Password: Log In:

Notices

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

Reply
 
Share Thread Tools Display Modes
  #576  
Old 05-02-2006, 08:06 PM
Combatcm's Avatar
Combatcm Combatcm is offline
Certifiable RC Zone Addict
 
Join Date: 11-26-2002
Location: NJ
Posts: 1,157
Thanks: 0
Thanked 0 Times in 0 Posts
Fastest speed is going to be 143.5 mph

Make sure somebody upload vids an hour after they get home from it.
Reply With Quote
  #577  
Old 05-03-2006, 05:42 AM
GordonFreeman GordonFreeman is offline
Member
 
Join Date: 12-15-2004
Posts: 452
Thanks: 0
Thanked 0 Times in 0 Posts
Can I use a fan to create ground "suction" under the vehicle?

This is a drag race now right?
Reply With Quote
  #578  
Old 05-04-2006, 06:18 AM
Craps Craps is offline
Certifiable RC Zone Addict
 
Join Date: 11-05-2003
Location: Mt. Holly, NC
Posts: 1,835
Thanks: 0
Thanked 0 Times in 0 Posts
Been testing on an 1/8th mile dragstrip with VHT sprayed on it. You can't even walk across the track without your shoes sticking to it. Just about walk out of your shoes if not careful. Traction and bite are not going to be a problem if the track is treated with VHT.
Reply With Quote
  #579  
Old 05-04-2006, 11:43 AM
mook mook is offline
Senior Member
 
Join Date: 06-22-2004
Location: UK
Posts: 510
Thanks: 0
Thanked 0 Times in 0 Posts
would the VHT effect the top speed at all?
Reply With Quote
  #580  
Old 05-04-2006, 01:54 PM
apollo apollo is offline
Certifiable RC Zone Addict
 
Join Date: 01-23-2006
Posts: 1,928
Thanks: 0
Thanked 0 Times in 0 Posts
it would proabaly cause excessive drag if its as sticky as Craps says
Reply With Quote
  #581  
Old 05-04-2006, 01:58 PM
Craps Craps is offline
Certifiable RC Zone Addict
 
Join Date: 11-05-2003
Location: Mt. Holly, NC
Posts: 1,835
Thanks: 0
Thanked 0 Times in 0 Posts
It is stickest from the launch pad and gets less sticky down the run due the amount of rubber laid down. Might be like flies on fly paper! LOL
Reply With Quote
  #582  
Old 05-05-2006, 10:40 AM
NotWalkinBlind's Avatar
NotWalkinBlind NotWalkinBlind is offline
Certifiable RC Addict
 
Join Date: 05-04-2004
Location: SC, USA
Posts: 5,012
Thanks: 0
Thanked 0 Times in 0 Posts
Fly paper... yeah! Can't you just see a car laboring to get outta there with the clutch taking all kinds of abuse?

Couldn't you position your car over to one side for the start? Isn't the treatment concentrated in the center where the full size cars' slicks are?
Reply With Quote
  #583  
Old 05-22-2006, 03:27 PM
party_wagon party_wagon is offline
Member
 
Join Date: 06-13-2005
Posts: 86
Thanks: 0
Thanked 0 Times in 0 Posts
Has anyone even considered building a chasis that will support the running hardware for a good fast racing go cart? They can push 100+ mph w/ an extra 120 pounds in them. I'm sure you could shrink one down to 40 inches in length and re gear it to drive untill you blister tires designed to withstand much more stress then r/c car tires.
Reply With Quote
  #584  
Old 05-22-2006, 07:51 PM
IBJAMMIN IBJAMMIN is offline
Member
 
Join Date: 02-18-2006
Posts: 353
Thanks: 0
Thanked 0 Times in 0 Posts
Why not use a go kart frame? 125 cc shifter kart with a air shifter and 12v motors for steering and brakes there is no limit on weight? just has to be under 40in? cut the frame down to fit 40in gear it up to run 200+ maybe a 6 speed wr 450 motor wow the posabilities?
Reply With Quote
  #585  
Old 05-22-2006, 08:04 PM
Craps Craps is offline
Certifiable RC Zone Addict
 
Join Date: 11-05-2003
Location: Mt. Holly, NC
Posts: 1,835
Thanks: 0
Thanked 0 Times in 0 Posts
Interesting!

