I don't know the specifics of the algorithm that HN uses, but reddit used to factor in 'post velocity'. Assuming HN does something similar then a relatively sm

I don't know the specifics of the algorithm that HN uses, but reddit used to factor in 'post velocity'. Assuming HN does something similar then a relatively small number of quick early upvotes can send something to the front page. A more mixed response from front page only viewers will send it crashing down.