I'd have called it a chisel plough, a spring tyne tiller would be more like a scarifier, like this, which ironically was listed as a chisel plough....
3PL Cult.jpg
I have a 7 tyne connor shea chisel plough that will stop my 100HP tractor in high range and does penetrate up to 12 inches, I've never used a scarifier that can do that. Conversely when i was a youngster the oldies bought a Case chisel plough that would never dig in deep enough to even slow down our 60HP tractor. It seems that MF may have used their own terminology to describe the plough that Homestar has so we are all probably right....
It makes searching for tillage equipment on the internet interesting though when things are called by different names.
Regards,
Tote
				
			 
			
		 
			
				
			
			
				Go home, your igloo is on fire....
2014 Chile Red  L494 RRS Autobiography Supercharged
MY2016 Aintree Green Defender 130 Cab Chassis
1957 Series 1 107 ute - In pieces
1974 F250 Highboy - Very rusty project 
Assorted Falcons and Jeeps.....
			
			
		 
	
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