I think you would have alot of servo problems and maybe radio/reciever problems with an high output ignition system on those motors. Shifter motors would be hard and expensive to get right to! 40" gets real small trying to fit a pipe and motor w/carbs and filters...then you have to have something that resembles a cockpit???

Too big for such a small size restriction!
Reply With Quote
  #586  
Old 05-22-2006, 08:05 PM
fasterthanspeed's Avatar
fasterthanspeed fasterthanspeed is offline
Senior Member
 
Join Date: 02-06-2006
Location: Brea, California
Posts: 745
Thanks: 0
Thanked 0 Times in 0 Posts
It would be hard to control a car that is the same length as it is wide. You could just use 1/5 scaes servos to control the vehicle. The only other thing is the price would be so great, because just for a decent gokart would be about 10000 dollars. Thats not including everything you would have to get after the gokart. If I had the money I would run a hayabusa engine with turbo and nitrous on a custom chassis. But I dont so my cars is going to be simpler.Just rc car motors.
Reply With Quote
  #587  
Old 05-22-2006, 09:52 PM
IBJAMMIN IBJAMMIN is offline
Member
 
Join Date: 02-18-2006
Posts: 353
Thanks: 0
Thanked 0 Times in 0 Posts
After seeing some of these turbo prop motors and other ideas on here the cost would not be that high you can pick up a good used sprint kart for around 1000 dollars with a yamaha 100cc motor and starter n spares I use to run a lay down road race kart with a 100cc motor top speed was about a 100mph down the staight with my lard ass in it. 1/5 scale servo's wont work you would have to use micro switches and relays to run 12v gear reduced motors there cheap though you can find them in junk yards in power seats and power doors on cars. as far as handling it only has to go straight?
Reply With Quote
  #588  
Old 05-22-2006, 11:27 PM
fasterthanspeed's Avatar
fasterthanspeed fasterthanspeed is offline
Senior Member
 
Join Date: 02-06-2006
Location: Brea, California
Posts: 745
Thanks: 0
Thanked 0 Times in 0 Posts
When it is shorter it is harder to keep straight. That is why top fuelers are so long. What do turbo props have to do with this conversation?Why wont 1/5 servos work?And youll also have a hard time keeping the karton the ground at thos speeds.
Reply With Quote
  #589  
Old 05-23-2006, 12:30 AM
griz11 griz11 is offline
Member
 
Join Date: 08-04-2005
Location: Granite Shoals Tx
Posts: 181
Thanks: 0
Thanked 1 Time in 1 Post
The real fastest R/C

I was told about a machine that is supposed to run this summer at one of the dry lakes. Its powered by a Apollo era F1 rocket engine and is designed to break the speed of sound in 1/4 mile. The thing produces over 17g's so a human can't pilot it. All done by R/C. If this puppy runs its numbers the contest will be a moot point But its not driving the axles so I guess it wouldn't count. But I'd sure pay to see it run.

Griz
Reply With Quote
  #590  
Old 05-23-2006, 05:21 AM
IBJAMMIN IBJAMMIN is offline
Member
 
Join Date: 02-18-2006
Posts: 353
Thanks: 0
Thanked 0 Times in 0 Posts
Well fasterthanspeed 1st off a sprint kart to start with is wider at its rear wheels then it's wheel base and they are probably the best handling vehicle you can get on a short track so I dought handling will be a problem 2nd a top fuel car is long to keep it from fliping over backwards not keep it going straight a rail does not have a body for downforce like a short wheelbase funny car? 3rd I was using the turbo prop motor as a price comparison? 4th 5th scale servo's would not be strong enough to turn a kart or push a brake pedal? 5th keeping a 120lb kart on the ground is much easier then a 7lb rc car at high speed?

looking at the spec's on a sprint kart the wheel base is 40in to start with so it would only have to be shortened about 10 or 12in the chassis is 25in wide in the back so you can move the rear wheels in a good 16 to 20in. the motor can be mounted where the seat normally would be to keep the weight bias in check?

Griz there was a guy about 25 years ago that put a small liquid fuel rocket in a kart and did exibition runs at the drag races he was in the 150mph range in the quarter mile.

