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Thread: Making a more fragile body than Lexan?

  1. #1

    Default Making a more fragile body than Lexan?

    That probably sounds stupid, but what I'm hoping to be able to accomplish is to easily and cheaply form a body that's more fragile than lexan. I'm interested in making some videos that sort of duplicate the awesome car chase scenes that I grew up with in the 80s, and to make them look as realistic as possible, I want to be able to use some car bodies that will crush a bit on impact.

    My plan is to have a "hero" body for the detailed shots and a "stunt" body for the jumps & crashes. To create the stunt body, my plan is to start with a fresh lexan body, and use it as a mold. On the inside of the body I want to try applying a thin coat of silicone mold material, then back that with a couple thin layers of paper mache. My thought here is that the body should be just strong enough to hold its shape, but should collapse nicely on impact. The rubberized outer shell should prevent it from cracking, and should help it look more like real sheet metal damage.

    Does anybody have any other ideas for how I could easily and cheaply make these body shells? Because I'm going to wind up trashing a fairly large quantity of these, it's got to be something that I can make quickly, easily, and cheaply.

    Thanks!

  2. #2
    Join Date
    Dec 2017
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    Noob did an awesome orange yota years ago with aluminium doors that deformed, just like the real thing, on impact- I think it's in the Guild's finest, worth a look!

  3. #3
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    Metal Masher also builds out of this material. His builds are some of the best.
    SBG OWNER YOUTUBE AXIAL AMBASSADOR GCM TEAM DRIVER VANQUISH KNIGHT CUSTOMS TEAM

  4. #4
    Join Date
    Aug 2019
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    If i remember right Bondo works well to make the Male molds from the Lexan body. Then some Aluminum tooling foil/aluminum disposable baking pan, excessive patience, shoegoo.

    http://www.youtube.com/watch?v=YbjIcrmm7Pw

    http://www.youtube.com/watch?v=hKBlotVQilE

    http://www.youtube.com/watch?v=kdFi5_reWSI

    http://www.youtube.com/watch?v=ojRQCfgRMeA

    Build thread http://www.rccrawler.com/forum/showt...35#post1916635

    What type of car & chase scene are you thinking?

  5. #5

    Default

    Thanks to everybody for the suggestions. I've got to figure out just how much time I want to spend on making these disposable bodies and then figure out if some of these aluminum options will be best, or sticking with a faster option will be the way to go. I'd dismissed using aluminum because I felt like it would be way too time consuming, but the more I think about it, if I can form a body in 3 pieces (middle - the hood, roof & decklid, then the two sides), it may not be too time consuming, and might give me the most realistic results.

    Quote Originally Posted by Frizzen View Post

    What type of car & chase scene are you thinking?
    I've got a bunch of ideas swirling. I'm an 80s kid, so I grew up watching the Dukes of Hazzard and the Fall Guy, so those are ever-present in my head. In fact, I'm building a Fall Guy truck on a Barrage platform currently. The one thing that I see with so many of these otherwise impressive RC chase scenes, is that the landings, and especially the crashes, just don't have that realistic look, and that's what I'm hoping to be able to accomplish with these "stunt" bodies, along with a chassis that's got some crush zones. Because the bodies will end up getting pretty much ruined every time I jump one, I'm hoping to find a solution that allows me to make the bodies fairly quickly & definitely cheaply. I was unaware of the tooling foil like those videos linked above showed. Those look like they would be fairly difficult to form a 1 piece body with, but I think it could be very do-able with a multi-piece configuration. Initially I was thinking that a 3 piece configuration would be best, but having separate front & rear fascias may be a decent idea too, especially considering that I may want to just replace parts of the body instead of the whole thing every time.

    I think my next step should be to make some bondo molds from the inside of one of my lexan bodies and see how viable this is.

  6. #6
    Join Date
    Aug 2019
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    You can make the aluminum ones off just a plastic hard body, but they won't come out all that pretty. You can't get enough force through the plastic to shrink/stretch the metal quite right before the plastic deforms away and the metal over stretches. Works for practice to see if you want to try it their way.

    I still suck at making these bodies, but 5 piece might form easier than 3. you'd probably want to go atleast: right side, left side, roof, hood/grill, trunk/tail lights.

    I forget who or even which forum i'd seen it on, but there was a guy who built a Spec of maybe a half dozen rc trucks for a Demolition Derby that were made as a really flimsy metal chassis to hold hobby grade (buggy/stadium truck?) front and rear ends, even stronger bumpers, with aluminum bodies. Those trucks folded up like the yellow Mustang from original "Gone in Sixty Seconds", but could be mostly straightened out for next event.

  7. #7
    Join Date
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    Quote Originally Posted by Frizzen View Post
    You can make the aluminum ones off just a plastic hard body, but they won't come out all that pretty. You can't get enough force through the plastic to shrink/stretch the metal quite right before the plastic deforms away and the metal over stretches. Works for practice to see if you want to try it their way.

    I still suck at making these bodies, but 5 piece might form easier than 3. you'd probably want to go atleast: right side, left side, roof, hood/grill, trunk/tail lights.

    I forget who or even which forum i'd seen it on, but there was a guy who built a Spec of maybe a half dozen rc trucks for a Demolition Derby that were made as a really flimsy metal chassis to hold hobby grade (buggy/stadium truck?) front and rear ends, even stronger bumpers, with aluminum bodies. Those trucks folded up like the yellow Mustang from original "Gone in Sixty Seconds", but could be mostly straightened out for next event.
    Frizzen is correct, you can form the bodies right off a hard body with fairly good success. I've done it myself. And he is also correct that the more individual panels you are willing to form, the easier they are to make and the more realistic they will look.

    And those demo cars you are referring to are mine as well.

  8. #8
    Join Date
    Aug 2019
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    51

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    My bad, i'm better at remembering awesome stuff than the awesome guy who made it. Been a fan of those bodies for years.

    Realistic unibody damage car
    http://www.rccrawler.com/forum/non-c...usher-car.html

    Spec trucks
    http://www.rccrawler.com/forum/non-c...demo-cars.html

    https://youtu.be/1KZPAVxz4Pg
    Was the wagoneer you put up against the 'production' derby cars made of the tooling foil, or was it the thick stuff like they use?
    https://www.shop.jmwmotorsports.net/...O-DERBY_c5.htm

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