I've built the Madamoiselle (monoplane version) and flown it for well over 100 hours in the air. Should fly even better with four wings! Please answer some questions first:
1. Motor and gearbox ratio (GWS IPS?, What letter is on front of spur gear, "A"?)
2. Prop type
3. battery- cell type, size and quantity
4. Speed control
5. Total all-up weight
Of course the first question always is "Is the type on the prop facing forwards"