optimal f and futures lots traded

[Peter Ryan <pryan@xxxxxxxxxxxxxx>]

I am not clear on how to apply optimal f to the number of lots I should trade in a futures contract.
Could someone please help with the following:

Optimal f = 0.35
Biggest losing trade is $350.
Therefore I should trade 1 unit for every $1,000 (350/.35) in my account.   (pg 88 r.v.'s book)

Account size is $20,000.
The futures contract tick value is $10.  (not sure if this is relevant)

Based on this, how many lots should I trade ?

Thanks in advance
Peter