Author Topic: Scratch built giant rc car  (Read 11375 times)

Offline KB

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Scratch built giant rc car
« on: September 11, 2013, 03:51:07 AM »

I haven't built any model engines lately, but I have done a bit of model engineering.

Rear differential and drive-train;













Servo saver and steering linkage;







Shocks,



















Various parts;















Coping a tube in the lathe;









Hopefully, one day, it will all come together to look something like this;










Have fun out there!

-Kevin



Offline metalmad

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Re: Scratch built giant rc car
« Reply #1 on: September 11, 2013, 04:18:49 AM »
Wow, How nice is that
Love it  :praise2: :praise2:
Pete
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Offline swilliams

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Re: Scratch built giant rc car
« Reply #2 on: September 11, 2013, 06:38:09 AM »
Innovative and cool  :ThumbsUp: :ThumbsUp: :ThumbsUp:

Steve

Offline steamer

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Re: Scratch built giant rc car
« Reply #3 on: September 11, 2013, 11:04:54 AM »
Wow Kevin!    What is powering that beast?......looks like a quad bike engine and transmission! :o

Dave
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Offline MuellerNick

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Re: Scratch built giant rc car
« Reply #4 on: September 11, 2013, 11:48:23 AM »
Quote
What is powering that beast?


Looks like a Honda Monkey (or SS 50) knock-off engine (available with more than just 50 ccm). Cheaply available from China.


Parts look very professional made!




Nick

Offline b.lindsey

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Re: Scratch built giant rc car
« Reply #5 on: September 11, 2013, 12:15:01 PM »
That is really some amazing work there Kevin. Beautifully machined parts too!!

Bill

Offline V 45

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Re: Scratch built giant rc car
« Reply #6 on: September 11, 2013, 12:41:34 PM »
Again Kevein....GREAT WORK !! That will be pretty cool for your son to crash  :naughty: !! But by the looks of the construction he'll have a hard time doing it !!
  Dave
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Offline KB

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Re: Scratch built giant rc car
« Reply #7 on: September 11, 2013, 05:00:34 PM »

Thanks a lot everyone.

Yes it is a Honda clone. I believe Honda started producing these engines when they came out with the Cub or Passport. The most produced motorcycle scooter in history.
The one I have is a 70cc, 3speed auto. It came from a Chinese quad I was given. It needs a complete rebuild. (think disposable engines) I think up to 110cc uses the same crank-case.

I put a real Honda, 70cc, 3 speed, manual in this contraption;






Quote
That will be pretty cool for your son to crash  :naughty: !! But by the looks of the construction he'll have a hard time doing it !!

I'm not too worried about the car, but whatever gets hit! I'm going to try and set-up a triple redundant fail-safe/ kill switch system. 2 electronic and one mechanical.
I should probably take out an insurance policy too. It will be about 4 feet long and weigh well over a hundred pounds.

Cheers!


Online Tennessee Whiskey

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Re: Scratch built giant rc car
« Reply #8 on: September 11, 2013, 06:57:41 PM »
Looks great Kevin. I love the "huge" RC stuff. Aircraft with 8' wing span and this kind of stuff.  Dave, this thread may need to be off limits to William. I'm waiting on a Wallaby 8)

Whiskey

Offline smfr

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Re: Scratch built giant rc car
« Reply #9 on: September 11, 2013, 07:41:06 PM »
Wow, awesome stuff!

The front end looks a bit fragile. Any reason there aren't struts across the very front of the frame? Or did you just slice off the front for the rendering?

Simon

Offline jwcnc1911

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Re: Scratch built giant rc car
« Reply #10 on: September 11, 2013, 09:42:50 PM »
This is freakin awesome!
----------
JW

Offline KB

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Re: Scratch built giant rc car
« Reply #11 on: September 12, 2013, 04:59:01 PM »

Thanks all,

Simon, You are right, there will be cross bracing up front and a bumper of some sort. I just didn't work it all out ahead of time. I want to make sure I am happy with the steering linkage before I fill it in.
Also I may need room for a battery and electronics, maybe the fuel tank as well...

I made full size templates for bending.

First set my very expensive angle o' meter;




Then set the starting point of the bend. A sample bend is marked to a corresponding mark on the benders' die. It is placed so that the bend touches the outside of the bend and the mark is transferred to the template;




Then the mark is transferred to the stock;




Then into the bender and bent to the previously set angle;




Then it is notched and back to the template to be marked for final trimming;





I don't have a proper bender, but your standard import bender for which I have made quite a few dies.


For pieces too large to fit the lathe I have this tube notcher, which I made a long time ago;






Cheers,

KB

Offline KB

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Re: Scratch built giant rc car
« Reply #12 on: February 27, 2018, 04:08:47 PM »
Well this project was shelved while I raised my two sons, racing BMX with them and doing a lot of home renovations.

It is time to get back out in the shop!









.

Online Vixen

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Re: Scratch built giant rc car
« Reply #13 on: February 27, 2018, 04:30:48 PM »
Hi KevinB

That's an amazing vehicle. A full size racer, but in miniature.

I watched the video and have a question about that steering servo. It looks like you are using a window winder motor with a slave servo to give position feedback. Am I correct? The next question is about what are you using for the electronics module. Who is the manufacturer ans supplier?

Mike
It is the journey that matters, not the destination

Offline Allen Smithee

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Re: Scratch built giant rc car
« Reply #14 on: February 27, 2018, 04:39:40 PM »
If you're going to run it off-road won't you need a lock for that diff?

AS
Quidquid latine dictum sit altum sonatur