Before you LOL, hear me out ...

My 4 inch micros all run 1100mAh 3S GNB's (stupid light at 66g) with a raw weight excluding lipo of 150g pushing 7+ min of straight line endurance flying.

If I can keep the raw weight of a 5 inch chassis to 150g, why can't I still use the same 1100mAh 3S GNBs?

I use 1404 3800KV on the 4 inch.  Although it's the same raw weight, I'd think I'd need bigger motors to spin the bigger props.  Or no?  I was thinking 190X or even 200X at lower KV of 25XX-ish?  Or am I completely off the mark here?

Alternatively, I can just forget the whole 3S idea and wait for those stupid light 1100mAh GNB 4S's to come out (87g) which I think I can still pull off sub250 with.

some used 1505 on their racerx 5inch, i believe its to small.

as bh vy2004 work on 5inch. 2203,5 tmotor might be better for 5inch leightweight, no compromises at all.
around 2500kv seems perfect, i actualy dont know a motor with nice kv rating. its different for 6s, the tmotor 2203,5 is 1500kv, wont give the best topspeed for 5inch, but seems not to low to me.

edit: you are looking for a pure 3s motor?

hugs, no as far as I can tell, no one rates motors for 3S at least not the sizes I am looking at lol. But that doesn't mean it couldn't work right?

I actually have been eyeing those VY 2004's. Do you think I can pull of 3S or really 4S is the only option? 5 inch biblades lifting 150g of raw weight before lipo. Say I get my hands on the 1100mAh 4S GNB's so approx 240g which is cutting it real tight for me.

I run 5” tri blades on 1804 3500kv with throttle limiting set to 70% for 4s - dry weight is 165g.

Given my hungover maths brain with half a coffee calculations you should be fine mate on 3s with the dry weight you’re talking about.

Thanks ph. After going back and forth on this, I think I'll just bite the bullet and up it to 4S. It's going to cut it tight but this will rely on GNB's ultralight 1100mAh 4S lipos to get sub250. I'm thinking either the VY 2004 2100KV but also eyeing those NBD Flow 2004 2450KV. I don't want to get into upper 3000KV for efficiency.

I could also go for a lower C rated 4S since those can come in well under 100g. Still cutting it tight though. Looks like a lot of it will be dependent on the frame weight ultimately.

you can do a good baseplate on a weight of 20g (buddies did that sub250g with a vista) plus a canopy of 5g, some mounts for gps, crsf... additional 5g?


2100kv might be nice.

Coolio Iglesias. So I'm thinking low 2000's KV for a 5 inch biblade long range and low 3000's KV for a 4 inch triblade freestyle both sub250 both 2004 size motors.

This makes sense to me in that my 3 inch rippers and 4 inch micro LR both shared the same size motors as well 1404 or 1408. But in that case, they also used the same KV which probably was less than optimal on the micro LR.

Thanks hugs!

You don't want to consider a smaller motor mate?

Absolutely. I'd considered 1804 and 1606 but I'm not sure the weight savings is worth it? What do you think?



I figured a bigger motor might gain more in efficiency than I lose in added weight. But that's just theory.

i got 20minutes vvery slow flying on the original hyperbola pnp (130g) on a 1050mah 4s 75c (around 100g). there is a lot room for improvements in flighttime, about battery an biblades :-) its very efficiency :-)



we got 40min flighttime on this 5inch at 150g buildweight, bh lr2004 1650kv on a 4s liion(200g)
it was way over 250g, efficiency is awesome anyway :-D
as liion drops in voltage, its more about flying 3s voltage on 1650kv than truly 4svoltage.