I got the dual tail motor assembly all installed and working. It was very easy to do once I got the stock tail off
With this setup, I have to put my TP 1320 lipo as far forward as the canopy will allow before it will balance. I started to remove it, and shorten the tail boom a bit, but decided not to. I am planning to get a CNC head unit soon, and it is a little heavier than stock. If it is still hard to balance once I get the CNC head on it, I will trim down the boom at that time...
I took it out and hovered it for 10 minutes straight after a few adjustments to the proportional pot on the 4 in 1. This tail has easily twice the 'holding power' of a stock, single motor. The difference is amazing. Also, after about 10 mins, the tail motors were only a little warm to the touch
When I first tried to fly it, I found that I had to push the rudder trim full left, and still hold about 1/4 left rudder stick to hold the tail in one place. I had to crank the pot about 1/4 turn counter clockwise to get it to fly with the trim centered. This is presumably because the tail is much more powerful now, so less input is needed in the mix.
So, my first impression is a big ol' thumbs up for this mod! I will post again after I've had the chance to spend some quality time with it...
I took a few quick pics of it. You will probably notice that I also added a 3a fuse to the tail motors. I also added a 7.5a fuse to the main motor, but you can't see it in these pics obviously. They should save the 4 in 1 if things go badly