Just kinda a showcase video to show what is possible if cost was not a factor. Total weight ready to fly is 91lbs and I weigh 180lbs so AUW is 271lbs.
11 Likes
Nice video, as always !
I’m curious to hear more about this new power pack. Do you have any more informations you could share yet ?
As for the propeller spacer, it helps a bit on the consumption (I’m using a 110mm spacer). However the biggest advantage is for me the lower noise (the prop hits a bit less the cage/spars turbulence, and is further away from the pilot’s hears)
Ya, this is something I have tested a bit but I want to get some more empirical data on the efficiency differences vs distance back. The new power pack has some changes to the motor to be lighter weight, along with that there is a new ESC and hand controller design. With those and some other changes, it will allow BMS and more ESC data shown on the hand controller. We will show all the details once its released.
1 Like
well done, congratulations, now some people in Europe have a requirement to be able to fly this long. Every sport and technical development depends on there being goals that one wants to achieve. I think in 2025 there will be more activity at eppg worldwide. I will also be flying more again 
1 Like
Im in Europe, and the flight time on standard 4.8kw battery is fine for me. The only problem right now is battery cost, OpenPPG powerpack alone is same price as complete unit with Moster 185…I roughly wanted to estimate cost of DIY battery pack but it wont be that much cheaper, in Europe at least. someday I really want to get nice PG wing with electric motor, ultimate combo for flying low and slow.
I have been building all my own batteries for many years. The cells are currently very cheap in my opinion.
As an example, 200 pieces cost less than 700 euros. With 200 pieces you can fly for a very long time. Samsung INR21700-50S 5000mAh - 35A - 21700 & 20700 - Li-ion - Wiederaufladbare Batterien | NKON
3 Likes
I estimated the cost considering Molicel P42B (or maybe p42A), same cells used for older OpenPPG battery pack. I did it because I dont know much about building battery packs, at least yet. This Samsung looks very interesting, price would be very good for me. Maybe stupid question but what Kw (size/capacity) battery I would build using 200 cells? What kind of flight time I should expect? Merry Christmas
With 192 pcs Samsung T3 21700 4000mA cells thats 24s8p I got 30min with a very lifty ENA wing and very lifty 69kg body 
And this at small power levels like 3.8kwh for level and 5-6kwh climbs.
The 24s8p is 2.8kwh, so about 2.2kwh useful capacity.
At an average power need of let’s say 4.5kwh (the average between level and climb power) it makes sense that having half of that like 2.2kwh will be able to fly half an hour. But that’s just my math, might be wrong as I’m a begginer.
Now with an 30Ah 2.66kwh (24 Ah/2.1kwh useful capacity/power) I also get 30min flight, but a very soft flight, mostly low altitude and no climbs. Batt gets down to 82v under power, that’s when I land.
You can take it from here and sort it out with other cells but I see it gets down to your usefull capacity and the average power you consume.
1 Like
For example, if I fly with 195 cells in a 15 S 13 P with 5000 mAh per cell, I get flight times of 35-40 minutes as an 85 kg pilot with an EN B wing of 29 m2. Propeller three-blade 140 cm. With a modern full reflex wing of 26 m2, I get about 45 minutes. I consider that a “long flight time” for normal after-work flights and sufficient for many pilots. If you use more cells, an hour is no problem. I just wanted to say that if you build the battery yourself, the prices for the cells are currently very low.
2 Likes
Maybe chime in over here and give some details of your opion on buiding today.
Is a DIY pack cost effective today
Cheers
1 Like