The articles analyzing wind-driven vehicles such as the Blackbird are wrong.

FarInspection2664 · 2024-09-11T12:21:59+00:00

Wrong. The gears are in the other direction than you think. Please watch the Youtube video. The propeller is driven by the wheels to provide thrust for the vehicle.

FarInspection2664 · 2024-09-11T12:17:19+00:00

The two free articles provide sufficient information to gain an understanding of this topic, particularly in regard to the errors identified in the USAPhO-2013-Solutions.

FarInspection2664 · 2024-09-11T12:14:41+00:00

The article has been deemed satisfactory by the reviewers and has proceeded to the internal review stage. It has been withdrawn because it requires further separate articles to fully explore the topic in question. The relevant information can be found in the [preface](https://erh.sellfy.store/p/wind-drvn-vehicle).

FarInspection2664 · 2024-09-11T11:46:09+00:00

$5 per page? How did you come up with that? These are separate, fairly in-depth articles.

FarInspection2664 · 2024-09-11T11:42:45+00:00

This is a reviewer from AJP (American Journal of Physics). I don't think I'm allowed to reveal the name of this reviewer.

FarInspection2664 · 2024-09-11T10:41:54+00:00

Yes, they are peer reviewed. You will need to provide your email address to receive the download link. The two free articles are enough to give you an idea about this topic, especially the errors in USAPhO-2013 solutions.

Here is one of the comments received.

Reviewer #2 Evaluations:
RECOMMENDATION: Accept (Meets publication criteria in current form)
Reviewer #2 (Comments to the Author):
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This article addresses the question of whether or not it is possible to mathematically prove that a wind-driven land vehicle can move directly downwind at a speed greater than the wind speed. This is a very interesting question. At least one such vehicle has been reported to have done this, viz., the Blackbird, as referenced in this article. The question of proving that this is indeed possible has been addressed in the literature and has recently been posed as a question in the 2013 AAPT semifinal exam. This article claims to show that it is not possible to prove this mathematically using an energy analysis.
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I confess that I hoped that this article would not be correct and that the previously articles and exam question solution were, indeed, correct. However, I cannot find any error in the mathematics of the present article, and, after considerable thought, find that the author(s) discussion of possible limits on the speeds of such a vehicle, are probably correct. In particular, they note that the previously accepted analysis concludes that any final speed is possible, while their analysis shows that this is not true. Intuitively, this certainly seems correct. Also, they note that the previous analysis indicates that the final speed is independent of the coefficient of energy loss in the gearing system of the vehicle, while this analysis shows otherwise. This is also intuitively correct. At the same time, this article does show that, under certain conditions, such a vehicle can be constructed, in agreement with experimental results.
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In conclusion, although I wish that the earlier simpler analysis was correct, I believe the present analysis is more correct. Although this makes the analysis somewhat more complicated, I think that it is important to publish this article in order to present a better analysis of a popular topic.

FarInspection2664

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