Nerobro

iTrader: (2)

Aluminum screws are in the plans... for the bits that can't be glued effectively. But we'd be talking a few tenths of a gram of epoxy would replace 13 screws. Each screw is worth around .8 grams.

Speaking of which. For 32mm turnbuckles. The aluminum version is .9 grams lighter than a steel turnbuckle. ..... I shouldn't have bought aluminum turnbuckles. That's totally not worth the dollars per gram.

The gear cover is 4.1 grams. The two screws are .5g each. So... 5.1 grams for ditching the gear cover.

Papi

If you plan driving without cover, maybe you could also shave excess metal from motor mount.

fyrstormer

iTrader: (1)

Aren't there minimum weight limits for racing classes? What's the point of chasing the lightest possible car?

Nerobro

iTrader: (2)

Yes, there are, for most classes. But not for USGT FWD cars.

http://www.usvintagetransam.com/rule...s7-20-2017.pdf

fyrstormer

iTrader: (1)

Huh. What a strange exception to a well-established pattern.

Nerobro

iTrader: (2)

The previous rule gave like a 100g advantage to the FWD cars. It seems.. that wasn't enough. As nobody ran FWD. Now, there's a huge loophole. I want exploit it. Bad.

patorz31

You can build a FWD car light mine (Not a FF03) is down to 900g, problem is once its real light getting enough bite with the USGT tires to compete coming out of the corners is an issue. If they'd let FWD run open slicks against the 4wd cars on USGT tires it will compete. A soft slick on the front is the way to go.

Nerobro

iTrader: (2)

it's going to have some adverse effects on initial steering, but setting up the car with a big front weight bias might help that. Then again, FWD is FWD. The place a ultralight car should "win" is in braking zones and in cornering.

Any downforce you get, is going to have a larger effect. Lower tire loading means you can corner faster. Lower weight, also means you can gear higher, so there may be a top speed advantage.

patorz31

I have a 75/25(F/R) weight bias on mine now. It has more weight up front then you can get on the FF03, it has anti-lift in it. It still gets killed off the line and out of slow corners.
Brakes on a FWD are not the best thing heavy braking will give you a bad push. If the course is flowing and has large radius curves it works great. If it has a couple of sharp 90s or god forbid a 180, then the old shaft drive Awesomatix will kill it and that's with Alberta Scale Spec rules of 4wd weighing 1450g and FWD having no weight limit.

Nerobro

iTrader: (2)

What chassis are you running? What's yours weigh?

patorz31

A hacked up MTS FF pro. It weighs 926g. I have couple of FF03 and and FF04. Everything is near the front.

fyrstormer

iTrader: (1)

I wonder what the rules would make of my part-time-4WD XV-01.

wtcc

iTrader: (2)

I invested in blue (aluminium) gold from Hiro Seiko and black (rubber) gold from Sorex to reduce the RTR weight from 1080g to 1040g.



Chassis weight with mostly steel screws...


... and with all but five aluminium screws:

Nerobro

iTrader: (2)

Nicely done. :-) What class do you run it in?

tobyzhang

iTrader: (15)

you might want to check the Ackerman if you setup the steering this way. Otherwise the design looks impressive.