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Date: Fri, 8 Dec 2006 11:09:06 -0800 (PST)
From: Perry Mick <pjmick@verizon.net>
Subject: direct drive
To: flyrotary@lancaironline.net
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No, I installed a 2.17 RD-1B in Dec. 2004. Now it's a 62" prop/6400 engine rpm, used to be 38" fan/5400 RPM.
   
  I presume a Buttercup is a tractor design? I can't see direct-drive working in a rotary except in a ducted fan, because the engine just doesn't develop enough power at 3000 RPM. Maybe with PPorts and supercharger, and aluminum side housings to reduce weight?
   
  >Perry are you still using direct drive? What max RPM are you or >were you using, what prop, etc. A friend who is building a >Buttercup (Steve Whitman design) that only needs 100/125 hp. 13B >with redrive is too heavy but without a drive it is a >possibility. Jerry


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<div><FONT face="Courier New">No, I installed a 2.17 RD-1B in Dec. 2004. Now it's a 62" prop/6400 engine rpm, used to be 38" fan/5400 RPM.</FONT></div>  <div><FONT face="Courier New"></FONT>&nbsp;</div>  <div><FONT face="Courier New">I presume a Buttercup is a tractor design? I can't see direct-drive working in a rotary except in a ducted fan, because the engine just doesn't develop enough power at 3000 RPM. Maybe with PPorts and supercharger, and aluminum side housings to reduce weight?</FONT></div>  <div><FONT face="Courier New"></FONT>&nbsp;</div>  <div><FONT face="Courier New">&gt;Perry are you still using direct drive? What max RPM are you or &gt;were you using, what prop, etc. A friend who is building a &gt;Buttercup (Steve Whitman design) that only needs 100/125 hp. 13B &gt;with redrive is too heavy but without a drive it is a &gt;possibility. Jerry</FONT><BR></div>
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