Avro C.30A 3-view drawing from NACA-AC-196
NACA Aircraft Circular
1934-09-01
<a rel="nofollow" class="external free" href="https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19930090361.pdf">https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19930090361.pdf</a>