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Post by Scottish Cartie Association on Jul 7, 2011 16:26:13 GMT
Go cart style steering would be the way to go. Make sure you put the seat as low down as possible or you'll be rolling it. Also - stock mtb wheels might not take the side loads very well and will probably go pringle shaped quite quickly, especially if the course is rough too.
The Cheats used to run a "two mtb" type cartie. After the first year, when they folded the wheels, they did some serious surgery to it and fitted 20" wheels. It might have been easier just to start with two BMXs.
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Post by grahamk on Jul 7, 2011 19:23:31 GMT
my info pack came today and i have filled it in and put in the post Next weekend i might start a build
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Post by gunnerhoots on Jul 7, 2011 21:06:42 GMT
I take your point about the larger wheels not taking the load ,but having trouble getting BMXs without spending sums of cash. I dont expect this buggy to last long, Its only got to do 3 fairly short runs (albeit fairly rough ones), and then home for a service.So I m going light, lean and mean and hope for the best.
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Post by neils on Jul 8, 2011 12:42:21 GMT
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Post by peasnbarley on Jul 8, 2011 15:55:22 GMT
Gulp! Quite a drop off if you lost the sheep track.
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Post by stevec12 on Jul 8, 2011 17:20:02 GMT
now id have a go at that !!! put some knobbly tyres on c12 and i think that would be fun
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Post by leew on Jul 8, 2011 21:11:52 GMT
er, I can see two problems, one is that knobbly tyres in the 349 size seem none-existant, and also I don't think you have enough ground clearence, you would possibly ground it and get stuck.
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Post by stevec12 on Jul 8, 2011 22:20:10 GMT
ahhh yes good point ill have to put my old 304 wheels on and invert the uprights to get the ground clearence
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Post by grahamk on Jul 13, 2011 20:23:35 GMT
Well i have just received a mini quad motorbike This weekend i will start hacking it to pieces to make my Screwfix cartie. ;D
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Post by grahamk on Jul 16, 2011 22:22:52 GMT
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Post by peasnbarley on Jul 23, 2011 15:52:09 GMT
I have got my letter from ScrewFix confirming I have a secured place in the Surf and Turf heat on the 3rd September 2011. have got to be at Raines Hall farm, Sedgwick Cumbria at 10:30am. Safety inspection and a trial run to test the cart out before the real thing. ;D
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Post by gunnerhoots on Jul 23, 2011 16:11:40 GMT
I too am a lucky winner of a place in the comp. Build is complete and road tested. Its a bit of a dog but it goes like the clappers in a straight line !. Brakes need a bit a bit of attention (had to use the long grass to stop) but nothing that can,t be sorted. Anyone else out there entering the Chester/Wrexham heat ?.
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Post by stevec12 on Jul 23, 2011 19:42:34 GMT
Recived my letter comfirming my place at the gloucester heat ive only lot 2 weeks to get the knobbly tyres fitted and the ground clearance sorted good luck to all
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Post by Scottish Cartie Association on Jul 23, 2011 20:36:09 GMT
I've just ordered my knobblies. I estimate it'll take me approximately 30 minutes to get the Bandit ready.
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Post by leew on Jul 23, 2011 21:48:47 GMT
Recived my letter comfirming my place at the gloucester heat ive only lot 2 weeks to get the knobbly tyres fitted and the ground clearance sorted good luck to all It maybe a good idea to install 406 wheels as you can get a good range of knobblies in that size and the extra size should give you the requisite ground clearance.
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Post by neils on Jul 24, 2011 9:13:36 GMT
Graham, this looks sooo good, anyone up for a few races like this for next year, would have all winter to build a suitable cart for serious rough stuff.
