So to carry 3lbs+ of gear AND fly very slowly for filming you are looking at a - BIG - 28lb+ plane... and I'm being optimistic.

It doesn't sound like you want a fast plane, you want a plane capable of slow flight to get the shots and the be able to keep a camera aimed at a spot, or a moving target.

Unless you are zooming around at way over 60mph, a plane capable of flying over 50mph should suffice.

I'll bet that the slow flight characteristics are what will be most important to you... as we've found with our attempts.

Slow, vibration free, etc.

Too bad you couldn't use something like a FlyCamOne version 2 mounted on a servo controlled gimbal, as this would give you a wide range of small planes to use...

As it is, to me it seems that your criteria is going to dicate a BIG plane...