Last edited by IBJAMMIN; 05-23-2006 at 05:54 AM.
Reply With Quote
  #591  
Old 05-23-2006, 06:48 AM
Craps Craps is offline
Certifiable RC Zone Addict
 
Join Date: 11-05-2003
Location: Mt. Holly, NC
Posts: 1,835
Thanks: 0
Thanked 0 Times in 0 Posts
You would have to custom build a chassis on a jig moving everything in like that and there is no way to keep a motor with carbs/filter and pipes with in 40" without something custom made like the pipe being custom made into 90 degree bend. What about clutches and gearing for that thing? The time you moved the wheelbase in you would not have much of body in front of and behind the wheels/tires that would close the wheelbase up real short that would make it not be practical because the more body to the front and rear of the wheels/tires the closer the wheelbase. You are going to have less that 12" between the front and rear tires by the time you put a body on it.

It is going to take a very powerful servo to turn that 100lb car and nobody has said anything about the ignition system affects on the radio/reciever. The Yamaha and most kart motors have alot higher output ignition than those weed eater motors they use on 1/4 scale cars with most 1/4 scale cars only needing at the most 400 feet. The 1/4 mile is 1,320 feet plus that distance again for shut down that totals over 2,600 feet of range if that length of track can be used. Even the Spektrum has a 3,000 feet range and who knows if the 2.4 ghz Spektrum system will work with those high output ignition systems on kart motors?

Interesting idea with alot of bugs to work out!
Reply With Quote
  #592  
Old 05-23-2006, 01:14 PM
Wjco5681 Wjco5681 is offline
New Member
 
Join Date: 03-09-2005
Location: Houston
Posts: 8
Thanks: 0
Thanked 0 Times in 0 Posts
Noone is going to build such a cart anyhow. But lets go ahead and "what if" it to death!!!!
Reply With Quote
  #593  
Old 05-23-2006, 01:30 PM
NotWalkinBlind's Avatar
NotWalkinBlind NotWalkinBlind is offline
Certifiable RC Addict
 
Join Date: 05-04-2004
Location: SC, USA
Posts: 5,012
Thanks: 0
Thanked 0 Times in 0 Posts
Indeed
Reply With Quote
  #594  
Old 05-23-2006, 02:58 PM
Craps Craps is offline
Certifiable RC Zone Addict
 
Join Date: 11-05-2003
Location: Mt. Holly, NC
Posts: 1,835
Thanks: 0
Thanked 0 Times in 0 Posts
Quote:
Originally Posted by Wjco5681
Noone is going to build such a cart anyhow. But lets go ahead and "what if" it to death!!!!
Noone...Who is Noone? Does he have pictures?
Reply With Quote
  #595  
Old 05-23-2006, 04:05 PM
IBJAMMIN IBJAMMIN is offline
Member
 
Join Date: 02-18-2006
Posts: 353
Thanks: 0
Thanked 0 Times in 0 Posts
I dont think radio interference will be a problem with the ignition system I just fired up my cr500 and held my rc18 up to the motor and the ignition system and not one glitch as far as distance I have run rc cars in the sand dunes and dry lake alot farther then a 1/4 mile. with clutches and gearing there are alot of options out there from motor clutches to axel clutches. the steering and brake servo's are no problem with a 12volt reversible motor out of a power window or power seat in a car?

IMO the fastest car is probably going to be a 1/8 scale on road car with a brushless lipo set up in it if they can keep the tires from exploding? all I'm trying to say is there are other options out there besides rc car based chassis and motors the kart running gear wheels tires and axel are going to hold up to high speed much better then rc based gear?

I work in the movie biz and have learned nothing is imposible I have seen full size cars rigged to run by remote control? so a kart would be very easy to rig my only problem is I'm going to be out of town for the next 6 weeks on a show and wont have the time to build it if they run it next year I will definetly be there with a kart based car ready to prove the what for and it cant work people wrong.?
Reply With Quote
  #596  
Old 05-23-2006, 04:38 PM
IBJAMMIN IBJAMMIN is offline
Member
 
Join Date: 02-18-2006
Posts: 353
Thanks: 0
Thanked 0 Times in 0 Posts
To bad they wont let thrust powered vehicles run I built this car around 15 years ago to run on the dry lake it's powered by a ducted fan out of a rc jet I had a afterburner set up on it and in testing tripled the thrust but had a melt down in static testing with just the fan and no afterburner this car has ran 84 mph on the dry lake with the afterburner or modern jet it should be able to run over 150mph
Attached Images
File Type: jpg MVC-002S.JPG (46.6 KB, 414 views)
Reply With Quote
  #597  
Old 05-23-2006, 04:52 PM
party_wagon party_wagon is offline
Member
 
