Ducati Cucciolo

[rustybronco]

http://docs.engineeringtoolbox.com/documents/1632/hydrostatic_pressure_water.png

 

[tatu]

Tatu, he's talking about 'hydrostatic pressure', not the weight of the fluid.

http://www.thefreedictionary.com/hydrostatic+pressure

The pressure exerted by a fluid at equilibrium at a given point within the fluid, due to the force of gravity. Hydrostatic pressure increases in proportion to depth measured from the surface because of the increasing weight of fluid exerting downward force from above.


This refers to depth, which I can easily understand and it means the weight of fluid is bearing on a given point within the fluid, meaning that at the surface of the fuel in the tank does not have weight of fuel as it does at the bottom of the tank which is under hydrostatic pressure and therefor more dense. This is what divers have to concern themselves with.
However, this will not apply in this case because the tank holds what it holds and it will not change. The pressure at the end of the fuel tap pipe will be the same at pretty much any height within reason. if the fuel weighs a pound by your foot it will still weigh a pound by your head, the pressure at the pipe will not increase. The amount of pressure at the end of the pipe will be equal to the weigt if fuel in the tank.
Here's one for you, the fuel in your aircraft tank doesn't get heavier the higher you go.

 

[rustybronco]

Here's one for you, the fuel in your aircraft tank doesn't get heavier the higher you go.

Correct.

But if you were to connect a tube from the fuel tank and run it down to the earth, the pressure exerted at the end of the tube would be greater than the pressure at the bottom of the fuel tank; which is concern for the mounting height of the fuel tank.

 

[Guest]

Thanks Tatu, and yes I've heard of the Cyclemaster, a different way to address the same need I think when cheap transport was required after the war.

Something tells me this won't be practical every day transport once it's finished though

And you were the lucky one, having an engine over having the "cool" new bikes

I was thinking more of Newton's law, was sure I remembered something where the force of gravity increases with distance from the ground... although of course it's been quite a while since I learnt Newton's law so could be completely out of the ball park on that one

I'm sure I recall knowledgeable people on here suggesting not to mount temporary fuel tanks too much higher than the normal fuel tank so it doesn't force the float valve to open incorrectly... again I could be wrong...

At the end of the day I think it just looks better down lower too

 

[Guest]

Correct.

But if you were to connect a tube from the fuel tank and run it down to the earth, the pressure exerted at the end of the tube would be greater than the pressure at the bottom of the fuel tank; which is concern for the mounting height of the fuel tank.

Aaaaah of course! Newton's law of relativity right? Something like that? All this thinking is making my head hurt now...

 

[tatu]

Correct.

But if you were to connect a tube from the fuel tank and run it down to the earth, the pressure exerted at the end of the tube would be greater than the pressure at the bottom of the fuel tank; which is concern for the mounting height of the fuel tank.

Well now, that would depend on the diameter of the pipe and its potential volume.
Essentially it will remain unchanged as we are back to talking the mass of the fuel and not the hydrostatic pressure.
It will not matter if the tank is 6" off the ground or 6' as far as the pressure at the end of the pipe is concerned as the only difference will be the mass within the tube, and this in this case is insignificant.

 

[tatu]

Aaaaah of course! Newton's law of relativity right? Something like that? All this thinking is making my head hurt now...

Aye Pete, you're getting it now, Einstiens law of gravity too.

 

[Guest]

Aye Pete, you're getting it now, Einstiens law of gravity too.

Hahahaha yeah that's the one! Told you I could be wrong

I'm sure I can think of some other law of physics to mangle to "prove" some other thing at some point... hahahaha

 

[tatu]

I'm sure I recall knowledgeable people on here suggesting not to mount temporary fuel tanks too much higher than the normal fuel tank so it doesn't force the float valve to open incorrectly... again I could be wrong...

At the end of the day I think it just looks better down lower too

Nah mate, they're all wrong.
And it does look better lower, when I bought my second Cyclemaster the gug had a manky set of forks for a bike that were meant for the cyclemaster setup, they looked a bit like girder forks and he wanted ?300 for them!!
I remember reading an article on line about a fella that rode around Aus on a bike powerd by two Cyclemasters many years ago. One in the front one up back.

 

[Guest]

Nah mate, they're all wrong.
And it does look better lower, when I bought my second Cyclemaster the gug had a manky set of forks for a bike that were meant for the cyclemaster setup, they looked a bit like girder forks and he wanted ?300 for them!!
I remember reading an article on line about a fella that rode around Aus on a bike powerd by two Cyclemasters many years ago. One in the front one up back.

