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Search: Posts Made By: ffreitas
Forum: LeViteZer 2015.05.05, 09:18 PM
Replies: 7
Views: 1,727
Posted By ffreitas
Great work!

This is one of the most insightful innovations I have seen in mini-z telemetry. And with no additional harware besides a camera and a (powerful) computer...

Basically any relevant measurement...
Forum: Lap Timing Systems and Software 2013.05.06, 02:20 PM
Replies: 6
Views: 1,011
Posted By ffreitas
There is a discussion of this possibility towards...

There is a discussion of this possibility towards the end of this thread: http://mini-zracer.com/forums/showthread.php?p=431768&highlight=sector#post431768
Forum: Lap Timing Systems and Software 2013.05.06, 02:18 PM
Replies: 6
Views: 1,011
Posted By ffreitas
We tried Zround with I-LapRC Race Timing System...

We tried Zround with I-LapRC Race Timing System (www.rclapcounter.com) and could make it work by connecting several sensors to each other and positioning them in different parts of the track. The...
Forum: Setups 2013.01.09, 07:21 PM
Replies: 26
Views: 1,346
Posted By ffreitas
Hi, I have been running a Mazda 787b for a...

Hi,

I have been running a Mazda 787b for a couple of years in our club LM class.

I use the PN Racing reconfigurable motor mount (part number MR 2999) with the LM carbon fiber set (part number...
Forum: ZRound 2012.11.12, 08:30 PM
Replies: 13
Views: 1,238
Posted By ffreitas
Is there a way to change the number of decimal...

Is there a way to change the number of decimal places read out by ZViewer when using the text to speech option?
Forum: ZRound 2012.10.19, 06:49 PM
Replies: 13
Views: 1,238
Posted By ffreitas
Jesus, Is it possible to add an individual...

Jesus,

Is it possible to add an individual driver lap time call out option to Zviewer?

What I would like to do is to pair a bluetooth headset to a notebook running Zviewer (properly connected...
Forum: Special Topics 2012.06.24, 02:07 PM
Replies: 9
Views: 2,226
Posted By ffreitas
Another aspect of truing your (rear) tires that...

Another aspect of truing your (rear) tires that is not mentioned that often is the effect on the "gear" ratio and its implications for torque and speed. Essentially, running a 22 mm sized rear tire...
Forum: ZRound 2012.03.26, 06:37 PM
Replies: 26
Views: 1,369
Posted By ffreitas
We have done that without the need for more than...

We have done that without the need for more than 1 lap counting system, or at least not a full additional system. What we did (using I-Lap Timing System) was to position three sets of 2 sensors each...
Forum: Videos 2012.03.20, 05:07 PM
Replies: 3
Views: 1,248
Posted By ffreitas
I used a 808 #11 (720p) Key Chain Camera for the...

I used a 808 #11 (720p) Key Chain Camera for the on board shots. Check out this site http://chucklohr.com/808/ for (a lot) more info on the camera. Make sure you look at the links to rcgroups thread...
Forum: Videos 2012.03.18, 12:39 AM
Replies: 3
Views: 1,248
Posted By ffreitas
Slow Motion Videos

I have made two cool videos of Mini-Zs racing on our track.

http://www.youtube.com/watch?v=uphpxqlDiFw

http://www.youtube.com/watch?v=3iGqsxMvGKs

Check them out.
Forum: Beginner Questions 2012.01.25, 10:23 AM
Replies: 5
Views: 458
Posted By ffreitas
If you want to go fancy you can try Muchmore...

If you want to go fancy you can try Muchmore bearing removal tool. They are expensive and work only ok, but I believe their design minimizes chances of scratching the bearing inner surface. They seem...
Forum: Mini-Z Racer MR-03, MR-03 VE, Sports Series, EVO 2011.12.21, 08:45 PM
Replies: 9
Views: 788
Posted By ffreitas
We ruan a very competitive LM class in our club,...

We ruan a very competitive LM class in our club, and may be able to help.

On the rear part, go with the recently released PN LM mount. it's actually a variation of their adjustable carbon/alu...
Forum: Custom Bodies 2011.10.07, 01:13 PM
Replies: 30
Views: 1,877
Posted By ffreitas
There is an older technique that used to be very...

