Couple of quick TW-5 questions

[bert]

It's been a few years now, but wasn't that part of the prop sleeve impact fix?

 

[Gatordev]

The prop cares. No idea why they didn't just program it to maintain 80% to a lower altitude.

Interesting. I wonder what causes the stress (different aerodynamics from the airframe, bigger prop/more blades, etc).

 

[Pags]

I live on the Bayou by Pensacola International... heheh.... I see and hear you guys going PA's from time to time. Cool stuff to watch with a beverage in my hand and gut, and sitting on the outdoor recliner...

While you call in noise complaints?

...too soon?

 

[Planeform]

Interesting. I wonder what causes the stress (different aerodynamics from the airframe, bigger prop/more blades, etc).

Something to do with stress on the prop blade with the prop's AOA during a stall/spin and air density below 10,000ft coupled with the prop tip breaking the sound barrier results in stress and vibration that might break the blade.

 

[wlawr005]

Doubt it. We spin with the PCL at idle. The PMU actually speeds up the blades to maintain the 80% Np (its usually around 48% at idle).

 

[Swanee]

So black magic makes the airplane do bad stuff if it spins below 10K. Roger that.

 

[BUDU]

And if it spins to the right, if I'm not mistaken.

 

[VmiMMXI]

And if it spins to the right, if I'm not mistaken.

You can spin both left and right. I did both in contacts.

 

[MIDNJAC]

Unless the PA's are in Hornets, at 0400, I am fine with it...

I'm going to for sure shoot a PA at 0400 @ PNS next time I'm down there. Some might say...."hey MIDNJAC, there is no such thing as a PA for the Hornet".......that's fine, but I'm sure it would probably involve being in full blower on the good motor the entire time

 

[BUDU]

You can spin both left and right. I did both in contacts.

Huh. We were told in ground school that it does something weird to oil pressure.

 

[Recovering LSO]

I see and hear you guys going PA's from time to time..

?

 

[jtmedli]

Huh. We were told in ground school that it does something weird to oil pressure.

It may be an Alpha thing. In the Bravo, spinning to the right is fair game.

 

[wlawr005]

Interesting. I wonder what causes the stress (different aerodynamics from the airframe, bigger prop/more blades, etc).

Additionally, while not prop related...the book says 2-3 turns per second at 4-500' lost per turn. In a full spin, that's 10k/min descent rate. Never heard it mentioned, but staying above 10k keeps you in the "minute to live" window.

 

[Gatordev]

Additionally, while not prop related...the book says 2-3 turns per second at 4-500' lost per turn. In a full spin, that's 10k/min descent rate. Never heard it mentioned, but staying above 10k keeps you in the "minute to live" window.

I don't remember what the foot/rev was in the T-34, but it had a 7K-9K FPM spin rate, so you were always inside the minute to live envelope during Fams. High spins/spirals (which the studs didn't do) I was more concerned with, especially with multiple cases of guys not getting out of a progressive spin right away and getting read to blow the canopy (or worse, in Corpus).

 

[wlawr005]

I didn't figure it was that big of a concern and that the T-34 was probably pretty similar.