Side force stability sign convention clarification

[Alan Duong]

Hello,

I'm running a stability analysis to calculate the stability derivatives and have run into something that is unexpected. 

For reference, my aircraft has a symmetric vertical tail that is set to 0 degree deflection as the base. 

When I run the stability calculation, my CS_beta value is positive. This is indicative of a positive side force. However, it is my understanding that positive sideslip is comes from the right to left (if you look at the aircraft top-down, positive y going out to the right wing). 

My question is, why am I seeing a positive CS_beta value, I would expect to see negative CS_beta values. 

Is there a sign convention that I am not aware of or how vsp handles the calculations?

Best,

Alan

[woeile...@gmail.com]

Exactly the same problem I am running into. I don't have the answer, but I am leaving a comment here to keep myself notified just in case if someone has answer.

aland...@gmail.com 在 2020年4月13日 星期一下午9:09:30 [UTC+8] 的信中寫道：