Which would go along with the below quote, although looking at the pic it looks like the whole front is twisting sidewaysOriginally Posted by Drew
In the riders seat
Which would go along with the below quote, although looking at the pic it looks like the whole front is twisting sideways
"If you can make black marks on a straight from the time you turn out of a corner until the braking point of the next turn, then you have enough power."
Ta
It would have to have so much castor to get the angle seen in the pics, that you couldn't turn the bars without doing six months of arm work at the gym. So I think your second quote refers to a different bike or set up. Lots of castor gives heavy steering, not light/twitchy.
Pretty sure the front end is flexing. How the gantry is mounted is not clear in the pic though, so no idea where it's happening.
In the riders seat
I don't believe the castor it is running has much to do with the camber angle it is getting as the wheel still looks to be at 90 degree to the front suspension arms, I notice it doesn't have the vertical bar on the front cross link that we run, when Dave fitted it he said it made the front feel more rigid
"If you can make black marks on a straight from the time you turn out of a corner until the braking point of the next turn, then you have enough power."
Hardcore Biker
From a quick 'nudge it with the knee' test at the track, it is definitely flexing. It would also explain the flicking to one side problem mentioned.
The wheel, when turned creates a friction force that is 90 degrees to the tyre. Because the wheel is not pointed straight ahead, some of this acts longitudinally. When the contact patch deviates away from the king pin axis along with this longitudinal force. You are left with a force and a lever arm, which creates a torque, that wants to turn the bars in the direction you are already trying to push them. The system is now unstable and so wants to pull the whole way to 90 degrees steering angle.
Weekend cruiser
Hmmmm Rick taking a second off the lap record either way will take some doing, but could it be we are headed for the first sub 34 second sidecar lap. I'm not sure what we have up our sleeves re getting quicker times, I was tinkering with a leading link front end but it started to weigh in pretty heavy and I wasn't too sure it would have any benifit, I think just working out the best combination of riding and swinging is our best bet to lop off a bit of time.
I have a question that maybe Drew or Kichaha may have some ideas on... Say I was looking at a new build but was say limited to engine (my Loncin 150) and a hub front end was just a wee bit beyond my engineering what would you think would be the best sort of approach to take. Would you go kart rims and tires or 10 inch rims, conventional front end or maybe leading link? The other thing is short or long rig, bearing in mind Mt Wellington would be the track it spends most of its time, any ideas/advice much appreciated.
Race it don't store it !
Kart wheels are the way forward and sub 34sec is on the cards, the front end is not twitchy or hard to turn, the under steer problem was the chair wheel toeing out 10mm over 1200mm and being way to far forward, the driveway test feels much better already, having the wide slick on the back will push the front again so we need a new front tyre to cope.
Moools knee test did reveal a little more stiffness is needed in the front end but if it steers rather than scrubbing it might not be needed !
In the riders seat
Haven't ever had anything to do with Bucket sidecars, but I'd be using Kart wheels and wouldn't bother with suspension on the rear anyway, undecided if I would on the front but would probably do leading link for ease of manufacture if I did and front engine
Most of how fast an outfit goes just comes down to the crew riding it
"If you can make black marks on a straight from the time you turn out of a corner until the braking point of the next turn, then you have enough power."
Who You Calling a Pig
So I have been thinking about this for a little while. My chair insist getting any use and it might still be a bit before I do get to use t on a consistent basis and I know you guys are struggling for numbers in Auckland. So is there anyone out there that want to buy my rig?
Comes less an engine, but is plumbed and ready for an FXR. The front end has been tacked back on, but still requires dome reinforcement.
Just an idea if anyone is interested let me know.
Oh and on another note, picked these up the other day
For the record Qkkid was in my bed, not the other way round
Hardcore Biker
how much i know someone who may buy it
Who You Calling a Pig
Hey Chris, Warren sent me a PM first so we will see how that goes. I was thinking around the $300 mark price wise.
Hardcore Biker
Okay so after watching the bucket sidecars running at Mt Welly on saturday and chatting with people it looks like the Battle Truck will be back in action for the GP in March. new old front end is back on and chassis is under going some weight reduction [ nearly as heavy as the Agip bike ] will post some pictures in a week or so when chassis is finished. And it looks like Pumba is going to have another go at taking out the GP on it so watch out Rich and Henk
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