@titi97riti that would be the axle. In my case it's a round bar turned to precisely fit the inside of the bearings. At the front it's welded to the kingpins, at the rear bolted to the bracket that mounts to the trailing arms.
Are you going to race this cart? If so where, as like you we use motorbike wheels but the BMX wheel is faster off the line due to the weight of the wheel. I feel you may want to put brakes on the front as I have rear breaks only and will not be racing that way this year I am adding front breaks after an incident at the switch at Cairngorm soapbox extreme.
@roadrunner9115 Yes, I plan to do a run with the AIGRF soon (google it - they have some great videos!). Must admit I'm pretty nervous about how little brakes it has, though in testing I found I could stop quickly if I spun it! I'm hoping that the smooth steering and suspension will isolate me from the worst of what the road might throw at me.
thanks for the info and i see wt u meen im 17 and thought it was a good idea to rag a old pedal tractor down a hill and there on go kart stering and like u say verry twichy lol but god we had some fun that day
@hambon2k10 Because a simple Pitman Arm as used in karts has two problems - very limited movement and what movement there is is geared too high, making the vehicle very twitchy (which is OK for karts). For smooth and progressive steering with plenty of turn you need something linear like a rack and pinion but they are hard to make, so this does the same job but you can make it yourself for pennies.
@willespi frame dimensions are 1210 x 840 x 440mm to give wheelbase 1270, wheel track 940. With body it comes in at about 1m wide x 2m long x 0.5m high.
@patxidekds I don't know because most of the materials are recycled or surplus stock. Wheels were $17 each, tyres about $20 each which are the most expensive items we bought. The steel would be about $6 per metre if bought new. Ali sheet is about $80 a large sheet, but again this was obtained as surplus stock. The body is built mostly from plywood from a packing crate.
@SuperRazman123 Our wheels are 12" alloys from a scooter. We bought these direct from the chinese manufacturer, which took some working out about payment, but they were dirt cheap. But you could probably find them from a scrap (junk) yard. Turned out the stock wheels were not ideal as they were designed to mount between forks on a spindle, but we remachined them to bolt onto a custom-made hub/bearing unit.
Hi, I really like your go kart and the best part that I liked was the steering design and also I'm wondering why didn't you put an engine or a motor it would be more intresting to be driven.
@Martin18674 Well, you have to appreciate the amount of 'scope creep' there has been since we decided to build a gravity racer! We are now thinking it might end up with a motor, but it will require a bit of rework (like better brakes).
Hi, y have a gravity car of 3 weels, and l want to make one with 4 weels.
I want to know wat is the piece that tey links the weel with the chasis. Thankiou.
If I don't write well is because I'm spanish.sorry
titi97riti 3 weeks ago
@titi97riti that would be the axle. In my case it's a round bar turned to precisely fit the inside of the bearings. At the front it's welded to the kingpins, at the rear bolted to the bracket that mounts to the trailing arms.
GRAHAMAUS 3 weeks ago
When you do race with AIGRF, please be sure to get footage. Really keen to see you rolling.
TheSwingsloth 1 month ago
Excellent! But far away from the most seen "soapboxes", the frame works is airplane technology and the suspension high-end car technology!!!
ChrisLuxembourg 2 months ago
In the steering rack , put ! On the ropes is dangerous!
ivanovuman 2 months ago
nice
TheXxmultitaskerxX 3 months ago
Are you going to race this cart? If so where, as like you we use motorbike wheels but the BMX wheel is faster off the line due to the weight of the wheel. I feel you may want to put brakes on the front as I have rear breaks only and will not be racing that way this year I am adding front breaks after an incident at the switch at Cairngorm soapbox extreme.
roadrunner9115 3 months ago
@roadrunner9115 Yes, I plan to do a run with the AIGRF soon (google it - they have some great videos!). Must admit I'm pretty nervous about how little brakes it has, though in testing I found I could stop quickly if I spun it! I'm hoping that the smooth steering and suspension will isolate me from the worst of what the road might throw at me.
