I've had a Mk 1 Voyager for approx 4 years. It has MANY flights on it. One of the best flying sport planes I have ever come across. My engine is inverted - a Tower Hobbies .46BB. This is a great engine. I installed onboard glow and has not had any problems with engine tuning. You do have to shut off fuel flow to the engine between flights to prevent the carb from flooding when not in use - I use a fueler valve for this. I start the engine with the plane upside down. This is a bit inconvenient but the plane does look great with the engine inside the cowl. I modified my rudder and elevator- see picture - and now it does a great knife-edge ! ! I increased the control throw on my high rates and it is very aerobatic in that way. I bought a Mk11 for the day that the inevitable happens.