F Model

[Voodoodb]

I have heard and read where people refer to the F model as "twisted wing", Is this a specific year F, or were all F's built with the washout? And anyone know why Mooney did it?

[Browncbr1]

I have a 67 F with washout.  They only did it one year, 67.   I don’t think it matters and if anything may slow cruise slightly.   I bought the 67 for the jbar.  I would prefer not to have the twisted wing actually.  
 

i think they did it to help low speed handling and make the stall break more gradual, but in the real world it doesn’t really matter. 

Edited April 20, 2022 by Browncbr1

[carusoam]

What Mr. Brown said…

It was a good idea, but…

To make it work requires a larger change of airfoil…

So… the cost benefit wasn’t there…

The cost was a slightly slower cruise…

Best regards,

-a-

[Shadrach]

I’ve heard it slows cruise but I’ve seen no evidence that my 67 is slower than any other F model. There were a few F model made in 66 and I believe they also had the twist which ceased for 1968. I think the real cost was in manufacturing. Most wings have some washout , this is a very obvious but gradual decrease in angle of incidence starting just outside  half span and going to the tip. I would think made manufacturing more complex, expensive and time consuming with little benefit; all things Mooney could do without in 1968.

Edited April 22, 2022 by Shadrach

[A64Pilot]

You can accomplish washout several ways, aircraft I built had 1.5 degree washout, we did not change the airfoil but some do, you can increase camber on the inner wing, droop flaps for example to washout, or you can change airfoils with out twist and washout.

Washing out is less efficient, but arguably safer, what your trying to prevent of course is a tip stall, normal stalls start inboard and are usually recoverable even at pattern altitudes, tips stalls often result in a spin, which isn’t likely to be recoverable at pattern altitude.

Some airfoils have very gentle stalls, others not so much, often more efficient as in lower drag airfoils have poorer stall behavior.

I’m certain my Mooney anyway has washout, just I guess some have more, washout is built into the jig, there should be no more work or time required to manufacture a wing with more or less washout once the jig is changed, but changing the jig is no minor thing.

[W6k]

My F has the twisted wing. I wanted to add some nice inclosed wing tips offered by lasar but they wont fit.

[MoonFlyer68]

16 hours ago, W6k said:

My F has the twisted wing. I wanted to add some nice inclosed wing tips offered by lasar but they wont fit.

What wigtips did you buy and if they don't fit are you looking to sell them? Depending on what they are, I might be interested.

[M20F]

My 67F is 140kts in any direction.  

[DCarlton]