Question: What is the maximum engine size that can be mounted on the VMAR Hornet 40-52 ARF without modifying the fuselage or engine mounts?

Answer: The Maximum engine size is a .52 2 stroke or about a .70 four stroke provided that it will physically fit.

Better Answer: We can only endorse the use of engines up to .52 2 stroke in size or other engine types such as a 4 stroke having similar power.

The specifications on the engine mounts are as follows:

Engine Mount Engine Width Max: 1.3 in. (32 mm)
Engine Mount Engine Lug Length Max using Factory drilled holes: .7 in. (18.5 mm)

Engine Mount Engine Lug Length Max if using Custom drilled holes: 1.5 in. (39 mm)
Engine Mount T-Bar Beam Length Max: 2.9 in. (74 mm)