Just looked at a pilot's forum if your aircraft has been STC'd (airplane speak for modified) to run autogas and you set it up to run Autogas but run 100LL your engine will run RICH if your engine is set up to run on 100LL but fuel it with with autogas it'll be lean, in fact lean enough to cause engine damage. Rotex (airplane engine manufacturer) recommends setting their engines up to run on Autogas but occasionally run a tank of 100LL through it. One forum pointed out that airplane engines are low-speed and relevantly low performance , a Continental IO 550 is 550 cubic inch engine rated at 300-301 horsepower. Low speed because you have to keep prop speed below the speed of sound or airflow over the prop gets messed up and your prop efficiency goes to heck. Pilots don't like gear boxes, they add weight and it's something more to go wrong, and a smaller engine turning more RPM's doesn't usually last as long. Another interesting comment is aviation fuels have different vaporization characteristics because they are made to be used at higher altitudes.
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Today's Featured Article - A Question for Dads This recent topic from the Tractor Talk discussion board is being highlighted because it is an awesome display of the caliber of individuals that have made this site their own. The young person asking questions received positive feedback and advice from total strangers who "told it like it is" with the care many reserve for their own kids. The advice is timeless... so although it isn't necessarily antique tractor related, it will be prominently displayed in our archives to honor those who have the courage to ask and those who have the courage to respond in an honest, positive manner.
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