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Car Action World's Fastest RC Car Challenge! What car are you going to build to break the world speed record for RC cars?

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  #301  
Old 06-16-2004, 05:38 PM
Mike Keeney Mike Keeney is offline
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Quote:
Originally Posted by RC-scientist
Read my post on the new size forum.

150mph ha, with this new size thing I think it will be more like 200mph.. Also I think the L3o was running on just one section of the track, so if you open it up to the turns I think the sky is the limit.

..{snip**...

If this lenght stays and the engine size is not limited.. The number will be around 220mph I am sure of it.

RC-Scientist
It's impossible to predict who, or what kind of car will win. I couldn't tell you to save my life whether my 40" blown nitro V8 is a sure bet to set the record. Engine power is only one factor to be considered. All the hp in the world won't do you any good if you can't get it to the ground. After that, there's a bunch of other factors that come into play. Any one of which can cost you the prize.

Like the old saying, it over till the fat lady sings.

Mike
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  #302  
Old 06-16-2004, 06:02 PM
lerningdriver lerningdriver is offline
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^^^ that's a saying??? lol

but no, I don't think we will get to see 200 mph... not any time soon atleast.
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  #303  
Old 06-16-2004, 06:18 PM
AudiTT-Quattro AudiTT-Quattro is offline
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KE = 0.5mv^2 where 'm' is the mass, 'v' is the velocity, and power being a function of work... And no, it's not a linear function (that would be sweet though!)

EDIT: Post is directed at guver.
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  #304  
Old 06-16-2004, 10:25 PM
Mike Keeney Mike Keeney is offline
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Quote:
Originally Posted by lerningdriver
^^^ that's a saying??? lol
Well, I did say it was old.

Mike
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  #305  
Old 06-16-2004, 11:09 PM
crank throw wei crank throw wei is offline
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Quote:
Originally Posted by RC-scientist
150mph ha, with this new size thing I think it will be more like 200mph..

Steve needs to think long and hard about this. This change really moves the contest into less RC more real world mechanics. Not that RC car dont have them but now you are talking about full size engines. Gasoline, or alchohol top fuel engines. The sky is really the limit.

If this lenght stays and the engine size is not limited.. The number will be around 220mph I am sure of it.

RC-Scientist
I agree.My 150 mph figure was targeted at the 24" rule.I'm sure Steve was just trying to accomodate the 1/5 scale guys,but this really relagates the 1/10-1/8 scale cars to also rans,IMO.I could potentially see using an 1100cc turbocharged motorcycle engine,which seems to me moves this competition out of the relm of what we normally consider RC.
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  #306  
Old 06-16-2004, 11:20 PM
racerrandy racerrandy is offline
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Where are you guys gonna put a motorcycle engine at on this 40" long beast. you can only get it so low, you'll have no room for suspension, and it will be about as aerodynamic as a bale of hay. Pull the trigger just a tiny bit too fast or hit one tiny bump, and you'll be pickin it up with a broom and dustpan.

Maybe they will make it like NHRA, and fine you for oiling down the track!

Later, Randy
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  #307  
Old 06-16-2004, 11:49 PM
Mike Keeney Mike Keeney is offline
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All the horsepower in the world won't do you a bit of good if you can't get it to the ground.

Mike
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  #308  
Old 06-17-2004, 06:37 AM
Hz-R Hz-R is offline
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Quote:
Originally Posted by guver
Can anyone confirm this?
It takes 10 times the power to double the speed, especially at higher than 100. Is it a constant slope?
It's not a constant slope.
F=q * Cw * A * V2/2

F = Force
q = density of air
Cw = drag coefficient (depends on shape)
A = frontal area
v = speed

As you can see the speed makes the force it takes to push the car forward go up exponentially.

Should be enough math for today!
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  #309  
Old 06-17-2004, 05:08 PM
crank throw wei crank throw wei is offline
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Quote:
Originally Posted by racerrandy
Where are you guys gonna put a motorcycle engine at on this 40" long beast.
That was an obvious exaggeration to illustrate a point.BTW,the 650 sitting in my garage is 14" front to back.
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  #310  
Old 06-17-2004, 05:15 PM
mgs9 mgs9 is offline
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*?

are you sure thats going to work, Because of the weight i mean you double the weight you need four times the power and that wuld probly be like tripling the weight.
Just a thought

Last edited by mgs9; 06-17-2004 at 05:19 PM. Reason: *?
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  #311  
Old 06-17-2004, 06:04 PM
DCLXVI DCLXVI is offline
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Well, since he would have about 100 times the power of a good .21 I'd guess he's going to be in the "power requiremts meets delivered power" ballpark
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  #312  
Old 06-17-2004, 10:17 PM
racerrandy racerrandy is offline
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Well I thought it might but since I don't know you,

I think you get what I am saying too. I guess I am hoping people will keep this within the realm of true R/C.

But that is whats cool about this contest, if it meets the rules, bring it on!
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  #313  
Old 06-18-2004, 01:50 AM
Stocker452 Stocker452 is offline
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meh some of u just dont get it...this isnt drag racing, you dont have to get it up to speed in 3 seconds, HUGE MX engines (some1 mentioned a 650 cc engine i think...***!?!?!?!) thats way too big, to get all that torque to the ground u would need tires the same size as that engine, and a slipper clutch would prolly melt.

