Wow, there's some magic at work here! Maybe a 10 mph tailwind  :)
Seriously, a linear extrapolation would put the speed at 196 mph not 206 mph with an RPM increase from 5350 (180 mph) to 5820. Or put another way, would expect at least 6100 RPM for 206 mph.

Finn

Bill Eslick wrote:

What was the difference in engine rpm at top speed Bill?   Tracy   ==================================================   Here is all the info:   With muffler, WOT at 3000 msl gives about 5350 rpm, 180 mph true.  (156 knots)   Without, WOT at 3000 msl gives about 5820 rpm, 206 mph true.  (179 knots)   OAT was 30 C.   Tracy, the 120 mph climb rpm was 4800 with the muffler,  4880 without it.   Bill

____________________________________________________
  IncrediMail - Email has finally evolved - Click Here