myusername Posted November 19, 2013 Share Posted November 19, 2013 To make a long story short... My PAP was lying up for approx. 2 months until the end of October. I knew the fuel in it would have gone stale but ran a little test out of curiosity (Yes I should have drained it...I didn't expect to be grounded for so long). The old fuel in it after 2mths was getting approx. 8400rpm (+/- 60rpm) according to my tinytach. Drained and refilled with regular 95 octane it was then getting approx. 9600rpm. That's a 12% decrease in volatility in approximately 2 months. So, after refilling 2 1/2 weeks ago the weather has been crap and its been sitting up again, this time for 2 1/2 weeks. Today I went out and was getting approx. 8600rpm. That's a 10% decrease in volatility in approx. 2 1/2 weeks. So therefore my fuel incurs 83% of its total 2 month volatility loss within the first 2 1/2 weeks. What's worse, I found out today that in a 6-9mph headwind, that extra 1000rpm is the difference between me climbing out or just running aimlessly along the ground! So after a quick google trawl here's my questions... 1. Does anyone use premium 97/98 octane, super 98/99 octane or high performance 102 octane in their motor and what difference do you see in RPM? 2. Has anyone ever used a stabiliser in their paramotor fuel and how did it go? 3. General thoughts? I need to get my hands on some premium unleaded to measure the rpm at 97 octane but it seems very few forecourts sell it anymore. Quote Link to comment Share on other sites More sharing options...
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