Dennis Adamisin and I have had some very interesting chats regarding some potential uses for 2-cell 4200mah Li-ion packs. With an appropriately high KV motor, like 1800-2000Kv, a 2s4200 pack could make a really neat, lightweight combo for airplanes around 24-32 oz range
-ish. ie, all those Ringmaster, Flite Streak, Skyray, Corehouse streak RST, Shoestring, ect. sized planes. Dennis mentioned that this could allow him to: (1.) lose nose and tail weight to arrive around a 24oz goal weight for his Ringmaster, (2.)to spin a 9x6 type prop,
and, (3.)it should not tax that large capacity 2s/4200mah battery too hard in the process. Sounds pretty compelling to me!
The Tempest 2217/1950kv, a 9x6 or cut down 10x6 and a Talon 35 esc seem like a pretty good package for the 2S experiment. Running that 2217/1950kv Tempest motor at 7.4v at 75% or so would still allow 10.8k on paper. Should have plenty of headroom. That Tempest 2217 motor lists 340w max @ 2S, which should be more than plenty for a 24-28oz flying weight.
If more a more powerful motor is needed for larger or heavier airplanes in the 29-33oz range, the BadAss 2320-1860Kv (3.26 oz.) boasts 407watts on 2 cells for a weight gain of only .7oz.
The weight for that 2217 combo should be around 9oz, minus prop and spinner.
- 2s/4200 Li-ion battery: 5.4oz (estimated)
- Tempest 2217-1950Kv: 2.54oz
- Talon 35 Esc: 1oz
https://innov8tivedesigns.com/tempest-2217-1950kv-brushless-motor.htmlhttps://innov8tivedesigns.com/badass-2320-1860kv-brushless-motor.html(With as deep as you can take Molicel P42a 4200's into the discharge curve, I think that you potentially could use one of these packs clear up to around 40oz. On paper it works out. Actual results on the plane are yet to be determined.)