BobW

iTrader: (1)

Guess I must be asleep at the switch. Must have missed a post notification so apologize for not answering your questions sooner.

Thanks I need to add reverse bell crank, single bell crank, trailing axle and the ability to change Xbs. Will the adjustability ever end.

That car is beyond what RC3 can handle. Definitely outside the box design. Hope Serpent provides good setup info for that car.

RC3 assumes the caster angle remains constant so it can't handle variable caster

The next update will include the ability to change hinge pin inserts in the suspension blocks, shim wheelbase and trackwidth.

The closest there is to a 2wd SCT right now is a Losi 22T. Hard for me to get my hands on these as it is not a popular class around here. You can create your own models though just watch the videos on the website.

It's on the list for a future update.

Effect of trackwidth changes are already included. Simulating effects of diff oil and rear toe angle are not possible to simulate without having slip angle tire performance data. Not likely we will ever get this.

azeroth

iTrader: (21)

it is ok bob you do a good job

hyperdive08

iTrader: (4)

I can't seem to get the dynamics to show me how the car will react.. any ideas?

BobW

iTrader: (1)

If you can provide more details then I can help you out. Screen shots are very helpful. You can post them here or email them to me at [email protected]

John Wallace2

Bob, I tried emailing you last night but the email on your website did not work. Thanks to everyone who steered to this website since the other one I found had no posts since 2014. Anyway my question: I down loaded the trial version of the software and many features did not work (e.g., I could not import a chassis file I down loaded from your website). Is the trail version just very limited in what it does or did I do something when I down loaded the file?

BobW

iTrader: (1)

I did receive a email from you this morning but all it said was "TEST".

Importing files from the website is enabled in the Trial Mode so not sure why you are having a problem. If you let me know which model you are importing I'll have a look.

massenb203

Bob,

Will the Team C TC10 model be added to the car list?

massenb203

Will some of the new motors be added like the Trinty D4's, 24K's?

maris

Thanks for update. I'm curious to figure out if I have 1.1 x 4 piston with 300 oil, what oil will be roughly equivalent with 1.6 x 2 piston. I think I have general feel for how to do it (playing with either Damping tab or Chases setup/Shocks setting), but if you have any pointers, that would help.

One problem I have with update - in my old setups I used to put "27.5/300" type of information in Shock Oil as it was just text information and didn't really matter to have precise cst number in there. Now, with V.4.2, when I try to load old setups, it shows error and does not load it correctly. Error is fine. But would be nice if it would just ignore or "empty" wrong field (Shock oil), but still load the rest. Thank you!

icecyc1

What I like to do is use the Damping Ratio shown in the chassis setup/shocks setting tab. First put in your 1.1x4 with 300, see what that damping ratio number is. Then choose the 1.6x2 pistons. Next, change your oil until you get the same Damping Ratio number. That should give you the same feel. (for low speed, or handling)

One thing to add... the pack will be different between the two pistons (most likely), so you will want to go to the Damping tab, and look at the Damping Ratio graph. Choose both pistons by ctrl-clicking each one to highlight them in blue. Choose your range of viscosities to try match what you had for each piston (since you can't put a separate viscosity for each piston) so the values land on your oils you found to match damping ratio from the first part. The low speed damping, (what you just adjusted using the above steps) should be the same at the 200mm/s area, because that is the region the Damping Ratio number is calculated. Now, to figure out the pack, look at the 2000mm/s area, and one piston/oil combo should be higher than the other, that's the one that has more pack.

You could also get the pack difference by looking on the Dynamic Response tab, and actually entering both piston/oil combinations as Current Setup, and Test Setup. Then, choose a medium jump for the graph (instead of a sine wave... sine wave should be overlaying if you matched them properly). The piston that dips lower, indicates it has less pack, as the graph shows the chassis height off the ground during jump landing.

maris

That worked out nicely. Had to add two pistons in chases manager. After that could select diffrent pistons in Setup and change oil Cst to match Damping Ration. Found out it's about 650Cst with 2 x 1.6 what sounds about right. (BTW, it's interesting observation how much smaller holes make a difference. Both 1.1 x 4 and 1.6 x 2 have about the same total hole surface area)

After that plaid with Graphs in Damping Tab. Very cool! As you mentioned graphs looked very similar. I didn't knew to look at high speed settings particularly. But now, when I try to enter Damping, I have error:

---------------------------
Main Page
---------------------------
Sub DmprDeriv error
Index was outside the bounds of the array.
---------------------------
OK
---------------------------

Bob, could you look into that? Or maybe easy workaroud? (I have two pistons configured for the chases)


Maris

maris

Just quick replay to say that I figured out how to get rid of error - had to go in Chasses manager and fix shock lenght and resave both fron/rear shock setups. Then also resave piston selection in Setup.

Did try different things in Damping Ratio graph. But I couldn't get nice line that is similar in low velocities and changes in high. In my case it is more like two linear lines - one lower, another higher. Interestingly in my setup 2 hole pistons have higher pack. I was expecting reverse. Also, for front, graph ends around 200mm/sec for some reason, see attached picture. Also it looks like my current is quite "overdumped". It's on carpet with jumps and I kind of like it this way.

In general, my suggestion would be to either add Damping Ratio as 3rd graph option to Dynamic response tab graphs or revork/add option, to just display two graphs in Damping Ratio tab. Each graph different piston/oil combination as in Dynamic Response case.

But all in all very nice tool to play with and to understand better effects of different oils/pistons.

icecyc1

Yes, that is what I have found to be interesting in my testing... fewer holes = more pack if you equalize the low velocity damping. Bob's modeling confirmed/matched that result. In other words, less holes = larger difference between low velocity and high velocity damping; more holes = less difference between low velocity and high velocity damping. The size of the holes doesn't seem to affect that ratio as everyone has assumed.

truggy100

can you use rc crew chief for 1/12 scale pan car ?

BobW

iTrader: (1)

Sorry no. It is designed around double 'A" arm independent suspension.