M20F Speed Checks... Comparison Please?

[Lood]

Hi Tony,

 

Well, I did my flight yesterday and here are my results. I must add that I might not have given things enough time to settle after going LOP, but the result are indeed eye opening. I think I've just convinced myself that LOP is indeed the way to go. I can save more that R6k in fuel, on my trips to the Kalahari alone!!

FWIW, the exercise, to set ROP and then power back to the LOP fuel flow is not worth it at all. Although I did use substantially less fuel than when ROP, the speed decrease is rather dramatic - 19kts in my case and as you'll see in the table, the temps stay put.

 

Below is my simple table:

 

 

 

 

 

 

 

ZS-EMH Data.pdf

[Tony__L]

Hi Lood,

Thanks for the data. Interesting exercise reducing to LOP FF to see performance. The speed decrease is rather dramatic.

This aspect of this thread has been extremely interesting to me and has added another dimension to flying for me.

Tony

[Lood]

Indeed Tony. The most noticeable part when coming back on the power to simulate LOP FF, was the amount of nose up trim needed to maintain altitude as well the the much higher nose attitude as a result of the low speed.

 

I always knew that there was some degree of saving involved, but never realized that so much could be saved. Doing the math on my average annual hours, I can actually save almost R12k per year. That's almost 50% of a normal MPI!