The Fingertight Racing Sidecar Project

[Kickaha]

Yep fair call, same body work.

GRC one looks smaller to me although could just be the guys riding it are bigger

[Pumba]

GRC one looks smaller to me although could just be the guys riding it are bigger

No I am pretty sure it is at the very least the same RSR bodywork. Just camera angles and rider sizes playing tricks with the scale.

[Skunk]

Wasn't Speedpros chair a centre hub?


If it ain't smokin' - it's broken.

[Kickaha]

Wasn't Speedpros chair a centre hub?.

Pretty sure it was, rear engined and water cooled

[wildman]

Wasn't Speedpros chair a centre hub?


If it ain't smokin' - it's broken.

Yep still is, just got to stop killing engines in it. It's sitting in the naughty corner at the moment while i build up a new sidecar. Might bring it out again next year with a four stroke in it.

[Pumba]

Wasn't Speedpros chair a centre hub?

Yep



https://www.flickr.com/photos/sonscc...7642282552865/ - I can never figure out embedded images from outside sources

Pretty sure it was, rear engined and water cooled

Yep and yep

[Skunk]

Yep still is, just got to stop killing engines in it. It's sitting in the naughty corner at the moment while i build up a new sidecar. Might bring it out again next year with a four stroke in it.

If I had money I'd buy it (if it was for sale at the time). Always wanted that one...


If it ain't smokin' - it's broken.

[Gazzza]

Any one know when Chris and Richie are back? Would be good to see their rigs back at the track.

[wildman]

If I had money I'd buy it (if it was for sale at the time). Always wanted that one...


If it ain't smokin' - it's broken.

Was thinking about selling it as havn't had much luck with it. But decided i'd probably regret it, so have parked it up for now.

[jibberwobble]

I would agree with Pumba 50 psi seems a bit high. I know with my old gearbox kart running Dunlops or Bridgestones would run 15psi front and between 18-20 rear anything more and it would tend to make back end hop.
I think i got Brenton to run 15 psi in the front of his sidecar and 20 at rear but would have to check that with him. Over inflate a kart tyre and you loose grip real quickly , especially old compound ones.

Well it's only the chair wheel that gets that pressure and I think the name of the game on these little things IS to reduce grip on the chair wheel as it goes. It must just average out better to be faster on the straights and pay a small penalty somewhere else. Either way when ever we have an unexplained slow session it's generally because the chair wheel went a bit flat or we didnt check it. dropping to 20psi really does add over a second on our units.

As you say Kickaha at over 250kg's all up we are putting a lot more load on less tyre than a karter so running the same pressures as them isnt going to work out the same. Our tyres are proper puddings if we run them @15 and the brake disc sees as much tarmac as the tyre. with the minimoto's I just give em a poke with my finger but I find it a bit harder to tell on the 7-8 inch wide slicks. Our setups must work a little different, even with the rear at 30 it never hops or skips just spins up a bit sooner, nearer 25 is favored mostly on front n rear

[jibberwobble]

I forgot about that RSR rig, seen it ages ago on the Steve English sidecar site, sure it was a fair few grand which kinda makes it a non starter when you could buy a 2nd hand F2 for similar.

Yeah GRC one's got to be copied from the RSR one hasnt it, its so damn similar from the left but from the right it looks like a small land speed car with it's longer back end and the little wheel poking out the back.



Liking the back of the GRC better on the wheel cut out front



Now got a photo of the GRC naked but brace for disappointment..... it's only got a 40cc polini water cooled minimoto engine in it (around 9 - 10 hp 4.5ft/lb torque usually) so must struggle to even pull away. Those minimoto engines only have tiny little centrifugal clutch, on a 12+hp 50cc super (open class minimoto) that same clutch is fairly near the limit with one adult and a 25kg bike!!!

[Pumba]

Now got a photo of the GRC naked but brace for disappointment.....

Well if it is not a modified RSR then it is a copy as even with the limited photo angle the look very simular

[jibberwobble]

Yes agreed, it's remarkably similar in most respects. Must be scaled down a touch though.

[wildman]

Here's some photos of the hub steering bucket sidecar

[jibberwobble]

I like the centre hub steering. Great photos, can't fully work out how the steering works there though. The brakes are neatly tucked away in there ain't they!

It all looks quite strong though.