Jump to content




Photo

The "no-brainer" chassis meets "short-light"


  • Please log in to reply
10 replies to this topic

#1 JimF

JimF

    Checkered Flag in Hand

  • Full Member
  • PipPipPipPipPipPip
  • 1,924 posts
  • Joined: 20-June 07
  • Gender:Male

Posted 08 August 2016 - 04:19 PM

As mentioned in the previous thread, the No Brainer, the Hybrid and the first two Short-Lights have been very good. The short Hybrid is one attempt to combine the qualities of two different chassis. This is another. All the NB series to date have been built with flat tracks and shorter Hillclimbs, Kinglemans and flattish King tracks in mind. They have all been dependably good, easy to drive and easy to tune. The Short Lights have been very fast but a little harder to find the exact sweet spot with the tires, motor, gearing, and even body choice. So, the Short Hybrid mentioned before was one path to hopefully combine the attributes of two chassis types. This one will hopefully combine the attributes of another two types.

 

Basic structure:

 

  • R-Geo shallow, angled face bracket hacked up for weight reduction.
  • R-Geo .040 "GVP" nosepiece.
  • 3 7/8 wb X .875 gl and 49 gr bare. About 89 gr. all up/no body.
  • Single main rail of .078 wire. Pan framework also .078 wire.
  • Initial plan was for single wire for pan frame but I was afraid it would be too light.

 

DSC02516.JPG

 

Rear Detail:

 

  • Chopped and channeled bracket.
  • 1/16" brass for the outrigger.
  • Outrigger bracketed fore and aft with .078 wire and "top locked" with .047.
  • Rear stops are 3/32 box tube w/.047 wire stop rod.

 

 

DSC02517.JPG

 

Front detail:

 

  • Tuning fork cutout is filled w/040 brass to match the rest of the nosepiece.
  • S-7 guide tongue on top of stock brass.
  • Hinge rods are .055 in 3/32 round tubes.
  • Front wing stops are 3/32" box tube w/.047 wire. Movement is minimal.

 

 

DSC02518.JPG

 

Bottom View:

 

 

DSC02519.JPG


  • Rick, Jencar17, Mike Jr and 4 others like this
Jim Fowler




#2 Dallas Jackson

Dallas Jackson

    On The Lead Lap

  • Full Member
  • PipPipPipPip
  • 323 posts
  • Joined: 07-May 08

Posted 08 August 2016 - 05:07 PM

Nice Chassis  !!!!!!!!!!!!!



#3 Tom Eatherly

Tom Eatherly

    Checkered Flag in Hand

  • Full Member
  • PipPipPipPipPipPip
  • 1,771 posts
  • Joined: 28-October 11
  • Gender:Male
  • Location:SoCal

Posted 08 August 2016 - 10:18 PM

Hmmm, looks good Jim. But, it's got some big shoes to fill with the NB. The NB is just SO EASY to run! Might take a while,but, Fiddler ain't done. :sun_bespectacled:


Tom Eatherly

#4 JimF

JimF

    Checkered Flag in Hand

  • Full Member
  • PipPipPipPipPipPip
  • 1,924 posts
  • Joined: 20-June 07
  • Gender:Male

Posted 09 August 2016 - 12:20 AM

Thanks Tom. Not really meant to fill the shoes (ie; replace) the current NB. This is another test of the shorter car concept and an effort to keep the speed of the shortie while getting at least some of the ease of the NB. Besides.......just another arrow in the quiver while I'm playing with all these variations.


  • Tim Neja and Lee Palmer like this
Jim Fowler

#5 Joexemm

Joexemm

    Mid-Pack Racer

  • Full Member
  • PipPipPip
  • 155 posts
  • Joined: 05-August 13
  • Gender:Male
  • Location:NJ

Posted 07 September 2016 - 08:01 AM

so when you say chopped and channeled the bracket you mean cut down on the material behind the axle and the two little cut outs where tuning forks would go under the bracket?

 

and yes im sitting here studying your builds Jim! I will build an A-main car one day!


