range. However, this assumes that the only relevant source of energy is the binding energy of the envelope. For the orbit to widen in the course of mass loss, Eq.(\[allam\]) requires an influx of energy outside of that which is available on a dynamical timescale. This is not at all unphysical for dynamically stable MT via RLOF, which may take place on the thermal or nuclear timescale and is driven by the nuclear burning of the donor. Therefore the cause for this unphysical behaviour would seem to be immediately clear; stable MT via RLOF can in many cases provide a clear solution for the removal of the initial primary’s envelope.

However, the possibility that stable conservative MT could account for this stage was previously ruled out. [@Nelemans00] empirically analyzed Algol type MT, specifically MT initiated while the donor is still on the main sequence. In a later study [@Sluys2006], conservative MT was considered and rejected once more. We note however that neither of the studies performed the detailed evolution for giant donors at the start of the MT. [@Nelemans00] empirically analyzed only stars with less than 50% of the outer envelope being convective at RLOF (e.g., for a $1.2\,M_\odot$ star, 