SouthernComfort
Quarry Creeper
Whats your final drive ratio on your rig ?
Also tire size as that effects the outcome. .
Also tire size as that effects the outcome. .
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Whats your final drive ratio ?
- Thread starter SouthernComfort
- Start date
TacoCrawler
I wanna be Dave
47.2:1
stock SCX-10 factory drive train 87/14
3s LiPo / 55T mtr.
I have not calculated how my current 4.25" (1.9) tires
affect the over-all ratio.
I generally roll 4.19" - 4.30" (1.9) tires
my top speed is maybe 4 - 5 mph
stock SCX-10 factory drive train 87/14
3s LiPo / 55T mtr.
I have not calculated how my current 4.25" (1.9) tires
affect the over-all ratio.
I generally roll 4.19" - 4.30" (1.9) tires
my top speed is maybe 4 - 5 mph
GraniteBandit
Quarry Creeper
Toyota Land Cruiser BJ, ~300:1
SCX10 Hilux truggy, ~200:1
Trail Finder 2, ~140:1
Jeep Wrangler ... coming
I love super slow rock crawling like what you'd see in California (Fordyce Creek, Rubicon, Duzy Ershim Trail, Sledgehammer).
The Land Cruiser, SCX10 and Jeep are running worm drive axles with a ratio of 25:1 ... the Trail Finder is running a 2:1 gear reduction unit between the motor and trans. $10 brushed motors in all running 7.2v
Occasionally I get passed by ants.
SCX10 Hilux truggy, ~200:1
Trail Finder 2, ~140:1
Jeep Wrangler ... coming
I love super slow rock crawling like what you'd see in California (Fordyce Creek, Rubicon, Duzy Ershim Trail, Sledgehammer).
The Land Cruiser, SCX10 and Jeep are running worm drive axles with a ratio of 25:1 ... the Trail Finder is running a 2:1 gear reduction unit between the motor and trans. $10 brushed motors in all running 7.2v
Occasionally I get passed by ants.
Last edited:
SouthernComfort
Quarry Creeper
Dear God man... 300:1...
GraniteBandit
Quarry Creeper
I hear ya. It's ridiculously slow. That one is running the RC4WD R2 transmission and Worminator axles. Eventually the R2 is coming out and getting replaced with the R3 single speed and a 1:1 xfer case.
Rowdy_Giff
Newbie
How do you calculate this?
Calderwood
I wanna be Dave
Multiply each ratio by the last.
My 1:1 Toyota has a 210:1 crawl ratio :mrgreen:. I've never calculated my rc ratios.
Rowdy_Giff
Newbie
So (spur/pinion) x trans ratio x xcase ratio x axle ratio = final drive?
Calderwood
I wanna be Dave
Yes.
chino63
Oppan Gangnam Style
Yup "thumbsup"
SouthernComfort
Quarry Creeper
Im looking at 116:1 with Traxxas Summit wheels.. at about 7-8 pounds im told a 3800kv 4 pole brushless motor wont have the power... and im thinking with that gearing it wont be all jerky at start up ..
I do have my sights set on a M775 gear motor setup with 20:1 that ends up being 99:1 but thats all with a 1:1 from the gear box to the center shaft..
I do have my sights set on a M775 gear motor setup with 20:1 that ends up being 99:1 but thats all with a 1:1 from the gear box to the center shaft..
meatmonkey
I wanna be Dave
I run all three of my SCX's with a 12 tooth pinion and 87 tooth spur on 1.9 tires ranging from 4.19 to 4.6" tall. Trucks range from 4.5 to 7 pounds in weight.
Comes out to a 56:1 crawl ratio. It's sufficient for precise low speed crawling with cheapo closed endbell 27 turns and 2s power.
IMO you need at least 30:1 to do any real crawling, and anything deeper than 100:1 would be annoyingly slow.
Comes out to a 56:1 crawl ratio. It's sufficient for precise low speed crawling with cheapo closed endbell 27 turns and 2s power.
IMO you need at least 30:1 to do any real crawling, and anything deeper than 100:1 would be annoyingly slow.
