Seattle RC Racers/Hangar 30
On this class does it matter what 25.5 motor I buy?
USGT: 1/10th scale electric chassis. 5mm minimum ride height. Motors: Tamiya 540 silver can; outdoors at Seatac R/C Raceway–ROAR-approved 21.5 brushless, OEM rotors only ; indoors at Hangar 30–ROAR-approved 25.5 brushless, OEM rotors only. ROAR-approved non-timing ESC for brushless motors. Tires for all venues: Gravity RC USGT pre-mount. Current allowed bodies here: USGT rules ROAR-approved 7.4V 2S lithium technology batteries. 4WD: 1350g minimum weight. FWD: No minimum weight; hatchback bodies only. Scale livery for all cars is encouraged. Racers are encouraged to operate both within the letter and spirit of the rules.
USGT: 1/10th scale electric chassis. 5mm minimum ride height. Motors: Tamiya 540 silver can; outdoors at Seatac R/C Raceway–ROAR-approved 21.5 brushless, OEM rotors only ; indoors at Hangar 30–ROAR-approved 25.5 brushless, OEM rotors only. ROAR-approved non-timing ESC for brushless motors. Tires for all venues: Gravity RC USGT pre-mount. Current allowed bodies here: USGT rules ROAR-approved 7.4V 2S lithium technology batteries. 4WD: 1350g minimum weight. FWD: No minimum weight; hatchback bodies only. Scale livery for all cars is encouraged. Racers are encouraged to operate both within the letter and spirit of the rules.
Tech Lord
iTrader: (86)
It's the final that matters.
You know how this goes though, if there is reason to doubt, someone will eventually grouse about it. That said, I'm not inclined to be held hostage by someone's mental or emotional limitations.
You are an experienced racer and I take you to be a fair minded competitor. We can put it in your hands to show up with a combo that hits the spec.
If someone has a bitch they can take it up with me at the track.
Tech Master
iTrader: (6)
Yep, if ya can hit 1.80...who cares. I can see someone complaining if someone shows up with 1.81, which for anyone who knows this motor knows it won't mean a damn thing. But in the spirit of rules...1.80 is the gearing. Hit it, you good.
There were a lot of unknowns speccing a specific spur and pinion. We were trying to follow what some of the big races had done...but I knew in the back of my mind that there would be some obscure car, or a total lack of parts availability and we'd be meeting this conversation all over again.
1.80 is good....which may be the Seahawks scoring average at the end of the season...go Hawks?!?!?
There were a lot of unknowns speccing a specific spur and pinion. We were trying to follow what some of the big races had done...but I knew in the back of my mind that there would be some obscure car, or a total lack of parts availability and we'd be meeting this conversation all over again.
1.80 is good....which may be the Seahawks scoring average at the end of the season...go Hawks?!?!?
Tech Adept
Tech Master
iTrader: (6)
Spur / Pinion
45 / 25
54 / 30
63 / 35
72 / 40
81 / 45
90 / 50
See the pattern?
For those more mathmatically minded....
Is the spur divisible by 9?
Is the pinion divisible by 5?
Is the pinion slightly more than half the value of the spur?
If all 3 are a go...their gear ratio is a go....
And as an added note...everyone at that group of tables is a special kind of worthy...ALL OF YOU...counting to 4 to ensure all the tires are on the car is an accomplishment....I'm waiting for the day someone forgets to put their body clips on...
Last edited by Carnage9270; 09-14-2022 at 09:51 AM.
Tech Elite
iTrader: (21)
Yep, if ya can hit 1.80...who cares. I can see someone complaining if someone shows up with 1.81, which for anyone who knows this motor knows it won't mean a damn thing. But in the spirit of rules...1.80 is the gearing. Hit it, you good.
There were a lot of unknowns speccing a specific spur and pinion. We were trying to follow what some of the big races had done...but I knew in the back of my mind that there would be some obscure car, or a total lack of parts availability and we'd be meeting this conversation all over again.
1.80 is good....which may be the Seahawks scoring average at the end of the season...go Hawks?!?!?
There were a lot of unknowns speccing a specific spur and pinion. We were trying to follow what some of the big races had done...but I knew in the back of my mind that there would be some obscure car, or a total lack of parts availability and we'd be meeting this conversation all over again.
1.80 is good....which may be the Seahawks scoring average at the end of the season...go Hawks?!?!?
Since we're talking FDR, yes, you are good to go.
So, to be really clear, the minimum FDR is 1.80000...
1.799999... is a no-go. I'm not going to argue. Just drop a tooth.
Divide spur teeth by pinion teeth. Minimum 1.8000....infinity.
The tire diameter is fixed, so we don't need to do mess with rollouts and all the fancy pi stuff.
Sidebar confession: After many years, my mind goes to rollout when thinking pan cars. My first limbic response was, "No way!" But then my frontal lobe engaged and slowed the roll: "Hey genius, it's FDR not rollout, and that rollout would be way to small, even if it is in inches." You're good, Pete.
Did I miss if the club has GT12 tires for sale?
Tech Lord
iTrader: (86)
thanks
Tech Rookie
Question
Do MRT transponders work with the clubs lap counting software? Thanks
R/C Tech Elite Member
iTrader: (28)