Quote:
Originally Posted by David Z
If you fly off gravel runways, or even runways that aren't kept clean, then you will be able to dress out a lot of rock damage on a 74" that you won't be able to on a 72".
Although, if you are experienced and use good gravel techniques, shouldn't need to dress the prop much either 
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I have 100 hours on my nice new Hartell 72l
" and I already have two stone chips, both 12" from the tip.
I am very carefull on the ground and only fly from maintained airfields. This is with an RV7A. The 72" looks very close to the ground. When I phoned Vans last year about prop length they instantly said 72" even though their web site says 74".