Gusts and stalling

[Former Member]

[This posting has been removed]

[Tom Wright 2]

The high alpha capabilities of a delta are indeed very apparent Eric " we have a couple of 363s" The question that springs to mind concerns the airflow over the wing top surface ....is it stalled or does the delta wing allow a higher AOA before significant detachment occurs?

If the thrust available is greater than the AUW ,and airflow from the prop is sufficient to create control input reactions does this mean a model with a stalled wing can still be kept aloft ?

This now sounds like 3D territory or a guided missile ,

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

[John Olsen 1]

I beleive that deltas in this condition are in fact stalled, as evidenced by the increase in drag past the stall angle. This requires extra thrust to maintain flying speed. But with low aspect ratio wings, although the drag will increase dramaticly beyond stall, the lift does not decrease anything like as dramaticly as with a normal wing.

 

3D models are in a strange mode. When they are hovering, the pedantic might argue that the outer panels are not in fact stalled since there is no airflow over them and therefore there is no angle of attack. At the same time the inner panels do have significant airflow from the prop so would not be stalled. They might also not be producing lift, eg zero angle of attack for a symmetrical section. But I would expect that there are times in 3D flight when parts of the wing are in fact stalled. This does not matter so long the controls have sufficient authority and the pilot has the skill to know what to do to maintain control.

 

regards

John

[Tom Wright 2]

 

Precisely my thoughts John ,thank you for the accurate interpretation of my post.

 

Regards

Tom.