With regard to DLE power compaired to glow I have direct comparision. Started with VQ 63" WS Hurricane. Had .91FS in it that was running bad. Couldn't figure out why. Plane had heavy hub and lead to get correct cg. The 91 with lead and a 120 OS FS weighted the same. Had a 120 on the shelf, so no use hauling around lead when you can have more cubic inches. Any way, the 120 turned a 3 Blade Graupner 15-8 prop 8,400 rpm. The plane had more than enough power.

In my converting the fleet to gas I decided to see if I could get a DLE 20 into the Hurricane. Finally did. Didnt want to mess up cowling so installed a straight pipe. Turned the same prop 9,100 rpm but was too LOUD. Put on stock muffler and butchered the cowl. With stock muffler turns the same prop 8,800 rpm.

The DLE has a little more power than the 120 and a WHOLE LOT more power than the .91FS