Join Date: 06-13-2005
Posts: 86
Thanks: 0
Thanked 0 Times in 0 Posts
If you are having trouble with tires expanding too much then use a concept similar to that of monster truck racers. They take packing tape and turn the tire inside out and make a ring around it to prevent the tires from expanding into cooky cutters. If the right insert is made I believe that CA could keep the tires from exploding. Remeber they explode because they rip off of the side walls of the tire. Reduce the psi by about 1000% by gluing the middle of these tires down and this shouldn't be a problem as long as you keep the parts of the car out of the way of the big spinning tires. Perhaps if your adventurous enough you could run cart tires on an 1/8th mt w/ a brushless system. A good 15 volt lipo w/ the right bl will give you more power and speed then a nova 528 for about 10 minutes of run time. Now, lets go up that voltage to around 75 volts and watch how fast it goes. There are conversions to run bls in 1/8th scales on the market already. Now I'm sure a faster bl system that can operate on 75 volts and dump 8000 mah in around 15 seconds would be able to blister the track as well. Remeber an mt would give you enough room to drop a gigantic power plant and tons of cells. I'm sure you could fit 6+ 8k mah 15 volt lipos in there w/ no problems at all. You could also go for a more aggresive aproach in which you could possible be running 2k mah or so packs for the fast burst. If you could find a system that can handle 300 volts I'm sure its possible.
Reply With Quote
  #598  
Old 05-24-2006, 03:58 AM
IBJAMMIN IBJAMMIN is offline
Member
 
Join Date: 02-18-2006
Posts: 353
Thanks: 0
Thanked 0 Times in 0 Posts
Well I was doing some research to see what is out there kart wise and found this its a kids kart with a wheel base of 30in and 5in tires thats 35in OD from the back tire to the front tire with a live axel you can mount just about any motor to it very easy electric or gas it's 1800.00 RTR lol with a 50cc motor.

To get into the 150mph plus range I think this would be a great platform to start with?
Attached Images
File Type: jpg karts_kid_530.jpg (34.8 KB, 413 views)
Reply With Quote
  #599  
Old 05-24-2006, 05:03 PM
IBJAMMIN IBJAMMIN is offline
Member
 
Join Date: 02-18-2006
Posts: 353
Thanks: 0
Thanked 0 Times in 0 Posts
I know this has nothing to do with the rc speed chalenge but I found this pic while researching karts in the early 70's this guy built a rocket kart that ran the quarter mile in 6 seconds at 215mph WOW talk about balls must have been one hell of a ride he later up the speed to 253mph.

Take a look at the wings in front of the rear tires something to think about to help keep your car on the ground at high speed???
Attached Images
File Type: jpg McGlashan1.jpg (11.7 KB, 415 views)

Last edited by IBJAMMIN; 05-24-2006 at 05:13 PM.
Reply With Quote
  #600  
Old 05-29-2006, 05:48 AM
Craps Craps is offline
Certifiable RC Zone Addict
 
Join Date: 11-05-2003
Location: Mt. Holly, NC
Posts: 1,835
Thanks: 0
Thanked 0 Times in 0 Posts
Quote:
Originally Posted by IBJAMMIN
Well I was doing some research to see what is out there kart wise and found this its a kids kart with a wheel base of 30in and 5in tires thats 35in OD from the back tire to the front tire with a live axel you can mount just about any motor to it very easy electric or gas it's 1800.00 RTR lol with a 50cc motor.

To get into the 150mph plus range I think this would be a great platform to start with?
30 in wheelbase with 5 in wheels will give you 35 in from back of wheel rim on the rear to front of wheel rim on the front then add for the thickness of the rubber tire sidewall front and rear will give you over 40 inches. The front and rear frame rails go beyond this making it too big. Need to do alot of chopping and rewelding to make this work.
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

»Upcoming Races & Events



All times are GMT -4. The time now is 10:03 AM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.

Designed by: vBSkinworks



Privacy Policy | Terms of Use
2013 Air Age Media 88 Danbury Road, Wilton, CT 06897 (203) 431-9000  USA