In the name 7gjs26.5-100,

26.5 is the horsepower, it is 26.5kw(40hp).

100 is the shaft length, it is 100cm.

The shaft length can be changed based on your requirement.

outboard propeller details:

Specification:         100----180 cm;

Dynamics:             40----50 hp;

Match boat:          30----50T;

No-load speed:     10----11km/h;

Packing size:         110cm*45cm*28cm;

G.W.:                     220kg;

N.W.:                     200kg;

The below two pictures show what the shaft length is: 

7gjs26.5-100 40hp diesel outboard motor with marine engineeller