tag:blogger.com,1999:blog-9033006010530873827.post2937899916454250150..comments2024-03-28T00:22:16.515-07:00Comments on MostDece: WSC 2017 Cruiser Summarymostdecehttp://www.blogger.com/profile/17817140290262571411noreply@blogger.comBlogger21125tag:blogger.com,1999:blog-9033006010530873827.post-2210299626921747392018-05-15T09:42:48.343-07:002018-05-15T09:42:48.343-07:00This comment has been removed by the author.Greg Prosmushkinhttps://www.blogger.com/profile/06469085569109130005noreply@blogger.comtag:blogger.com,1999:blog-9033006010530873827.post-71367986072856484862017-10-04T16:46:48.422-07:002017-10-04T16:46:48.422-07:00As an internet spectator of this event, this infor...As an internet spectator of this event, this information is very helpful. Thank you. Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-9033006010530873827.post-40057572213390883732017-09-29T12:29:54.169-07:002017-09-29T12:29:54.169-07:00I would be pretty surprised if the 'B'WSC ...I would be pretty surprised if the 'B'WSC imposed that limit.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-9033006010530873827.post-66986089027043385992017-09-29T11:10:24.847-07:002017-09-29T11:10:24.847-07:00Hmmmm. Well, five of the seven cars that seat more...Hmmmm. Well, five of the seven cars that seat more than two people are on the Bridgestone tires sponsor list - Tehran and Flinders are the two exceptions. We'll have to see if WSC limits the number of people they can carry based on the load rating of their non-Bridgestone tires. Tehran's car in particular looks extremely heavy...mostdecehttps://www.blogger.com/profile/17817140290262571411noreply@blogger.comtag:blogger.com,1999:blog-9033006010530873827.post-7187745513773934762017-09-29T04:45:26.324-07:002017-09-29T04:45:26.324-07:00Schwalbe had meetings this month to discuss any co...Schwalbe had meetings this month to discuss any continuing production of tires. They decided to not produce any. There will be no bulk orders.<br /><br />In reply to Mostdece, I do not have a data sheet. I just know that one of the cruisers competing this year would have overloaded the 150kg tires, but came in under the load limit for the Bridgestone. I can't provide any more detail than that.<br /><br />In response to Nigels R/R question. I think most widely available scooter tires have a pressure rating of 30-40psi. The solar car specific tires are 70-100psi. That is a significant difference. I have also seen results from coast-down tests comparing the two and the car was able to coast about 3 times farther on solar car tires than scooter tires.<br /><br />I am interested to see what all of the teams at WSC will be using, for sure.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-9033006010530873827.post-34743507234332496952017-09-28T20:19:30.881-07:002017-09-28T20:19:30.881-07:00Ah, the mystery is solved. Now we can just specula...Ah, the mystery is solved. Now we can just speculate as to why they have the curved trunk instead of a few more rows of cells in back.TheExpress35noreply@blogger.comtag:blogger.com,1999:blog-9033006010530873827.post-79340071300847026172017-09-28T20:08:41.067-07:002017-09-28T20:08:41.067-07:00First array looks like a wet encapsulated top-cont...First array looks like a wet encapsulated top-contact array, those cells are often larger than the Sunpower cells:<br /><br />https://www.facebook.com/PrISUm.Solar.Car/photos/pcb.1767169229964866/1767168886631567/?type=3&theater<br /><br />https://www.facebook.com/PrISUm.Solar.Car/photos/pcb.1772433432771779/1772432569438532/?type=3&theater<br /><br />They made a whole new array, hood and roof. Note that the front corners of the old roof array are only missing 3 cells each, the new roof array cuts 4 cells on each front corner of the roof.mostdecehttps://www.blogger.com/profile/17817140290262571411noreply@blogger.comtag:blogger.com,1999:blog-9033006010530873827.post-32921083587082213202017-09-28T19:59:37.137-07:002017-09-28T19:59:37.137-07:00I think they made a new front array sometime after...I think they made a new front array sometime after their big tour of IowaTheExpress35noreply@blogger.comtag:blogger.com,1999:blog-9033006010530873827.post-72184398924131034022017-09-28T19:56:33.110-07:002017-09-28T19:56:33.110-07:00Ok now I'm confused, try counting this pic:
ht...Ok now I'm confused, try counting this pic:<br />https://scontent-ort2-2.xx.fbcdn.net/v/t1.0-9/19275213_1783551471659975_8301097377917923862_n.jpg?oh=12c90661831b2c5f6ce1f45fdf90e699&oe=5A4BE628TheExpress35noreply@blogger.comtag:blogger.com,1999:blog-9033006010530873827.post-50972122362665725812017-09-28T19:46:02.166-07:002017-09-28T19:46:02.166-07:00https://twitter.com/IowaStateUNews/status/90838589...https://twitter.com/IowaStateUNews/status/908385894469656576<br /><br />13 wide x 9 long, yes? = 117. Minus the two missing on the corners, 115.mostdecehttps://www.blogger.com/profile/17817140290262571411noreply@blogger.comtag:blogger.com,1999:blog-9033006010530873827.post-82496247671006534762017-09-28T19:35:30.966-07:002017-09-28T19:35:30.966-07:00I counted 94 on the hood.I counted 94 on the hood.TheExpress35noreply@blogger.comtag:blogger.com,1999:blog-9033006010530873827.post-20901963783746485752017-09-28T16:14:24.917-07:002017-09-28T16:14:24.917-07:00Hmmm, I count 269, but yes - barely more than 4sqm...Hmmm, I count 269, but yes - barely more than 4sqm of cells on the exterior of the car.<br /><br />(13W*9L panel on the hood, minus one cell on each front corner: 115 total on the hood. 12W*14L panel on the roof, minus 3 on each rear corner and 4 on each front corner: 154 total on the roof).mostdecehttps://www.blogger.com/profile/17817140290262571411noreply@blogger.comtag:blogger.com,1999:blog-9033006010530873827.post-54244097299143608352017-09-28T15:52:40.595-07:002017-09-28T15:52:40.595-07:00Crap, really? I went and did a solar cell count on...Crap, really? I went and did a solar cell count on Eindhoven and Bochum to verify, but I assumed a car as boxy as Penumbra would obviously fit the full array. Is it significantly shorter than the maximum length? <br /><br />Just a lot of weirdo design decisions on that car...mostdecehttps://www.blogger.com/profile/17817140290262571411noreply@blogger.comtag:blogger.com,1999:blog-9033006010530873827.post-51540331180263504222017-09-28T13:40:36.524-07:002017-09-28T13:40:36.524-07:00Also note that PrISUm only has 250/325 solar cells...Also note that PrISUm only has 250/325 solar cells.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-9033006010530873827.post-83745742215367048292017-09-28T10:52:35.192-07:002017-09-28T10:52:35.192-07:00Re the Tyre situation.
