Cruser meets Van

[ital916]

Err yes some of them do - and it's with them that your generally manage to attain your top speeds.

And for the record, I'm not a physicist, I'm not a engineer, but I am a sailor.

A sailor that is drunk most of the time he is on a ship

The fastest speeds obtained by a sail boat will be when the sails and keel are used in equilibrium. the aerodynamic and hydrodynamic forces will always be in a state of equilibrium. When not is when things go wrong. Think of the keel as an underwater wing, simplifies things greatly.

State a situation where using a sail in a wind catching manner will attain a higher top speed that using the sail as an airfoil. I for one have never come accross it, tis why sail boats travel in a zig zag pattern downwind. I should post a picture of a speed polar I computed for an experimental german yacht at uni, then you will see what I am harping on about. Then I am happy to be corrected as I am always learning.

[ital916]

But - von Klunken has about the largest , most slab sided fairing ever on a motorbike. Yet, it's the most wind stable bike I've ever owned. How come?

Whereas ffwabbitt with no fairing at all is quite bad . maybe not the worst I've ever ridden but up there.

It's more complex than just the area of the fairing.



Not really. A sail relies on having higher pressure on one side than the other. Is there any evidence that a motorcycle fairing, side on , has a pressure differential.

Like I said in a previous post, most of the time you cant knock things down to simple fundamentals. There are more factors than just area, for example height of the motorcycle, difference in mass etc.

Motorcycle fairings do have pressure differentials but at extreme situations. I remember studying a paper about the downforce created by motorcycle fairings in high speed and high lean corners. Quite interesting, but 99% of the time fairings do not act as sails, and REMEMBER sails are the same as wings, or better termed airfoils.

Is it just me or am I repeating myself.

[ital916]

However, if the fairing is curved, then the wind is merely diverted, and the force that it applied is proportional instead to the diversion of the wind, which will be less than the full force. The more the wind is diverted the more 'pushing over' force you will end up having.

That is wrong, but I am tired of writing HUGE posts, so ill just leave it as that is wrong. I thought you studied electrical, I would stick to that.

[ital916]

How did a

"i crashed my bike"

thread turn into a

"i am the better lecturers pet"

thread?

We can turn it into a " I am the better Work and Income New Zealand Pet" just for you shitstain

[Danae]

Guys, you're making my head hurt! I mean, physics is great but you can have too much of a good thing. I don't go on KB to learn stuff, I go on KB to avoid learning stuff!

[PirateJafa]

A sailor that is drunk most of the time he is on a ship

The fastest speeds obtained by a sail boat will be when the sails and keel are used in equilibrium. the aerodynamic and hydrodynamic forces will always be in a state of equilibrium. When not is when things go wrong. Think of the keel as an underwater wing, simplifies things greatly.

State a situation where using a sail in a wind catching manner will attain a higher top speed that using the sail as an airfoil. I for one have never come accross it, tis why sail boats travel in a zig zag pattern downwind. I should post a picture of a speed polar I computed for an experimental german yacht at uni, then you will see what I am harping on about. Then I am happy to be corrected as I am always learning.

Some yachts will sail a zigzag course downwind depending on what sail(s) they are carrying - IE a yacht flying an asymmetric spinnaker will sail a series of downwind reaches, whilst the far more commonly used symmetric spinnakers you point straight downwind and crack open the gin and tonic.

You can come racing with us some time if you're man enough.

[motorbyclist]

I gave up as soon as i saw realwolf's massive post


dushy clearly missed my point, is trolling hard, and is jealous he can't do mechatronics (btw, the idea is not to replace a mechanical and electrical engineer, but to oversee the mechanical, electrical and software guys. NEWSFLASH; companies worldwide finding that mechatronics engineers ARE infact preferable to two individual specialists who can't understand each other )

+1 for jafa's post with pictures

[Danae]

I think I should get bonus points for not taking any of this seriously, posting a joke my friend told me, and posting an awesome picture

[skidMark]

Jesus christ it keeps getting worse



Ladies and gentemen i present... the future of New Zealand.

Oh we are fucked.

[Ixion]

.. NEWSFLASH; companies worldwide finding that mechatronics engineers ARE infact preferable to two individual specialists who can't understand each other )

I guess one mechatron who can't understand himself is less confusion than two specialists who can't understand each other.

[jono035]

companies worldwide finding that mechatronics engineers ARE infact preferable to two individual specialists who can't understand each other

It has its place. My problem is more the mechatronics guys who pass themselves off as people who can do the job of either. They can't.

Maybe the course has got better since I graduated, but the mechatronics guys I knew and helped with EEE stuff were pretty hopeless...

[ital916]

I gave up as soon as i saw realwolf's massive post


dushy clearly missed my point, is trolling hard, and is jealous he can't do mechatronics (btw, the idea is not to replace a mechanical and electrical engineer, but to oversee the mechanical, electrical and software guys. NEWSFLASH; companies worldwide finding that mechatronics engineers ARE infact preferable to two individual specialists who can't understand each other )

+1 for jafa's post with pictures

Lame response andrew. Im not trolling, what, I start actually talking sense about an area I know stuff about and it is trolling. Me...jealous...of you or not being able to do mechatronics. Ha....Id be sooner jealous of sam, and that aint happening..ever. I chose to do mechanical as anything electrical bores me.

yet more statements without references...we are talking engineering here. Otherwise you have to go, "I believe comapnies worldwide..."

I find it is the mentality that mechatronics engineers believe themselves superior to either profession. I have friends in mechatronics who are extremely clever but they dont try and fool themselves into thinking they are the equivalent of both a mechanical and electrical engineer.

In the end we are all engineers...so lets be friends...which we are anyway.

[ital916]

Some yachts will sail a zigzag course downwind depending on what sail(s) they are carrying - IE a yacht flying an asymmetric spinnaker will sail a series of downwind reaches, whilst the far more commonly used symmetric spinnakers you point straight downwind and crack open the gin and tonic.

You can come racing with us some time if you're man enough.

Yeah, id be keen. Tell me when mate, Ill be up for it. You'd have to show me how to do stuff though. Like I said, I dont mind being wrong, hmmm I did study the affects of spinnaker and found that sailing the zig zag course was still quicker, though if you are gonna be lazy you can point it downwind, but it aint the fastest route. I can post diagrams too, but no one would understand thwm, now, where is the gin and tonic?

[jono035]

I find it is the mentality that mechatronics engineers believe themselves superior to either profession.

Same experience here, pissed me off greatly.

[metalhead]

Ouch!

I used to assemble these bikes and others for lifan NZ, go talk to jason who imports them if ya not insured, say you know mark and he may do you a better deal, i can put all the bits on for ya, just cover the gas for the cage to get to your place or pick up the parts if need be.

cheers for that mate but i do all the work on my bike myself and i can get trade for parts off a friend off my dad