<div dir="ltr">The Blackbird is not that hard to understand. When starting the drag, the wind makes it move in the direction of the wind. As the Blackbird gets closer to the wind speed, its momentum keeps it going. Then it makes a transition where the energy from the ducted fan harvest enough energy to drive the wheels and propel the vehicle into the wind.<span class="gmail_default" style="font-family:arial,sans-serif;font-size:large;color:rgb(255,255,255)"> </span><span class="gmail_default" style="font-family:arial,sans-serif;font-size:large;color:rgb(255,255,255)"> It may </span><br>The Dutch (mostly universities) make small vehicles that they race into the wind -- I think from a standing start.<br><br>See the attached image and <a href="https://en.wikipedia.org/wiki/Wind-powered_vehicle">https://en.wikipedia.org/wiki/Wind-powered_vehicle</a><br><br><br><br>On Tue, Jul 8, 2025 at 3:05 PM Donald Cooke via LCTG <<a href="mailto:lctg@lists.toku.us">lctg@lists.toku.us</a>> wrote:<br>><br>> Sorry about Blackbird wiki URL!<br>><br>> <a href="https://en.wikipedia.org/wiki/Blackbird_(wind-powered_vehicle)">https://en.wikipedia.org/wiki/Blackbird_(wind-powered_vehicle)</a><br>><br>><br>> Don Cooke, Site 523, 603.219.9259<br>><br>><br>> On Tue, Jul 8, 2025 at 11:25 AM Donald Cooke <<a href="mailto:doncooke2@gmail.com">doncooke2@gmail.com</a>> wrote:<br>>><br>>> I file this in the same part of my brain where I put Blackbird.<br>>><br>>> <a href="https://en.wikipedia.org/wiki/Blackbird_(wind-powered_vehicle)powered_vehicle">https://en.wikipedia.org/wiki/Blackbird_(wind-powered_vehicle)powered_vehicle</a>)<br>>><br>>> I don't know Rick, but I do know most of his buddies from SporTVision.<br>>><br>>><br>>> Don Cooke, Site 523, 603.219.9259<br>>><br>>><br>>> On Tue, Jul 8, 2025 at 9:57 AM Peter Albin via LCTG <<a href="mailto:lctg@lists.toku.us">lctg@lists.toku.us</a>> wrote:<br>>>><br>>>><br>>>> <a href="https://www.scientificamerican.com/article/maths-block-stacking-problem-has-a-preposterous-solution/">https://www.scientificamerican.com/article/maths-block-stacking-problem-has-a-preposterous-solution/</a><br>>>><br>>>> Peter<br>>>> ===============================================<br>>>> ::The Lexington Computer and Technology Group Mailing List::<br>>>> Reply goes to sender only; Reply All to send to list.<br>>>> Send to the list: <a href="mailto:LCTG@lists.toku.us">LCTG@lists.toku.us</a>      Message archives: <a href="http://lists.toku.us/pipermail/lctg-toku.us/">http://lists.toku.us/pipermail/lctg-toku.us/</a><br>>>> To subscribe: email <a href="mailto:lctg-subscribe@toku.us">lctg-subscribe@toku.us</a>  To unsubscribe: email <a href="mailto:lctg-unsubscribe@toku.us">lctg-unsubscribe@toku.us</a><br>>>> Future and Past meeting information: <a href="http://LCTG.toku.us">http://LCTG.toku.us</a><br>>>> List information: <a href="http://lists.toku.us/listinfo.cgi/lctg-toku.us">http://lists.toku.us/listinfo.cgi/lctg-toku.us</a><br>>>> This message was sent to <a href="mailto:doncooke2@gmail.com">doncooke2@gmail.com</a>.<br>>>> Set your list options: <a href="http://lists.toku.us/options.cgi/lctg-toku.us/doncooke2@gmail.com">http://lists.toku.us/options.cgi/lctg-toku.us/doncooke2@gmail.com</a><br>><br>> ===============================================<br>> ::The Lexington Computer and Technology Group Mailing List::<br>> Reply goes to sender only; Reply All to send to list.<br>> Send to the list: <a href="mailto:LCTG@lists.toku.us">LCTG@lists.toku.us</a>      Message archives: <a href="http://lists.toku.us/pipermail/lctg-toku.us/">http://lists.toku.us/pipermail/lctg-toku.us/</a><br>> To subscribe: email <a href="mailto:lctg-subscribe@toku.us">lctg-subscribe@toku.us</a>  To unsubscribe: email <a href="mailto:lctg-unsubscribe@toku.us">lctg-unsubscribe@toku.us</a><br>> Future and Past meeting information: <a href="http://LCTG.toku.us">http://LCTG.toku.us</a><br>> List information: <a href="http://lists.toku.us/listinfo.cgi/lctg-toku.us">http://lists.toku.us/listinfo.cgi/lctg-toku.us</a><br>> This message was sent to <a href="mailto:9423lew@gmail.com">9423lew@gmail.com</a>.<br>> Set your list options: <a href="http://lists.toku.us/options.cgi/lctg-toku.us/9423lew@gmail.com">http://lists.toku.us/options.cgi/lctg-toku.us/9423lew@gmail.com</a></div>