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Monsters of R/C If its massive, ain't scale, and can break an ankle when it hits you, put it here!


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  #61  
Old 01-07-2013, 02:16 PM
nathanvr nathanvr is offline
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congratulations!!
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  #62  
Old 05-06-2013, 02:51 PM
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I haven't read the whole thread, but ain't that a COCONUT?? (I mean in Post #57!) Did I win?

Just funnin' you Mate, no offense intended: Stellar thread, truly. Chris REC
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  #63  
Old 05-13-2013, 03:39 AM
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Video?
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  #64  
Old 12-12-2013, 09:31 AM
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There will be video hopefully. I have had a bit more free time lately. It
s not much, but at least it is semi-regular- which is also something we can all wish for our digestive systems.

I have a lexan body with a bunch of random styrene sheets staring at me, daring me to work on them. But for now, I will subject everyone to some random bits of useful information:

How to say 'coconut' in American sign language:
http://www.handspeak.com/word/?dict=co&signID=3543

How to say 'potato' in American sign language:
http://www.handspeak.com/word/index....po&signID=1689
Incidentally, the 'potato' also means 'Ireland' or 'Idaho' in ASL as well.

Oh Chris- 'coconut' has become my nickname in the house. GEE I WONDER WHY

Peace be with you, my brothers and sisters.
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  #65  
Old 02-04-2017, 09:36 PM
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Greetings from exile, my brothers and sisters.
The time for stealth and hiding soon draws to a close. The little one has grown older, walking, talking, and capable of defending herself from the coconut menace with melee weapons or by her own little fists.

It is time to make progress on this project.

I have finally made body mountings which are lightweight and make sense. I had to sacrifice a Mini-ITX Turbo Electronic Abacus power supply bracket but it was worth it.





I also decided to spend a few brapples and upgrade to a high frequency toothbrushless electron regulator. It's capable of almost 500 x 10 ^18th elementary charge regulations per second. Here it is wired for parallel operations.



Dual 9T sensorless motors are in play, and they seem to work reasonably well running in parallel mode. There is a bit of cogging but that pretty much resolves itself by 1/3 throttle or if the truck has enough momentum.

The front steering uses a neat little trick servo saver that I made from extra T-Maxx big bore shock bodies. The image here should explain what is going on...



And then I decided to mount a body. I used the default Clod styrene body as a reference point, but liked it so much that I now have the Lexan version
on order. I still had not settled on a final design for paint and stickers, but if all goes well it will be suitable retro styled and somewhat offensive in content.





Peace be with you, my brothers and sisters.
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  #66  
Old 02-05-2017, 04:36 AM
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Been along for the ride the whole time on this build...
So glad to see you and it back on the board.
Huge grins and giggles here still....ahahaha.
Beasty and tough as nails.
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  #67  
Old 02-06-2017, 08:35 AM
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Quote:
Originally Posted by 2Beers View Post
Been along for the ride the whole time on this build...
So glad to see you and it back on the board.
Huge grins and giggles here still....ahahaha.
Beasty and tough as nails.
Thanks It's good to be back. I have a pair of Lexan bodies and some paint on the way... hopefully it will come out well. The only side effect from the parallel brushless motors was some glitching which caused radio interference. I was running a legacy 75 megapickle set, but when I switched to a 2.4 gigapickle system the troubles went away. I'm still perplexed why that happened because nothing obvious showed up when I scoped everything on a test bench. WEIRD.
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  #68  
Old 02-06-2017, 08:48 AM
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Still stupid. Still love it.
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  #69  
Old 02-08-2017, 12:49 PM
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Thanks Danielk!
This project is fun. I am making a few different bodies for this truck - one of them will be a lexan 'safe for public' consumption body, and another will be a straight up Clod homage. I feel like a bit of a butt for having parted out all of my existing Clod hard bodies many moons ago, so ordering a new one just did not sit well with me...

Until I started to design these homage decals for them.



What do you think so far? I am still working on these of course. Trying to retain the 80's style corny, guilty pleasure-style, yet surprisingly upbeat graphics for the Nut Buster body. Feedback is greatly appreciated. Criticism appreciated even more!

Thanks for reading!
Peace be with you, my brothers and sisters.
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  #70  
Old 02-09-2017, 12:38 PM
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Love the decals.

Maybe too far, but have you considered "Supergroper" to replace Supergripper?

Just a thought.
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  #71  
Old 02-10-2017, 02:29 PM
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Thanks! I could not think of anything really great to replace Super Gripper, so I ended up leaving it out entirely. I like Super Groper though... I'll keep that in mind for another truck...
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  #72  
Old 02-13-2017, 10:33 PM
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Well, I'm a bonehead. All I had to do was draw a circuit diagram of what happens when you add a second brushless motor in parallel and the simple answer is this- You are going to get back EMF in the circuit, messing up both motors. This has nothing to do with the speed control. As for why I got lucky with the Jeti the first time around- I simply didn't drive the truck enough- and of course I was indoors. All it needed was one minute outdoors on uneven terrain to debunk that whole thing. That explains that!

So long story short, I am now running the truck properly.
- I put two of my Jeti ESCs into use, joining positive to positive, and negative to negative on the battery leads to a Deans connector. I'm using these because I had them lying around. They came from my 6WD Clod, Tiamat.
- removed the red (positive) pin from one of the ESCs so I would not have dual BEC circuits fighting each other.
- Harnessed both ESCs together to a Y-cable and plugged everything in.
- MOST IMPORTANTLY I tested the truck OUTSIDE for a period of more than 60 seconds this time. Hah.

So in conclusion:
- I don't think that there is a back EMF sensor in newer ESCs. If there is, they would be advertised the hell out of.
- The smooth low end response on the GoolRC ESC I had was probably explained by a very gentle throttle curve, as opposed to the Jeti which was more linear and unforgiving on the low end.
- I'm an idiot and should have mathed a bit more before jumping to conclusions
- Two BLDC ESCs isn't such a bad thing. It's cumbersome, but not terrible.

Well at least on the bright side, I have put my idiot powers to use for all of you, so you won't have to encounter this sort of idiocy personally!



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  #73  
Old 02-13-2017, 11:27 PM
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Dominick Shauntee Dominick Shauntee is offline
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I am SOOOOOOOO glad you started this one back up !! it's and least on the second scale of epicness !!
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  #74  
Old 02-15-2017, 08:45 AM
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Thanks Dominick
I have tried printing out stickers to acetate transparencies just for the hell of it... and they are just 'okay'. White background regions have to be cut out manually, probably using airplane covering. I'll have to use this method on lexan bodies. I have some water slide decal paper on the way and that's going to be what I'll use for the hard styrene bodies. LAV25 pointed me the right way to doing that.
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  #75  
Old 02-16-2017, 07:21 AM
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Quote:
Originally Posted by potatocat View Post
LAV25 pointed me the right way to doing that.
I did? Cool, I did something useful....
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