Ive Got A Big Shaft

[D.I.Y. Mik]

Ha ha.. now i have your attention..

I now have a single piece tailshaft cos the old one died.

The original is two piece and i was wondering why?

It would cost more to make for Nissan so there must be a good reason for doing it.

Is there any disadvantage to having a 1 piece?

And yes its a big fat shaft with V8 unis.

[zebra]

2 pieces usually have less vibration and can be quieter due to the centre bearing

[The Dan]

It's simple....and has been answered many times before....a two piece shaft is stronger, less likely to buckle or bend in the centre due to it reaching critical speeds.

A one piece tail shaft of 50inches made from a tubular 3 inch x 3mm wall steel will go critical at approx 6500rpm or so. They can last a while without bending and the strong ones last the longest but the higher speed it rotates, the more chance it will have of buckling.

Two piece tail shafts have a bearing in the centre which means each part of the shaft can see well over 15,000rpm before bending.

I've binned more one piece tail shafts than I even care to remember. Unless they are made from aircraft alloy, are very thick or are made from carbon, they are rubbish.....I don't care how big the unis are

[warps]

Exactly as Elite Racing said. It's all to do with natural (harmonic) frequency. The longer the shaft, the lower the harmonic frequency (which will happen to correspond with the RPM it will see on the road / track). Ford used to speed limit the Falcons to 180 because of the long tailshaft.

[D.I.Y. Mik]

So top speed is limited.

Fast enough for a street car surely?

Its not like id want to go 180 down a country road, i used to ride sportbikes, so im over it.

If i want to put it on the track oneday, it would be Wakefield, i dont think it would get a high speed there.(rb20det)

Anyway thanks guys.

[Birds]

Huh? He clearly said RPM is limited...

[GTSBoy]

It's a tailshaft. rpm and top speed are the same thing.

[The Dan]

Yeah I'm talking about shaft speed in RPM.

Tailshaft speed is only ever faster when wheel speed is faster as gearbox gearing is a reduction from engine speed

[Nee-san]

I wonder how using a non circular sectioned material would go ?

should run some calcs on triangular section LOL

[D.I.Y. Mik]

Obvious.. tubes are stronger. Basic physics.

Try laminating a tube with a different material so you get a matrix.

You know.... one material for stiffness, and one for handling the torque. Like a helicopter blade.

I bet F1 has this, probably since the 70's or 80's.

[GTSBoy]

I bet F1 hasn't used tailshafts since the 60s.

[Nee-san]

I bet F1 hasn't used tailshafts since the 60s.

LOLOLOLOLOLOL