The Terrapin truck was designed to be amphibious by Thorncroft.
Each of the engines provided power, separately, to the four wheels on each side when on land. When in the water each engine drove a separate propeller. This caused problems when one engine would fail the other would continue to propel the Terrapin only on one side.
The engines were near the center of the vehicle which split the cargo area in two. This prevented guns or vehicles from being placed into the cargo area.
When fully loaded the Terrapin rode very low in the water and could easily be swamped in rough water.
The driver didn't have as good a view forward and aft as he was located in the center and relied on other crew members to guide him.
The front cargo area had a tarp that could be placed over it to keep out water spray. This had a side affect of restricting the driver's view forward.
As there were a lot of American DUKWs available Terrapin development was stopped.
The 79th Armored Division was the primary user of the Terrapin starting in the fall of 1944 in the waterways leading up to Antwerp.
|Crew||1 - 2, 2|
|Weight - loaded||26,411 lb, 26,488 lb
|Weight - empty||15,232 lb
|Ground contact length|
|Armor Thickness (mm)||None, 8|
|Engine (Make / Model)||2: Ford|
|Net HP||85 hp each|
|Fuel consumption - Road|
|Fuel consumption - Cross country|
|Power to Weight Ratio|
|Speed - Road||15 mph
|Speed - Cross Country|
|Water speed||5 mph
|Range - Road||150 miles
|Range - Cross Country|
|Wheels each side||4|