Anyone willing to guess?
- Thread starter Bullet
- Start date
That's good to know. I'am was a bit nervous about the car then I remembered it was a fun class, and said it is what it is!
Bullet said:
The next day or so I'll tape 3 more ounces to it and see how it runs. From the few that I have talked to that have tuned a 2.0 ounce car, the 3.12-3.15 seems right.
I'm glad to see this class will get a replay from time to time. In the face of the OVERWHELMING evidence that I was dead wrong on my calculation, I can only come to one of two possible conclusions.
A. I don't know physics.
B. No pros have cracked the code yet.
I am doubling down, and after using the times run at MOTM, I would put the correct car at 3.08 seconds, not much of a move from my perfect car { same COM and same COF} est. of 3.065, but a few changes have to be made to run and so we do not get the lower time, but we should be able to destroy those 3.13 times.
I wish I could build a car and prove it, but it takes a top builder to get down to these times. HINT: It is obvious and known by all. But overlooked.
A. I don't know physics.
B. No pros have cracked the code yet.
I am doubling down, and after using the times run at MOTM, I would put the correct car at 3.08 seconds, not much of a move from my perfect car { same COM and same COF} est. of 3.065, but a few changes have to be made to run and so we do not get the lower time, but we should be able to destroy those 3.13 times.
I wish I could build a car and prove it, but it takes a top builder to get down to these times. HINT: It is obvious and known by all. But overlooked.
I'm fairly confident it's not going to get much better than 3.13. Maybe 3.12's but even that I'm not real sure of. Physics is not our friend on this one.
txchemist said:
If the next race is too far off, might have to send a car in anyway to let you run it and comment.
At my age, I don't mind being wrong at all.
As we all saw, whatever the rules, the top pros will still win. Question. If your pack changed to a 2 oz. limit, and cut the block of wood down to be just under 2 oz. before handing them all out, would the overall spread as a % from winner to slowest be tighter, worse, or about the same? We all know the "rules makers" are always attempting to make it all "fair" At our packs, typical spread is winners~2.6 sec [ about a slow 3.1 on 42 ft track], slowest ( if they finish) around 3.5, so we have a 35% range.
Any thoughts?.
At my age, I don't mind being wrong at all.
As we all saw, whatever the rules, the top pros will still win. Question. If your pack changed to a 2 oz. limit, and cut the block of wood down to be just under 2 oz. before handing them all out, would the overall spread as a % from winner to slowest be tighter, worse, or about the same? We all know the "rules makers" are always attempting to make it all "fair" At our packs, typical spread is winners~2.6 sec [ about a slow 3.1 on 42 ft track], slowest ( if they finish) around 3.5, so we have a 35% range.
Any thoughts?.
I, for one, was a little surprised at how many GVNR cars did not have fenders. I would think the effect of wind resistance would be amplified.
Really wish I had time to build my own car in this class and hope to see it again next year.
Really wish I had time to build my own car in this class and hope to see it again next year.
I tell my scout leaders (we have 8 troops that belong to a larger unit): Just bring me the blocks, finished or unfinished, I'll drill the axle holes, AND if any one desires, I will cut the block down to any thinness, and cut out a weight pocket. My weight pockets are a series of holes large enough for any coin they choose (penny, nickel, quarter or dollar coin).
One scoutmaster brought me 20 blocks for axle holes and 3/8ths thickness. I went to the race, and even the boys who did little to the axle prep, still did fairly good. E.g. it evened up the field a lot.
One scoutmaster brought me 20 blocks for axle holes and 3/8ths thickness. I went to the race, and even the boys who did little to the axle prep, still did fairly good. E.g. it evened up the field a lot.
If you cut all the blocks for a Pack down to 3/8th", Opa is suggesting a tighter distribution, but if he drills all the axles- for sure the races will be closer. I had asked what folks thought of Packs using Gov type rules if the cars would be closer together than giving the kids the big block and a 5 oz. rule
I think the gap would widen by quite a bit. With the 2 ounces there is not enough momentum to keep the car moving at a decent pace. Just my logical thinking.
txchemist said:
All I know is we were the only car in the finals with no fenders and I will never do that again. The car was our
back up car for our pack scout race next month and i thought it was BAD FAST !!! Not saying we would have won
with fenders -----but ----- the difference between 3rd and 4th was .0003. Maybe I should make "Half-Fast" are #1 car
for our race.
back up car for our pack scout race next month and i thought it was BAD FAST !!! Not saying we would have won
with fenders -----but ----- the difference between 3rd and 4th was .0003. Maybe I should make "Half-Fast" are #1 car
for our race.
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