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  1. #1

    Quarter Scale Dragster

    G'Day everyone from Australia

    I have been tinkering on and off for the last few years with a Drag Rail
    All the designs came from my own twisted mind

    K&S 3/8" brass tube chassis/silver soldered
    (empty chassis weighs the same as a 1/10 nitro on road car)
    Junior Go-Kart front wheels are my rear wheels
    Stainless steel steam pipe rear axle
    Stainless 7/16" tube drop axle - front (this came from a beer brewery) Hmmmmmmm, beer!
    Hi - Tec 1/4 scale servos
    1/8" stainless TIG rods for linkages
    Aggressor FM 3 Ch radio
    3rd channel runs a Hi-Tec sail winch - this pulls a velcro strap that will deploy the chute
    Parachute? a golf umbrella with polyester cords
    Stainless steel 3 oz. hip flask for the fuel tank
    poulon 44 cc chainsaw engine (modified, of course!)
    35 ASA chain drive
    10 tooth steel gear at clutch bell
    20 tooth to 10 tooth splitter transmission all lightened industrial gears
    36 tooth steel rear sprocket
    Rear sprocket doubles as the disc brake
    Caliper is from an Industrial Strapping Machine's strap Dispenser (Cyklop)
    5mm alloy checker plate floor
    Duratrax failsafe
    front steering/geometry is all hand made/self straightening
    front wheels - came from an electric scooter called a "techno"
    front rims - 2 piece alloy (modified & balanced)
    Front steering rods + himey bars = 3/16" stainless tube with 4mm steel joints
    Pipe is custom made from lithographic plates (thin aluminium) all bonded with plasterer's tape and Devcon
    -- this should give me 16,000 RPM
    chainsaws normally get to 8,000 RPM, so it's going to be a "grenade" engine!!!
    rear wing will be made from carbon fibre arrow shafts + sheet aluminium
    body will be made from 0.8mm polycarb sheet

    It's on hold at the moment, cos I just got a 44" boat to play with!
    O.S 0.61 Nitro powered 4 lb.hull - fun fun fun!!!
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    Be professional, kind and courteous to everyone you meet while simultaneously formulating a plan in which to kill them.

  2. #2
    Anomie's Avatar
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    RE: Quarter Scale Dragster

    That's really awesome workmanship [sm=thumbs_up.gif]

    Designing some caster into the front end can be tricky, I know. Great job engineering the steering to center. My axles (for crawling) don't really have need of anything like that, and I'm glad I didn't have to work it out! The closeup picture showing the brake and chain drive really shows off your attention to detail, too. Too add in a scale parachute just blows my mind. Excellent! Those rear tires look totally scale also, with the stripe.

    How long is the entire chassis?

    It looks like a cool project!
    ~Reiko~

    My truck will run. I have foreseen it. It is my DENSITY.

  3. #3

    RE: Quarter Scale Dragster

    Looks great there. Nice work!
    For the awesome history of 1/4 scale including New Era, Raco and yankee visit www.quarterscalelegends.com

  4. #4
    Dr.ArmoMaxx's Avatar
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    RE: Quarter Scale Dragster

    WHoa...i really like the idea of disk brake/sprocket...very nice
    Full throttle or go home.

  5. #5

    RE: Quarter Scale Dragster

    Reiko,

    It's 7 feet long
    I could have extended the chassis a little more, but then I wouldn't be able to carry it around in my car
    No point in making a trailer!!

    I'll put some more photos on tonight re the front end/steering

    Darren
    Be professional, kind and courteous to everyone you meet while simultaneously formulating a plan in which to kill them.

  6. #6

    RE: Quarter Scale Dragster

    Do you mind if I post these pics on the quarterscale forum?
    For the awesome history of 1/4 scale including New Era, Raco and yankee visit www.quarterscalelegends.com

  7. #7

    RE: Quarter Scale Dragster

    Sure, go ahead!
    Just reply to me the thread you are posting then to, so I can see the reactions, too

    ONE DAY, I'll finish this damn thing!!
    Next mad invention in the pipeline = a Yamaha 100cc Alloy scooter
    Something I can jump on and RIDE!!!
    (Hopefully without any diastrous results)[X(]
    Be professional, kind and courteous to everyone you meet while simultaneously formulating a plan in which to kill them.

