I have a 6A (160 HP) with a Catto 2 blade set up for a 160 HP 9A. I went up to 8K DA yesterday (cold air) and got around 2800 RPM at Peak or a bit ROP. I was getting close to 2750 in the summer, which makes sense given the lower density of the warm air. I then went LOP and the RPM dropped down to 2700 and gave me 190-192 TAS @ 8 GPH. I think that I am happy with this. Furhter, my EGT spread shrinks a bit at WOT. Being a bit finer pitched than optimum would seem to give me better climb performance and the ability for a bit more TAS at higher altitudes (I have O2 and plan x-country travel).
At 8K, 2800 RPM and ROP, my Dynon was showing 79% power. I am guessing that by going LOP to reduce RPM to 2700 should leave me safe for LOP operation. I assuming that once LOP and 2700 RPM I am under 75%.
I was hoping others could chime in and help to validate my thinking here. Could I get a higher TAS cruise speed with a bit of a coarser pitch?
Thanks,
Larry
At 8K, 2800 RPM and ROP, my Dynon was showing 79% power. I am guessing that by going LOP to reduce RPM to 2700 should leave me safe for LOP operation. I assuming that once LOP and 2700 RPM I am under 75%.
I was hoping others could chime in and help to validate my thinking here. Could I get a higher TAS cruise speed with a bit of a coarser pitch?
Thanks,
Larry
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