Thumper's and Morrigan's Transmission Shop for 1:8 Scale Rock Crawler by Black Crow

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These transmissions are intended for use with “Thumper” and “Morrigan” 1:8 scale models.

Thumper - https://www.printables.com/model/323433-thumper-18-scale-rc-cj7-rock-crawler-by-blackcrow

Morrigan- https://www.printables.com/model/492423-morrigan-rc-car-remote-control-rock-bouncer-crawle

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You have options!

I have four tested 3D printed gear builds below. Metal gear transmissions are also available for stronger longer lasting builds.

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A) Rock Crawler build - (A) This build is only for rock crawlers. It is light, low geared and easy to control. It uses a D3530 1,100KV motor with a 30amp ESC or a D3542 1,000kv motor with a 60Amp ESC. This setup has a 32:1 gear ratio at the tires. Not much motor back spin on his model. The down side is speed. The speed is good enough for walk behind trail rock crawling. Not a basher. Reducing acceleration and braking in transmitter is recommended.

Note: The D3542 1,000kv motor requires a 60Amp ESC. On the Thumper model space is limited between the radiator and motor. The Alomejor pictured fits on it's side with fan facing radiator. The aviation motor comes with 3.5mm banana connectors. Waterproof 60Amp 1:10 scale Car ESCs come with 4mm banana connectors. Converting the connectors will be necessary. It is strongly recommended that you use an Orange “FLASH HOBBY” BRAND D3530 or D3542 three screw motor. The other motors do not benefit from a center shaft causing resulting in possible vibrations.

-For Rock Crawler Build with Flash Hobby D3530 - 1,100kv Print A and AA parts-

-For Rock Crawler Build with Flash Hobby D3542 - 1,000kv Print B and AA parts-

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New: (G) 540 option - (Not compatible with Morrigan) For the serious crawlers that say brushless motors can't compete with brushes, new motor plates have been added to include the use of 540 motors. Do NOT choose this option unless you have crawling experience. Brushed motors require more maintenance.

Replace A or B : Bearing plate, Front cover, Motor plate and motor gear with G Bearing plate, Front cover, Motor plate and motor gear. (You have the option of using a 5mm flange with 3.175 to 5mm shaft sleeve or a 14 tooth pinion gear To attach the motor gear to 540 motor.)

Thumper Model: The 540 motor setup is longer and takes up space previously used by the ESC. You will have to remove the ESC mount and relocate the ESC to fender. The 550 is too long unless you remove the radiator. (currently looking into options)

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B) Rock Crawler/Basher build (B) (Use the 1,450 video for both 1,000kv and 1450kv)

This build uses (Fast) D3542 1450kv or (slower but still much faster than A transmission)D3542 1000kv motor. These builds are more of a basher than a climber yet you can still crawl with them. The Motor/Transmission is easy to build and swap out. Options are nice and if you are short on rocks to climb, this setup is more fun. Reducing acceleration and braking in your transmitter is a must . The Rock Crawler Build is better crawler and the Basher build is a much better Basher . Might be best build for snow and mud.

Note: The D3542 1,000kv motor requires a 60Amp ESC. Space is limited between the radiator and motor. The Alomejor pictured fits on it's side with fan facing radiator. The aviation motor comes with 3.5mm banana connectors. Waterproof 60Amp 1:10 scale Car ESCs come with 4mm banana connectors. Converting the connectors will be necessary.

It is strongly recommended that you use an Orange “FLASH HOBBY” BRAND D3542 three screw ORANGE MOTOR Jan 16 2023

Fast -For Rock Crawler/Basher Build With Flash Hobby D3542 - 1,000kv Print B and BB parts-

Faster -For Rock Crawler/Basher Build With Flash Hobby D3542 - 1,450kv Print B and BB parts-

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C) Basher Build - (C) This build uses a 4250hobbyhh motor and 80amp ESC. This build is worthless as a crawler. Too much motor back spin. It is fast and powerful. …It takes a bit of skill to keep the rubber side down. I came up with this setup to break the model and show weak spots. To my surprise the model held up. I broke two front spindles but only after running into the brick flowerbed at 70% speed. No damage to metal parts. just print and replace. This build shows obvious power increase when running two parallel batteries instead of just one. Summery: The chassis was designed to be a slightly top heavy rock crawler not an extremely top heavy race car yet the basher setup is still lots of fun! … THIS BUILD REQUIRES THE “Hobbyhh 4250 800kv" Notify me if you have another brand 4250 800kv motor that I can readily purchase and I will adapt to it. Jan-16-2023

-For Basher Build with Hobbyhh 800kv motor Print C and CC parts-

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--------Crawler and Crawler/Basher---------

Parts for D3530 or D3542 Builds: Links are US Amazon Affiliates

ESC:

D3530 30Amp Waterproof ESC https://amzn.to/4pTkzyf

D3542 60Amp Waterproof ESC ("Alomeajor" brand fits on it's side, Will need to change banana connectors) https://amzn.to/49ugkzX

Motor options:

Flash Hobby (D3530 1,100kv Motor) - Crawler https://amzn.to/4aH3ob2

Flash Hobby (D3542 1,000kv Motor) - Crawler https://amzn.to/3Kzrixh

Flash Hobby (D3542 1,450kv Motor) - Crawler/Basher https://amzn.to/48eqCXZ

Belts: 4 belts - 144 3M 6mm (3M144-6) https://amzn.to/49FlwAN

Bearings:

Flash hobby motor

9 - 5x11x4 bearing https://amzn.to/3VTBK68