Simon Obst's Page

"Hi Simon, Obviously I have a vested interest here so please sxcuse me! but you may find the following of…"

" I use jetteck from Ian Williams I have had a laptop die and Ian helped me get on my new one for free."

"  Sorry Martin, I can't find my original sources again and I can't for the life of me remember how I came up with the air density calculation. As for the jet formula, it was just a linear regression function to best fit the data…"

"richard, can you supply me with a reference to where that formula came from"

"Hey Simon... I've got a couple that I use and am running them on IPAD. Will show you this weekend!  "

"Wow Richard that is a great spreadsheet. I will test it against my friends old HP calculator and see if they are close. This will give me a good starting point anyway. I will also have to look at the jet tech software. I did find one on itunes store…"

"Hi Go to www.rotaxjetting.com I have used max jet for almost 10 years now and jet tech for 2 years, jet tech is much better with great support. You need to get a laptop though. But just a cheep one will do"

"Pleasure to be of some assistance."

"I punched all the data from the Rotax jetting charts into a spreadsheet and came up with:   Jet = 87.848 * absolute air density + 61.988 where absolute air density = ((0.4646*(air…"

"I use a 6 year old Toshiba Satelite Pro 4600.  Anything that will run Win XP or better should do the trick.  I do not beleive either app is supported by the IPhone or Android - yet! "

"Thanks for the advice guys. What platform do these applications run on? I mean do i need a laptop at the track or do these run on iphone or android. "

"Hello Simon, I use both the JetTech application from Ian Williams / John Savage at www.iwt.com.au and Jet-Plus from John Davidson at www.jdecs.com.au.  Both are very well supported products.  Both applications require some degree of…"

"Thanks for you advice Richard or should I say DICK!! I am unsure how a weather station and your ears can work in combination if you not using some sort of chart or calculator. Maybe you need to you need to pop along to your doctor and see if there…"

"Don't need a Chart or Calculator, Just a Weather Station showing variations in barometric pressure & ears (the things on the side of your head). Should be able to suss the correct jetting with 2-3 quick(4 lap) sesions. Also, when going to a…"

"You can buy JetTech software thru Ian Williams Tuning in Adelaidehttp://www.iwt.com.au/JetTech.htm If you are looking at the Rotax supplied jet charts,  you might want to read this first http://www.iwt.com.au/maxjettingchart.HTM ;"

"I still have one clubman left to sell for $2000. For those of you technically minded the specs are below. Bore: 52.621 Exhaust: 176 degrees Transfers: 120 & 120.5 degrees  intake: 159 degrees contact me at simonobst@bigpond.com Thanks."