I am a big fan of Zenoah engines,I have G-38s, G-26s and a 25+ yrs. G-23 in my Balsa USA WW I airplanes. They seem to last forever and the weight in the nose is needed and they provide plenty power. In my last WW I plane, the 1/4 scale Spad XIII, before I the maiden flight I changed the engine from a 38 to a DLE-35Ra. I had to add weight in the nose, but it has plenty power and it will produce more power has it breaks in.
The G-38 is a great engine but it is not for all types of airplane especially the fast movers. Just bought out a guy, a couple airplanes, Laser with 35 DLE-Ra and a GP Giant Big Stick with a DA 50. I plan to sell the Laser and the DA 50 and put the 35-Ra on the Big Stick. The Big Stick is my type of airplane.
The DLE-35 is a great little engine an I am very please with it. I just hope that it will last as long as a Zenoah.
Fair Winds & Happy Flyin'
Rich