.. Posted June 14, 2014 Share Posted June 14, 2014 Well after fitting out my Katana with the 55AX two stroke fitted it looked to need around 6 ounces of lead to balance it. I'd made a good effort to keep weight away from the tail using servo's lighter than the recommended units for the elevator and mounting the rudder servo inboard on a pull pull set up. So after a look at the spec sheets the 55AX comes in at 18.5 ounces and the 91 Surpass four stroke weighs 24.6 ounces. Ahh so there's my missing six ounces. I purchased a new mount to accommodate the larger four stroke and this needed a little fettling to accommodate the pump unit so I could get the engine the rite distance from the firewall. I maiden'd it yesterday and am very pleased indeed with it , just a few clicks of up were needed to get her flying straight & level. It flys at just under half throttle with the rest in reserve for some great vertical performance. The C of G was ok but I will move it back a little next time out, I have placed the tank back nearer the balance point resulting in a nice constant balance feel throughout the flight. Loops & cuban 8s are very nice and the stall is almost non existent so she has to be coaxed into a spin. I got about 50% of my stall turns looking ok but will need to work on my timing a bit. Quote Link to comment Share on other sites More sharing options...
Hangar 9 nut Posted June 14, 2014 Share Posted June 14, 2014 Nice combination Justin they fly so well with a four stroke ! Quote Link to comment Share on other sites More sharing options...
Allan Bowker Posted January 8, 2015 Share Posted January 8, 2015 Having a bit of difficulty fitting the Evolution Engines 15cc standard exhaust. Hopefully an extension will sort this. Quote Link to comment Share on other sites More sharing options...
Former Member Posted January 8, 2015 Share Posted January 8, 2015 [This posting has been removed] Quote Link to comment Share on other sites More sharing options...
.. Posted January 8, 2015 Share Posted January 8, 2015 You won't be disappointed Allan the bigger engine is the way to go. I had mine out on Sunday buy it was to foggy at our site to do anything more than low circuits. I suppose a pitts style can would be to loud ? Quote Link to comment Share on other sites More sharing options...
Allan Bowker Posted January 8, 2015 Share Posted January 8, 2015 Thanks guys; we are still doing the homework on which way to go. I was advised against the pitts style, due to them being ineffective Quote Link to comment Share on other sites More sharing options...
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