This is what I think a car needs:

-High RPM over torque..remember we arent dragging
-Insanely low CG...design chassis first, choose power later
-some 1/8 scale tires for some great traction
-High torque LOW speed servo...a high speed servo with result in twitching the car back and forth which WILL result in flipping...Torque for handling minor defects in surface
-This thing must go straight as a Rail
-Good Downforce...may involve designing your own bodies
-Extremly low resistence in Electronics and Drive Train
-and most importantly...Function OVER Form...who cares if it looks bad, if it works you can whoop every1's butt that says your car is stupid!
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  #314  
Old 06-18-2004, 03:53 AM
Mike Keeney Mike Keeney is offline
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Quote:
Originally Posted by Stocker452
meh some of u just dont get it...this isnt drag racing, you dont have to get it up to speed in 3 seconds, HUGE MX engines (some1 mentioned a 650 cc engine i think...***!?!?!?!) thats way too big, to get all that torque to the ground u would need tires the same size as that engine, and a slipper clutch would prolly melt.

This is what I think a car needs:

-High RPM over torque..remember we arent dragging
-Insanely low CG...design chassis first, choose power later
-some 1/8 scale tires for some great traction
-High torque LOW speed servo...a high speed servo with result in twitching the car back and forth which WILL result in flipping...Torque for handling minor defects in surface
-This thing must go straight as a Rail
-Good Downforce...may involve designing your own bodies
-Extremly low resistence in Electronics and Drive Train
-and most importantly...Function OVER Form...who cares if it looks bad, if it works you can whoop every1's butt that says your car is stupid!
Then by all means, that's what you should bring.

So many unknowns, so little time.

Mike
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  #315  
Old 06-18-2004, 03:49 PM
RC-scientist RC-scientist is offline
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Look, I was trying to prove a point. What I dont like is with the dimension at 40" you can do what I talked about. A Kawasaki zx-10R can be fit into about 25 inches if needed. So then get some car tires, maybe some juior dragster tires and you are set. It is not RC anymore it is road racing at 40" plan and simple.

hopefully there will not be allot of fullsize engine cars and some inovative RC stuff but time will only tell.

BTW, I have made it past the 140mph mark, Hoepfully I will have a car that does at least 150mph by June, probably much faster. And this is a True RC car.. 22" long! I ws thinking about posting some pictures but I decided to post a Video of what a 125+ mph run looks like... It is going up on my website this weekend. You really dont see the car go by, you just hear it...

If anyone needs gears mades let me know. I have just made a few sets and they seem to be working great. It takes about 2 days to make them so I can have them to you in about 1 week.
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  #316  
Old 06-18-2004, 05:25 PM
mgs9 mgs9 is offline
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do you make both pinion and spur gears?
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  #317  
Old 06-20-2004, 06:39 PM
Fastcar Fastcar is offline
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I got a couple of quick questions...

1.Will the racing speed run area be sprayed with some sort of traction compound like sugar water, vht, or grape soda???

2. Is it true that at this speed run your gonna have make turns???

Fastcar
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  #318  
Old 06-20-2004, 06:57 PM
Chris LaPanse Chris LaPanse is offline
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1: I didn't know grape soda increased traction
2: Yes, unless you want to hit the wall. However, this is a race track for FULL SIZE cars. The RC cars should be able to make it with no problem
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  #319  
Old 06-20-2004, 08:38 PM
DualBL DualBL is offline
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rc-scientist, what's your site's url?
-Ncik
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  #320  
Old 06-21-2004, 05:24 PM
Fastcar Fastcar is offline
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turning shouldn't be a part of it.... looking for speed, not driving skills....
grape soda on the racing area....makes the track/racing area sticky so we can get some traction...

another Question
1. will the speed run be 300 feet... or however it takes to get to your top speed?
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  #321  
Old 06-21-2004, 06:42 PM
racerrandy racerrandy is offline
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Fastcar,the answer to your question is on the first page of this thread.
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  #322  
Old 06-21-2004, 07:01 PM
ExtremeMT ExtremeMT is offline
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Quote:
Originally Posted by PeterV
Vehicle speed will be measured by running the car through an electronic speed trap (likely to come from Race America), and you can use as much of the speedway as your radio range will allow to get up to speed.

I hope we see lots of creative stuff. A monster truck may not challenge Cliff Lett's 111mph record, but it sure would be cool to see a monster pushing 80mph! I'd love to see a three-wheeler in the mix, motorcycles, a Tamiya King Hauler with 100 cells in the trailer...wild stuff.

Hehehehe Im rethinking my plans for my NMT...(BTW My HPI NMT WILL be hitting atleast 80mph within 4-6months! )
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  #323  
Old 06-21-2004, 10:19 PM
mgs9 mgs9 is offline
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I think it would be funny and intresting to see somebody beef up a tank.
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  #324  
Old 06-22-2004, 03:09 AM
Mike Keeney Mike Keeney is offline
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Quote:
Originally Posted by Fastcar
I got a couple of quick questions...

1.Will the racing speed run area be sprayed with some sort of traction compound like sugar water, vht, or grape soda???
Fastcar
I'd bet the track owners wouldn't allow anything to be sprayed on the track. Their bread and butter comes from racing full sized cars and the track is likely just fine for that purpose.

Cheers,
Mike
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  #325  
Old 06-22-2004, 09:29 AM
Fastcar Fastcar is offline
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oh ok racerrandy
says as much room as needed..... but I thought a speed run was 300 feet..
Then its gonna be real tough get these cars to hook up and run big MPH...

Last edited by Fastcar; 06-22-2004 at 09:43 AM.
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