On Mon, 15 Aug 2005, Dwayne Reid wrote:

> At 12:33 PM 8/15/2005, KY1K wrote:
>> Not sure the blade speed monitor will work, I'm talking about large rocks 
>> that are partially buried. When the blades hit a rock, they don't really 
>> slow down much.....mostly because the housing tends to vibrate and flex to 
>> allow the blades to continue turning.
>
> I'm not sure if its been suggested yet, but how about installing a set of 
> swing blades?  These swing loosely on the hub and centrifugal force caused by 
> high-speed rotation causes them to open to nearly the full diameter.  They 
> simply fold out of the way and make loud noises when the tip of the blade 
> hits an immovable object.
>
> They aren't perfect but certainly seem to minimize the kind of damage you 
> mentioned.

Even better, why not use the 'string' blade type ? That and a rounded 
hub and who cares about stones and concrete ? No ?

Peter
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