For the non-Facebooker's here on Slotblog;
Posted 26 September 2017 - 02:51 PM
For the non-Facebooker's here on Slotblog;
Mike Swiss
Inventor of the Low CG guide flag 4/20/18
IRRA® Components Committee Chairman
Five-time USRA National Champion (two G7, one G27, two G7 Senior)
Two-time G7 World Champion (1988, 1990), eight G7 main appearances
Eight-time G7 King track single lap world record holder
17B West Ogden Ave., Westmont, IL 60559, (708) 203-8003, mikeswiss86@hotmail.com (also my PayPal address)
Note: Send all USPS packages and mail to: 692 Citadel Drive, Westmont, Illinois 60559
Posted 26 September 2017 - 02:59 PM
PS: I don't have any idea what the theory is on it, but it should be faster if your slot is filled with water.
Mike Swiss
Inventor of the Low CG guide flag 4/20/18
IRRA® Components Committee Chairman
Five-time USRA National Champion (two G7, one G27, two G7 Senior)
Two-time G7 World Champion (1988, 1990), eight G7 main appearances
Eight-time G7 King track single lap world record holder
17B West Ogden Ave., Westmont, IL 60559, (708) 203-8003, mikeswiss86@hotmail.com (also my PayPal address)
Note: Send all USPS packages and mail to: 692 Citadel Drive, Westmont, Illinois 60559
Posted 26 September 2017 - 03:10 PM
Posted 26 September 2017 - 03:16 PM
Does Evinrude make slot car motors?
Dennis Dominey
Lifelong half-assed slot racer
Posted 26 September 2017 - 04:31 PM
Posted 26 September 2017 - 04:42 PM
Posted 26 September 2017 - 05:03 PM
Posted 26 September 2017 - 06:30 PM
A motor is only as fast as the chassis it's in.
Dominic Luongo
Like Dominator Custom Chassis on Facebook
NERR photos from 2012-April 2016
NERR photos from 2016 to now
Posted 26 September 2017 - 06:58 PM
I have to admit, I was reluctant to believe the new style Red Fox was faster till I tried it myself. I will not pooh-pooh this guide till I try them. Obviously there is speed to be had with the guide that most of us so called "backyard engineers" don't fully understand. Is it the geometry? Is it from reduced friction because of the hardness of the material or the geometry? Is it a combination of the two?
Mike Swiss
Inventor of the Low CG guide flag 4/20/18
IRRA® Components Committee Chairman
Five-time USRA National Champion (two G7, one G27, two G7 Senior)
Two-time G7 World Champion (1988, 1990), eight G7 main appearances
Eight-time G7 King track single lap world record holder
17B West Ogden Ave., Westmont, IL 60559, (708) 203-8003, mikeswiss86@hotmail.com (also my PayPal address)
Note: Send all USPS packages and mail to: 692 Citadel Drive, Westmont, Illinois 60559
Posted 26 September 2017 - 07:18 PM
My two cents. Excuse the crude drawing but i think that the airfoil shape may be less drag against the sides of the slot. The top shows the straight guide with possibly the whole side of the guide touching the slot. The airfoil shape has a smaller area that would touch the slot at any given time. The arrows point to the area that would be touching the slot. Again just my tow cents.
Posted 26 September 2017 - 07:36 PM
Mike Swiss
Inventor of the Low CG guide flag 4/20/18
IRRA® Components Committee Chairman
Five-time USRA National Champion (two G7, one G27, two G7 Senior)
Two-time G7 World Champion (1988, 1990), eight G7 main appearances
Eight-time G7 King track single lap world record holder
17B West Ogden Ave., Westmont, IL 60559, (708) 203-8003, mikeswiss86@hotmail.com (also my PayPal address)
Note: Send all USPS packages and mail to: 692 Citadel Drive, Westmont, Illinois 60559
Posted 26 September 2017 - 09:46 PM
and someone sold a flag with large, round, slight depressions in the sides of the blade,
Posted 26 September 2017 - 09:50 PM
Posted 26 September 2017 - 10:15 PM
Slick 7 made those. The relief filled up with gunk.
Mike Swiss
Inventor of the Low CG guide flag 4/20/18
IRRA® Components Committee Chairman
Five-time USRA National Champion (two G7, one G27, two G7 Senior)
Two-time G7 World Champion (1988, 1990), eight G7 main appearances
Eight-time G7 King track single lap world record holder
17B West Ogden Ave., Westmont, IL 60559, (708) 203-8003, mikeswiss86@hotmail.com (also my PayPal address)
Note: Send all USPS packages and mail to: 692 Citadel Drive, Westmont, Illinois 60559
Posted 26 September 2017 - 10:27 PM
Anthony 'Tonyp' Przybylowicz
5/28/50-12/20/21
Requiescat in Pace
Posted 26 September 2017 - 11:10 PM
Mike Swiss
Inventor of the Low CG guide flag 4/20/18
IRRA® Components Committee Chairman
Five-time USRA National Champion (two G7, one G27, two G7 Senior)
Two-time G7 World Champion (1988, 1990), eight G7 main appearances
Eight-time G7 King track single lap world record holder
17B West Ogden Ave., Westmont, IL 60559, (708) 203-8003, mikeswiss86@hotmail.com (also my PayPal address)
Note: Send all USPS packages and mail to: 692 Citadel Drive, Westmont, Illinois 60559
Posted 27 September 2017 - 09:56 AM
Posted 27 September 2017 - 10:15 AM
Posted 27 September 2017 - 10:22 AM
Not sure about the validity of the physics on this one. The widest point is in front of the post (pivot) which would steer the guide to the other side, causing it to bump from side to side on the straight sections when it seems obvious it would be preferable to spend the least amount of time in contact with the slot vertical walls (less friction drag running right down the middle, not contacting either side excessively). It might not be a time duration issue but one of friction generated by the magnitude of the side (normal) force. If it actually helps to minimize that time (or force) of contact, then that would be faster.
