lepton 4s kora 15-14 disappointment

[avatar71]

well, I have a bunch of flights on my lepton with the fp 3700 4s packs and I really am not to impressed.

I am using the smaller of the two included pinions with the kit and the ship only hits about 2200 hs and it bogs out on climbs and tictocs.

I thought this was supposed to be a rocket. Any tips out there? I would assume that the bigger pinion will up my headspeed but won't that affect my torque to the blades and worsen the bogging climbout?

Funny I used the hs calculator at readyheli and it figured my hs at way over 2000 almost 3K. not happening...

[Gus]

I would look at your ESC and throttle curve.

With my Kora 15-14W & Jazz 80-6-18 & 24t Pinion, I get 2800 rpm at the head with 90% throttle on the 4s pack.

That is tached with 2 tachs and the MicroPower recording the Head Speed.

Gus...

[avatar71]

same esc, throttle all above 90. I'll check again.

[t-rexn8]

Dang I just baught that combo.
Please keep us updated.
Gus how is yours running?
Lots of power?

[avatar71]

is there a way I could have mis-programmed the Jazz? It seemed pretty simple to set up for helis...

[Gus]

I Program mine for mode 4 Heli Mode, Mode 7 (If necessary), and Mode 9 Lipo Mode.

I run Throttle on Channel 1 (Futaba) (Throttle channel for JR & DX7)
Normal Mode Throttle Curve: 0-45-90-90-90
Mode 1 & 2 Throttle Curve: 90-90-90-90-90
Normal Mode Pitch Curve: 30-40-50-75-100
Mode 1 & 2 Pitch Curve: 0-25-50-75-100
Throttle Hold Pitch Curve: 30-40-50-75-100

I generally move throttle to half and let it spool up, then switch to mode 1 for flying.
Gus...

[HeliLover]

I too will be running this combo, but i opted to fly it with 5S, i believe that this is what i have seen and decided for the 5S, hopefully u can figure it all out though, cause i have heard that with 4S it still is pretty darn fast....Ivan!

[Jafa]

What's the smaller of the two pinions?
The Kora needs the 24T

I have the Kora 15-14, FP 3700 4S 20C, Jazz 55 ESC
This setup works absolutely fine - heaps of power
It's my most powerful heli (I have 90's also)

Normal mode throttle 0 55 55 55 55
Idle up 80 80 80 80 80
(It's in heli/govenor mode)

When you spool up - wait for a few seconds at zero pitch
for the headspeed to kick in and the govenor to latch onto that

[avatar71]

jafa, whats your hs at 80%?

[t-rexn8]

Jafa, how about a video :lol:

[docjoe]

I have this setup and didn't like it at first. I have decreased the collective pitch to about 10 degrees and increased the cyclic and it seems a little better but still tends to bog more than my old Hyperion. I'm going to try to put this through its paces before I really decide.

[avatar71]

good to know. so its not just me...

[Jafa]

I'm getting about 2500 on the head with the 23T
That's why I want to revert back to the 24T

It does not bog on 23T and I would assume it can drive 24T fine

The engine does not get hot on 23T

I can get a video done on Sat

[avatar71]

maybe i programmed my jazz wrong...

[docjoe]

I've been flying this more and unfortunately, I have to be very gentle with the collective management or else I'll lose tail authority due to decreased head speed from bogging. Even my 6S TRex 600 has more power than this. Come to think of it, my Hyperion 3025-10T was similar to this Kora. I am getting used to flying it more and am starting to appreciate the heli again, for its own characteristics.

For me, I'd like more power from this heli but am learning to adapt my flying style to it. No stick banging...Darn!

[avatar71]

I can understand what you mean but, I was under the impression that the lepton was a 90 heli miniaturized... i think the kora was a bad choice for 4s and better suited for 5s.

Anyone suggest a better motor? a 15-12 perhaps? I am not going to buy new batteries.

[ckoelliker]

I like the hyperion 10 turn on 4s. I run a 23 tooth at 100%. I get right at 3000 rpm. It has a lot of raw power. I do think a lot of the tail issues are because the gearing is only 4 to 1. I wish someone would make an after market auto gear that would speed up the tail a little bit.

[t-rexn8]

Remind me again why I baught a Lepton??? :dontknow

[eheliflyer]

I can understand what you mean but, I was under the impression that the lepton was a 90 heli miniaturized... i think the kora was a bad choice for 4s and better suited for 5s.

Anyone suggest a better motor? a 15-12 perhaps? I am not going to buy new batteries.

Have you checked you lipos? Are all 4S working? I have seen this setup and it has tons of power.

[eheliflyer]

Remind me again why I baught a Lepton??? :dontknow

Because the power to weight ratio is awesome! :glasses2:

[t-rexn8]

Thats what I thought too. I am almost ready to fly mine and break in some packs. After I saw this I wondered if I had the wrong powerhouse motor.

[Jafa]

The Kora has more than adequate power on 4S - no doubt about it
I have absolutely no bogging at all and it rips

I just need to change the pinion to get the HS up a bit
because when I had the Hyperion motor on 24T
it was even more powerful and had striking cyclics

But even now, I have to exercise careful collective management
because it has so much collective power
(easy to turn a roll into a cork screw)
and if I get a fright flying inverted
I can simply hit full aileron at zero collective
and BANG she is over and upright


I have to be very gentle with the collective management
or else I'll lose tail authority due to decreased head speed from bogging.

Sorry - but there is something very wrong with your setup
The has been a few times when I have washed headspeed off
but I've never actually managed to get an ugly bog out of the Lepton

You're not using the Hirobo tail blades are you?
They are completely a waste of time
You need longer tail blades
Eolo tails or Viper tails or ReadyHeli tails

[avatar71]

both packs are fine. all 4s being used.

with the readyheli tail blades I was getting wag and just plain sloppy flight with a 9650 servo. The 9252 really helped that though.

if i change pinions, the hs will drop.

i remember someone posting that they thought their kora was mislabeled. after all, they just write on them with a sharpie. I wonder if I got a 15-16 or something. There is just too much inconsistency here

[Jafa]

If you could get your hands on a loaner Hyperion that would be a great back to back test - if the Hyperion does not light up then it would be an issue with something else on your Lepton

We have 6 Leptons here and they are all running 4S with heaps of power

[avatar71]

jafa, are you running the 14 turn kora's?