Whats the deal with this number 30

Status: Passed
Results: 400826 (cyc: 2, node: 100)
CPU Time: 0.078
Score: 80165.3
Submitted at: 2010-11-16 23:49:10 UTC
Scored at: 2010-11-16 23:49:45 UTC

Current Rank: 2553rd (Highest: 2163rd )
Based on: Nexus100 000 (diff)

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Code

function [thrustRow, thrustCol] = amit_brad(chart, aIndex, bIndex, maxThrottle)
[aby abx]=ind2sub(size(chart),[aIndex; bIndex]);
d = (diff([aby abx]).*[1.004 0.9996])';
R=norm(d,1)
if R<30
    R=30;
end
t = round(maxThrottle.*d/(30/R+R) * [1 1 -ones(1,4) zeros(1,3)]);
thrustRow = t(1,:);
thrustCol = t(2,:);