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Search: Posts Made By: BobW
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12-27-2018, 09:16 AM
Replies: 754
Views: 113,571
Posted By BobW

The default points represent all the positions...

The default points represent all the positions for the front and rear blocks assuming the pin is located in the same location front and rear. If you are using different blocks for the front/rear then...
12-27-2018, 05:56 AM
Replies: 754
Views: 113,571
Posted By BobW

The points represent the different position for...

The points represent the different position for the hinge pin inserts. If you double click the image you can zoom in to see more detail. You can also add more points using the chassis...
12-20-2018, 01:45 PM
Replies: 754
Views: 113,571
Posted By BobW

If you can accurately measure the rate that would...

If you can accurately measure the rate that would definitely be the value to use.

Most springs are made from high carbon steel or music/piano wire. There are lots of other materials that can be...
12-20-2018, 07:11 AM
Replies: 754
Views: 113,571
Posted By BobW

Normally the spring rate calculator is within 10%...

Normally the spring rate calculator is within 10% of the actual rate. The easiest thing to get wrong is the number of "Active" coils. I just measured up a AE yellow spring with total of 5.25 coils....
12-01-2018, 06:29 AM
Replies: 292
Views: 46,354
Posted By BobW

Dave-man is looking for help with the MD2...

Dave-man is looking for help with the MD2 flywheel dyno. It outputs power, torque and current vs RPM. What you are suggesting would require using a load dyno which is a different beast.
11-30-2018, 09:05 PM
Replies: 292
Views: 46,354
Posted By BobW

The results in the post you are referring to are...

The results in the post you are referring to are normal for the MD2. If you post the output file I can tell you very quickly if the numbers make sense.

You can also import the file into excel and...
08-05-2018, 07:59 AM
Replies: 292
Views: 46,354
Posted By BobW

I have been doing lots of Dyno testing lately...

I have been doing lots of Dyno testing lately with the Arduino MD2 and thought some may find the results interesting. There are 4 Youtube videos that can be accessed from the RC3 website ...
04-14-2018, 07:43 PM
Replies: 100
Views: 12,862
Posted By BobW

If you want email me a data file I'll see if I...

If you want email me a data file I'll see if I can process it. Send it to [email protected]
04-14-2018, 09:27 AM
Replies: 100
Views: 12,862
Posted By BobW

Inertia will only affect the spin up time of the...

Inertia will only affect the spin up time of the flywheel. Couple things it could be, correcting RPM for your pulley ratio or the voltage you are testing at. Image below is a 13.5T motor tested with...
02-26-2018, 02:51 PM
Replies: 754
Views: 113,571
Posted By BobW

What kilohertz said. To include chassis...

What kilohertz said.

To include chassis flex would mean doing bending and torsion testing of every chassis produced. Not something that will ever happen.
02-17-2018, 04:23 PM
Replies: 292
Views: 46,354
Posted By BobW

For those who may be interested I have uploaded...

For those who may be interested I have uploaded files and instructions to the RC3 website for the DIY MD2 Dyno Mod. I have been playing with this for some time and have made improvements to RPM,...
11-10-2017, 05:49 AM
Replies: 754
Views: 113,571
Posted By BobW

Yes that is the workaround for the time being....

Yes that is the workaround for the time being. Single bell crank is on the list for a future version.

I will add a lower limit to the Xb permitted range.
11-06-2017, 05:31 AM
Replies: 754
Views: 113,571
Posted By BobW

Shorter camber links will increase the camber...

Shorter camber links will increase the camber gain and raise/lower the Roll Center depending on the angle difference between the camber link and the lower arm. Unlikely it will account for the...
11-04-2017, 07:06 AM
Replies: 754
Views: 113,571
Posted By BobW

I had a look at the roll sensitivity issue. I...

I had a look at the roll sensitivity issue. I imported the T3 model from the website and the roll sensitivity for the included setups is in the .9 to 1.2 range. For you to be seeing values in the...
10-17-2017, 05:26 AM
Replies: 754
Views: 113,571
Posted By BobW

I have no problem providing the details of what I...

I have no problem providing the details of what I have done. Just need to sit down and document it in a form that would be understandable. I have a CAD drawing of the mods I made to the dyno which...
10-17-2017, 05:14 AM
Replies: 754
Views: 113,571
Posted By BobW

No problem hope it helps. If you want the Dyno...

No problem hope it helps. If you want the Dyno Sim model I have been using just send me a email and I'll send you the Motor and car models. Should help take some guess work out of what you are doing....
10-16-2017, 11:29 AM
Replies: 754
Views: 113,571
Posted By BobW

Couple things. You want to target the Mass Moment...

Couple things. You want to target the Mass Moment of Inertia (MMI) not just the Mass. The MMI is what determines how much resistive load the motor must accelerate. Yes mass is part of it but the...
10-15-2017, 08:19 PM
Replies: 754
Views: 113,571
Posted By BobW

Perfect you should have no problem importing the...

Perfect you should have no problem importing the data into RC3 then. What is the sample rate and spin up time with your rig?

I originally thought of doing a geared dyno like the miniPRO but now I...
10-15-2017, 03:22 PM
Replies: 754
Views: 113,571
Posted By BobW

Very nicely done. If you want power and torque...

Very nicely done. If you want power and torque numbers at the motor you will need to divide the chassis dyno flywheel inertia by the Overall Gear Ratio squared.

To get real anal the losses due to...
10-05-2017, 05:54 AM
Replies: 292
Views: 46,354
Posted By BobW

There is no link this is just one of my little...

There is no link this is just one of my little projects and it is still very much a work in progress. I'm hoping to integrate it completely into RC3 some day.

It's a little cumbersome right now as...
10-04-2017, 04:22 PM
Replies: 292
Views: 46,354
Posted By BobW

I blew a few fuses when I first started using the...

I blew a few fuses when I first started using the MD2. If I recall that was when I tried testing with dual batts. Even a 21.5 turn will draw 60-70 amps at start up so the 30amp fuse may not be...
04-11-2017, 05:58 AM
Replies: 754
Views: 113,571
Posted By BobW

Had a quick look through and you are right the...

Had a quick look through and you are right the front suspension geometry does not look correct. Normally the front and rear dimensions are very similar for a TC. It looks to me the problem is in the...
04-06-2017, 08:17 PM
Replies: 754
Views: 113,571
Posted By BobW

That will work fine. The model entered in the...

That will work fine. The model entered in the Chassis Manager is the reference geometry for everything. When you change tire diameter, ride height or anything else on the setup page the program...
03-30-2017, 03:18 PM
Replies: 754
Views: 113,571
Posted By BobW

I would run lower roll centers and less camber...

I would run lower roll centers and less camber gain. In other words a higher Roll Sensitivity. Reason being this increases the amount of chassis roll and the amount of camber change the tire would...
02-16-2017, 07:27 AM
Replies: 754
Views: 113,571
Posted By BobW

XRAY T4 '17 model is now available on the on road...

XRAY T4 '17 model is now available on the on road model download (http://www.rccrewchief.wrightdesign.ca/OnRoadDownload.aspx)page.
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