Buggy body on TT02

[Skimax 30]

Has anyone done this?? I am thinking that this would be a fantastic option for a speed run car as the body would fit tighter against the chassis and potentially eliminate a lot of the air flowing into the body… I have an associated buggy and the body for that basically velcros along the edge of the chassis and creates a seal more or less. Would a Tamiya buggy body be able to be mounted in a similar way? I’m thinking of a neo scorcher body potentially.

[Busdriver 6281]

Isn’t that a TT02b neo scorcher then. But yes I’m assuming you mean using a saloon car chassis therefore narrower track. Worth a try?

[Kowalski86 4076]

Most "race-spec" touring cars have blobby bodies that cover up the wheels entirely. I'd go with something like that.

If you plan on speed running on the street, I think a slammed TT-02B might be in order for better stability.

[Willy iine 18826]

Yeah, my TT02B is the metallic pink version NeoScorcher... It should fit a  TT02..

[Skimax 30]

1 hour ago, Willy iine said:

Yeah, my TT02B is the metallic pink version NeoScorcher... It should fit a  TT02..

Is the neo scorcher the same tub as the regular TT02? I can’t seem to find any pics of the bottom of the Neo scorcher.. can you snap one to see how the body aligns with the tub?

[Willy iine 18826]

Sorry I don't have any attachment memory left on this site.. a frequent problem I encounter.

Have you checked the Tamiya site for more info?

[TurnipJF 9871]

1 hour ago, Skimax said:

Is the neo scorcher the same tub as the regular TT02? I can’t seem to find any pics of the bottom of the Neo scorcher.. can you snap one to see how the body aligns with the tub?

Here you go:

Same tub as the TT-02 road-going versions. 

[Skimax 30]

39 minutes ago, TurnipJF said:

Here you go:

Same tub as the TT-02 road-going versions. 

You rock, thanks!!

unfortunately that doesn’t look as tight as I was hoping… would probably need to build up some material along the edges of the tub to get it more in line with the body.

[qatmix 822]

I honestly think running an aero shell will be better for a speed run. 
 

I don’t think air going under the body is an issue as long as it is able to escape at the rear. 
 

Interested to see how you get on. 

[Skimax 30]

33 minutes ago, qatmix said:

I honestly think running an aero shell will be better for a speed run. 
 

I don’t think air going under the body is an issue as long as it is able to escape at the rear. 
 

Interested to see how you get on. 

I’m thinking about it kind of in reference to f1 or open wheel cars. They have a pretty good time handling high speeds and it’s my theory that the smaller the enclosed mass, the less chance that air will get in and turn the thing into a sail. One of the weaknesses in this regard for these RC cars is the wheels since there are no wheel wells or anything and it’s hard to seal that part up. If you put the wheels outside the mass then you might have a better time dealing with that airflow :dunno:

I could be completely wrong about this but it makes sense in my head lol

[Skimax 30]

For reference, here’s a pic of the bottom of my associated buggy. The body fits the contours of the chassis pretty closely and I think makes a better seal.

 

[Mad Ax 10130]

I'd actually be very interested in a speed / drag comparison between a tight-fitting buggy body and an aero race body in a top speed test.

F1 designers have a real hard time dealing with the turbulence caused by the wheels being out in the open, and lots of the weird and wonderful curly parts on the front wing flaps and floor edges are designed to deal with that turbulence.  It's sure to have an impact in the 1:10 world, although at that scale and speed, I don't know how much it will affect it.  I'd be really interested to find out.

AFAIK, full-size closed wheel cars have less drag and turbulence, but as mentioned above, full-size cars have arches to prevent too much air getting around the wheels.  Also they have flat sealed floors and diffusers.  I've often wondered how the air coming up into the body affects the drag, and if the open rear that some aero bodies have helps with this, or creates downforce, or just causes lots of turbulence.

We need to hire a wind tunnel to find out  

[alvinlwh 7052]

.

[Mad Ax 10130]

37 minutes ago, alvinlwh said:

You don't really need a wind tunnel, just a fan and a good strong vape can give you an idea.

Need a fast treadmill too so we can see the effect of the road surface and spinning tyres.  No point doing things by halves  

[alvinlwh 7052]

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[Mad Ax 10130]

4 minutes ago, alvinlwh said:

There you go.

Wow, that is awesome!  It must take some skill to do that!

TBH I was thinking to use a tether, and set the steering angle up so the car naturally wants to run straight.  I'm guessing a gyro could help there too.  IIRC, the car mockups in F1 wind tunnels are fixed to a solid tether so they don't sway.

I've given this way too much thought, since I don't have a treadmill, I don't vape, and I don't enter the top speed challenges.

[alvinlwh 7052]

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[Skimax 30]

I like where this is going!

[Skimax 30]

So, I came across this and am quite intrigued...

Basically it's a tight-fitting shell that is attached with velcro to the side rails of the chassis... almost exactly what I was looking for! I think it's meant to be a sort of "underwear" beneath an actual chassis but I would probably run this by itself.

https://www.tamiyausa.com/shop/misc/rc-tt-02-chassis-cover-set/

[Skimax 30]

Update: got the chassis cover and I think it will be awesome to just run as the body. Fits tightly against the chassis and very low profile!

 

[one_hit 1082]

Saw this online, dust cover made from a soda bottle. It actually doesn’t look bad 

[markbt73 5699]

That chassis cover is going to create a lot of turbulence, with all those bumps and ridges. What you want for speed is a smooth surface that creates negative lift so it holds the car down.

The trouble doesn't come from air getting in under the body; the trouble is when it can't get out again. Look at high-speed on-road race cars, and you'll see they all run vaguely Can-Am styled full bodies, but with the rear panel cut out. That gives a nice smooth path for the air over the car, and a gigantic escape route for any air trapped under the car. And the vertical flat sides of the body act as horizontal stabilizers to help it track straight.

 

 

When I raced pan cars on an oval, we did the same thing, only with stock car bodies. We'd cut out the rear bumper completely, sometimes all the way up to the trunk lid, then add a wing on the back for stability. You can try the same thing with a normal touring car body, if you're willing to cut one up.

My point is that lower isn't necessarily going to be better. The shape, and the path the air takes, matters a lot more. You can try running just the chassis cover, but don't be surprised if it's actually slower than it was with the full body, properly trimmed.