I have a GP Dazzler kit, which I will be building later in the year. I'm planning on using an Irvine 39 it in. I'm not sure whether these are available in Belgium, but they are gaining popularity over here - 25 sized engine, puts out more power than an Irvine 40. I currently run one in a Flair CAP230, and it will pull unlimited vertical with a 10.5 x 6 Bolly prop. It has never missed a beat since day one, and I have only ever had a deadstick when I ran out of fuel. It is a very classy engine.