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Thread: Eds Lotus 116 GT3

  1. #1561
    Registered User Bren's Avatar
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    That looks bloody awesome mate, great work!!

  2. #1562
    GTFO of my ED doctor ed's Avatar
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    thanks guys. pretty happy with it. Needs a lot of hand finishing to get little defects out, i need to reflow some resin in dry spots, plus might drape another layer of 240 over the top. but ist 95% good, it all lines up, it bolts up like its supposed to, and now it looks like the geomery doesnt suck! win!
    Mit freundlichen Gre

    Quote Originally Posted by Keith Duckworth View Post
    "I think that in a racing engine, the closer it is to disintegrating, in general the better its performance will be "

  3. #1563
    Bannered takai's Avatar
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    Very nice.

    What are you using for smoke generation and wind?
    Chris
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  4. #1564
    GTFO of my ED doctor ed's Avatar
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    leaf blower and a football hooligan spec smoke flare

    rough as guts, i admit. leaf blower was inserted right at the front of the diffuser, and for all its flaws still clearly demonstrated that the flow stays attached to the diffuser surface. will look again once actually mounted on a moving vehicle, but atleast for now reassuringly no red flags of disaster
    Mit freundlichen Gre

    Quote Originally Posted by Keith Duckworth View Post
    "I think that in a racing engine, the closer it is to disintegrating, in general the better its performance will be "

  5. #1565
    GTFO of my ED doctor ed's Avatar
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    fyi - did some further local reinforcment and another simple Hand laid top layer yesterday... this time with 240gsm twill instead of the 200gsm which id run out of...

    holy crap, 240gsm is 11ty better than 200gsm. night and day difference in layup, wetting out, coverage, fabric flow etc. ill never get 200gsm again, so yeah, hot tip, dont fuck about with 200gsm, even if it is a more common and a bit cheaper, get the 240!
    Mit freundlichen Gre

    Quote Originally Posted by Keith Duckworth View Post
    "I think that in a racing engine, the closer it is to disintegrating, in general the better its performance will be "

  6. #1566
    GTFO of my ED doctor ed's Avatar
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    Quote Originally Posted by schnitzelburger View Post
    nice work bud, whats it weigh?
    6.8kg
    5 layers 2x 200cf, 1x 225csm, 1x 200cf, 1x 240cf. Reinforcement patches on stress points

    Not super lightweight, but respectable for its size. And its tough as fuck.

    Last edited by doctor ed; 07-06-19 at 05:52 AM.

  7. #1567
    Bannered takai's Avatar
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    6.8kg is pretty damn good for a piece that size that is going to see road debris hit it.

    Nice one.
    Chris
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    I never saw a wild thing sorry for itself. A small bird will drop frozen dead from a bough without ever having felt sorry for itself. - D.H.Lawrence

  8. #1568
    GTFO of my ED doctor ed's Avatar
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    yep, its not worked out too bad at all

    but how shit are the last bunch of photos? look ok on my phone, but at work now on the desktop, wow, theyre shit.
    Mit freundlichen Gre

    Quote Originally Posted by Keith Duckworth View Post
    "I think that in a racing engine, the closer it is to disintegrating, in general the better its performance will be "

  9. #1569
    Non Compos Mentos Gammaboy's Avatar
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    Good shit dude.
    "Where can we get hold of a Vincent Black Shadow?" "Whats that?" "A fantastic bike," I said. "The new model is something like two thousand cubic inches, developing two hundred brake-horsepower at four thousand revolutions per minute on a magnesium frame with two styrofoam seats and a total curb weight of exactly two hundred pounds."

  10. #1570
    Down with ma homies Greg Rust's Avatar
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    Great work on your first attempt, it's scary and fun.

    Not sure if I missed it but did you use a resin roller to push it into the tight spots?

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  11. #1571
    GTFO of my ED doctor ed's Avatar
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    Used small foam rollers. One of the (several) problems was im using an infusion resin, which is really low viscosity (also has the best temp tolerance of all the non post cure resins). Anyway, being really thin, it didnt really work into corners, kindve flowed in (and back out) by itself. Was a bit hard to control

  12. #1572
    Bannered takai's Avatar
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    Given that its now 'summer,' dare i ask how the gearbox is? :P
    Chris
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    I never saw a wild thing sorry for itself. A small bird will drop frozen dead from a bough without ever having felt sorry for itself. - D.H.Lawrence

  13. #1573
    GTFO of my ED doctor ed's Avatar
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    so picking back up on the BFW again...