There is an older technique that used to be very popular in the tropical rain forest portion of South America. I'm not sure it would work with Mini-Z bodies though: en wikipedia org (http://en...
Forum: Mini-Z Science 2011.08.05, 02:01 PM
Replies: 42
Views: 3,065
Posted By ffreitas
Test what?

If you guys were willing to do more tests what would you try? Additional wing configurations and positions? Rear/front diffusers? Flat underbody? Front splitters? Difference among several different...
Forum: New Products 2011.08.02, 09:36 PM
Replies: 224
Views: 22,615
Posted By ffreitas
HSV-010 Pictures

I wasn't sure which one to get...

I'm not sure where those extra 5g are going to come from...
Forum: Mini-Z Science 2011.07.29, 05:30 PM
Replies: 42
Views: 3,065
Posted By ffreitas
Mini-Z Featured at Symscape's Page

A summary of our Mini-Z CFD study was featured at the Symscape's home page. Symscape is the publisher of Caedium, the software used to perform the analysis.

CHeck it out at:...
Forum: Mini-Z Science 2011.06.04, 05:35 PM
Replies: 42
Views: 3,065
Posted By ffreitas
Yes, that's what I used, why? Have you used it...

Yes, that's what I used, why? Have you used it before?
Forum: Mini-Z Science 2011.06.04, 01:15 PM
Replies: 42
Views: 3,065
Posted By ffreitas
I apologize but it may not be possible to test...

I apologize but it may not be possible to test additional configurations as you guys suggest, at least for a while: the free trial of the CFD software expired!

I did have the time to produce some...
Forum: Mini-Z Science 2011.06.02, 10:45 PM
Replies: 42
Views: 3,065
Posted By ffreitas
Scoop wing, gurney flap, and even a broken wing...

That's it! By popular demand, here are the latest results, including the simulation of a scoop wing, a gurney flap, and a "broken" flat wing.

Configuration: Drag (gf), Down Force (gf)
No Rear...
Forum: Mini-Z Science 2011.05.30, 04:53 PM
Replies: 42
Views: 3,065
Posted By ffreitas
I was hoping that the experts (you guys) could...

I was hoping that the experts (you guys) could help interpreting and explaining the results :). I'm way out of my league here...

I believe what you are referring to is just the transition from the...
Forum: Mini-Z Science 2011.05.29, 11:07 PM
Replies: 42
Views: 3,065
Posted By ffreitas
CFD Results: No Wing - 0 - 15- 30 - 45 - 60 Degree Rear Wing

I completed the series of CFD simulations, with "no wing" and for 0 - 15 - 30 - 45 - 60 degree rear wing.

Results are:

Configuration: drag, down force
No Rear Wing: 6.2, -7.8 (lift)
0 Degree:...
Forum: Mini-Z Science 2011.05.27, 09:05 PM
Replies: 42
Views: 3,065
Posted By ffreitas
Results for 15 Degree Wing

Results for 15 and 30 degree angle rear wing are in.

For a 15 degree angle rear wing, at 10 m/s (36 km/h), the simulation indicates 7.7 gf of drag and 4.6 gf of down force.

For the 30 degree...
Forum: Mini-Z Science 2011.05.22, 08:45 PM
Replies: 42
Views: 3,065
Posted By ffreitas
New Results: No Wing vs. Flat Wing vs. 45 Degree Wing

I concluded some additional simulations, comparing drag and down forces for three different rear wing configurations: no wing, flat wing, and 45 degree wing.

The results were the following:

-...
Forum: Mini-Z Science 2011.05.16, 12:32 AM
Replies: 42
Views: 3,065
Posted By ffreitas
The "lower wing element" shown in the proof of...

The "lower wing element" shown in the proof of concept was there just because I didn't want to ruin my Mazda 787 body! :) Never thought of actually implementing it there, for all the reasons exposed...
Forum: Mini-Z Science 2011.05.15, 11:31 PM
Replies: 42
Views: 3,065
Posted By ffreitas
More CFD simulation results

I was able to run the simulation on a more detailed, although still rough, model. This time instead of a solid block (like the previous model) I considered the body as a shell and included the main...
Showing results 1 to 25 of 31

 
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