R/C Tech Forums

Go Back   R/C Tech Forums > General Forums > Nitro On-Road

Reply
 
Thread Tools Search this Thread
Old 06-16-2007, 01:14 AM   #1
Tech Master
 
ziggy12345's Avatar
 
Join Date: Jun 2003
Location: West Midlands, UK
Posts: 1,596
Default Speed run car

Here is a pic of my car i'm preparing for a speed run attempt. Basically its an Evolva front and back with a custom chasis and 3 x 0.21 engines installed.

The engines are JP R03, RB Xenon and a cheapo Sirio.

The engines are interlocked with drive belts and all power the rear axle and the car is rear wheel drive only. For testing I am using standard gearing and this will give me a top speed of around 65Mph. The plan is to replace the rear drive of 20 - 48 to 32 - 32 and this will give me a theoretical top speed of 165 mph

I know of other guys building electric cars for a speed run and one other with a small turbine in.

The present speed record is recognised as 134.2mph and we all hope to beat that.

I cant let the electric boys have it all there way so thought I would pitch in for us IC guys. Wish me luck!!
Attached Thumbnails
Speed run car-dscf2908.jpg  
ziggy12345 is offline   Reply With Quote
Old 06-16-2007, 01:21 AM   #2
Tech Addict
 
Join Date: Feb 2007
Posts: 511
Trader Rating: 1 (100%+)
Default

...
randay is offline   Reply With Quote
Old 06-16-2007, 01:39 AM   #3
Tech Master
 
Join Date: Jul 2003
Location: indpls,ind
Posts: 1,417
Default

Do you think that those 1/8 scale tires are going to be able to give you enough traction?? Good luck at your speed attemps.
nitrohead5300 is offline   Reply With Quote
Old 06-16-2007, 02:06 AM   #4
Tech Master
 
ziggy12345's Avatar
 
Join Date: Jun 2003
Location: West Midlands, UK
Posts: 1,596
Default

They will give enough traction but they might not stand the centrifugal force. Somebody told me they will blow up around 135 mph! I'll have to test them to find out

Cheers
ziggy12345 is offline   Reply With Quote
Old 06-16-2007, 05:23 AM   #5
Tech Addict
 
twiggy's Avatar
 
Join Date: Jan 2007
Location: sydney, australia
Posts: 710
Trader Rating: 2 (100%+)
Default

got any pics with the body off?
__________________
www.Moorebankraceway.com

Hamilton 2008 F1 champion!
twiggy is offline   Reply With Quote
Old 06-16-2007, 05:35 AM   #6
Tech Adept
 
Simon M's Avatar
 
Join Date: Apr 2007
Location: Sydney Australia
Posts: 189
Trader Rating: 4 (100%+)
Default

you can find more pics of this car at
http://www.fastrc.blogspot.com/
__________________
Serpent 960
Serpent 720
Serpent S400
Serpent S120
Tamiya M03-R
www.serpentradiocontrolcars.com.au
www.smaracing.org
Simon M is offline   Reply With Quote
Old 06-16-2007, 08:12 AM   #7
Tech Master
 
Join Date: Jul 2003
Location: indpls,ind
Posts: 1,417
Default

Hey Ziggy are you running a solid rear end??
nitrohead5300 is offline   Reply With Quote
Old 06-16-2007, 09:22 AM   #8
Tech Master
 
ziggy12345's Avatar
 
Join Date: Jun 2003
Location: West Midlands, UK
Posts: 1,596
Default

Yes a 1/8th solid rear end. I did a small vid of testing i did today. Istripped the middle belt again. I have ordered aluminium pulleys with steel re enforced belts 10mm wide. They should be here in a week

Here is the vid

http://www.youtube.com/watch?v=NnyDXLX0vfw
ziggy12345 is offline   Reply With Quote
Old 06-16-2007, 09:28 AM   #9
Tech Master
 
ziggy12345's Avatar
 
Join Date: Jun 2003
Location: West Midlands, UK
Posts: 1,596
Default

Here's my blog

http://ziggy12345-myspeedattemptcar.blogspot.com/

Cheers
ziggy12345 is offline   Reply With Quote
Old 06-16-2007, 03:37 PM   #10
Tech Adept
 