    sketched up a modified GOE482 Airfoil



    sent the CAD of the airfoil off to a bloke in the UK who makes CNC hot-wired RC model wing cores. had a choice of foams, and went for a middle density open cell. slightly heavier, but as i also wanted to use the female cut parts to prep as moulds, i figured the higher density would work well to sand and finish to a good surface.





    maybe a little paranoid, but i had the cores cut with a central hole for a full length spar. as i got the cores cut in 100cm length, it also gave me something reliable and fixed to mount the 2 halves together into one massive solid span.

    for the 310mm chord i went with a 40mm dia spar, then spent a while umming and ahhing what i was going to slide in there. a nice 200cm long carbon tube would be nice, but in 40mm are fucking expensive. so went with some 40x1.0mm aluminium tube. relatively light, wayyy cheaper than carbon tube, and little more forgiving. though to be honest once skinned in CF, any benefit of some flexibility of the aluminium is going to amount to about naught.

    so yeah, slid the fuckers together (very tight fit over 100cm in both directions is a bitch to do carefully not otherwise fucking the foam cores) and happy days. worked out well.

    now i need to sit down and mount the negative parts to some plywood, somehow prep them as a mould, flow coat/release agent them etc. I've had some practice now, this will be the test











    Last edited by doctor ed; 09-06-19 at 05:10 AM.
    Mit freundlichen Gre

    Quote Originally Posted by Keith Duckworth View Post
    "I think that in a racing engine, the closer it is to disintegrating, in general the better its performance will be "

  14. #1574
    GTFO of my ED doctor ed's Avatar
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    Quote Originally Posted by takai View Post
    Given that its now 'summer,' dare i ask how the gearbox is? :P
    nope

    probably should start making a move on it, but got enough other shit going on to rationalise not doing it yet
    Mit freundlichen Gre

    Quote Originally Posted by Keith Duckworth View Post
    "I think that in a racing engine, the closer it is to disintegrating, in general the better its performance will be "

  15. #1575
    GTFO of my ED doctor ed's Avatar
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    first iteration i think will be low-mounted single element. ive got a second chord for a dual element (lower plane dedicated to the diffuser) in case i get excited, but looking at how the single plane sits, and how damn big it really is, i think a single plane will be way more than enough. anyway, something like the pics below. i didnt have my vernier bricks with me, so measurements were only down in multiple of whole bricks for demonstration purposes.

    so basically, low mounting the single plane will do a couple of things: it makes less downforce by not sitting up in the free airstream, but also make less drag. the sides (say 20-30% on each side) sit in pretty clear open space and should get a healthy direct airfeed. the middle will be less efficient as a wing in a pure downforce sense, but where it loses there, it gains by being in proximity to the central diffuser outlet, and will hopefully improve diffuser efficiency. so less direct downforce (and also les drag) but hopefully more diffuser action, and more downforce there with minimal drag penalty.

    in either case, eyeballing it its pretty overcapitalised on rear downforce at present. so ill get it finished and running like this. meanwhile ill also work on a solid ass front splitter to try and see than i don't underspear straight off corners







    and in 3D

    Last edited by doctor ed; 10-06-19 at 03:08 AM.

  16. #1576
    Non Compos Mentos Gammaboy's Avatar
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    I take that being able to see out the back is not a high priority!
    "Where can we get hold of a Vincent Black Shadow?" "Whats that?" "A fantastic bike," I said. "The new model is something like two thousand cubic inches, developing two hundred brake-horsepower at four thousand revolutions per minute on a magnesium frame with two styrofoam seats and a total curb weight of exactly two hundred pounds."

  17. #1577
    Registered User PXL265's Avatar
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    Obviously set up for driving in Asia, you certainly don't look behind you here....

    Sent from my XT1635-02 using Tapatalk

  18. #1578
    no mods, leave it stock Jack Nicholson's Avatar
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    One of those rear view mirrors with a screen in it will solve that.

    This sort of thing https://www.cesdeals.com/product/10i...FU0OKwoda7AAvw
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    People must assume you are some sort of drug dealer with all these nice cars turning up to a fibro home

  19. #1579
    GTFO of my ED doctor ed's Avatar
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    hadn't really thought about it tbh. the rear view is pretty fucked by the motor cover. camera and display an idea, but depending on what i end up using the car for, might not be necessary

    im getting longer stalks for the side mirrors, maybe that will be enough

    /optimism
    Mit freundlichen Gre

    Quote Originally Posted by Keith Duckworth View Post
    "I think that in a racing engine, the closer it is to disintegrating, in general the better its performance will be "

  20. #1580
    Registered User Banzai's Avatar
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    That's not much worse than a standard supercharged Exige. For some reason they have a factory fitted rear vision mirror but all you can see is the intercooler. That wing is a little bit wider than current V6 Exige 410s and 430s but not a huge amount.


