Originally Posted by 121TaxiDriver

First time poster and long time reader.

Question on V1

I understand how V1 is calculated and the factors affecting balanced field length (i.e. mass and thrust available). However, I'm unable to determine for certain whether or not wet or contaminated runway and shorter runway affects V1 if at all.

Wet or contaminated runway?
decreases v1 due to rebalancing of balanced field length (higher accelerate go distance and lower accelerate stop distance)

Shorter runway?
decrease V1-weight restricted and field limited

Any help is appreciated Also, any links to an approved vendor explaining the reasons would be appreciated.