Joseph Emm

 

"Success is the best Revenge".... - someone smart.

 

C.O.W. retro chassis Everyone that runs one knows Checkers or Wreckers

 

 


#6 JimF

JimF

    Checkered Flag in Hand

  • Full Member
  • PipPipPipPipPipPip
  • 1,924 posts
  • Joined: 20-June 07
  • Gender:Male

Posted 07 September 2016 - 10:45 AM

Joe:

 

First, this is a very shallow bracket meaning the axle holes are much closer to the bracket face than standard. So much so that a 27t crown is the biggest that fits. Aside from that, yes. Cut down the material behind the axle and surrounding the bearing holes. Also cut out the top part of the bracket above the motor bushing hole. Honestly, all these gyrations didn't produce very much in the way of net weight savings. I probably wouldn't bother with it again.


Jim Fowler

#7 James Grandi

James Grandi

    On The Lead Lap

  • Full Member
  • PipPipPipPip
  • 473 posts
  • Joined: 31-May 10
  • Gender:Male
  • Location:Cranston, RI

Posted 07 September 2016 - 05:31 PM

so when you say chopped and channeled the bracket you mean cut down on the material behind the axle and the two little cut outs where tuning forks would go under the bracket?

 

and yes im sitting here studying your builds Jim! I will build an A-main car one day!

 

You'll get there, you're not that far off. Your cars have a lot of good ideas in them, just needs a little refining. I'd be happy to work with you on setting something up at the track, test & tune it so to speak


  • Tim Neja and Samiam like this
James Grandi
obSCEne Chassis
HVR BB Fronts
Bodies by Weaver

"There is no such thing as a race you are destined to lose. You will always have a chance."
 

#8 Joexemm

Joexemm

    Mid-Pack Racer

  • Full Member
  • PipPipPip
  • 155 posts
  • Joined: 05-August 13
  • Gender:Male
  • Location:NJ

Posted 08 September 2016 - 12:18 PM

Thanks James! i think this time around ill be much better prepared. I was building cars like crazy to get them to the guys that wanted to come with me.  Now everyone has one and we can move forward on improving.  

 

Jim i guess you answered my next question too.  Is it worth the extra time. If the net gain is not much and i still have a min weight to reach then there really is no reason to do it. 

 

side note is anyone else having issues using this forum on tapatalk app for the phone?


Joseph Emm

 

"Success is the best Revenge".... - someone smart.

 

C.O.W. retro chassis Everyone that runs one knows Checkers or Wreckers

 

 


#9 Tim Neja

Tim Neja

    Grand Champion Poster

  • Full Member
  • PipPipPipPipPipPipPipPip
  • 5,516 posts
  • Joined: 11-June 07
  • Gender:Male
  • Location:Orange County

Posted 11 September 2016 - 12:06 AM

Tom E used Jim's No Brainer chassis  to knock me out of the A main today in qualifying!!! Nice run Tom--- I got him back in the main with the move up out of the B!! But that No Brainer is FAST!!


  • JimF and Tom Eatherly like this
She's real fine, my 409!!!

#10 JimF

JimF

    Checkered Flag in Hand

  • Full Member
  • PipPipPipPipPipPip
  • 1,924 posts
  • Joined: 20-June 07
  • Gender:Male

Posted 11 September 2016 - 12:26 AM

WTG Tom and nice comeback Timmy.


Jim Fowler

#11 Tom Eatherly

Tom Eatherly

    Checkered Flag in Hand

  • Full Member
  • PipPipPipPipPipPip
  • 1,771 posts
  • Joined: 28-October 11
  • Gender:Male
  • Location:SoCal

Posted 11 September 2016 - 06:34 PM

Jim,

 Between your chassis and the motor Mill put in there, Gadzooks, I had me a car! It handled so good, I came off once in the eight heats. And that was my fault, certainly not the car. Thanks Jim.


  • Joexemm likes this
Tom Eatherly





Electric Dreams Online Shop