300 pounds! Ok that's a little over the top...

I know it was common back then to put girder or similar style suspension up front and use a sprung seat to soften the rear, so I'm hoping if I'm patient I can get a set without blowing my non-existant budget...

I'll have to search for that article! Sounds interesting... if a little mad...

 

[rustybronco]

Well now, that would depend on the diameter of the pipe and its potential volume.
Essentially it will remain unchanged as we are back to talking the mass of the fuel and not the hydrostatic pressure.
It will not matter if the tank is 6" off the ground or 6' as far as the pressure at the end of the pipe is concerned as the only difference will be the mass within the tube, and this in this case is insignificant.

Tatu, I have re-read the subject matter and you are entirely correct. My apologies to you sir.

 

[tatu]

Tatu, I have re-read the subject matter and you are entirely correct. My apologies to you sir.

Hey, no worries, I know what its like to have this sort of itch in your head and it just won't go away. till its completely scratched.

Back to Pete's rebuild. sorry

 

[Guest]

Thanks for the education guys! See I was working under false pretenses there too... we all learn something new every day right?

And back to on topic... in the off topic forum... hahaha

I joined a bicycle forum in the hopes of getting some more correct identification of the frame as that's where all my Google searches led me.

So far one says 1930's and one says 1950's... in the ball park I guess...

 

[Guest]

My house mate arrived back home with a present for me this morning:

He spends a few nights at his mum's each week (she's 98 and a little wobbly on her feet) and her next door neighbour is very handy. He just happened to have a press in his back yard that popped the sprocket and bearings off the crank shaft very easily. Awesome! A six pack will be paid in due course

Once I find replacement bearings he can press them back on again too which will save me a rather large headache.

I cleaned up the pedal crank and bearings from the Malvern Star tonight:

Everything cleaned up nicely and that now means that both side pedal crank bearings are good to go and don't need replacing. Finally a win!

Then I pulled the rest of the random bits and pieces out of the crate to check them a little more closely.

Four control cable innards that look pretty useless:

Registration label holder, some brackets, and what appears to be brake lines from a car:

But wait, is that some printing or something in the registration label holder?

Well there ya go! Latest registration expired November 1953:

Never seen a label from back then before and it's held up pretty well:

The label holder cleaned up pretty well too:

And last for the night I had another gentle go at getting the float valve filter off and succeeded finally:

It ought to clean up with some carby cleaner.

I think I've pretty much reached the point where I can't do any more until I can get some proper cleaning/degreasing done of the cases and sort out how I'm going to try the walnut shell blasting.

The next two weekends are booked solid with other stuff and there's no available cash until next pay, so I can't see me getting any more done for a bit, although I can start trying to locate some parts such as the new crankshaft bearings and trying to source an ignition coil.

I need other things like forks, brakes, wheels etc. too but the motor is the most important bit for the time being.

 

[Charlie G]

That registration is precious! Did that come with the bicycle?

cg

 

[Guest]

That registration is precious! Did that come with the bicycle?

cg

It sure is Charlie! I'll have to preserve that and put it back in the holder I reckon after I give the holder a good spruce up.

It came in the crate with the motor...

 

[Charlie G]

I would think the registration would some value all by itself. Now you need some vintage clothing to go with it. You could be the first "Cafe Racer", terrorizing the citizens of Queensland by doing the Quarter ton through town on Sunday. It's going to be a "Sick Puppy" when your done. That's a good thing, ya know.

cg

 

[razor02097]

Hell yeah

That registration tag is a cherry on top. You cant beat authenticity! The end result is going to be one of a kind for sure

 

[Guest]

I would think the registration would some value all by itself. Now you need some vintage clothing to go with it. You could be the first "Cafe Racer", terrorizing the citizens of Queensland by doing the Quarter ton through town on Sunday. It's going to be a "Sick Puppy" when your done. That's a good thing, ya know.

cg

Hahahahaa now should I go the puddin' bowl helmet or the leather skull cap? Choices, choices!

Hell yeah

That registration tag is a cherry on top. You cant beat authenticity! The end result is going to be one of a kind for sure

Indeed! It may not be one of a kind (there's a few out there) but it will certainly be somewhat of a rarity if I can pull it off...

 

[Guest]

I got another reply on the bicycle forum from a guy who apparently has collected a large number of serial numbers to try to make sense of the series' and ages.

He approximates this frame at 1939...