My Facet burned the monokote once, but it was due to a hot start. The down angle of the turbine on the R54 may be contributing to the problem (reflected heat off of the pavement). It's only going to be a problem when the model is stationary and I'm guessing that it probably is not happening at WOT, but more likely during startup or low throttle. Some sort of simple deflector or stove pipe as mentioned by Nony will probably solve the problem. I stripped the monokote off of the bottom of my Facet tail and painted the area with 3 coats of BVM heat shield. I then painted over the heat shield with silver high temperature exhaust sytem paint.