FMS T-28 Speed Tests With 4,5 & 6 Cell Batteries on 01-06-20

The FMS 1400mm T-28 can be flown on a 4s, a 5s, or a 6s battery without any changes to the prop or other mods...Just swap the battery and go fly.
I wanted to get some speed measurements using each battery size. All were 2700mAh for each of the different cell counts, to help normalize the test. In addition, all measurements were in level flight only, with two passes. (one in each direction.)
There is a very noticeable difference between the 4s and 5s battery. The 4s just gives a stable and scale flight, but the 5s makes it much more fun to fly.
The 6s is thicker, and makes the canopy not want to close all the way. I think if you plan to use a 6s, you will need to find a smaller battery or plan on modifying the canopy to let it fit better.
In summary, I think my sweet spot on this model is the 5s battery. Plenty of power, and no mods needed to get it to fit.