I replaced an OS 120 FS with a DLE 20 in a VQ Hurricane, and in a Top Flite P-40. Both worked out great. The biggest problem I had was I had to move both batteries forward into the cowling to balance with out adding weight. The OS turned a 15-8 three blade prop 8,250. The DLE turns same prop 8,550. This plane has way more power than needed. The P-40 power with the OS was just barely OK. With the DLE it has plenty of power but not way overpowered like the Hurricane.