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Post by grahamk on Jul 24, 2011 11:03:34 GMT
I think it has potential See what happens at the Screwfix event, and i see no reason why other events can't take place next year. For me it would be better as i have been into this type of thing for over 30 years. I also have contacts at major downhill race events and i could see if we could run these alongside some of of the Scottish Downhill Mountain bike championships, or in with some dual slalom racing. It all depends on how many people would be interested in building one of these carties. Watch this space. Here are a few ideas on the perfect set-up. Camber is usually between 1 and 2 degrees depending on the track surface and traction available, 1.5 degrees is always a good place to start with. If the cartie traction rolls, add more, if it washes out easily take-out a little. By the way, I am referring to negative camber, or tires leaning in at the top, never use positive camber. Ride height i would set it so the cartie is almost always set with arms level. When it comes to camber link mounting points, think in terms of camberlink length. Longer is stable, shorter is quick and snappy. Camberlink angle is generally not messed with much in off-road, usually you set your arms pretty flat and leave it that way. Caster is the angle of the king pin of the front wheel, or more accurately, the angle on which the steering hub turns. It’s always negative in off-road racing. It is used to tune weight transfer in the corners, the more caster you have, the more weight gets pushed to the inside rear tire in the middle of the corner. Toe-in or more accurately toe-out is used in off-road racing to effect steering and stabilize the cartie. Most carties will run great with 0.5 to 1 degree of toe-out, use more for more sketchy tracks, use less or zero for smooth, fast tracks. Kick-up is the angle formed into the chassis to help the cartie land without digging in, it is also the angle at which the front lower hinge pins sit when looking from the side of the cartie. Think of this angle as if it were the nose of a sled. The higher the nose of the sled sits, the easier it will climb over bumps. Similarly, front kick-up, or anti-dive as it is called in off-road Racing, will help to a certain extent handling on rough tracks, but too much can make the front-end too soft on big jumps. Kick-up also helps control chassis attitude when on the move, and when braking, more kick-up will reduce diving in corners under heavy braking. This gets real complicated, then tune the suspension once you are sure you have the right tires and good steering. Anti-squat is the same thing, but in the rear. This is used to either limit or increase rear weight transfer when landing etc. Hope I didn't confuse you. ;D
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Post by peasnbarley on Jul 24, 2011 12:51:04 GMT
Well that all sounds great and I am sure when it comes down to actually building an off road cartie there will be a lot of head scratching and some difficulty getting away from the mind set required to build a fast on road racer as I am sure the two disciplines throw up different problems. I can sledge the front of my cart without too much difficulty but raising the ground clearance is going to result in a lot of toe-in and there is not going to be enough adjustment to correct it without altering the wishbone mountings which is a lot of faff. If there are going to be jumps the seating will need changing which means the roll bar/cage has to be adapted to give clearance. Water splashes, jumps, slippy grass and the like are all likely to produce loads of fun and laughs which is exactly what I think we are looking for. Our adapted road carts are probably not going to stand a chance but who cares if the group that turn up are out to enjoy themselves.
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Post by grahamk on Jul 24, 2011 12:56:33 GMT
Water splashes, jumps, slippy grass and the like are all likely to produce loads of fun and laughs which is exactly what I think we are looking for. Couldn't agree more. ;D
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Post by gunnerhoots on Jul 24, 2011 18:08:01 GMT
Damn... I don,t know what to build next now. Id kind of decided on my next build of a roadster speedster along existing lines but now I just dont know. The thing I ve built for Screwfix is along the lines that four cross (its got four wheels with two smaller ones at the front but thats it). Am I going to have to have 3 carties in my garage ?. They seem awful technical to build as confirmed by Grahams post but I d love to see some racing like that over here , as long as it can be kept low budget and home made , the one in the clip looked factory built and would be beyond the skills/tool availability of a lot of soapboxers.
Water splashes, jumps, slippy grass and the like are all likely to produce loads of fun and laughs which is exactly what I think we are looking for. Yes!!
but who cares if the group that turn up are out to enjoy themselves. and yes!!
I m sure you guys will work something out ..looking forward to it
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