Originally Posted by
Morrisman1
Id be surprised, there is a strong pitch forward at the stall int eh PA28-181, I am under the belief that to flat spin you would have to have at least a neutral pitching moment at the stall.
I may be wrong because I've only done stalls in the PA28-181 with the two rear seats empty
Any significant tendency towards an unrecoverable spin would have prevented certification at-all. The issue is, I think, simply that Piper didn't feel it necessary to do the significant extra work (and attract the significant extra product liability) if the aeroplane was certified for deliberate spinning.
Answering an earlier question, in the early 1970s, Piper switched from a straight wing to a tapered wing on the PA28. The tapered wing aircraft (-161, -181, -200R...) have a virtually zero incidence of stall related fatal accidents; the older straight wing aeroplanes (-140, -150, -160, -180...) have a good, but not a zero rate of stall related fatal accidents.
There were other changes at the same time (such as a shift from a visual to an audio stall warner) so the wing itself may, or may not, be the reason for this change.
G