Written by Rob Turnbull Monday, 30 November 2009 22:54
This is a video of a flight on my Avant Aurora Ultimate 90, fitted with a GP Exhaust Nitropower 91 on the OS 91 HZ engine.
The video was shot on the first flight of the day so the engine needed to warm up, as did the thumbs!
The power delivered by this muffler is excellent. The tuning band is fairly wide and is quite forgiving of richer running engines. To get the power you generally need to tune your engine leaner although the GP Exhaust is quite forgiving here and as you can see in the video, there is a good smoke trail using Optifuel 30%, so I'm running a fairly rich setup while still pulling bags of power!
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