Could've sworn I posted this ages ago.
I was wondering why 15 degrees seemed to be about the right windward heel for best performance upwind. Also wondered how much lift was actually required by the foil at such a heel angle and the transverse force balance of a moth at such a heel angle. Was fairly convinced this was all related so I developed a spreadsheet to find the heel angle that balances the vertical and transverse forces determined from the righting moments.
If anyone wants a copy to play with, let me know and I'll email it to you.
Wednesday, August 17, 2011
Monday, August 1, 2011
something to correct for narkla's recent left leaning posts...
[Scene: A car yard. BRYAN is perusing the stock. He is approached by JOHN]
John: Morning! Looking for a new car?
Bryan: Nope. New Prime Minister, actually.
John: You’re the third one this morning. Anything in mind?
Bryan: You know....... nothing fancy, reliable, economical family model. Something to get the country from A to B.
John: You mean like a Howard?
Bryan: Yeah....a little Johnny. Nothing flash, does the job. Low maintenance, economical, sensible. Runs for years, no troubles.
John: So.... you used to have one?
Bryan: Yeah. About 10 years. Great little model – don’t know why I got rid of him -- biggest mistake I’ve ever made…
John: What happened?
Bryan: Traded him in for a Kevin 07.
John: Big mistake…
Bryan: Lot of people bought it. Good political mileage.
John: How was the Kevin 07?
Bryan: Came with a $900 factory rebate – that was good.
John: Anything else?
Bryan: Not much. Sounded nice but nothing under the bonnet. It was a lemon.
John: Didn’t stick around for long did it?
Bryan: Nah – had a factory recall. Shipped overseas and was never seen again.
John: What was the problem?
Bryan: Lots. But the final straw was the navigation system. Plug it in and it automatically loses its own way.
John: Whatcha got now?
Bryan: It’s a Gillard-Brown.
John: The hybrid?
Bryan: Yeah. The Eco-drive system – not a good idea. An engine that can’t deliver hooked up to a transmission stuck in permanent reverse…
John: Green paintwork with a red interior. And steering that always lurches to the left for no apparent reason – that’s the one?
Bryan: The Fustercluck model.
John: The only one they made, Bryan. Not the vehicle of choice for the road to recovery – but did they finish up fixing the navigation system?
Bryan: Made it worse. Turn it on and it does a press release, heads off in all directions and goes nowhere.
John: So that’s why you’re here?
Bryan: That’s right. I’m stuck with a government that's wasteful, expensive, ineffective and past its use by date. I don’t suppose you’ve heard of the “Cash for Clunkers” scheme?
John: Join the queue brother.
will get back into moths soon, just waiting for it to warm up.
and finish getting married.
and finish cresta #1.