The Place

call it pipe to avoid confusion

At this point I would like to hide behind the CRMC rule on frames which states "frames are to be of a tubular construction" as pointed out by my predecessor a few posts earlier. Personally I love to see different ideas out there - to have been around in the Classic '60s era when people had the freedom to try out all sorts of wacky ideas must have been fantastic. But sadly that was then and this is now and if we allow tin chassis in the next step would be a monocoque chassis made of aluminium and we end up with F1 - which is what happened at the time.

So, although it irks me somewhat, because I personally love to see different stuff, I feel as Eligibility Officer we must stick to our good old Reynolds or T45.

If somebody knows where Herr Kruth's original outfit is then get it back on the track.

Ian

P.S. Just a thought - if somebody did present Mr Kruth's outfit, refurbished, sparkling clean, how would I know whether it was the original or a replica? Ooops!!!!

Out of curriousity,what advantage,(if any) has a box/fabricated beam,compared to a tubular cross beam?

Tony asks what advantage with a "tin chassis".

The easiest way for me to explain is this: 1967, Mallory Park, practice, Gerrards - standard ware was lore or less Brit twin, 16" F&R or possibly 19" rear, little black outfit slides round our outside (the hard way IIRC!) with passenger crouching by back wheel, hand draped over the rear wheel arch - disappeared into the distance. That was Rudi's mini wheeled black Bomber outfit, seemed to outhandle just about everything.

Me? I don't need any more proof

" Frames to be of tubular contruction" .So does that rule out fabricated sections from bike to sidecar

ERRRRRRRRRRRRR............Damn it..I'll be back....

Hi Mike,it would seem everybody seems to think your asking about fabricated frames,when I thought you were asking about the beam that runs across the sidecar which holds the swingingarm mounts and the sidecar axle.I.e only one part of a frame,not the whole chassis.Am I correct?

In reply to ynys-mon,I made 2 swing arms, one for a friend and one for our bike from 2"x1"box.1 bike gained eligibility, the other one failed they were both made from the same length of tube, and we had to make another, we made this one from oval tube and this was deemed ok,the same eligibility man made the distinction between tubes saying that box section was not tube!!!!,please don't ask me as i had no explanation given to me.

ynys-mon wrote:Isnt "square tube" Called box section

no its called square rhs tube

`Herr Kruth` Ian?? Who`s he then?!!

Hi Tony yes I was asking about a full fabricated chassis, but I also need to know about fabricated Beam, spar (whatever you want to call it ) I have built stuff in F2 then its been rejected I dont want it to happen again Its like the Rudi Kurth bike and others it happened but your not allowed to replicate it, which is probably a good thing

johnc wrote:`Herr Kruth` Ian?? Who`s he then?!!

Basically I have no idea except he sounded German hence the "Herr" and apparently he had a tin chassis which Mike Richards is discussing.

RHS Tube, Rectangular Hollow Section, available in the 1960,s

Bike in pic built in 69-70 forks and s/arm made from rectangular tube by M L Harris (on bike). Also the disc's are floating and susp is by rubber band like fork's on speedway bikes

pictures of Rudi Kurth's 1967 Honda CB450 outfit can be found here:

http://forums.autosport.com/index.php?showtopic=109582