V speeds

[lynnRC]

I have been able to find most of the V speeds, but haven’t seen Maneuvering speed. Anyone have this for the classic?

[mmarien]

Just noticed your post. I was just starting to think about an owners handbook for the Hatz and wondering if there was one out there. I used ChatGPT to start one. It came up with these. Not sure how accurate they are.

Airspeed Limitations

Never Exceed Speed (VNE): 160 mph
Maximum Structural Cruising Speed (VNO): 120 mph
Maneuvering Speed (VA): 100 mph
Stall Speed (VS): ~50 mph (clean configuration)

It also puts the max gross weight at 1800 lbs. I though it was 1600?

I was going to use the EAA Flight Test manual. I just got the new version but haven't opened it yet.

[mmarien]

Va should be calculable. The Stalling speed increases as a multiple of the square root of the Gs being pulled.

This is how I understand it. If the stall speed for 1G is 50 mph then at 2G the stall speed will be sqrt (2) x 50 = 76.5 mph. If you were flying along at 76.5 mph and pulled the stick back hard, you will stall the wing (accelerated stall) when the load on the wing hits 2G's.

This sequence continues up to the max load the wing will carry. If your wing can only carry 4G's then the Vne would be sqrt (4) x 50 = 100 mph. If you pull back on the stick at over 100 mph the load would exceed the carrying capacity of the wing. The wing will break before it stalls.

So Va or maneuvering speed is where the wing will stall before it breaks.

There is more to it than that. The weight is involved. There is a discussion here: https://principalair.ca/article-va.htm

[lynnRC]

Thanks for the reply. I figured it was close to the Cessna 150 specs based on size. Based on these numbers, its pretty close.