I can't even begin to speculate on what is happening in the corners. I have done computer simulations of slot contact using Adams high-end Multi-Body Dynamics software (it's what I have been doing for all of my employers since becoming an Applications Engineer for the company, now MSC, 20 years ago).
These simulations consistently show that the guide initially hits the slot wall HARD in the corners, then bounce to the inside wall, then less hard to the outside wall until about 90 degrees in where it stops bouncing and lays against the outside wall of the slot so it remains in contact for the second half of a typical 180 degree corner (flat or banked).
Knowing this has not caused me to change my chassis designs nor my driving style so it's not done me any good. I've said it before; the more I try to apply real engineering to slot cars, the less I know about what makes them work. It humbles me every time I try. I offer these observations because it might give others some ideas...
What is important to know is that the friction is independent of the area of contact area, a fact I learned in high school physics (thanks, Mr. Williams, a personality very reminiscent of Mike Swiss - I'll just bet Nelson will agree!) but many degree holding mechanical engineers don't know this when quizzed on it. They go to the intuitive answer - more contact area creates more friction and it is never true (unless there is adhesive or high coefficient of friction fluid present). The physics math couldn't be more clear and Mr. Williams demonstrated this convincingly.
In the mean time, I certainly applaud the efforts to try something new. The simulation models respond to the shape of the contact so I can try this "aero wing chord" shape in Adams and see what it actually does - in theory, of course, as there are just so many variables in the modeling. I am working with Adams every day and it could be a nice evening project.
Keep it in the slot (never more profoundly and appropriately expressed),
AJ
Sorry about the nerf. "Sorry? Sorry? There's no apologizing in slot car racing!"
Besides, where would I even begin? I should probably start with my wife ...
"I don't often get very many "fast laps" but I very often get many laps quickly." ™
The only thing I know about slot cars is if I had a good time when I leave the building! I can count the times I didn't on one two three hands!
Former Home Track - Slot Car Speedway and Hobbies, Longmont, CO (now at Duffy's Raceway), Noteworthy for the 155' Hillclimb track featuring the THUNDER-DONUT - "Two men enter; one man leaves!"
Posted 27 September 2017 - 10:29 AM
This sounds like a problem for Prof. Irwin Corey!
Dennis Dominey
Lifelong half-assed slot racer
Posted 27 September 2017 - 10:46 AM
Perhaps they were designed for the Falkland Islands campaign!
Posted 27 September 2017 - 12:23 PM
Wow, cool. I'm going to take a mill bastard to my Red Fox guides and hone them into shape!
Posted 27 September 2017 - 12:24 PM
What is important to know is that the friction is independent of the area of contact area, a fact I learned in high school physics (thanks, Mr. Williams, a personality very reminiscent of Mike Swiss - I'll just bet Nelson will agree!) but many degree holding mechanical engineers don't know this when quizzed on it. They go to the intuitive answer - more contact area creates more friction and it is never true (unless there is adhesive or high coefficient of friction fluid present). The physics math couldn't be more clear and Mr. Williams demonstrated this convincingly.
Mike Swiss
Inventor of the Low CG guide flag 4/20/18
IRRA® Components Committee Chairman
Five-time USRA National Champion (two G7, one G27, two G7 Senior)
Two-time G7 World Champion (1988, 1990), eight G7 main appearances
Eight-time G7 King track single lap world record holder
17B West Ogden Ave., Westmont, IL 60559, (708) 203-8003, mikeswiss86@hotmail.com (also my PayPal address)
Note: Send all USPS packages and mail to: 692 Citadel Drive, Westmont, Illinois 60559
Posted 27 September 2017 - 12:30 PM
Posted 27 September 2017 - 12:37 PM
Mike Swiss
Inventor of the Low CG guide flag 4/20/18
IRRA® Components Committee Chairman
Five-time USRA National Champion (two G7, one G27, two G7 Senior)
Two-time G7 World Champion (1988, 1990), eight G7 main appearances
Eight-time G7 King track single lap world record holder
17B West Ogden Ave., Westmont, IL 60559, (708) 203-8003, mikeswiss86@hotmail.com (also my PayPal address)
Note: Send all USPS packages and mail to: 692 Citadel Drive, Westmont, Illinois 60559