> I have a question that I have asked so many and everyone at the local
 >   flying field here has a different answer.  First, my question, is
 >   there guide lines that a person could go by when trying to decide what
 >   propeller to use with a particular size engine???  I have bought
 >   several used engines and I cannot figure out what is the right prop to
 >   use and which is wrong.  I have the following types:  OS .10, TIGER
 >   .40, K & B .61, and a .25 .......    If someone could tell me what the
 >   proper props are to use (and what makes one different from another) I
 >   would greatly apprecaite it....
 >  
 >   Thanks   Ken >
 >  
 
Ken,
Roger Marshall gave you some good advice on props.  But, I would like to add
a bit.  Keep in mind that not all props are the same.  That is, with all the
different manufacturers out there a given engine might run as well with a 
10-6 from one manufacturer as it does on an 11-5 from another.  When 
experimenting with props it is a good idea to stick with one manufacturer to
start with.  Also, very important, make sure your props are balanced.  On a 
given engine the wrong prop, balanced, can actually out perform the correct 
prop if it is not balanced.
I for one prefer wood props, mainly Top Flight.  I find them easier to 
balance and when they hit something soft, like fingers, they tend to break 
rather than chew.  Even a wood prop can do serious damage but from what I've
seen, the "plastic" ones do even more.  And don't let the little engines 
fool you.  They're just as hungry as the big ones.
When experimenting with different props the rule of thumb is when you 
increase one number you decrease the other by the same amount.  This isn't 
exact but, it is a good starting point.  Also, if you're going to start 
experimenting with different props, get a tach.  Good ones are not that 
expensive and they can save an engine.
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