My brushless Revo

[Finnster]

Hey all. Actually UHMWPE (ultra-high Molecular Weight Polyethylene) is not nylon, that is a different plastic. Unfortunately it does not dye easily like nylon, it is more like polyester, which requires a "disperse dye" and not a simple acid bath dye like RIT. The procedure is simular, but requires an extra activator chemical to be boiled with the plastic. It can be done, just a bit more trouble. I did read somewhere that some use crayons for fabric, then use heat transfer to dye the materials, but the angle shape would be difficult to do this way. ProChem USA has dyes that will do this. ~$5-10 total. Shoot, looks like the only real drawback to this, but I don't really care about the color.

I have to make some corrections to the specs, I needed to look at my notes. UHMWPE is about half the weight of CF. ~.95g/ml, ie lighter than water (floats.) CF is ~1.75g/mL, 6061 is ~2.7g/ml and Titanium is ~4.7g/ml. Steel was 7.5-8 g/ml or so.

If you wanted to screw directly into the plastic you wouldn't want to use machine screws, but more like self tapping sheet metal screws that have a much bigger bite. I have all my screws going into SS standoff nuts and are recessed flat head screws. You can just see the standoffs in pic 3, they go through the 4mm bolt holes in the chassis and provide a 4-40 thread for the screws. There is no way they are coming out. MMC also has 2"x1" U-channels if you wanted to guard both sides of the batt, but the way the batt sits and the extra strap IMO are more than sufficent. The batts are shrinkwrapped, but I did have an experience where a batt shorted on a Alu Emaxx chassis I do not want to repeat.:eek:

Lastly, I don't think the plastic is oil-impreged. Some nylon is, but this is approved for 3A sanitary/FDA usage (dairy and food contact.) It is very slippery tho, close to teflon. This is often used as machinery guardrails, slides and such.

No one else on pinion rec's? 15t it is then? Ack, I need to do some more research. Brian, you had bigger tires on yours w/ the 14t as well, correct?

[BrianG]

Originally Posted by Finnster

Lastly, I don't think the plastic is oil-impreged. Some nylon is, but this is approved for 3A sanitary/FDA usage (dairy and food contact.) It is very slippery tho, close to teflon. This is often used as machinery guardrails, slides and such.

Yeah, that's what it looked like - the stuff restaurants use as a food prep surface/cutting board. I was thinking of the Subway food prep area when I saw that.

Originally Posted by Finnster

Brian, you had bigger tires on yours w/ the 14t as well, correct?

Actually, my tires were the standard size, just heavy due to the tread design. The whole truck was heavier due to material choices, and I used 14T. My truck was a little over 14lbs with 14 GP3300 cells. I'd increase a tooth for every two pounds lighter than 14. So, if you are at 12lbs loaded, I'd try a 15T. When I went with 15T, my ESC heated up more, so it should be just about right if yours is lighter. If you had the cash, I'd say get a 15T and a 16T, but I think 15T will be just about right for that motor.