Safety Officer Posted February 28, 2012 Report Share Posted February 28, 2012 There have been many numbers thrown around for the Rotax starting required rpm. We don't have magnetos we have trigger coils. In order for these to get excited and fire current to the plugs we need a minimum of 225-250 engine rpm which translates to 92-103 rpm using our 2.43:1 gearbox ratio. Now if your battery is weak and you only get 85 prop rpm or less it won't start. You can not tell the difference looking at the prop or listening between the 93 to 85. So if your aircraft doesn't start you need to use a newer battery or jump it to rule out the possibility of a poor battery. We have 5 trigger coils. 4 for our needed amps/voltage and one for the tach signal. Link to comment Share on other sites More sharing options...
airhound Posted November 8, 2012 Report Share Posted November 8, 2012 Are there Restrictions/Limitations/Cautions regarding jump starting a 912ULS from an auto or stand alone 12V vehicle battery, or portable booster/jumpstarter battery from Black and Decker etc? Link to comment Share on other sites More sharing options...
Roger Lee Posted November 8, 2012 Report Share Posted November 8, 2012 No, do like any other jump. Just do it right. Link to comment Share on other sites More sharing options...
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