In a message dated 3/31/2007 8:17:49 A.M. Eastern Standard Time, atlasyts@bellsouth.net writes:

Patrick Panzera wrote:
>
>> What's the consensus on this?
>>
>> http://www.americanrotaryengine.com/id10.html
>>
>> Thanks!
>>
>> Pat

 

Well the 2.29:1 is a little tall for a rotary with over 70" of prop. But not real bad. 3056 prop RPM at 7,000 engine RPM,  2,838 Prop RPM at 6,500 engine RPM. 2,620 prop RPM at 6,000 engine RPM. 2,401 Prop RPM at 5,500 engine RPM.

 

It is a bit heavy.

 

The offset thrust line is of benefit for a longer prop. But then there is the ratio problem.

 

It is all custom parts, with only one source.

 

Adkins has a nice web site.

 

The price is a deal killer.

 

 

Tracy's reduction at 2.78:1 can swing a long prop or a three bladed prop for more ground clearance.

 

2,517 prop RPM at 7,000 engine RPM. 2,338 prop RPM at 6,500 prop RPM, 2,158 prop RPM at 6000 engine RPM, and 1,798 prop RPM at 5,500 engine RPM.

 

 

 

Tracy's system is lighter.

 

Tracy's system uses over the counter Ford parts.

 

Tracy's system has a zillion hours in the air, in a large number of airplanes.

 

The designer of Tracy's system (Tracy) is still alive and can be contacted via phone and Email.

 

You can sleep at Tracy's house for the fly-in.

 

Tracy will overhaul your Tracy redrive every year if you like.

 

Tracy's price is right.

 

Tracy's system is available now.

 

Tracy's system is available for other than rotary engines.

 

Tracy has a nice web site.

 

Tracy wins hands down.

 

 

Lynn E. Hanover