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Old 02-07-2018, 07:43 PM   #1 (permalink)
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Giant homebuilt R/C Buggy

I have been working on a stupid-scale R/C dune buggy.
-70cc, 3 speed auto, Honda clone
-3/4 ERW frame.


Here is a little slideshow of the project in progress.


I can't post links, but this should paste into your browser;

Cheers!

youtu.be/MiKhhqmCz0s
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Old 02-08-2018, 03:24 PM   #2 (permalink)
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that's pretty impressive.
what CV joints are those, baja parts?

What size is your steering servo? I know that the scale is going to make most things look small and I see that you're running it off 12v, but it's gonna take massive torque to run your linkage as is.
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Old 02-09-2018, 10:34 AM   #3 (permalink)
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Thanks.

The CV's are 1/2" drive impact universal joints.

The 12V battery only supplies power to the servo's which are window motors. If they are not enough I'll use wiper motors. I'll also be using a motorcycle battery.

The engine is a 90cc, 3 speed auto, Honda clone.

I'm sure there will be issues along the way but that's half the fun.

Cheers,

KB
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Old 02-09-2018, 04:25 PM   #4 (permalink)
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how are you going to manage centering with a basic DC motor?
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Old 02-09-2018, 06:27 PM   #5 (permalink)
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The component with the wires coming out of it is an H-Bridge. It converts the low voltage servo signal into 12v for DC motor. The servo attached by the linkage has been gutted and is only used for its potentiometer to provide position feed back.

I have no electronic skills which I was so happy to find this plug and play product.

https://www.youtube.com/watch?v=x6yNfTb9LEo

Last edited by kustomkb; 02-09-2018 at 06:30 PM.
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Old 02-10-2018, 11:54 AM   #6 (permalink)
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I see. I didn' realize that the servo was there for position feedback and not actually moving the arm.

that's a clever solution.
I assume you're going to put an ignition cutoff failsafe device in it.
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Old 02-10-2018, 02:41 PM   #7 (permalink)
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I'll have a Superbee type failsafe as well as a stand alone manual remote kill switch.

Cheers.

KB
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Old 02-11-2018, 11:37 AM   #8 (permalink)
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Old 02-12-2018, 10:48 AM   #9 (permalink)
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This is going to be bonkers! Love it
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Old 02-12-2018, 11:19 AM   #10 (permalink)
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I love stupid and I love RC. This should be good. What's planned first run?
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Old 02-13-2018, 03:22 PM   #11 (permalink)
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Thanks for the encouragement.

With two young boys and a bunch of reno's to do shop time is at a premium.
If I could get it to the point of a test run in the summer, I would be happy.

The rear end coming together;


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Old 02-22-2018, 11:00 PM   #12 (permalink)
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Got a little action going on with the front end;











.
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Old 02-23-2018, 09:10 AM   #13 (permalink)
today
 
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holly shit
this is bad ass
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Old 02-23-2018, 11:04 AM   #14 (permalink)
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holly shit
this is bad ass
What he said!!
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Old 03-02-2018, 08:54 AM   #15 (permalink)
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Really Nice work!

Do you think the steering servo setup will be fast enough? I know my old 1/8th scale gas buggy suffered from that and it made it hard to drive.

Now scale it up for one your kids can drive!
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Old 03-04-2018, 10:25 AM   #16 (permalink)
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from the video he showed I don't think it will be an issue.

transit time looks on par for a 1/4 scale servo.
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Old 03-19-2018, 09:39 PM   #17 (permalink)
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Thanks boys!

I think the servo is quick enough, if not I can adjust it with the linkage. Hopefully the torque is enough.

Spring is here and the jobs are piling up but we got a little time in.

https://youtu.be/uwDtRRQ5U9s





Last edited by kustomkb; 03-19-2018 at 09:41 PM.
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Old 03-20-2018, 12:44 AM   #18 (permalink)
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really like what i see so far! keep it going
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Old 03-29-2018, 06:09 PM   #19 (permalink)
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Thanks CS.

Had some time to make a little chain tensioner;

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Old 03-29-2018, 06:27 PM   #20 (permalink)
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that's a real nice piece for something so simple.

what did you use for the guide plastic, a pre existing piece or something you cut down?
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Old 03-29-2018, 08:19 PM   #21 (permalink)
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What a waste of time

Imagine all those hours that could've been spent on facebook instead























Love it. Respect for your craft
Looking forward to seeing it wheel
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Old 03-29-2018, 08:41 PM   #22 (permalink)
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Thanks 87.

It is a piece of "Tyvar" highly wear resistant. I machined it with a bit of an arch. You can see where it machined nicely but where I hit it with the disc sander, it just made a mess.

Cheers 3n. Sometimes someone will look at something I have made and say;

"You have too much time on your hands."

"No, I just don't watch TV."

"Oh."

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Old 04-19-2018, 05:16 PM   #23 (permalink)
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WOW. You sir have a nifty project. I like giant scale r/c stuff.
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Old 05-01-2018, 09:02 PM   #24 (permalink)
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Thanks Flexy.

Not much time these days but starting to look at the drive train.
I rebuilt the top end with a fresh piston and rings and it fired right up!









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Old 05-02-2018, 09:16 PM   #25 (permalink)
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so if it runs............ will we get to see some test run vids? ......... this things going to be epic!
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