ORIGINAL: Ionikios
I thought when you loose an engine and the p-factor sum was change by the loss (change in p-factor) was what produced the yaw difference along with the thrust being of center. I understand what you are saying. I didn't express it correctly, because if I loose an engine where the p-factor is working against the other engines p-factor it will be a different yaw effect loosing visa-versa. Thank You for clarifying.
What do you think p-factor is?
The reason a multi-engined plane yaws when an engine is lost is the balanced thrust/drag becomes unbalanced. Instead of the thrust being centered between the engines, where the drag is centered, it now is off center to the drag.
I am planning on 3 or 4 blade custom prop. (not blade overlap :-)
What would the design parameters be for those props? What are you planning?