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08-06-2022, 12:05 PM | #21 |
Rock Crawler Join Date: Mar 2021 Location: Santa Barbara
Posts: 659
| Re: How is Overdrive % calculated? |
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08-06-2022, 01:35 PM | #22 | |
I wanna be Dave Join Date: Sep 2019 Location: US
Posts: 2,408
| Re: How is Overdrive % calculated? Quote:
Hopefully, now that the typo has been corrected, can actually get an answer to the question. ~ More peace, love, laughter, & kindness would make the world a MUCH better place | |
08-06-2022, 03:13 PM | #23 | |
Rock Crawler Join Date: Mar 2021 Location: Santa Barbara
Posts: 659
| Re: How is Overdrive % calculated? Quote:
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08-06-2022, 03:50 PM | #24 | |
I wanna be Dave Join Date: Sep 2019 Location: US
Posts: 2,408
| Re: How is Overdrive % calculated? Quote:
~ More peace, love, laughter, & kindness would make the world a MUCH better place | |
08-06-2022, 03:55 PM | #25 |
Rock Crawler Join Date: Mar 2021 Location: Santa Barbara
Posts: 659
| Re: How is Overdrive % calculated?
20-14=6 (difference) (14+20)/2=17 (mean) |
08-06-2022, 04:40 PM | #26 |
I wanna be Dave Join Date: Sep 2019 Location: US
Posts: 2,408
| Re: How is Overdrive % calculated? Got ya. When I was in junior high & high school, I was a math whiz...ex. softmore year, I was the only softmore in a class full of seniors. But, as they say, "Don't use it, you lose it." ~ More peace, love, laughter, & kindness would make the world a MUCH better place |
08-07-2022, 06:17 AM | #27 |
I wanna be Dave Join Date: Sep 2019 Location: US
Posts: 2,408
| Re: How is Overdrive % calculated? I double-checked the formula you gave, using two tooth counts combo we all KNOW the OD percentaged of, and your "formula"doesn't calculate correctly. If the two gears were 15T & 20T, then everyone knows the OD would be 33.3333% OD, and with 12T & 18T, the OD would be 50%...I chose these two examples because the ODs are extremely obvious...yet, by your "formula", the supposed (and incorrect) ODs would have calculated to 28.57% & 40%, respectively, this showing your "divide the difference by the mean, and multiply by 100" formula is incorrect. ~ More peace, love, laughter, & kindness would make the world a MUCH better place |
08-07-2022, 01:22 PM | #28 | ||
Rock Crawler Join Date: Mar 2021 Location: Santa Barbara
Posts: 659
| Re: How is Overdrive % calculated? Quote:
This is a post from Holmes I read a while back that helped me understand how they calculated the OD in the TGH transmissions... Quote:
(1.9+2.6)/2 = 2.25 0.7/2.25 = 0.31111 0.311x100 = 31.1 Last edited by DRED805; 08-07-2022 at 02:00 PM. | ||
08-07-2022, 01:59 PM | #29 |
RCC Addict Join Date: Mar 2019 Location: Hemet
Posts: 1,211
| Re: How is Overdrive % calculated?
Plus vanquish already ADMITTED they screwed up. Yet nothings been done. This thread is irrelevant anymore Sent from my iPhone using Tapatalk |
08-07-2022, 02:04 PM | #30 | ||
I wanna be Dave Join Date: Sep 2019 Location: US
Posts: 2,408
| Re: How is Overdrive % calculated? Quote:
Again, there's a very specific reason I selected those two pinion/spur combos...because they have KNOWN overdrive percentages. By the formula you posted, you'd be falsely indicating these two known OF combos as something other then what they actually are. If I were to have used 20T & 10T, everyone knows that the OD would be 100% (1 rear rotation equals 2 front rotations)...yet, the formula you posted would try to (handedly) convince people that it was only 66.667% OD. I'm not here to argue. I'm just trying to get an accurate answer to the 20T/14T matter...or, to get an accurate formula. It's not that I "don't like" the formula you provided...it's just that, mathematically, the formula CAN'T be 'correct'. I might not be the math whiz I once was (there was a time I could calculate two different computations at the same time...in my head), but even basic math proves the formula 'incorrect'. The two (now three) examples above prove that...and, honestly, I don't get how you can't see that. After all, they are three of the easiest-to-prove OD percentages, and I purposely selected three of the easiest-to-calculate tooth counts combos. In the meantime, I am trying to see what I might be able to do about taking the formula you listed, and *modifying* it, so as to see if I can figure out numbers that actually work. If I figure it out, I will post it here...and, while I'm working on that, if you, offer anyone else, had a formula believed to be "correct", please, post it here. Quote:
~ More peace, love, laughter, & kindness would make the world a MUCH better place Last edited by Panther6834; 08-07-2022 at 02:34 PM. | ||
08-07-2022, 02:29 PM | #31 | |
Rock Crawler Join Date: Mar 2021 Location: Santa Barbara
Posts: 659
| Re: How is Overdrive % calculated? Quote:
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08-07-2022, 02:38 PM | #32 |
Rock Crawler Join Date: Mar 2021 Location: Santa Barbara
Posts: 659
| Re: How is Overdrive % calculated?
