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I work for Toys for Bob / Activision. Posts here are my personal views, and do not necessarily reflect that of my employer. 

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Sunday, December 27, 2009

Micro Crawler with a model kit body

Here is something that I've been tinkering with lately, a 1929 custom pickup model body on the Losi micro crawler. The model was hacked to fit as low as possible on the chassis, cutting out holes in the body to make room for the shocks.

The model and test fit:



Primer coat:



Final truck











I moved the rx into the cab of the truck, and relocated the battery inside of the hood. The body is just servo taped to the chassis. I also replaced the stock springs with micro-t springs to bring the CG down. This helped a lot in how it performed, stock CG is really high and makes it quite tipsy. Also the foam inside of the tires were removed, and I wrapped solder wire inside of the rim for some weight. Front wheels are now around 17g, and 15g or so in the back (Stock is ~11g). When I tried more weight (~20g), I found that it had a harder time with the steep walls of the losi track. Here is a quick video of it in action:



This is a really fun rc crawler, being micro sized makes it really fun to try to climb everything on the desks and floors. I got the losi tracks from a LHS for free, and is really fun to test and play in. I'd strongly recommend it for anyone with a micro crawler.

I've got bunch of ideas that I'd like to find the time to tackle using this chassis. I don't think that I will go as far as a scale rig, that just seems way too much work.... But it is a really nice chassis platform.

I should point out here that there seems to be some QA issues with the center tranny gear. At least with this first early batch. I had one, like many other people around the forums, that suffered from some binding. The binding were not very noticeable in my case. However when I took the transmition out, there was an area in the main center big gear that would catch a bit. Being too impatient to wait for a Losi fix, I did what some others have done, sanded out the hole a bit around the bearings of the gear box. This allowed the shaft to be more forgiving, but it still catches a bit some times. I ended up sanding the hole bigger and bigger, before noticing the real issue. So I had a big hole in which the center shaft had a lot of play. The final fix was to add a single bead of shapelock to hold the bearing in the correct position. It's a hack, and I'm not sure if I'd recommend others to do this, but mine is now silky smooth. Hope that losi will recognize the issue an have it fixed soon.

- Posted using BlogPress from my iPhone

8 comments:

  1. Might I suggest you put the Follow button on your blog site? It makes following easier, placing your blog into my Google reader.

    I have enjoyed visiting your web site over the past couple of years. Thanks for sharing your work.

    Mike

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  2. That is great, consider cutting the foams into a star and putting them back in, they make a big difference in performance.

    You retain the squishy sidewall for traction, and the extra weight no longer makes your rolling diameter too small to conquer obstacles.

    http://clodzone.com/?p=386

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  3. Oops, I see that your tire aspect ratio is very low and your tires are quite stiff (ridiculously in fact).

    Much squishier tires are needed (and possibly smaller rims). Would much improve the looks and performance.

    Body looks incredible, beyond words :)

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  4. interesting read. I would love to follow you on twitter.

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  7. If ol Henry had put a tire and suspension set-up like that on his vehicles,those early roads would have been much easier to take.
    The body looks really good on the micro chassis.
    I cut two coils off of each shock spring on my micro and it really helped out with the top-heaviness of the truck.

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  8. This is a really awesome model, I can't believe how much of a wall it can actually climb.

    ReplyDelete