  A model distribution amplitude for the $\Delta^{+}(1232)$ isobar is proposed,
derived on the basis of the QCD sum-rule calculations of Farrar et al. combined
with those of Carlson and Poor. The transition form factor $\gamma p\Delta^{+}$
is calculated modeling the proton by selected distribution amplitudes.
Furthermore, predictions are made for some exclusive charmonium decays into
$\Delta\bar{\Delta}$. The obtained results are compared with other theoretical
models and with the available data.
