Not-a-number Posted November 15, 2023 Share Posted November 15, 2023 4 hours ago, tortron said: How's that for project creep Yeah its gotta get a lot more out of hand if I want to have a chance of finishing it! Quote Link to comment Share on other sites More sharing options...
shrike Posted November 16, 2023 Share Posted November 16, 2023 Did the original chassis have the speed holes (dimples) in it? are you using similar materials or updated to modern specs? Quote Link to comment Share on other sites More sharing options...
Not-a-number Posted November 16, 2023 Share Posted November 16, 2023 1 hour ago, shrike said: Did the original chassis have the speed holes (dimples) in it? are you using similar materials or updated to modern specs? Yeah they do have speed holes. Backed with an ali sheet. Can see them here. Original material was a mild steel. Probably low grade (in todays standards and variable. ‘Low background’ pre war stuff so you can’t really buy that. So they’re done from G250 mild steel (I think, maybe it was G300). Either way, in theory significantly more consistent and stiffer than the original. 8 Quote Link to comment Share on other sites More sharing options...
shrike Posted November 16, 2023 Share Posted November 16, 2023 3 hours ago, Not-a-number said: Yeah they do have speed holes. Backed with an ali sheet. Can see them here. Original material was a mild steel. Probably low grade (in todays standards and variable. ‘Low background’ pre war stuff so you can’t really buy that. So they’re done from G250 mild steel (I think, maybe it was G300). Either way, in theory significantly more consistent and stiffer than the original. Awesome, is there any logic to the placement of the speed holes? are they actually dimpled or just hole sawed out? Guessing the backing was for weight saving/aerodynamics? Quote Link to comment Share on other sites More sharing options...
VitesseEFI Posted November 16, 2023 Share Posted November 16, 2023 Somehow I’ve not previously seen this thread… so I’ve just had the jaw-dropping experience of reading it from end to end Bloody hell…… no messing! Thought the block casting was epic… but that sump!! So he goes and makes several This does actually deserve the word AWESOME! 7 Quote Link to comment Share on other sites More sharing options...
dabuzz Posted November 16, 2023 Share Posted November 16, 2023 Just jaw dropping stuff, love this build Probably wasn't the done thing back then, but engineering some negative camber into it while you're there wouldn't be such a bad thing imo Quote Link to comment Share on other sites More sharing options...
Not-a-number Posted November 17, 2023 Share Posted November 17, 2023 20 hours ago, shrike said: Awesome, is there any logic to the placement of the speed holes? are they actually dimpled or just hole sawed out? Guessing the backing was for weight saving/aerodynamics? Seems like they put them everywhere they could except for main mounting points. Like engine, gearbox, bulkhead and braces. Left about ~30-40mm material from the edges and to each hole. Not dimpled just straight through. The holes save 7kg total. Which is a bit when the whole car had a max weight limit of 750kg. The Ali backing to the holes keeps everything closed off. Since thats the cockpit. Aero/keeping junk out 5 hours ago, dabuzz said: Just jaw dropping stuff, love this build Probably wasn't the done thing back then, but engineering some negative camber into it while you're there wouldn't be such a bad thing imo Not that Ive ever driven anything with positive camber but the prewar cars usually had it so that there was no scrub radius. Puts the contact patch right through the king pin to give light steering. 3 1 Quote Link to comment Share on other sites More sharing options...
Not-a-number Posted November 17, 2023 Share Posted November 17, 2023 7 hours ago, VitesseEFI said: Somehow I’ve not previously seen this thread… so I’ve just had the jaw-dropping experience of reading it from end to end Bloody hell…… no messing! Thought the block casting was epic… but that sump!! So he goes and makes several This does actually deserve the word AWESOME! Thanks appreciate it. Quote Link to comment Share on other sites More sharing options...
JustHarry Posted November 18, 2023 Share Posted November 18, 2023 23 hours ago, Not-a-number said: Not that Ive ever driven anything with positive camber but the prewar cars usually had it so that there was no scrub radius. Puts the contact patch right through the king pin to give light steering. On 17/11/2023 at 11:19, dabuzz said: Just jaw dropping stuff, love this build Probably wasn't the done thing back then, but engineering some negative camber into it while you're there wouldn't be such a bad thing imo Like @Not-a-number says for light steering is a big thing but its a major handling stability reason for having positive camber on beam axle vehicles. Negative camber creates positive scrub radius which makes them handle poorly. Surprisingly enough Bugatti had the front end alignment pretty well sorted for the wheel/tyre combos of the time 3 1 Quote Link to comment Share on other sites More sharing options...
anglia4 Posted February 9 Share Posted February 9 Looking good! I love a nice detailed 3D model. 1 Quote Link to comment Share on other sites More sharing options...
Not-a-number Posted February 11 Share Posted February 11 On 08/02/2024 at 20:41, anglia4 said: Looking good! I love a nice detailed 3D model. Thanks. Doing a proper 'functional' detailed CAD takes a lot of time. I think what I have now will keep me going for a while once I can start making things again! 3 Quote Link to comment Share on other sites More sharing options...
flyingbrick Posted February 11 Share Posted February 11 On 17/11/2023 at 17:00, Not-a-number said: Seems like they put them everywhere they could except for main mounting points. Like engine, gearbox, bulkhead and braces. Left about ~30-40mm material from the edges and to each hole. Not dimpled just straight through. The holes save 7kg total. Which is a bit when the whole car had a max weight limit of 750kg. The Ali backing to the holes keeps everything closed off. Since thats the cockpit. Aero/keeping junk out Not that Ive ever driven anything with positive camber but the prewar cars usually had it so that there was no scrub radius. Puts the contact patch right through the king pin to give light steering. came here to ask why they had positive camber- reason makes sense! Might look weird if you reduce it (I know you wont anyway because you want this thing to be as close to origional as possible) Quote Link to comment Share on other sites More sharing options...
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