The main saftey issue with running methonal R/C engines is that methanol burns clear. This means to safely run you need to put dye in the fuel so itll burn with a colour that could be seen. I know from building model planes theres nothing worse then starting a plane which then catches fire, because you dont know if the flames are over the carberator port for fuels lines. The only problem with dyes is they eventually degrade the engine, but I think life expectancy is a little consideration is this hobby.