Jan,

What is the recommended timeframe for a gearbox coupling replacement on my HF-110?

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Are you referencing the torsion damper or the actual coupling itself. The torsion damper every 5 years. The other should never need to be changed unless it hasn't done the SB's

I'm referring to the 3 rubber couplings that go to the gearbox

Those are every 5 years :)

Thanks 

By the way. I took a 3 hour cross country in the 701 with the HF-110 and it ran like a top.  

3500 ft msl 

70 mph

4750 rpm

warp drive pitch 13 degrees

85 C water temp

76 C oil temp

67 psi oil press

140 F gearbox

Looks great John, The cool thing is you have one of the very first Vikings ever made, the HF-110 is like owning a piece of history. Very happy everything is working as intended. Like what matte paint does, gives things a more rugged/utility look. 

Thanks Jan,

Do think increasing the pitch on the Warp Drive prop would make any difference?

Takeoff RPM is 5,500 

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