  8. #8

    RE: Quarter Scale Dragster

    http://www.quarterscalelegends.com/b...hp?p=2950#2950

    the guys really dig this kind of thing
    For the awesome history of 1/4 scale including New Era, Raco and yankee visit www.quarterscalelegends.com

  9. #9

    RE: Quarter Scale Dragster

    OK, some pics of the front
    I changed the C hubs late 2006 to accommodate some camber adjustments, too.
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    Be professional, kind and courteous to everyone you meet while simultaneously formulating a plan in which to kill them.

  10. #10
    NitroVette's Avatar
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    RE: Quarter Scale Dragster

    Very nice craftsmanship, be sure to follow up with more pics or video if possible.

  11. #11

    RE: Quarter Scale Dragster

    OK , I have some videos, but they are BIG (disk space, that is)

    I split a video into 2 parts, so they're small
    They are from around October 2006
    I doesn't look much different to now.
    I gave it a steet test over Christmas, but my modified clutch bell and standard clutch shoes didn't like each other very much[&o]
    I was standing behind the car, radio in one hand, other hand on the 'chute bolt.
    i was GASSING the throttle (as you do)
    and progressively pushing the rear end into the ground (load testing to the max!)

    the clutch exploded

    Lucky me - if I stood 1 or 2 inches to the right some more, I think they'd still be picking bits of metal out of my right shoulder[X(][X(][X(]
    Any how, back to the drawing board!!
    I have a chunk of round stock aluminium, (my rear hubs came from this)
    this will also make a flat disc with a small shoulder to keep the (new) clutch shoes expanding in a straight plane. The old way, they expanded in a curve, not flat - not a good thing, so I discovered[>:]
    I have to get off my lazy b*tt, and machine this spacer up.

    After that, I can give it another HAMMERING to see if all works OK under stress

    Road tests coming soon, I hope

    Cheers
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    Be professional, kind and courteous to everyone you meet while simultaneously formulating a plan in which to kill them.

  12. #12

    RE: Quarter Scale Dragster

    All right

    I now have posted 2 x videos on RCU

    Again, from 2006
    There's no roll cage on the chassis back then, no pipe was made at that time, either - so you can hear the real "chainsaw" sound. I only had a steel header pipe made at the time, and it was LOUD!!!!
    [:@]

    the chute (3rd channel is put to use here) is a Hi - Tec sail winch with cable drum- quarter scale. It does around 3 x revolutions start to finish. This in turn can pull about 10cm of the Velcro strip I made that keeps the 'chute in place.

    A good mate of mine owns an Auto Transmission business, and has ties to Drag racing - he's the one who showed me how to fold a 'chute so it deploys every time

    [sm=thumbs_up.gif]

    I still have to finish the paint off, too - 90's Toyota Mica Red (a group 3 metallic) looks deep when you hit it with a few coats of clear

    Have to be sure all the frame is finished first, though.

    Enjoy


    http://www.rcuvideos.com/item/CF2LMZZZ9VL42JZT



    http://www.rcuvideos.com/item/75MH96NFC1WNJHT1/theater

    hope this works





    Go HARD........... or GO HOME!!!!!




    Be professional, kind and courteous to everyone you meet while simultaneously formulating a plan in which to kill them.

  13. #13

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    RE: Quarter Scale Dragster

    Man that thing is by far the best rc car I have EVER seen. I cannot imagine how much time and effort you must have put into a project like that. What sort of drive ratio does it use?

    Maybe instead of rebuilding the cruddy clutches that come on those saws, you should consider a small go-kart clutch (and possibly a kart engine too ).

    I love the petrol tank [8D]

    Keep up the good work!!!

