Listing of all classes of boats

O.M.R.A racing classes.
As laid down in the O.M.R.A rule book.

OMRA classes are designated by engine size and type of ignition system used.

They are as follows:

Z

0 - 2.10cc

(0.129 cu in)

non spark ignition

Z class is further divided into standard and modified

AA

0 - 3.50cc

(0.21 cu in)

non spark ignition

 

A

3.51 - 7.50cc

(0.46 cu in)

non spark ignition

 

B

7.51 - 11.0cc

(0.67 cu in)

non spark ignition

 

C

11.01 - 50cc

(3.05 cu in)

non spark ignition

 

D

0 - 50cc

(3.05 cu in)

spark ignition only

Any mix of fuel is allowed in glow classes however, spark ignition class must use 'pump' petrol