Hi gtsun,
Yes, you are correct, the manx did evolve from the international, however they only shared the mechanical components (and maybe the front forks?). The featherbed frame was first on fitted to the racers and then later adapted to the Norton street bikes. All the featherbed framed models (ES2, Dommi, Manx etc.) have swing arms, the previous lugged frame was known as the "garden gate"
There's more info here on wiki http://en.wikipedia.org/wiki/Featherbed_frame

I hope this answers your questions

Webby

In the featherbed years, it might be more accurate to say that the Inter was eventually produced as a much lesser version of the Manx. ?

Since the Manx by then was a cobby little race bike, dohc donk with 531 tubing frame and all magnesium castings and forged-alloy parts. And the Inter was none of that....

P.S. While they look like they may share stuff, there are no parts actually shared by featherbed manxes and inters - except perhaps the Norton decals and the air in the tyres... ?

Well they do share a couple things like my severe desire to own one or the other, or both & they also both share a price range way out of my budget!

Well, if you'd noticed that cammy motor in the back of the 47 ES2 sale listed in another thread here, it already went for $2500. While not original, when that motor is slotted into a Norton somewhere, it will make a budget cammy Norton.? Quite a few such bikes you see for sale are often just such cobbled up bikes, although the spiel might lead you to think otherwise. More so in the UK than the US, it must be said.

Manxes might be a little tougher to do a budget version though. Perfect genuine bikes are always in collector territory though - even when brand new a Manx cost more than a house to buy at the time.

We diverge, nothing to do with slimlines here...

Cheers.

P.S. When Manxes and G50s were popular in Japan recently, there was a vast array of stuff to build your SR500 or XT500 etc into a Manx replica or G50 lookalike. Even bolt-on bevel housings and gold cam chain covers, along with clip-ons, race seats, race exhausts, and a range of lookalike manx and G50 tanks etc. Some of these big trail bike singles or KTMs or Rotaxes would have performance not unlike a Manx or G50, when you think about it....

But maybe we don't talk about that here ?

Tecnically a Dual Loop frame , rectangular . commonly called duplex loop .( F750 Triumph is Dual Loop triangular )

MANX is a Grand Prix raceing machine.

International is a Sporting Road machine.

500 T was Trils . Alumnium ES2 motor .
The mothers brother was in the army, a
D.R. rider had one of these , pinched a
Gilera in the Desert War ( the 1940s one !)
as it was lighter and better in the sand .
Invalided out as Cannon shell hit forks
from Messerschmidt .

Bit like S & SS Ducatis 70s, variants .Though Manx was never intended for street use.