Discuss Ghostbusters: Afterlife, released on November 19, 2021 and directed by Jason Reitman.
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By TheRcProfessional
#4963077
Far451 wrote: August 1st, 2021, 10:02 pm As far as i can tell, this is the most likely candidate for the drive train of the RtV. The Traxxas Hoss 4x4 vxl
https://traxxas.com/products/landing/hoss-4x4-vxl/

The ground clearance is correct ( the tires are different) the wheelbase on the RtV is shorter( by about 3.5" to 8" from 11.5"), but the design of this RC car allows for an easy shortening of the front drive shaft. The front bumper is the right shape, and the suspension is the right type and also is in the right place.

Since the tires were identified as Traxxas and they are for a 1/10 scale car, this model is the closest thing I can figure.
Many other Traxxas vehicles have the wrong suspension (visible in the trailer if you go frame by frame), or wrong chassis layout. or wrong ground clearance(The Stampede is too high).
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I have found the guy who made/drove the RTV prop for the movie, his name is Ben Eadie. He has made a TikTok account where he is planning on detailing his rebuild of one of the many real RTV props made for the movie. As well as answering questions about the many props he has made for Ghostbusters Afterlife. He has already answered the question of what RC platform was the base for the RTV, it was the Traxxas Stampede 4X4 VXL, as shown in this video made by himself: https://www.tiktok.com/@dreadmakerrober ... 6453471749
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By danimal
#4963170
Yes, the stampeded VXL was used for the movie prop... but that doesn't mean the Hoss isn't the better choice to start with. The VXL is the most important bit, so using the hoss gets you closer to the finished mark quicker/easier just slightly.
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By Grymlock
#4963255
danimal wrote: December 10th, 2021, 10:20 am Yes, the stampeded VXL was used for the movie prop... but that doesn't mean the Hoss isn't the better choice to start with. The VXL is the most important bit, so using the hoss gets you closer to the finished mark quicker/easier just slightly.
The Hoss might get you closer faster, but is pretty pricey at $480; you can get a Stampede 4x4 kit for $280. The VXL portion just swaps in their brushless system for the brushed which gives you 3s lipo speeds... but unless you're aiming to hit 40+ miles per hour to keep up with Ecto-1, I think the brushed system is peppy enough on 2s. :-) Even my Rustler 4x4 VXL, which has a really low CG, will traction roll on a 3s batt.

I'd say the most important part if you're going Traxxas is to get a 4x4 version because they mount their motors midship, vs. their 2wd offerings, where the motor is slung off the back behind the rear wheels. For my build I tried to go the budget route and chose the Arrma Granite Mega Voltage since it was 2wd (no driveshaft to cut) and has a midship motor. 4wd though would be really nice in hindsight; the short wheelbase makes it spin out quite easily. :-)
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By chrisyc
#4963828
Hi. Are the side panels the standard trap size? Is it just the rear box that is bigger?

Thanks
Far451 wrote: August 12th, 2021, 11:12 pm I mounted the wheels on a Traxxas Stampede 4x4 with wheel hub extenders and enlargers ( from 12 to 17mm and 30mm extension)
I realize that this likely isn't the right host drivetrain, but the Hoss was double the price. I did see many similarities, and from what I can tell I will be able to make this work. I will be changing the camber links (these are grey plastic) to black metal links.
The rear shocks are too high, so I've ordered smaller ones and will switch those out, and center drive shaft needs to be a whole lot shorter, so I ordered a metal one that I can trim down.
I foresee a lot of work making this look right.

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I've also been mocking up the rear box on the trap portion. It's a lot longer than the other GB1 and 2 traps. I've added the rear box top on the top of the GB2 trap to see the difference. It's just a mock up for now. If anyone has other images of the RTV please feel free to post them here. I have very little to go on so far.

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By Far451
#4963833
The only normal size thing is the width.

The side panels I designed are very odd compared to a normal trap. They integrate a bottom plate into the side. Otherwise you would interfere with the drive train.

If you look closely at the RTV, you start to see that is is a very different trap from GB1 or GB2. The aluminum sides have to be cut out differently as well for the front wheel assembly and the shock supports.
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By chrisyc
#4963838
Thanks for the reply. It is quite a lot different :o - Are the trap doors the same size? They look small but it could be due to the trap being longer?
Far451 wrote: December 17th, 2021, 8:42 am The only normal size thing is the width.

The side panels I designed are very odd compared to a normal trap. They integrate a bottom plate into the side. Otherwise you would interfere with the drive train.

If you look closely at the RTV, you start to see that is is a very different trap from GB1 or GB2. The aluminum sides have to be cut out differently as well for the front wheel assembly and the shock supports.
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User avatar
By Far451
#4963971
Finally done! Well the RTV, the remote is still in process… a little too much fuller's earth on it, I'll clean it up when I run it outside tomorrow.
I ran it in the living room and popped some good wheelies, then crashed it into a chair and broke the flashlight. (facepalm) Training mode next time.

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By Grymlock
#4964489
Horizon Hobby has the Arrma Granite Voltage Mega 2wd on sale for $89.99 (usually $119.99) :-) It's the platform I used as my base if you're looking to build a more budget, but still very capable RTV.

This is mine tearing around with a 2s lipo ^_^
Last edited by Kingpin on December 30th, 2021, 4:49 pm, edited 1 time in total.Reason: Added YouTube code
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By GhostbusterRN
#4966081
My RTV tearing it up in the snow, I’ve been following this thread forever and have been making myself wait till it was essentially done to post, while it’s not movie accurate, I’m happy with how it came out, and it was more important to have functions (doors opening, lights and smoke then to look accurate as when taking it to shows kids won’t know the difference, but having it open and smoke should get their attention.


Last edited by Kingpin on January 25th, 2022, 4:55 pm, edited 1 time in total.Reason: Added YouTube code
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By Grymlock
#4966151
GhostbusterRN wrote: January 24th, 2022, 5:44 pm My RTV tearing it up in the snow, I’ve been following this thread forever and have been making myself wait till it was essentially done to post, while it’s not movie accurate, I’m happy with how it came out, and it was more important to have functions (doors opening, lights and smoke then to look accurate as when taking it to shows kids won’t know the difference, but having it open and smoke should get their attention.


Woo! Looks great!! =)
By Mathew_impact1
#4966863
Started to seriously work on my RTV this weekend.
Imagur link RTV traxxas stampede 4x4 conversion
[/url]https://imgur.com/gallery/2cm0kB6[/url]

ImageI removed 1/2" on each side, and 3" in length.

ImageCut pattern and marks for m4 screw holes.

ImageI used extruded aluminum 1" L channel to splice front to back. Trap side plates are layered 1/16" ABS sheet, edges will be built up to 1/4" thick. The stock tower extension arms are 3/16" polycarb.
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I purchased far451 3dprint files off etsy, which are beautiful, and will use them for the flashlights and antenna knob. But I plan to build the rest rest from scratch or original materials. As I'm not a fan of print lines.
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By Grymlock
#4966917
Hey future and fellow RTV builders! =) Traxxas cars/trucks don't go on sale too often, but they're having their Spring Savings event til Mar 31! Looks like $30 off a Stampede 4x4 (Non-VXL), and $60 off a 2WD VXL Stampede. I believe the 4x4 VXL version of the Stampede was used in the official screen build but the non-VXL brushed motor version has the same layout as the VXL one and is still plenty fast. The 2wd VXL brushless motor one can be stupid fast, but I'm not sure on how the layout might affect your build. ^_^

https://traxxas.com/news/spring-savings

Cheers!
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