CS-VLA 925 Propeller clearance
Unless smaller clearances are substantiated, propeller clearances with the aeroplane at maximum weight, with the most adverse centre of gravity, and with the propeller in the most adverse pitch position, may not be less than the following:
(a)
Ground clearance. There must be a clearance of at least 180 mm (for each aeroplane with nose wheel landing gear) or
230 mm (for each aeroplane with tail wheel landing gear) between each propeller and the ground with the landing gear statically deflected and in the level, normal take-off, or taxying
attitude, whichever is most critical.
In addition, for each aeroplane with conventional landing gear struts using fluid or mechanical means for absorbing landing shocks,
there must be positive clearance between the propeller and the ground in the level take-off attitude with the critical tyre completely deflated and the corresponding landing gear strut bottomed. Positive clearance for aeroplanes using leaf spring struts is shown with a deflection corresponding to 1?5 g.
(b) Water clearance. There must be a clearance of at least 46 mm between each propeller and the water, unless compliance with CS-VLA 239 can be shown with a lesser clearance.
(c) Structural clearance. There must be ?
(1) At least 26 mm radial clearance between the blade tips and the aeroplane structure, plus any additional radial Clearance necessary to prevent harmful vibration;
(2) At least 13 mm longitudinal clearance between the propeller blades or cuffs and stationary parts of the aeroplane;
and
(3) Positive clearance between other rotating parts of the propeller or spinner and stationary parts of the aeroplane
.(d) Clearance from occupant(s). There must be adequate clearance between the occupant(s) and the propeller such that it is not possible for the occupant(s), when seated and strapped in, to contact the propeller inadvertently.
) familiar with the USA rules, but get the impression you can largely do as you wish?
