---Over the years Piper made various design improvements with additional options available on the 260 and the Twin as they introduced the 'B' and 'C' models.

They also incorporated the Ray-Jay turbo charging system on some of their factory production specimens since there had been a tremendous after market demand for turbocharging.

---In 1969 the PA-39 replaced the PA-30 Twin Comanche. It was basically the same 'C' model Twin but with counter rotating propellers

In 1972, there was a flood at the Piper production facility at Lock Haven, Pennsylvania. Tooling and patterns were lost to the flood, and the production of Comanches stopped that year.

---In late 1972, Piper began development of an improved Comanche model which was to be common with the PA-40 Arapaho. In 1973 Piper engineering obtained a flood damaged PA-24 fuselage to begin with the new design, which they hoped to market in 1974 in conjunction with the Arapaho. It was later determined that the cost to produce this model would be very expensive so the project was canceled.

---This is an example of a late model Comanche. This turbo PA-39 is owned by Dave Buttle, and with the modern paint scheme, and a couple of speed mods, it illustrates that the Comanche airframe design was well ahead of its time.