The tear down and apex seal replacement job on my 20B turned out to be a 6 day ordeal instead of a quick 2 hour job but it's done and I can get back to finishing the RV-8 again.   Most of the problems were caused by inexperience (haven't had to tear down a rotary in over 12 years) and the fact that this was not a standard 20B but a mongrel built out of mostly 13B parts.    I went ahead and replaced the stock coolant O-rings with TES parts while replacing the Hurley apex seals. 

 

Did a careful weighing of parts to see exactly how much more the 20B weighs compared to the 2nd gen 13B.  Difference  is 70 lbs, about 3 pounds more than I previously thought.  This represents a 22% gain in installed weight compared to a 50% increase in power.  Not a bad trade.

 

Got up early this AM and launched for OSH but my PDA based GPS went dead 11 minutes after take-off.  Futzed with it for a while but no joy.  Returned to Shady Bend and found that the battery cover had popped loose and it shuts down when that happens : (    Put it back on but then found that it will pop off at the slightest touch.  Taped it shut and all seems well so will try again tomorrow morning.  Have to leave early to get in before field closes for airshow.

 

Tracy  (packing old GPS in plane for backup)