    Lifting the wing up a few inches will make it more effective and you may not need it to be so wide. Also make sure the wing supports go all the way down to the rear subframe/chassis.
    If you dig a hole and it is in the wrong place, digging it deeper isn't going to help.

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  21. #1581
    GTFO of my ED doctor ed's Avatar
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    position as mentioned is a bit of a test of the diffuser, not just the wing... so at least at first I'm keen run it low, and do some testing and flow visualisation. easy fix to run it higher. and I've got a second smaller chord to run as a second element low for the diffuser alone, but yeah, first off single element, keep it simple.

    wing mounts:



    Mit freundlichen Gre

    Quote Originally Posted by Keith Duckworth View Post
    "I think that in a racing engine, the closer it is to disintegrating, in general the better its performance will be "

  22. #1582
    GTFO of my ED doctor ed's Avatar
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    made an MDF box for the foam core parts. was starting to get paranoid about busting it. alloy endplates are cadded up, and ill chat to the laser cutter tomorrow. vac gear is ready, new roll of 240gsm twill is ready. bring it on!





    and also got around to cutting and shutting an OEM rollbar cover/fascia to the GT3 clam. I've mounted the clam at a slightly lower angle, and due to sundry other tiny alignment errors all adding up at the end, the fucking thing never really sat right at the front. now i really want to get the roof on and finished, but that means the back needs to be finished. so digits extractus, time to get shit done

    Mit freundlichen Gre

    Quote Originally Posted by Keith Duckworth View Post
    "I think that in a racing engine, the closer it is to disintegrating, in general the better its performance will be "

  23. #1583
    Registered User Norbie's Avatar
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    "Cool."
    Norbie!

  24. #1584
    Registered User Bren's Avatar
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    Quote Originally Posted by Norbie View Post
    "Cool."
    I cam here to say this!!

  25. #1585
    GTFO of my ED doctor ed's Avatar
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    Scrubbed up ok

    Ridiculous amount of work altogether tho. Note to self: dont ever break this.




  26. #1586
    Non Compos Mentos Gammaboy's Avatar
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    You'd probably find plain weave easier to lay straight than Twill FWIW.
    "Where can we get hold of a Vincent Black Shadow?" "Whats that?" "A fantastic bike," I said. "The new model is something like two thousand cubic inches, developing two hundred brake-horsepower at four thousand revolutions per minute on a magnesium frame with two styrofoam seats and a total curb weight of exactly two hundred pounds."

  27. #1587
    GTFO of my ED doctor ed's Avatar
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    The laying up was the least work. Fucking mould/buck making, prep work etc. only to destroy it, and spend the next week cleaning the part of mould debris and fixing the surface finish. fuck that shit

  28. #1588
    GTFO of my ED doctor ed's Avatar
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    Underbody





    And stealing an idea from the v12 thread... got me one of these pumps from alibaba for the gearbox


  29. #1589
    Bannered takai's Avatar
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    Quote Originally Posted by doctor ed View Post
    Underbody





    And stealing an idea from the v12 thread... got me one of these pumps from alibaba for the gearbox

    Nice, interested in how the pump goes.
    Chris
    ------
    The new nugget
    I never saw a wild thing sorry for itself. A small bird will drop frozen dead from a bough without ever having felt sorry for itself. - D.H.Lawrence

  30. #1590
    GTFO of my ED doctor ed's Avatar
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    Quote Originally Posted by Gammaboy View Post
    I take that being able to see out the back is not a high priority!
    Quote Originally Posted by Jack Nicholson View Post
    One of those rear view mirrors with a screen in it will solve that.
    so following through on ^^^^ this

    bought myself a $30 chinabay wifi reversing camera. actually pretty cool. small, self-contained wifi network, basically has flylead 12v power wires, that's about it. hooked up the power, fucked around trying get an app that worked reliable (v-car app for what its worth)

    makes life a whole lot simpler when the dash is already an android tablet





    https://www.ebay.com.au/itm/HD-120-1...sAAOSwNndcpX0D
    Mit freundlichen Gre

    Quote Originally Posted by Keith Duckworth View Post
    "I think that in a racing engine, the closer it is to disintegrating, in general the better its performance will be "

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