[QUOTE="Kevin"] Don't understand your quetion?[/QUOTE] Tonqe in chek Kevn? N/
I reckon a bike visor will get colder than dive masks due to wind chill factor. Water can only go to 4°C before it does a phase change to ice and drops a heap of energy. But even in Tassie, we dive in water that is rarely colder than 10°C. Riding at 100km/h (in first gear) would generate a wind chill factor wway lower than that if ambient tempature was, say, 15°C.
I think "wind chill factor" will get an inanimate object to ambient temp. quicker but will not take the object below ambient temperature. MikeH
their is a diffrence between glasses and contacts and refractive index changes in the water, so was wundering what your rating for glasses was.
Hehe. A while since I've seen someone fall for the wind-chill factor on objects. Theo ******************************************* About the same time as it would take for people to wake up to Kev's 100 kph in 1st gear
Wind chill is the apparent temperature felt on exposed skin due to wind, an inanimate object can not feel therfore wind chill is not relevant. Boxer
No, but it does get affected by the ambient temperature, which would make it a factor. I know my visor's more prone to fogging when it's cold.
I have a great tip for you yeebok, Have you ever noticed that it doesn't fog up till you put it on and breathe on it, So, easy solution put yout helmet on and stop breathing
If you think you're contesting what I said, you've got it the wrong way round! (put a smiley face here!) MikeH (I think I need an editor, or a life. Mind you though, I think I need a guru r/e valuer more at the moment.)
Yes, its usually known as a golden shower. -- - KRudd at his finest. "The Labour Party is corrupt beyond redemption!" - Labour hasbeen Mark Latham in a moment of honest clarity. "This is the recession we had to have!" - Paul Keating explaining why he gave Australia another Labour recession. "Silly old bugger!" - Well known ACTU pisspot and sometime Labour prime minister Bob Hawke responding to a pensioner who dared ask for more. "By 1990, no child will live in poverty" - Bob Hawke again, desperate to win another election. "A billion trees ..." - Borke, pissed as a newt again. "Well may we say 'God save the Queen' because nothing will save the governor general!" - Egotistical shithead and pompous fuckwit E.G. Whitlam whining about his appointee for Governor General John Kerr.
Huh? A mate got a Z1 back in '72 and that did 110 in first, though I'm not sure 11,000 rpm was recommended on them. Theo
Well contact lenses worked fine for me so never tried the prescription mask. Contacts aren't any difference than normal vision underwater. I can see a case where the prescription mask would possibly require a different perscription. But as I said earlier I like the ability to surface and remove the mask and still see where the **** I is. I was willing to pay the cost of losing a lens for that. But it hasn't happened yet in 30 years.
That's a hard call. I think you'll find wind chill factor is a pretty big issue. We have a little lever in light aircraft called Carburettor Heat that comes into play as you are landing the aircraft as you have pulled back the throttle to descend but the aircraft is still travelling at around 200 km/h. Because the engine is throtted back it isn't generating as much heat as it was at cruise. That airflow over the carbs will generate ice that can stall the engine. The carb heat lever diverts hot air from the exhaust to the carbs to stop icing (and the follow on event of plummeting from the sky). As an aside, I had fun doing a downwind approach to Launceston airport years ago (Fark, 32 years ago) and went to pull carb heat on in a Piper Cherokee Archer II. The carb heat is next to the mixture control. I reached over to pull the carb heat on, but by accident pulled the mixture control back. To cut off. At 500 feet above the ground. The engine coughed and I realised what I had done and pushed the mixture forward and the engine re-fired. **** that was close. We were flying over a dense forest and too low for recovery. Although at the time I was alongside the terminal at the airport and with 500ft I could probably have abandoned final approach and just pulled the plane around immediately and dropped onto what is a long jet runway. But I'm glad I didn't have to try it. Cherokees land in a pretty short distance, but without power they tend to drop out of the sky a lot quicker than a Cessna. They are more fun than a Cessna though but drink lots of fuel. I'll keep rambling coz I'm bored. That flight on the cut-out was when there was a US Destroyer moored in the Tamar River. Me and 3 other mates decided we'd go and check it out - it was quite unusual back then even though we get lots of ships into Tassie now. So we flew 50km up the Tamar and flew around this destroyer at around 300ft getting photos and checking it out. Could you imagine doing that these days? We'd be shot out of the sky Even before 9/11 the USS Abraham Lincoln aircraft carrier was moored off Opossum Bay at the mouth of the Derwent. 2000 I think. Kerry and I were invited on board on a Sunday afternoon for cocktails and drinkies with the Captain. There was about 50 of us and we were all assigned a crew member to show us around the ship. Kerry and I had a Tomcat pilot assigned to us. The day before we had set up an outdoor gig at the end of the peninsula about 500m from where the ship was moored. (The carriers aren't allowed to park in Hobart as they are nuclear powered so they have to stay down the river and ferry the crew in for their break). Anyway, because this was an outdoor gig we had to truck in 20 kW of generators and massive amps and stuff. I asked this pilot whether they had noticed all this happening the day before. He said yep. They had noticed on radar (wtf? what radar can pick that up?) and that they had a chopper overfly us to see what was going on. I don't recall a chopper going over so it might have been when we were off getting gear or at night when the bands were playing and I simply couldn't hear it. Talk about going off topic
Bullshit Read my other post. There's lots of factors that come into play including humidity (which can happen at cold temps). I've seen the difference. It happens. I've ridden in cold humid temperatures in Tas highlands and at speed that water in the air condenses out to ice on my jacket. I believe my jacket is an inanimate object. Well I hope they killed the cow before I wore it anyway.