I have seen a post, which ...Re the Tyre situation.<br /><br />I have seen a post, which I can't find now, from someone trying to get a bulk order of Schwalbe tyres together.<br /><br />Apparently they will make a batch of 50, which doesn't seem a huge order really.<br /><br />NigelAnonymousnoreply@blogger.comtag:blogger.com,1999:blog-9033006010530873827.post-45409337814969435742017-09-28T10:35:31.127-07:002017-09-28T10:35:31.127-07:00I can sympathise with that!
Your work is much app...I can sympathise with that!<br /><br />Your work is much appreciated.<br /><br />NigelAnonymousnoreply@blogger.comtag:blogger.com,1999:blog-9033006010530873827.post-66892040029363861602017-09-28T10:14:29.508-07:002017-09-28T10:14:29.508-07:00Correct, but discussing that in detail would have ...Correct, but discussing that in detail would have made this post even longer, and I'd already spent far too long revising and re-revising this...mostdecehttps://www.blogger.com/profile/17817140290262571411noreply@blogger.comtag:blogger.com,1999:blog-9033006010530873827.post-57405946346742907222017-09-28T10:11:19.762-07:002017-09-28T10:11:19.762-07:00If you have a current datasheet that you can you c...If you have a current datasheet that you can you can send me, could you forward it on to me at mostdece.solar@gmail.com? I'd be very interested to see it. I was under the impression that pretty much any and all details about the "Ologic" Ecopias were covered tightly by NDAs.<br /><br />I recall in 2015, the Challenger teams were lamenting how fragile the Ecopia tires were and how often they flatted. I'm assuming the 2017 tires have been improved, but still - I'm more than a little sketched out at the loads the 4/5 seat cars are going to be putting on those tires.<br /><br />An aside, the tire situation in solar car racing really sucks right now. All of the old 2.25" wide tires are out of production now, as is the Schwalbe 95/80R16. The only tires left are the Michelin Radial X (super expensive, restricted supply) and the Bridgestone "Ologic" Ecopia (Ultra-restricted supply, only available for WSC). I've heard a lot of American teams may be forced to use high rolling resistance scooter tires at ASC in 2018, simply because the special solar car tires are impossible to acquire. mostdecehttps://www.blogger.com/profile/17817140290262571411noreply@blogger.comtag:blogger.com,1999:blog-9033006010530873827.post-16111273046234444812017-09-28T08:27:22.461-07:002017-09-28T08:27:22.461-07:00Presumably the figures given by the manufacturers ...Presumably the figures given by the manufacturers for rolling resistance of solar car tyres would be based upon a loading lower than the maximum.<br /><br />If the narrow tyres are overloaded as we suspect then the actual rolling resistance will be higher due to increased deflection.<br /><br />Using a wider tyre with a load much lower than it would normally carry would mean that there would be less deflection than expected and therefore perhaps a lower R/R than predicted.<br /><br />So maybe not actually a tripling of R/R in reality?<br /><br />Nigel Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-9033006010530873827.post-46473704541416147702017-09-28T05:16:09.309-07:002017-09-28T05:16:09.309-07:00The Bridgestone Ecopia with Ologic has a stated lo...The Bridgestone Ecopia with Ologic has a stated load rating much higher than 150kg in the data sheet. However, based on its construction and performance I don't think it is really much more robust than the Michelin or Schwalbe. I think Bridgestone may have just erased the factor of safety from their technical specifications. If any teams are running Schwalbe tires they would have needed to purchase them as early as last year due to the end of production. Good for them if they got them. Although I would question their use (or the Michelin) on any Cruiser car due to the obvious overloading conditions. Realistically, the Cruiser cars really need to use better tires than the solar car specific options available. However that will probably triple the rolling resistance. That is why it is difficult to build a highly efficient and practical car.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-9033006010530873827.post-57876304960528215012017-09-28T01:22:28.964-07:002017-09-28T01:22:28.964-07:00Just a point of order and to make things even more...Just a point of order and to make things even more complicated - charging once instead of no times will not automatically halve your efficiency score.<br /><br />It will halve your energy efficiency value but because that value is then compared to the most efficient car and multiplied by 80 it can mean many things.<br /><br />If you are still the most efficient team it would have no effect on your score at all. Any other scenario is almost impossible to foretell because it is based on what your competition does.<br /><br />NigelAnonymousnoreply@blogger.com