  14. #14

    RE: Quarter Scale Dragster

    Hi Sam,

    It's 7.2:1
    anything that has to be self-propelled must be 6:1

    Getting the revs that I can, this should roughly equate to the 100km/h club[8D]
    Hopefully I will push the envelope - my 20 tooth gear on the splitter can be changed to 19, 18, 17 &16 tooth
    these gears start out at 165 grams
    after machining, they're only 45 grams each!! Any lighter, and I reckon they will shear - best to leave SOME meat behind
    Rotational mass is highest at the rims/tyres - they weigh about 1/3rd of the whole car

    I can get my hands on magnesium rims, but this was never considered at the time I bought the first set of wheels
    I never thought it would become the monster it is today!!

    That's what you get for making the "man shed" so easy to stay in
    Be professional, kind and courteous to everyone you meet while simultaneously formulating a plan in which to kill them.

  15. #15

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    RE: Quarter Scale Dragster

    Even though the wheels may weigh a little bit more than the rest of the parts on the car, they still look sweet as [8D].

    Some day I really hope to have access to some machining equipment, then I might have a chance at making something as cool as this.

  16. #16

    RE: Quarter Scale Dragster

    Hi Sam,

    I looked at the scooter site - some good things on there!
    My Mk. 1 scooter was an old BMX - 10 bucks from a garage sale
    Got it home, cut it up with the angle grinder
    Stretched the frame with the tube that used to hold my TV antenna
    Plywood deck with skateboard grip tape
    2 x caliper brakes (by the way, steel rims are best.) my mk. 2 was for a mate, was a scooter from the toy shop
    had plastic rims, did 60km/h, but trying to stop was an impossibility - the caliper brakes shaved the plastic off the rims[X(]

    Back to the MK. 1
    Honda fire - fighting pump motor GX - 140 5h.p. 4 stroke
    the motor tips up by a foot lever on rear of deck
    steel bush on output shaft is forced against the rear tyre
    3rd brake - the bike had back-pedal brakes, so I rigged a reversible Z - link under the deck, with an adjustable turn-buckle to get the back-pedal brake to work via a foot pedal on the front of the deck.
    It's good for 35 km/h (not fast)
    It has carried 2 x blokes (175kg total) up a steep hill with no power loss at all[8D]
    throttle is a second brake lever on the hanldle bars

    Had to put a seat on it, cos' you can't wave while riding standing up!!
    Seat was changed for a springer version from an exercise bike (stops your eyeballs rattling around in your head)
    Good wide seat, cos' most exercise bike riders have big, fat *****es

    Mark 2 went fine, just couldn't stop if you needed to

    I'll dig up the photos of it and show the concept of the (much wilder) Mk.III

    See ya

    __________________________________________________ ______________________


    GO HARD or............ GO HOME!!!!!!

    Be professional, kind and courteous to everyone you meet while simultaneously formulating a plan in which to kill them.

  17. #17

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    RE: Quarter Scale Dragster

    Mudgy, when are you gonna run this beast again? I'm in sydney and I'd LOVE to see this thing for real, I have a 1/10th prostock dragster, I can only drool over yours - thats gotta be one of the neatest looking builds I've seen - congrats mate. If your keen to blow some minds PDNR run drag nights about 3 or 4 times a year out at penrith, should bring it down and show it off, today was round 1... rained out [] Or take it out to the nitro champs at wsid next week, something that good has to be shown off
    Rage Against The machine... I\'\'m not waiting another 10 years - I\'\'ll BE THERE

  18. #18

    RE: Quarter Scale Dragster

    G'Day MONAROMAN,

    I have been slack, I admit.
    I have been RC Boating, Buggy thrashing, (and working - there should be a law against that)
    Playing with my kids, etc. and I'm having a tough time to clean the bench, get tinkering again.

