I'm not a Fischer expert.In the mid 60's..sheesh ..can't remember this classic ski writers name??..he talked of skis coming with more radical shapes/sidecuts.I had a buddy big into Fischers..in the 70's..JK's etc.Can't remember exactlly when but Fischer brought out the C4's..late 70's?..these were legendary.I had a few pair too.HARD TOUGH STIFF skis..NOT! user friendly or for mortals.They were NOT nice to ski..BUT they sure did the job.What did come along with these monsters was the first brand that I am aware of that advertised the "cut" of their skis..as in sidecut.Hence they had some "Cut" series.HAHA..DON'T be fooled by this."Cut" ALL this meant was that SOME Olympians COULD NOW turn them.There was the "Cut 66"(66 mm waist)..Cut 70,Racing Cut,etc,These skis clearly had sidecut.At the end of this series came the "R" C4.I don't know what the "R" stood for.Perhaps "Racing Cut" The "Vacuum/Technic" series was a manufacturing process..in the wrapping of the wood core in glass.To me..this RC4 was just not the same ski,Sure they were CIVILISED..COMPARED to the early ones..BUT seemed to lose their Ba**s.I have an old classic pair of RC4's.
The other "S" designation I THINK came out before din standardization to denote "skier type".I remember first seeing it on early binding adjustment instructions.AND later on some skis.Sometimes as part of the model #.
Fischer used SL for Slalom..and did use "S" for skier type.As well as RS..AND "Super"..I can't offhand remember what the RS stood for..I believe it WAS explained to me and is here in the archives.Under a thread about whether some Fischers I have are "Super G" skis..
The C4 SL's were strong skis that could and maybe liked to be man-handled..I don't think they could be "over skiied" TOO aggresively.They were blazing quick edge to edge for old school feet glued together technique.Respectfuly another classic old pair of K2 710 Comp.SLs I have would give up some sheer strength/stability of the Fischers..for an even quicker reacting ski..although a little less solid feeling.
If you're into that kind of ski..or style like the Fischer..they almost had an aggression/arrogance about them..I have a pair of Kastle Speed series..about 102tip /62waist .These are an ARROGANT/abrasive,stiff, lots of camber ,nasty ski in a 190..VERY "in your face" ski.These seem to like that kind of aggression in the skier.They will "get down" old school if you want.And litterally HUMILIATE the Fischers..AND your thighs.You too if you make a mistake.Hair triggered,explosive,0 forgiveness.They will also howl and carve..but are WAY too high energy required/burn the thighs.LOL..I go from these to my Dynastar race stock gs skis..and the Dynastars feel like skis for someone old(respectfully) and in a rocking chair.The Dynastars don't like being skied rough..NOT! that they're wimpy..just they don't like it/don't respond well to it..but they'll do everything and more that the Fischers will do with ZERO effort in comparison..and silky smooth.beautiful dampning!
I haven't had my RC4 Vacuum Technic out for 2 years now..even for a spin..should think about getting rid of those too.