Quarter Scale Dragster

Quarter Scale Dragster (Full Version)

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Mudgy -> Quarter Scale Dragster (4/25/2007 12:13 PM)
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!!![:D] 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! [:D] O.S 0.61 Nitro powered 4 lb.hull - fun fun fun!!!

Anomie -> RE: Quarter Scale Dragster (4/25/2007 3:01 PM)
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!

quarterscalelegends -> RE: Quarter Scale Dragster (4/25/2007 6:17 PM)
Looks great there. Nice work!

Dr.ArmoMaxx -> RE: Quarter Scale Dragster (4/25/2007 8:12 PM)
WHoa...i really like the idea of disk brake/sprocket...very nice [:D]

Mudgy -> RE: Quarter Scale Dragster (4/25/2007 11:30 PM)
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[:D] No point in making a trailer!! I'll put some more photos on tonight re the front end/steering Darren[;)]

quarterscalelegends -> RE: Quarter Scale Dragster (4/25/2007 11:53 PM)
Do you mind if I post these pics on the quarterscale forum?

Mudgy -> RE: Quarter Scale Dragster (4/26/2007 12:01 AM)
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(]

quarterscalelegends -> RE: Quarter Scale Dragster (4/26/2007 2:49 AM)
http://www.quarterscalelegends.com/bb/viewtopic.php?p=2950#2950 the guys really dig this kind of thing [;)]

Mudgy -> RE: Quarter Scale Dragster (4/26/2007 12:16 PM)
OK, some pics of the front I changed the C hubs late 2006 to accommodate some camber adjustments, too.

NitroVette -> RE: Quarter Scale Dragster (4/27/2007 12:48 AM)
Very nice craftsmanship, be sure to follow up with more pics or video if possible.

Mudgy -> RE: Quarter Scale Dragster (4/27/2007 12:04 PM)
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[;)]

Mudgy -> RE: Quarter Scale Dragster (4/27/2007 1:01 PM)
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!!!!!

sam123 -> RE: Quarter Scale Dragster (4/27/2007 1:07 PM)
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 [:D]). I love the petrol tank [8D] Keep up the good work!!!

Mudgy -> RE: Quarter Scale Dragster (4/27/2007 1:32 PM)
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[;)]

sam123 -> RE: Quarter Scale Dragster (4/27/2007 3:39 PM)
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.

MONAROMAN -> RE: Quarter Scale Dragster (4/28/2007 3:40 PM)
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 [:o] Or take it out to the nitro champs at wsid next week, something that good has to be shown off

Mudgy -> RE: Quarter Scale Dragster (4/29/2007 12:45 AM)
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?[:D] 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]

Rs43EVOman -> RE: Quarter Scale Dragster (4/29/2007 1:38 AM)
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.

MONAROMAN -> RE: Quarter Scale Dragster (4/29/2007 2:13 AM)
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!

bigmodman -> RE: Quarter Scale Dragster (4/29/2007 7:13 PM)
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.

Mudgy -> RE: Quarter Scale Dragster (4/30/2007 12:31 AM)
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 [:D] 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]

bigmodman -> RE: Quarter Scale Dragster (4/30/2007 3:51 AM)
ok thanks for the help oh and how did you throw together the drivetrain like the front end and stuff.????

bigmodman -> RE: Quarter Scale Dragster (4/30/2007 3:53 AM)
oh and i like the whole bullet end caps thats just pure works manship that finishes it off.

Mudgy -> RE: Quarter Scale Dragster (5/2/2007 10:14 AM)
bigmodman The front end is Stainless tube two sizes TIG welded together I made the alloy brackets from 8mm plate I machined 2 x collars to take M6 bolts to hold the C hubs I used "Nord-lock" washers to hold the C hubs to the tube/sleeves (an aircraft washer - look them up) C hubs are Tig welded 3mm S/S plate Steering is S/S tube leftover from the rear axle - machined out at each end to take a 626 bearing (x 4) King pins are M6 x 65 S/S cap screws I later made Alloy eccentric camber adj washers Steering had 3mm plate welded to the tubes (I had to do this LAST to get the Ackermann angle correct) the drop axle was bent by my mates at Qantas (it's not what you know, it's WHO you know![:D]) Maybe this helps P.S the drop axle is pinned with solid brass plugs wit M3 bolts keeping them in the front tubes[8D][8D]

bigmodman -> RE: Quarter Scale Dragster (5/2/2007 11:33 PM)
cool man thanks![:D]

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