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Regarding Craig Catto's props, in my email exchanges with him, Craig 
has been very leery of the Rotax hub due to the forces his 3 bladed 
wood props generate; he much prefers, at a minimum, a SAE 1 hub/bolt 
circle for adequate bearing.
Fred
A194
On Friday, April 27, 2007, at 05:16  PM, Graham Singleton wrote:
> <grahamsingleton@btinternet.com>
>
> Now isn't that a coincidence! Craig also makes one of the favourite EZ 
> propellers, (3 blade). The other EZ favourite is Gary Hertzler's 2 
> blade "Silver Bullet" AFAIK both these guys use computer optimisation.
> BTW waiting list for either is quite long. Market opportunity for 
> someone. Wish I was a bit younger!
> Graham
>
> glenn crowder wrote:
>>   Hey Jeff - I am using a Catto fixed pitch 3 blade, 64 x 62 on my 
>> 125 hp EA81 powered
>> mono.  Here is an 8 page Vans Air Force forum thread that is 
>> discussing the Catto vs other
>> fixed pitch AND constant speed units.
>
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