Saville
Well Known Member
Sorry for the elementary primary School 101 question, but I want to be sure I understand. This is also a lesson I learned in taking things for granted.:
Over the weekend I updated my EFIS so that it showed airspeed in knots rather than MPH (was set to MPH when I bought the plane).
So then I flew some tests and noted indicated speeds - now in knots - of Power Off (clean/Landing Config) stalls, power on stalls etc. with the view of updating the POH.
I also decided to compare the existent settings on the EFIS and POH with the hard values specified in the builder's document. Things like Vfe, Vne etc just to be sure they are correct.
I saw the table shown in the the Thumbnail. I eliminated the values for the other RV's and kept only those for the RV-8, and also kept the MPH values and added my values in Knots.
We can ignore Vso and Vs1 as those values in knots are ones I obtained in last weekend's test flights and are not conversions from Van's MPH values.
Vfe - I was aghast to see that the top of the white arc on the plane was
not the stated 100mph, but 120mph. So that was changed to 87kts
(or 100mph)
I confess to being confused by the "Blue Line" and the Yellow Arc values.
1) I only know of "Blue Line" in multi-engine ops - Vyse.
- Besides which I don't have a blue line marking on my airspeed indicator.
2) I'm trying to differentiate between the "Yellow Arc" in this table and the
"Blue Line". I'm figuring that "Blue Line" means Va (142mph) and the
Yellow Arc runs from Vno to Vne (193mph to 230mph).
Is that the correct interpretation?
If so then I need to placard 123kts (142mph)for Va (no full control deflection),
and set the EFIS yellow arc for 168-200kts (193-230 mph).
Presently my yellow arc starts at 180mph. I have no idea where that number came from. It's conservative from the standpoint of Vno so it's value doesn't scare me like the Vfe value did.
So I learned a lesson in taking settings for granted.
Or maybe I'm misinterpreting these values in which case correction is appreciated.
Over the weekend I updated my EFIS so that it showed airspeed in knots rather than MPH (was set to MPH when I bought the plane).
So then I flew some tests and noted indicated speeds - now in knots - of Power Off (clean/Landing Config) stalls, power on stalls etc. with the view of updating the POH.
I also decided to compare the existent settings on the EFIS and POH with the hard values specified in the builder's document. Things like Vfe, Vne etc just to be sure they are correct.
I saw the table shown in the the Thumbnail. I eliminated the values for the other RV's and kept only those for the RV-8, and also kept the MPH values and added my values in Knots.
We can ignore Vso and Vs1 as those values in knots are ones I obtained in last weekend's test flights and are not conversions from Van's MPH values.
Vfe - I was aghast to see that the top of the white arc on the plane was
not the stated 100mph, but 120mph. So that was changed to 87kts
(or 100mph)
I confess to being confused by the "Blue Line" and the Yellow Arc values.
1) I only know of "Blue Line" in multi-engine ops - Vyse.
- Besides which I don't have a blue line marking on my airspeed indicator.
2) I'm trying to differentiate between the "Yellow Arc" in this table and the
"Blue Line". I'm figuring that "Blue Line" means Va (142mph) and the
Yellow Arc runs from Vno to Vne (193mph to 230mph).
Is that the correct interpretation?
If so then I need to placard 123kts (142mph)for Va (no full control deflection),
and set the EFIS yellow arc for 168-200kts (193-230 mph).
Presently my yellow arc starts at 180mph. I have no idea where that number came from. It's conservative from the standpoint of Vno so it's value doesn't scare me like the Vfe value did.
So I learned a lesson in taking settings for granted.
Or maybe I'm misinterpreting these values in which case correction is appreciated.
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