15 is 75% of 20, so 15 is 25% less than 20 20 is 33.3% more than 15 The difference is 25% of 20 The difference is 33.3% of 15 The averaged number is 28.57% so that there is no confusion on whether front or rear ratio is the point that the dig ratio is calculated off. Is any of this making sense yet? |
08-07-2022, 02:42 PM | #33 | |
I wanna be Dave Join Date: Sep 2019 Location: US
Posts: 2,408
| Re: How is Overdrive % calculated? Quote:
~ More peace, love, laughter, & kindness would make the world a MUCH better place | |
08-07-2022, 02:52 PM | #34 | |
Rock Crawler Join Date: Mar 2021 Location: Santa Barbara
Posts: 659
| Re: How is Overdrive % calculated? Quote:
https://www.youtube.com/watch?v=RZS3i59okq4 | |
08-07-2022, 03:14 PM | #35 | |
I wanna be Dave Join Date: Sep 2019 Location: US
Posts: 2,408
| Re: How is Overdrive % calculated? Quote:
If the pinion (the gear driving the rear) was 20T, and the spur (driving the front) was 15T, then, yes, it would be correct to say that the rear has 25% underdrive (compared to the front)...at the same time, it would ALSO be correct to say that the front has 33.334% overdrive. Put another way, saying 33% (rounded) front OD is EXACTLY the same as saying 25% rear underdrive. By the way, the only tooth counts combos that this could be said of are when the spur has a tooth count that's 75% of the pinion (16T/12T, 28T/21T, etc). When one thinks about it, this 33%OD/25%UD 'combo' it wow interesting...I could be wrong, but, I don't believe any other percentage combo (ie 33%OD/25%UD) are this "mathematically perfect". The other 'interesting' thing about this particular combo is that you don't need ANY formula to determine what the OD or UD percentages are, as both percentages are intrinsically obvious. ~ More peace, love, laughter, & kindness would make the world a MUCH better place | |
08-07-2022, 03:20 PM | #36 |
I wanna be Dave Join Date: Jun 2020 Location: The Big Island
Posts: 2,010
| Re: How is Overdrive % calculated? |
08-07-2022, 03:40 PM | #37 |
RCC Addict Join Date: Mar 2019 Location: Hemet
Posts: 1,211
| Re: How is Overdrive % calculated?
This post has become irrelevant because the original post was asking how VANQUISH came up with their overdrive numbers which are incorrect. You’ve been showed and told multiple times, yet continue to de-rail this post. Every time you post it’s just stirring up sh*t. The formula the major companies use is listed by [mention]DRED805 [/mention] and according to that they admitted fault. So you can say the math doesn’t add up. But it does and it was wrong. Sent from my iPhone using Tapatalk |
08-07-2022, 03:51 PM | #38 |
Rock Crawler Join Date: Mar 2021 Location: Santa Barbara
Posts: 659
| Re: How is Overdrive % calculated? I've given you the correct information. Provided multiple examples, and backed it up with text and video supporting the information from two major RC companies. I understand you want to be right, but you're not. There's nothing else I can say. If you don't get it, you don't get it.
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08-07-2022, 04:06 PM | #39 |
I wanna be Dave Join Date: Sep 2019 Location: US
Posts: 2,408
| Re: How is Overdrive % calculated?
Deleted. Somehow, tapatalk dbl-posted.
Last edited by Panther6834; 08-07-2022 at 04:39 PM. |
08-07-2022, 04:15 PM | #40 |
Rock Crawler Join Date: Mar 2021 Location: Santa Barbara
Posts: 659
| Re: How is Overdrive % calculated? The industry standard for calculating overdrive is to take the average of those two numbers. I really don't understand what's confusing about that.
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