Are the M20C/D's legal to fly under MOSAIC

[hammdo]

My AI buddy says 

 

“58 KCAS

(67 MPH × 0.868976 = 58.22 knots; IAS ≈ CAS at low speeds, rounded to whole knot per aviation convention”

 

Edited 4 hours ago by Jackk

 

[PT20J]

Interesting. I often find that AI gets things exactly backwards. Recently, it correctly answered a question but then went on and eventually contradicted itself. 

[cliffy]

MAYBE the factory can dig into the certification records and come up with an IAS correction factor at the low airspeeds 

to compute a calibrated airspeed for the stall?   I'm sure its model and airspeed dependent. 

Might be worth a try.

AI ain't as good as many think it is especially in technical matters. 

[ptwffz]

1 hour ago, hammdo said:

 

My AI buddy says 

 

“58 KCAS

(67 MPH × 0.868976 = 58.22 knots; IAS ≈ CAS at low speeds, rounded to whole knot per aviation convention”

 

Edited 4 hours ago by Jackk

 

Makes sense if IAS = CAS at low speeds. 

[PT20J]

1 hour ago, ptwffz said:

Makes sense if IAS = CAS at low speeds. 

The problem, as we may recall from private pilot ground school, is that that the largest airspeed errors (spread between IAS and CAS) usually occur at low airspeeds because the pitot tube is no longer aligned with the relative wind due to the increased angle of attack.

[Hank]

9 minutes ago, PT20J said:

The problem, as we may recall from private pilot ground school, is that that the largest airspeed errors (spread between IAS and CAS) usually occur at low airspeeds because the pitot tube is no longer aligned with the relative wind due to the increased angle of attack.

Then how do you explain THIS: 

Power Off CAS = IAS - 1 at low speeds, climbing ti IAS - 3 at higher speeds.

[ptwffz]

40 minutes ago, Hank said:

Then how do you explain THIS: 

Power Off CAS = IAS - 1 at low speeds, climbing ti IAS - 3 at higher speeds.

All I'm gonna say is I wish that chart was in my Owners Manual.  I'd be golden. 

[PT20J]

18 hours ago, Hank said:

Then how do you explain THIS: 

Power Off CAS = IAS - 1 at low speeds, climbing ti IAS - 3 at higher speeds.

Well, I did sat usually .

And, usually, if there are errors, manufacturers try to get it minimized at cruising speeds because that's rally where we care about absolute speeds. At the low end it doesn't really matter what the calibrated airspeed is since we fly by indicated airspeed.

Mooney evidently did a good job locating the pitot tube. It's not simple because the upwash ahead of the wing changes with angle of attack. That's why test aircraft often have that long probe out ahead of the airplane so as to place it in the free stream relative wind.

[Paul Thomas]

The FAA wrote on the subject; it needs to meet the requirements since certification and it needs CAS from the manufacturer. If the manufacturer had not done CAS testing, the manufacturer can do new testing. IAS is not acceptable as it can be off by more than 5 knots.

[varlajo]

17 hours ago, ptwffz said:

All I'm gonna say is I wish that chart was in my Owners Manual.  I'd be golden. 

My E is 1 - ONE - mph CAS over MOSAIC cutoff 

[ptwffz]

[ptwffz]

The above airspeed indicator was copied from a different post. The owner states it's from his M20 D/C model which is exatly mine. Granted I don't know his year but there's a big difference in his VSo and VS1. Both way lower than mine. What the !!!!!!!!!

[ptwffz]

This is my airspeed indicator. It looks like someone placed black tape over the bottom of the green arc. Like I said, maybe the other airspeed indicator shoud be in my bird. Is my Owners Manual incorrect? I have a 1964 M20D Master and my manual says 1965. I doubt it changed by one year. Nothing is making sence here. Or I'm retarted. 

[ptwffz]

I just noticed the top of my white arc is taped over as well.

[Hank]

For my 1970 C, the Owners Manual says the green stripe is "the normal operating range" and makes no mention of stall.

You really need something like the table I posted before, but for a model year closer to yours, since control throws changed over the years.