LibertyMKiii's dream speed build (shooting for 200+mph)

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LibertyMKiii

RC Newbie
Messages
12
Location
Dallas TX
RC Driving Style
Bashing
If you have never seen it before, my inspiration is Nic Case who holds the world record for RC cars at 202mph.
His setup was very custom to say the least.
https://www.bigsquidrc.com/200-mph-rc-car-speed-barrier-broken/

Here is the details about my build. I wanted a small aerodynamic footprint much like Nic's car (1/10 scale on-road). I prefer shaft drive over belt drive (Nic used belt). I have built and run many cars over the years but wanted to do a build that is custom. This build will have a stretched chassis (around 2 ft long) as I need room for several batteries, a long motor, and big esc. The ideal platform for going fast on-road is 1/10 scale most are challenged with weak differentials, small bearings and overall weak parts. This is why most people end up running 1/8 scale cars for speed. I have done 1/8 and want to explore 1/10 further due to its aerodynamics benefits. I ended up choosing the redheaded step child vehicle that gets hated on due to low price and brand name stigmas. The RedCat Lightning STK happens to have a nice quality metal diff that is used on some of their other off-road models. They also have a large product offering of aluminum parts like a diff case which is very useful under heavy torque loads. Wayne Peeples (look him up on YouTube) currently has one that has hit 150mph (maybe more since I last checked).

Factory chassis with aluminum upgrades:
118873



Aluminum parts:
118874


I have since stripped them of their anodization and starting on polishing to a chrome look.

118875


Adding power to an RC car is pretty easy. Making the car stay straight down the road is likely the hardest part. Aerodynamics are the largest factor limiting an car from going faster. Without getting very technical on the math involved you want the car to be slippery and the smallest it can be to reduce drag force on the car. At the same time you have to manage down-force on the front and rear with some level of balance.
Taking an out of the box RTR car over 70mph is quite the experience. Buggies can get up around 100mph pretty easy with big motors and proper tires (foams or GRP rubber belted tires). Typically from there people turn to Delta Plastics for a speed run (thick) aerodynamic car body. Getting in the 110-125 range is quite the achievement. Only a select few have been in the 130-170 range with modified RTR cars. There are such a small number of persons over 170mph than you can count them on one hand, and only 1 over 200mph. This is no small challenge, many try and fail miserably! Crashes at these speeds often cost hundreds of dollars. Finding a smooth flat road with little to no obstructions along with no traffic is much like finding an unicorn. I will hope to run my car on a airport runway or similar location that is "perfect". It is a sad build in that tons of work will go into it with little actual drive time. Good thing I enjoy the build almost more than driving and I have other RCs for general use and bashing.

Now for the fun part. I will not show all my design yet, but the side profile looks pretty darn good!
118876


With that comes an CFD analysis (orange and white is higher speed airflow):

118877


Lots of work to do ahead of me, I am a busy guy with 2 young kids and wife.... so this will be a slow moving project.
It currently needs nearly everything worked on and details figured out.

118878




-Liberty
 
Last edited:

LibertyMKiii

RC Newbie
Messages
12
Location
Dallas TX
RC Driving Style
Bashing
Looking forward to this! Are you cutting the CF parts with cnc or by hand?
I might have access to CNC, but was planning on doing most of the work by hand. I have a pretty decent assortment of tools along with lots of PPE to work with hazardous particles like cutting finished CF.

-Liberty
 

Z.hb71

RCNT Basher
Messages
60
Location
Chicago, Illinois
RC Driving Style
Bashing
If you have never seen it before, my inspiration is Nic Case who holds the world record for RC cars at 202mph.
His setup was very custom to say the least.
https://www.bigsquidrc.com/200-mph-rc-car-speed-barrier-broken/

Here is the details about my build. I wanted a small aerodynamic footprint much like Nic's car (1/10 scale on-road). I prefer shaft drive over belt drive (Nic used belt). I have built and run many cars over the years but wanted to do a build that is custom. This build will have a stretched chassis (around 2 ft long) as I need room for several batteries, a long motor, and big esc. The ideal platform for going fast on-road is 1/10 scale most are challenged with weak differentials, small bearings and overall weak parts. This is why most people end up running 1/8 scale cars for speed. I have done 1/8 and want to explore 1/10 further due to its aerodynamics benefits. I ended up choosing the redheaded step child vehicle that gets hated on due to low price and brand name stigmas. The RedCat Lightning STK happens to have a nice quality metal diff that is used on some of their other off-road models. They also have a large product offering of aluminum parts like a diff case which is very useful under heavy torque loads. Wayne Peeples (look him up on YouTube) currently has one that has hit 150mph (maybe more since I last checked).

Factory chassis with aluminum upgrades:
View attachment 118873


Aluminum parts:
View attachment 118874

I have since stripped them of their anodization and starting on polishing to a chrome look.

View attachment 118875

Adding power to an RC car is pretty easy. Making the car stay straight down the road is likely the hardest part. Aerodynamics are the largest factor limiting an car from going faster. Without getting very technical on the math involved you want the car to be slippery and the smallest it can be to reduce drag force on the car. At the same time you have to manage down-force on the front and rear with some level of balance.
Taking an out of the box RTR car over 70mph is quite the experience. Buggies can get up around 100mph pretty easy with big motors and proper tires (foams or GRP rubber belted tires). Typically from there people turn to Delta Plastics for a speed run (thick) aerodynamic car body. Getting in the 110-125 range is quite the achievement. Only a select few have been in the 130-170 range with modified RTR cars. There are such a small number of persons over 170mph than you can count them on one hand, and only 1 over 200mph. This is no small challenge, many try and fail miserably! Crashes at these speeds often cost hundreds of dollars. Finding a smooth flat road with little to no obstructions along with no traffic is much like finding an unicorn. I will hope to run my car on a airport runway or similar location that is "perfect". It is a sad build in that tons of work will go into it with little actual drive time. Good thing I enjoy the build almost more than driving and I have other RCs for general use and bashing.

Now for the fun part. I will not show all my design yet, but the side profile looks pretty darn good!
View attachment 118876

With that comes an CFD analysis (orange and white is higher speed airflow):

View attachment 118877

Lots of work to do ahead of me, I am a busy guy with 2 young kids and wife.... so this will be a slow moving project.
It currently needs nearly everything worked on and details figured out.

View attachment 118878



-Liberty
Wow I'm looking forward to this!!!! Goodluck! I'm rooting for u to beat Nic's 202mph record!
 

LibertyMKiii

RC Newbie
Messages
12
Location
Dallas TX
RC Driving Style
Bashing
Wow I'm looking forward to this!!!! Goodluck! I'm rooting for u to beat Nic's 202mph record!
Thanks! That would be pretty amazing if I can. He set the bar high!
Maybe if I can pick up some sponsors that might help some. Nic had quite a few resources, but the hobby was different at that time.

-Liberty
 
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