    I have visited the Panrith guys late 2005, and I was keen to give the 1/8th Buggy a go next time on - road (Hyper 7 pro)
    Jonathon at Auswide has fixed me up with road wheels & tyres, but I busted the rear shock tower doing jumps in a Quarry.
    (have to fix that, too!)
    I showed a few guys there my rail on my Mobile phone, and some said I'd be just getting up to speed when I would have to stop again!
    Also, because of it's sise, I'd be the only one in my class
    Racing the clock is what it's all about, I know, but it does look COOL when there's two of them, right?

    Perhaps someone else out there will be inspired to resurrect this sort of style - i.e.

    I'm not one ot these guys who shows photos of the same old same old blinged up shop car "look how much I SPENT"
    If you can't afford/find/wait for/repair the parts you want, then MAKE them!!![sm=wink_smile.gif]

    Where have all the craftsmen/tradesmen gone???

    Remember, out there in the field is ALWAYS one to two steps in front of manufacturing - that's what racing is for (R&D)


    HAVE A GO YOURSELF AND YOU MIGHT JUST BE SURPRISED [sm=idea.gif][sm=idea.gif]


    Be professional, kind and courteous to everyone you meet while simultaneously formulating a plan in which to kill them.

  19. #19
    Rs43EVOman's Avatar
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    RE: Quarter Scale Dragster

    man when you do run this thing, make sure you get video of it. This is definetly the coolest thing ive ever seen on this site, in 3 years.

  20. #20

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    RE: Quarter Scale Dragster

    Yeah Mudgy you have me thinking, 2 of them would look good side by side. I have bugger all metalwork skills tho, I'm a fridgy, but I have a mate who's very fastidious with metal, might have to get some ideas in his head.
    Yeah 40m is a bit too short to wind her out, but it'd be cool to show it off. I think there maybe another 1/4 scale top fueller around if you have never taken it to penrith, I think I heard a guy had one down there once, thought it must have been you.
    Have ya seen this guy's stuff?
    http://www.conleyprecision.com/609.htm
    Check out the 1/4 scale top fueller with a working V8 and supercharger option!
    Rage Against The machine... I\'\'m not waiting another 10 years - I\'\'ll BE THERE

  21. #21

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    RE: Quarter Scale Dragster

    hey mudgy what size tubing is that for the whole chassis,b/c i think i want to build one and race it around here and maybe make 2-3 and sell them to make a new class.for them.
    when you arent in the mud you arent having fun!!!β™*birdyβ™*customsβ™*

  22. #22

    RE: Quarter Scale Dragster

    bigmodman

    It's K&S brass tubing - 3/8" dia. the cross braces on floor level are 1/4"
    I sleeved the main rails wherever bolts go through
    5/32" tube (1/8" int. dia.) sleeves for my M3 bolts (all button head stainless cap screws, too - cos they LOOK GOOD)
    13/64" tube for my M4 bolts

    When I first had the rolling chassis complete, I got on top of it on my hands and knees - hands at the pipe end, knees about where the throttle servo lives
    no worries
    I'm 85kg, so I reckon it should hold together OK
    Chassis is designed to have no vertical flex (banana) - no horizontal flex
    BUT it can twist like a cork screw
    Just for fun, I capped off the 4 x tubes with bullet casings from the local firing range - the guys were keen to help out with some Smith & Wesson hand-gun shells
    [8D]
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    Be professional, kind and courteous to everyone you meet while simultaneously formulating a plan in which to kill them.

  23. #23

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    RE: Quarter Scale Dragster

    ok thanks for the help oh and how did you throw together the drivetrain like the front end and stuff.????
    when you arent in the mud you arent having fun!!!β™*birdyβ™*customsβ™*

  24. #24

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    RE: Quarter Scale Dragster

    oh and i like the whole bullet end caps thats just pure works manship that finishes it off.
    when you arent in the mud you arent having fun!!!β™*birdyβ™*customsβ™*

  25. #25
    Dr.ArmoMaxx's Avatar
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    RE: Quarter Scale Dragster

    DAMN


    Full throttle or go home.


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