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HH - Retro

   top opening Setback
1) Bob Newberry started removing material from bottom of front plate, to relive built up pressure in between rotors
 
 14-71
 (15.31")
None
2) SCS introduces the HH - "retro" blower around 1987.
 

 14-71
 
3) Through the 90s other companies start making HH - "retro" blowers.
 

 14-71
 
4) 1999 SSI builds the D rotor with a small top.
 
Small  
5) 2002 Kobelco makes k8 rotors and releases the superman for overdrive restricted classes. 
 
Small  
6) Littlefield K8, Kobelco K8s, Kobelco K8 Superman, SSI d-rotor 
 
Small  
7) 2008 Kobelco makes K11 rotor (superman), 
 
Small  
8) DMPE modded supermans, DMPE m5,, 
 
   
9)  Littlefield M  - LB
 
   
10)SSI F (HH) series - F2, F3, F4, F5
 
   
9) PSI (roots-HH) 
 
Several 1", 1.5". 2"
10) Fowler F-11 (was K-11 superman)