GRAHAMAUS 3 months ago
thanks for the info and i see wt u meen im 17 and thought it was a good idea to rag a old pedal tractor down a hill and there on go kart stering and like u say verry twichy lol but god we had some fun that day
hambon2k10 3 months ago
veey good but not sure about stering why not the old go kart style
hambon2k10 3 months ago
@hambon2k10 Because a simple Pitman Arm as used in karts has two problems - very limited movement and what movement there is is geared too high, making the vehicle very twitchy (which is OK for karts). For smooth and progressive steering with plenty of turn you need something linear like a rack and pinion but they are hard to make, so this does the same job but you can make it yourself for pennies.
GRAHAMAUS 3 months ago
Great job! What are the dimensions of the chassis frame L x W x H?
willespi 3 months ago
@willespi frame dimensions are 1210 x 840 x 440mm to give wheelbase 1270, wheel track 940. With body it comes in at about 1m wide x 2m long x 0.5m high.
GRAHAMAUS 3 months ago
how much for the car?
patxidekds 4 months ago
@patxidekds I don't know because most of the materials are recycled or surplus stock. Wheels were $17 each, tyres about $20 each which are the most expensive items we bought. The steel would be about $6 per metre if bought new. Ali sheet is about $80 a large sheet, but again this was obtained as surplus stock. The body is built mostly from plywood from a packing crate.
GRAHAMAUS 3 months ago
@GRAHAMAUS where is now the car?
patxidekds 3 months ago
nice job.
S1elmx 4 months ago
im thinking of doing my 8th grade project on gravity racing and was wondering what something like this would go for?
christof433 4 months ago
Very good this is fantastic but more gentle deve suspencion ok. Here are some tips.
Yes, do not be angry. Ok good bye
MrRusoo19 5 months ago
where can i get wheels?
SuperRazman123 6 months ago
@SuperRazman123 Our wheels are 12" alloys from a scooter. We bought these direct from the chinese manufacturer, which took some working out about payment, but they were dirt cheap. But you could probably find them from a scrap (junk) yard. Turned out the stock wheels were not ideal as they were designed to mount between forks on a spindle, but we remachined them to bolt onto a custom-made hub/bearing unit.
GRAHAMAUS 6 months ago
where can i get one of those seats???
sk8boyluis 6 months ago
@sk8boyluis I got that one off eBay, I believe it's from a standard racing go-kart.
GRAHAMAUS 6 months ago
That's a very nice piece of work...Thank your for sharing your experience!!!
FrankypankyV8 6 months ago
excellent job.
mr1000rx 8 months ago
estimated cost on this kart?
jzindeed13 8 months ago
Comment removed
Martin18674 10 months ago
@Martin18674 Tie rods were fabricated from scratch. They're just 13mm steel bar (RHS) with some threads welded into the ends.
GRAHAMAUS 10 months ago
Comment removed
Martin18674 10 months ago
@Martin18674 Tyres and wheels are (electric) scooter items.
GRAHAMAUS 10 months ago
Comment removed
Martin18674 10 months ago
@Martin18674 It's a normal go-kart steering wheel but I made up a centre boss for it which looks nicer and gave me some lathe practice :)
GRAHAMAUS 10 months ago
hey, it was good to watch your video from an engineering viewpoint but also...what's the song? it's good!
nwhm20 11 months ago
@nwhm20 First song is The Jezabels "Sahara Mahala" and the second is Goldfrapp "Clowns".
GRAHAMAUS 10 months ago
Comment removed
Martin18674 1 year ago
Hi, I really like your go kart and the best part that I liked was the steering design and also I'm wondering why didn't you put an engine or a motor it would be more intresting to be driven.
Martin18674 1 year ago
@Martin18674 Well, you have to appreciate the amount of 'scope creep' there has been since we decided to build a gravity racer! We are now thinking it might end up with a motor, but it will require a bit of rework (like better brakes).
GRAHAMAUS 1 year ago
Comment removed
Martin18674 1 year ago
Sweet ride, looking forward to seeing the finished project.
UKIGRF 1 year ago