Originally Posted by kb525
Ive been thinking about this for a bit, would there be any advantage to runing IRS front suspension on an F104w? Im thinking of trying this out whenever i get mine shipped over here. Pretty much consisting of the linked front suspension with the bottom plate converted to individual links, then a small spring connected to the main section. And possibly a tube damper connecting both sides.
The original Cross F1 from 7-8 years ago had a proper inboard springs and rockers front end, you can see it here http://www.rc-cross.com/page/FireForce.html
and it had a link rear end. In 2008 it was redesigned, keeping the double wishbone front end but moving the springs outboard to cut down on the complexity, and the link rear end was ditched for a normal T-piece rear, details of it here http://www.rc-cross.com/page/english/FireForce2008.html
. If you fancy using it, RCMart are selling the Fireforce for less than half price
As Robks pictures show, proper independent suspension was tried in 1/12th and 1/10th 20-30 years ago and abandoned as with all the extra complexity and weight didn't improve performance one bit.
A double wishbone suspension only has an advantage over a greater range of suspension travel than the sliding kingpin/single wishbone/fixed lower wishbone designs that are used currently. The latest Yokomo R12
uses a double wishbone front end which can fit any other 1/12th yet no one is swapping from the current Associated front end.
I have an HPI Super F1 and also have the HPI front end on a Yeah Racing Dark Chocolate conversion
to match the extra rear end movement. In both cases due to the very inboard spring mounting, in both cases I have replaced the springs with two O-rings each side to limit the wheel movement and also damp the springing.
If you want to develop a double wishbone front end then I would recommend you try and have the spring mounting point as far out on the wishbone as you can, much like the Cross front end. Scaling from your drawing it looks like a 9:1 leverage ratio, which means the springs will need to be 9 times as stiff as normal springs, and over full travel the spring will be compressed by 0.5mm to 1mm only.
As for IRS car being the future of F1, well currently they are only race legal at UF1, most other places around the world lists a solid rear axle in the rules. I know in the UK the decision to allow IRS would have to be voted in by the BRCA members which is very unlikely to happen. It will also be interesting to see if IRS can run at the IIC, considering last year they ran spec tyres obviously chosen for pan car chassis rather than being suitable for the FGX.