these are just reports of pros and cons of quality and engineering.
NOT BASED ON ACTUAL FLIGHT REPORT!!!
Two helis uses same elec. equipment, but the actual size of the heli is very different. L400 is substantially bigger in retrospect than the protos. Protos is about in the middle of Trx450 and Logo 400. Its about 1.5inch shorter. Im assuming the pwr to weight ratio on protos will win hands down although I have actually flown the protos yet. Well here goes,,,
Build quality: Protos. Althought L400 is also excellant, the protos was slightly better in quality and parts fit. Parts fit like magic w/o any frustration. Only thing I had an issue was the tail ball link was too stiff. I later found out that this was done on purpose to let the pilot adjust them w/ given ball link enlarger. I guess its better to make them tight then loose in the beginning.
Design/Engineering: This is very very similar. Logo 400 is based on L10 so the design might be old compared to protos. Both have pros and cons, but I like the single belt design of the protos. No more messing w/ backlash between motor/gear and boom/gear which is on the L400..
Durability: L400 seems more durable just from the visual aspect. Protos seem to be brittle in a crash where as L400 might give a bit.
Part quality: Protos by slight margin. I have the plastic frame on the protos, which is an understatement. Frame is made of plastic and carbon fusion. Very stiff, but brittle. I know this since I used to race RC cars and many were of this type.
is that a new heli? Oh no honey, its the same one w/different stickers.....