Eagle
Goodfella
Posts: 2,228
|
Post by Eagle on Feb 19, 2018 12:26:08 GMT -5
I don't have all the fancy equipment you guys have.
That being said, along the same lines as Ember. I would test as is.
Test with weights as Ember suggests for speed and video to watch up close and slow to see car response.
Test with:
ALL cubes in the back and what ever is needed to bring up to weight on the right in front of the axle.
But, if the imbalance is as big of an issue as stated, unless the rules don't allow the old Cub Weights, I would put one of those in the right side to start with and/or do all the aforementioned again after doing so.
|
|
|
|
Post by Ember on Feb 19, 2018 13:14:14 GMT -5
Joe, if you want to push it a bit further, you could take the inside cube from the row you have two cubes in, and put it in the far rear location with the 3 cubes you'll be putting back there.You would only have a +8 leverage, and move your motor size from a 99 to a 102.I know for a fact a wheel weighted car with a +8 leverage can run very well. But again, a lot depends on how spongy your wheels are.I'm not sure how those light MA wheels would react with that much leverage on them through the transition.
The 99 and 102 motor sizes were calculated with a 6 factor at the back of the car, but as I've previously posted I think starting with a 10 is more accurate.If you started with a 10 factor in the rear slot, you would have a 193 +5 set-up with 3 cubes in the rear, and a 196 +8 set-up with 4 cubes in the rear.For reference a typical 4 row x 6 cubes would have a 192-0 rating.
|
|
|
|
Post by jspearm1983 on Feb 19, 2018 20:15:04 GMT -5
Joe, if you want to push it a bit further, you could take the inside cube from the row you have two cubes in, and put it in the far rear location with the 3 cubes you'll be putting back there.You would only have a +8 leverage, and move your motor size from a 99 to a 102.I know for a fact a wheel weighted car with a +8 leverage can run very well. But again, a lot depends on how spongy your wheels are.I'm not sure how those light MA wheels would react with that much leverage on them through the transition. The 99 and 102 motor sizes were calculated with a 6 factor at the back of the car, but as I've previously posted I think starting with a 10 is more accurate.If you started with a 10 factor in the rear slot, you would have a 193 +5 set-up with 3 cubes in the rear, and a 196 +8 set-up with 4 cubes in the rear.For reference a typical 4 row x 6 cubes would have a 192-0 rating. Ember, explain this witchcraft of coming up with these numbers. Did I miss this technique in a post somewhere? |
|
Eagle
Goodfella
Posts: 2,228
|
Post by Eagle on Feb 19, 2018 20:16:44 GMT -5
This should be good!
|
|
|
|
Post by Ember on Feb 19, 2018 20:21:52 GMT -5
|
|
|
|
Post by Professor Moriarty on Feb 19, 2018 20:25:11 GMT -5
It is the Leverage Calculator thread.
One thing that I question about the calculator is:
Is the geometry of the side weight taken into account? Because it has more tungsten below the axles than at the extreme forward and back of the sideweight.
|
|
Eagle
Goodfella
Posts: 2,228
|
Post by Eagle on Feb 19, 2018 20:32:10 GMT -5
Ember Thanks for linking over there. I didn't want to ask and am glad jspearm1983 did. I am pretty sure I would not be able to explain it for a bit. But, I like it.
I am also curious how rear axle placement and wheelbase fit into the equation if at all.
|
|
|
|
Post by Ember on Feb 19, 2018 20:43:17 GMT -5
Joe, as long as they're concentric it doesn't matter where the tungsten is as far as the rear leverage goes. You always have as much weight in front of the axle as behind it. However, It would give the car a lower center of gravity having the weights lower opposed to higher.
Think of a seesaw...if you had two identical weights sitting at opposing ends of a seesaw it would balance correct?...now if instead of the weights sitting on top of the seesaw, you hung them beneath with a string, wouldn't it still remain balanced ?
What if you left one weight on top and hung the other beneath, wouldn't it still remain balanced? Now of course for the sake of practicality we're not accounting for the weight of the string.
|
|
|
|
Post by Ember on Feb 19, 2018 20:50:36 GMT -5
Eagle...most everyone here assumes a 5/8" rear axle location, but that thread started because Loudon had to use the standard 7/8" location. You can see the example of his car and how the axle location comes into play. The leverage calculator always starts at the axle, regardless of where it's located, it's the fulcrum.
|
|
Eagle
Goodfella
Posts: 2,228
|
Post by Eagle on Feb 19, 2018 20:51:24 GMT -5
So, Ember if I understand what I just read. You are saying that placing weight higher in the car (lets say turning the cub weights upside down and putting them on top - something I would test - doesn't make any difference in the equation?
|
|
|
|
Post by Professor Moriarty on Feb 19, 2018 20:52:52 GMT -5
No... not the leverage...
How can it be calculated into the engine/horsepower?
wouldnt just a tiny bit be in the 6 slot and a larger amount in the 5 and 3 slot?
Maybe I’m a bit confused with it still... but if I only have a 93 compared to the classical setup of 92...then I should go more balls out than that!
|
|
Eagle
Goodfella
Posts: 2,228
|
Post by Eagle on Feb 19, 2018 20:53:35 GMT -5
If you haven't already answered - what if you turned them up and down with all the weight in the back - something else I would test.
|
|
|
|
Post by Ember on Feb 19, 2018 21:10:39 GMT -5
As far as the leverage and motor no, it doesn't matter if you turned them 180*, but it would make your car much more unstable with the higher COG. Now if you turned the weights 90* or 270* it sure would make a difference in both motor and leverage values.
|
|
|
|
Post by Ember on Feb 19, 2018 21:12:36 GMT -5
Joe you were going for more of a balanced car, so you sacrificed motor to gain balance, which could make for a faster car.
|
|
|
|
Post by Professor Moriarty on Feb 20, 2018 0:14:31 GMT -5
Joe you were going for more of a balanced car, so you sacrificed motor to gain balance, which could make for a faster car. Yeah... but... no need to be timid... right? Fortune favors the brave... maybe even another cube back there... 10 cubes... Cub Weights... This thing is gonna push the envelope like Chuck Yeager. |
|
