Armature Wind Specifications
Motor # Turns Gauge Stack L Stack D Comments
JK Falcon F7 65 30 .375" .513" 15 Degree timing with internal brushes and springs. A cheap motor great for D3 and Flexis
TSR D3 65 30 .375" .513" 3 Degree timing with internal brushes and springs. Great for D3 racing
 Euro Mk1 80 31 .400" .513" 20 Degree timed Chinese made for Pro Slot. External brushes and springs
Puppy Dog 75 - 80 31 .400" .513" 25 Degree timed American made sealed motor. External brushes and springs. PS Euro Mk1
16D 70 30 .600"   Cheap Chinese junk arm, n/balanced, need to buy 20 to get good one, D-can setup, uses S16D magnets
Contender Sportsman Competitor Challenger II 55 30 .440"   C-can setup, available balanced and unbalanced, consistent US made arms
Super 16D 60 28 .500"   Balanced, D-can setup, Chinese and US arms available
Super 16C 55 28 .490" .513" C-can setup, close to Group 12 in performance, used in GTP classes where C-can are used
Outlaw Super 16D 55 28 .450" .513"  
Box Stock 12 50 29 .350"
Box Stock 15 50 29 .440" .513"
Wasp   Super Wasp Hornet 60 30 .350"   C-can setup, slight edge on the Group 11
Group 11 55 30 .440"   C-can setup, aka Challenger II, Competitor, Contender & Sportsman, popular in GT-1, beginners wing car, National 4.5", NASCAR, JRL
Group 12 50 29 .350" * Used in Box stock wing cars, Scale Group12, GTP 12, Outlaw 12, X-12 usually just means X-tra high timing. This arm is also configured for strap motors where the armature can be smaller than .513"
Group 15 50 29 .440" * * 12 & 15 come in varying diameters and are used in setups from C-cans to cobalt strap setups for various classes
Group 20 38 27 .440" .513" C-can setup used in wing cars and Drag Racing
Group 27 38 27 .440"   Hand wound, any diameter, used in cobalt strap setups
Open or Group 7         Anything goes

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