Based on the thor missile the thor delta was a modified thor with an able 2. stage (se Thor able) and at the top of the able an altair 3. stage.
Being the fourth configuration for the upper stage it was named Delta (The fourth letter of the Greek alphabet).
This is the 11th fligth of the early Delta rockets. The
It launched the early communication satellite Telstar 1 from Cape Canaveral on July 10, 1962.
Eventually the entire Thor-Delta launch vehicle came to be called simply, "Delta." The first twelve Deltas are in the aftermath often called (omitting Thor) Delta DM-19.
About the model
Thanks to Eric Truax and Vadasz Laszlo for sharing this model for which Vadasz
awarded with the hungarian
Telstar 1 medal.
And to the guys at Space-Paper-Models for helping naming the vehicle correctly.
Sources on Delta 11 (Telstar 1):
Books and articles:
The Rocket - The History and Development of Rocket and Missile Technology by David Baker.
Rockets of the world by Peter Alway,