You know where you are today... measured in membership, post counts, visits, unique IP's, etc... but where do you want to be? Next year? 2 years? I assume you guys are constantly working on SEO strategies to attract truly new members... what else is happening behind the scenes?
How can you work with key regional clubs to help sponsor fly-in events? I don't think clubs want to make a ton of money on these things, and I know some clubs are burned by LOSING money because the folks at the other site took their cut off the top. Just identify 6 or 8 large regional events this season where you think some visibility will pay off in membership, then either attend or find someone in the area who will represent you at these events. You don't want a tabletop presence if the competition is putting up a 50 foot tent, but you should be able to identify some key GIANT SCALE events for some ground level marketing.
How's the multi-rotor site going? Any opportunity to combine limited resources and support both at the events?
How did the new member raffle earlier work towards attracting new members? Can you work through any of the big online retailers to offer a gift certificate raffle? Could you spend, say $500 , to get Horizon, Tower, Chief, TroyBuilt, or one of the aircraft manufacturers to post a banner ad for a $500 gift certificate, and have the people register here at GSN for the raffle? That would take advantage of their existing traffic and word of mouth to drive traffic to both sites.