I'm fairly new to VAF, so wasn't around back when either the RV-7(A) or RV-9(A) kits came out. I was reading some history on Vans website and learned that the RV-7 came into being approximately 4 years after the RV-9. So here's my question, and this is NOT intended to be a "which is better RV-7 vs RV-9" debate. In the 4 year span between the two models, what did Vans Aircraft learn from the RV-9 that they made improvements on with the RV-7? The obvious wing design is not the type of change I'm talking about, because that's not an issue of "better", as much as it's just different. One could argue that Vans makes improvements with every new aircraft, but since the RV-7 and RV-9 are so similar and came out back-to-back, I'd like to know what improvements were made in the 7 compared to the 9.