I recently purchased a 1960 C175 with the subject STC installed. Is there a SFM that was issued with the STC? The previous owner did not have one in the airplane records. I contacted the WIlliams via email here: [email protected] with no luck.

No, not listed in the STC or relating documents. There is placard data and instrument markings plus limitations on engine and propeller but no specific Supplement Flight Manual.

Correct....no flight manual supplement, and in fact no flight manual for the 175.

MTV

Thank you for your replies. I was hoping there would be supplemental information like the Air Plains STC. Performance planning is difficult due to the aircraft being equipped with a constant speed prop. I'm trying to use performance data from the 172RG and 172Q POHs to put some sort of performance tables together. I rent the airplane, so I would like to give pilots something more than "plan for 10 gals an hour".

socal175 wrote: Performance planning is difficult due to the aircraft being equipped with a constant speed prop. I'm trying to use performance data from the 172RG and 172Q POHs to put some sort of performance tables together. I rent the airplane, so I would like to give pilots something more than "plan for 10 gals an hour".

The CS prop is why it's difficult to predict such information. Really depends on where the individual pilot places the controls. Sounds like you're on the right track, though. Good first steps.

Also, different props make a pretty significant difference when it comes to performance. And, operations "Oversquare" can significantly reduce fuel flows. You won't find data on fuel flows anywhere on that range, though Lycoming actually permits operation there.

I'll try to post a picture of a Husky Operating Manual page....the Husky has an O-360 and CS prop, so data should be similar, except speeds.

MTV