Busy times… The pepperF1SH for the world tour is more or less ready, I am just waiting for the batteries to arrive. Openground gets a new low level driver library, which by the way seems to reduce the flash usage to one half of the old one… Ah and by the way I started to work on a 1-2S version of my tinyPEPPER ESC for my pepperF1SH copter ;D So there will soon be a:
The first tinyPEPPER2 prototypes are soldered and beside some minor fixable layout issues seem to work just fine. I did some first tests with the ladybird 56mm props: On 1S I get 26g of thrust at 1.5A (a bit better than the previous design which got 23.6g at 1.6A). And now hold on tight, at 2S (8.4V) I get ridiculous 72g of thrust at whopping 3.9A for the 56mm propellers… Keep in mind those are early numbers, I did only short test runs so far. The ESC will be the same size as before (16x16mm hole spacing, 20x20mm total) and probably weight 0.4g more than my 1S tinyPEPPER version.
If all works out as expected I might end up with a 36g copter (AUW, of course with 2S batteries and cam/vtx) with a total thrust of 288g. Or, in other words a theoretical thrust to weight ratio of 8:1 (!) Sounds ridiculous but good 😀
At least that is what I thought and wrote into the draft version of this post before I did the maiden … Well… Let’s say I doubt I can fly this indoor… This is really insane. It looks like half throttle, which pepperF1SH was hovering at, equals the max thrust of the 1S version… Hmm I think I have overdone it this time. But hey, summer is coming, this might be perfect for outdoor racing. Is it allowed to compete with a 36g copter on a 250g class race??
Now to something different: My experience with the first tinyPEPPER design is that there are not many people that can solder those tiny surface mounted parts. So this time I might take a different route. I have some manufacturers interested in this ESC design so I might end up selling it to one of them. I am still undecided to whom I am going to sell this design or if I will go this route at all as I really really like opensource and open hardware. On the other hand, when mass manufactured this ESC will probably cost not much more than what you end up with when you get the parts alone in single quantities — let alone your labor costs. Hard to decide…