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Model Boats Website Team
January 2019: 12 people December 2018: 6 people November 2018: 11 people October 2018: 9 people September 2018: 13 people August 2018: 5 people July 2018: 8 people June 2018: 8 people May 2018: 7 people April 2018: 21 people
My suggestion would be to contact the Kehrer shop directly. They are most likely to answer any of your queries. Looking at the booster nozzle it looks like a circular section squeezed into a smaller square with the cross fins to straighten out the jet thrust.