Many general aviation, full scale airplanes depend on the spinner to direct cooling air into the cowling,
and operation without a spinner is not recommended. I doubt that it makes much difference on our
models.
The number one reason to run a spinner on our models is to protect the engine, particularly the crank-
shaft, from crash dammage! Most cheap spinners rob more power then any benefit they might contribute.
Now that we have modern telemetry systems that can tell us airspeed, someone needs to do a spinner
study? My guess is that most models would be faster without a spinner? Keep in mind that most of our
models are so over powered, that small aerodynamic improvements will go unnoticed.
Just my opinion. Greg