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Forum: I Made This ! 05-03-2015
Replies: 3
Views: 1,452
Posted By Erik Brewster
I love your workshop!

I love your workshop!
Forum: I Made This ! 26-02-2015
Replies: 21
Views: 4,635
Posted By Erik Brewster
Looking good! Can't wait to see it with pretty,...

Looking good! Can't wait to see it with pretty, cut edges and holes.

It's funny - carbon chassis with foam sandwiches, molded kickups, and other advanced stuff were so normal in the 80's but not...
Forum: I Made This ! 23-02-2015
Replies: 2
Views: 2,572
Posted By Erik Brewster
I've found that in 17.5 classes, the motors get...

I've found that in 17.5 classes, the motors get pretty hot because gearing them up and using all the timing advance available is critical to getting good performance. There are certainly other...
Forum: I Made This ! 23-02-2015
Replies: 2
Views: 2,572
Posted By Erik Brewster
B5M Chassis Brace With Fan Mount

The B5M has a problem with motors getting hot (compared to the rear motor version) because the chassis mount blocks airflow to the motor, when the motor temp is marginal. Making one with a fan mount...
Forum: I Made This ! 16-12-2014
Replies: 14
Views: 2,540
Posted By Erik Brewster
This makes sense. I didn't read it that way the...

This makes sense. I didn't read it that way the first time.

Sorry for the rough tone in my first response. I shouldn't be allowed to post before coffee in the morning...
Forum: I Made This ! 16-12-2014
Replies: 14
Views: 2,540
Posted By Erik Brewster
I started with this idea in my car, but reality...

I started with this idea in my car, but reality is more complicated than this, unfortunately. I am now trying to figure out when flex is good and how much is good. I haven't seen much clear...
Forum: I Made This ! 16-12-2014
Replies: 14
Views: 2,540
Posted By Erik Brewster
Go with 7075. It is twice as strong (503 vs 276...

Go with 7075. It is twice as strong (503 vs 276 MPa Yield strength). It is the same stiffness, (71.0 vs 68.3 GPa). It has a poor rating for workability (bending), but I have made chassis with 25...
Forum: I Made This ! 28-10-2014
Replies: 46
Views: 12,535
Posted By Erik Brewster
If someone is interested in the diff idea, he...

If someone is interested in the diff idea, he should probably look at a Losi Hydra drive.
Forum: I Made This ! 17-09-2014
Replies: 10
Views: 2,359
Posted By Erik Brewster
I REALLY like your project. It actually got me...

I REALLY like your project. It actually got me talking to people to see what I could scrounge up to make a project like that. I have a leftover B5R chassis and a Durango DESC410 rear end sitting on...
Forum: I Made This ! 17-09-2014
Replies: 10
Views: 2,359
Posted By Erik Brewster
I do use the 3 gear transmission. I think it...

I do use the 3 gear transmission. I think it drives well, but my driving ability limits how well I can tell. I'm typically back of the A main level at my local club (before and after making my own...
Forum: I Made This ! 17-09-2014
Replies: 10
Views: 2,359
Posted By Erik Brewster
That is a very doable project. It's a bit of an...

That is a very doable project. It's a bit of an old picture; the fan was cooling a 17.5 motor that had seen better days. I have a new motor in there now and cooling isn't much of an issue. I do use a...
Forum: I Made This ! 17-09-2014
Replies: 10
Views: 2,359
Posted By Erik Brewster
Just a bunch of thoughts with no particular...

Just a bunch of thoughts with no particular overall message:

Using carbon is interesting to me -- I have made some carbon things, years ago, but it's been a while. When I look at carbon, I see two...
Forum: I Made This ! 16-09-2014
Replies: 10
Views: 2,359
Posted By Erik Brewster
Here is my original plan to make a fully printed...

Here is my original plan to make a fully printed chassis. The chassis broke in the middle (delamination of layers). Eventually, I bonded thin aluminum sheet to the top and bottom. The failures just...
Forum: I Made This ! 15-09-2014
Replies: 10
Views: 2,359
Posted By Erik Brewster
My B4M

I made a mid motor conversion of my B4.2. It started out as a fully printed chassis, but I could never get it durable enough. After many revisions, I ended up making something like my own Centro......
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