Join Date: Jun 2006
Location: Florida
Posts: 216
Default

Wow...that's pretty awesome. I noticed a few things that might complicate things...first of all, you might be going through side belts because you have three different types of engines, all wanting to turn at different speeds. Also what could cause a problem is the three different clutches not tuned exactly identical and three different engine tunes. Also, it's gonna be really hard to make all three two-speed transmissions shift at the same time...unless you don't plan on using it...just wanted to point that out...
Luke W is offline   Reply With Quote
Old 06-20-2007, 01:55 AM   #11
Tech Master
 
ziggy12345's Avatar
 
Join Date: Jun 2003
Location: West Midlands, UK
Posts: 1,596
Default

I have updated the blog. i am waiting for the middle pulleys and belts to do the first medium speed run. They will be arriving in a week

I will also try and test the 40 mhz rario range with 13 cells in the TX. This should give me the range I want

Cheers
__________________
Dedicated RC Car Speed Site

http://www.fast-rc.co.uk/forum/index.php

Sponsored by:
Norfolk and Chance
ziggy12345 is offline   Reply With Quote
Old 06-21-2007, 01:04 PM   #12
Tech Master
 
ziggy12345's Avatar
 
Join Date: Jun 2003
Location: West Midlands, UK
Posts: 1,596
Default

The belts arrived and I fitted the new pulleys and new 2.5mm pitch belts. After starting one engine a few revs and the belts snapped.

I figured out that the layshafts on the engines that are off are rotating and after a given rev limit the 2 peed engages and loads up the belts dramatically and snaps them.

I need to adjust the 2 speeds to come in late rand also only rev the engines when the 3 are running. I will fit the new 5mm pitch belts and try again

cheers
__________________
Dedicated RC Car Speed Site

http://www.fast-rc.co.uk/forum/index.php

Sponsored by:
Norfolk and Chance
ziggy12345 is offline   Reply With Quote
Old 06-21-2007, 04:59 PM   #13
Tech Master
 
Rapid Roy's Avatar
 
Join Date: Oct 2002
Location: L.A. (Rowland Hts)
Posts: 1,531
Default

Quote:
Originally Posted by ziggy12345 View Post
The belts arrived and I fitted the new pulleys and new 2.5mm pitch belts. After starting one engine a few revs and the belts snapped.

I figured out that the layshafts on the engines that are off are rotating and after a given rev limit the 2 peed engages and loads up the belts dramatically and snaps them.

I need to adjust the 2 speeds to come in late rand also only rev the engines when the 3 are running. I will fit the new 5mm pitch belts and try again

cheers
I would think that raising the engagement point of the 2 speeds will only make the problem worse because they will engage harder. You could run one way gears on the belt side to try and solve the problem. The only other suggestion I would have is to go to 2 engines and mate both clutch bells to the same spur gear. That way you only need one 2 speed. That would simplify your drive train consederably.
Rapid Roy is offline   Reply With Quote
Old 06-21-2007, 08:02 PM   #14
Tech Master
 
thamjk's Avatar
 
Join Date: Oct 2003
Posts: 1,193
Default

Very interesting topic.

I think if you have a 1-way pulley at each 3 main shaft on other side will gives you better in all these three engine power distributed to the rear wheel. It doesn't matter which engine engeage 2nd speed.

But one thing is the rear 1/8 tyre gives enought traction?
__________________
Serpent 710
Nova MAX
3PK
thamjk is offline   Reply With Quote
Old 06-22-2007, 01:04 AM   #15
Tech Master
 
ziggy12345's Avatar
 
Join Date: Jun 2003
Location: West Midlands, UK
Posts: 1,596
Default

I think a one way bearing will do the trick. Anybody know what car uses a one way on the 2nd speed clutch?

Cheers
__________________
Dedicated RC Car Speed Site

http://www.fast-rc.co.uk/forum/index.php

Sponsored by:
Norfolk and Chance
ziggy12345 is offline   Reply With Quote
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
speed passions granturismo speed control chad423 R/C Items: For Sale/Trade 16 08-24-2008 10:03 PM
speed passion granturismo speed control chad423 R/C Items: For Sale/Trade 4 07-11-2008 02:37 PM
Differences between o.s speed .21 v-spec speed alum and magnesium. Hans_Andersson Nitro Off-Road 11 06-23-2008 06:02 PM
speed passion GT speed control $140.00 shipped.. rc_tradingpost R/C Items: For Sale/Trade 4 05-12-2008 08:10 PM
Novak GTB Brushless 4 cell speed spectrum speed controller. jland R/C Items: For Sale/Trade 2 10-21-2007 02:37 PM



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search

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
Trackbacks are On
Pingbacks are On
Refbacks are Off



All times are GMT -7. It is currently 06:09 AM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
Powered By: vBulletin v3.9.2.1
Privacy Policy | Terms of Use | Advertise Content © 2001-2011 RCTech.net