to 1.0 degree of slop which is not evident at rest or on setup blocks unless one pushes the setup blocks out slightly at the top.
For example if I set 0.5 camber on the wheels at rest, once the car starts cornering that 0.5 becomes zero before any force can be transmitted through the tire.
Wondering how others deal with this or if everyone els's car has no slop.
For example if I set 0.5 camber on the wheels at rest, once the car starts cornering that 0.5 becomes zero before any force can be transmitted through the tire.
Wondering how others deal with this or if everyone els's car has no slop.
#591
I got the software and works fine but I can't download files from the homepage!? Right click doesn't give me the option ''Save File As'' like there are no files!?
Thanks for help.
Thanks for help.
#593
Tech Regular
iTrader: (2)
I've been using the trial version for a few days now and this software has me so excited I could **** myself. Really takes the guesswork out of a TON factors. Best weapon in the pit bag. I do however wonder why rear toe and anti-squat aren't factored in as well as changing the front arm angles? Those definitely play a factor in traction and grip. BTW...I'm experiencing numerous bugs in the trial version that I hope go away with a paid version such as changes made and saved on one tab don't get transferred to the others. Its a bit frustrating to make changes and save them then have to go through the settings on another tab to make sure they changed and find that they didn't. This defeats the purpose of having a "save" function so I'm hoping this is just part of the reduced functionality of the trial version.
#594
Tech Addict
iTrader: (1)
I've been using the trial version for a few days now and this software has me so excited I could **** myself. Really takes the guesswork out of a TON factors. Best weapon in the pit bag. I do however wonder why rear toe and anti-squat aren't factored in as well as changing the front arm angles? Those definitely play a factor in traction and grip. BTW...I'm experiencing numerous bugs in the trial version that I hope go away with a paid version such as changes made and saved on one tab don't get transferred to the others. Its a bit frustrating to make changes and save them then have to go through the settings on another tab to make sure they changed and find that they didn't. This defeats the purpose of having a "save" function so I'm hoping this is just part of the reduced functionality of the trial version.
If this is not the case then if you can provide some details of the bugs you have encountered I will fix them.
I am continuously working on updating the program and just like anything it takes time and effort. Kind of like why don't the RC manufacturers just come up with the perfect car to start with so we don't have to buy new versions all the time. Toe and squat is something that will be included in a future update.
Right now I am in the final testing stage of adding Damping Models to RC3. It will allow you to see the effect of changing piston hole sizes, hole numbers, oil viscosity and temperature. This update should be out very soon.
#595
Tech Regular
iTrader: (2)
What you may be encountering regarding saving changes is that when you make changes on the Weight Transfer Sheet or Dynamic sheets these changes are not automatically transferred to the current setup. There is a button on each of those pages that allows you to either update the current setup or create a new one.
If this is not the case then if you can provide some details of the bugs you have encountered I will fix them.
I am continuously working on updating the program and just like anything it takes time and effort. Kind of like why don't the RC manufacturers just come up with the perfect car to start with so we don't have to buy new versions all the time. Toe and squat is something that will be included in a future update.
Right now I am in the final testing stage of adding Damping Models to RC3. It will allow you to see the effect of changing piston hole sizes, hole numbers, oil viscosity and temperature. This update should be out very soon.
If this is not the case then if you can provide some details of the bugs you have encountered I will fix them.
I am continuously working on updating the program and just like anything it takes time and effort. Kind of like why don't the RC manufacturers just come up with the perfect car to start with so we don't have to buy new versions all the time. Toe and squat is something that will be included in a future update.
Right now I am in the final testing stage of adding Damping Models to RC3. It will allow you to see the effect of changing piston hole sizes, hole numbers, oil viscosity and temperature. This update should be out very soon.
Last edited by RoketRdr; 06-25-2016 at 03:44 PM. Reason: Spelling mistake
#596
Tech Addict
iTrader: (1)
If you make a change on the Weight Transfer page and use "Copy New Settings to Setup" the setup gets updated to reflect the new values but the settings on the other tabs remain unchanged. To get everything to update requires re-selecting the current setup or selecting a new setup from the list. I have thought of doing it as you suggest but since you are the first person to comment on it haven't felt the need. You make a good point though.
To change the CG position permanently you need to change it in the "Car Manager". The intent here is the CG position is a measured value so it shouldn't be changed unless there is justification. Using the Wheelbase/Track Width/CG Position Form is just to provide a quick method of comparing the effect of changing other variables.
To change the CG position permanently you need to change it in the "Car Manager". The intent here is the CG position is a measured value so it shouldn't be changed unless there is justification. Using the Wheelbase/Track Width/CG Position Form is just to provide a quick method of comparing the effect of changing other variables.
#597
Tech Regular
iTrader: (2)
If you make a change on the Weight Transfer page and use "Copy New Settings to Setup" the setup gets updated to reflect the new values but the settings on the other tabs remain unchanged. To get everything to update requires re-selecting the current setup or selecting a new setup from the list. I have thought of doing it as you suggest but since you are the first person to comment on it haven't felt the need. You make a good point though.
To change the CG position permanently you need to change it in the "Car Manager". The intent here is the CG position is a measured value so it shouldn't be changed unless there is justification. Using the Wheelbase/Track Width/CG Position Form is just to provide a quick method of comparing the effect of changing other variables.
To change the CG position permanently you need to change it in the "Car Manager". The intent here is the CG position is a measured value so it shouldn't be changed unless there is justification. Using the Wheelbase/Track Width/CG Position Form is just to provide a quick method of comparing the effect of changing other variables.
#600
Tech Regular
iTrader: (2)
Want to add .02 to the raised diff height discussion. There are several of us that have been talking about it lately, including a few pro racers, since the Serpent Cobra GT 3.0 has the option to install spacers to raise the diffs front, rear or both by 5mm. The GT8 class are buggy based so lowering the car for onroad racing increases the arm and axle angles upward. Installing the diff spacers brings them back level while keeping the chassis low to the ground and in onroad form. This also affects the RC and CG of course. Once I get my new Cobra GT I'm going to take all the measurements for factory kit and then save a different file with the added diff spacer height so the difference can be seen and played with.