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Low Head Speed Helicopters Low Head Speed Helicopter Setups and Flying info


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Old 05-12-2021, 07:02 PM   #1 (permalink)
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Default Optimizing Logo 600SE

I have a Logo 600SE (VTX 697 blades) and am running 1400 and 1600 pretty well for big sky sport flying. And now I am trying to get the optimal combination of motor/gearing to cover that range; here is what I have now:

HKIV-4035-450 (3330 watts), 11t pinion, max HS=2073, flying
@ 78% for 1617rpm

Here is what I think would work better; ie give me longer flight time and same rpms 1400/1600. 8min @ 1600, [email protected]

HKIV-4035-330 (2664 watts), 13t pinion, max HS=1797, flying @ 90% for 1617rpm

Will that work and will the drop in max watts be a problem. The -450 has no lack of power at all.

Comments are welcome,

Regards,
Thom
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Old 05-14-2021, 03:26 AM   #2 (permalink)
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How many cells are you running? I used the same 330kv motor on mine with 12S 4000mah on a 11T pinion, at 1200rpm I was flying for 15 minutes, at 1400rpm it was about 12 minutes, everything ran cool, the motor was warm but if you look at the windings its completely packed.

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Old 05-14-2021, 11:57 AM   #3 (permalink)
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Default Lipos

I am running GensAce 3300 6sX2 = 12s
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Old 05-19-2021, 12:37 PM   #4 (permalink)
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I like my SE best on 6S. Currently I have a 610kv motor but your 450 would work with a larger pinion.
Try a 15 tooth and run your 3300's in parallel instead for a 6S/6600 pack
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Old 05-20-2021, 03:08 PM   #5 (permalink)
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My SE was running a 700-45 with 13 pinion.
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Old 06-13-2021, 06:04 PM   #6 (permalink)
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Scott got me to try my 600SE on 6S, and I've not gone back. Running HKIII 4035-560, 12t and 6S5000. I don't have telemetry. I fly for 7 mins and come down at about 3.8v/cell. No shortage of power and pop. I fly mostly around 1350-1400. Rotortech 690 mains, and RT116 tail blades. It's a magical combo that seems to be very snappy and smooth at the same time. What I love most about this machine is that it's confidence-inspiring, and less intimidating to bring it in close and do mild, smooth 3D low and near. Scott said at one time, "best single-pack heli he'd flown". I am right there too!

I did have to change ESC and servos during the off-season, as my old Futaba BLS253's and the BLS251 were starting to screech. I changed out the Jive so I could move to an ESC with HV SBEC. So, I wound up moving to KST's and a HW120V4. Still loving it.
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Old 06-14-2021, 11:45 AM   #7 (permalink)
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Quote:
Originally Posted by Rob43 View Post
Scott got me to try my 600SE on 6S, and I've not gone back. Running HKIII 4035-560, 12t and 6S5000. I don't have telemetry. I fly for 7 mins and come down at about 3.8v/cell. No shortage of power and pop. I fly mostly around 1350-1400. Rotortech 690 mains, and RT116 tail blades. It's a magical combo that seems to be very snappy and smooth at the same time.
You should try the RT-700U on this heli. Sounds like a perfect use case.
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Old 06-14-2021, 09:24 PM   #8 (permalink)
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Quote:
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You should try the RT-700U on this heli. Sounds like a perfect use case.
You can safely run 700s on the SE?
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Old 06-17-2021, 08:25 AM   #9 (permalink)
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Well, I did run my 700U blades on it as a matter of fact. I would have needed to spend some time to tune the FBL settings to suit my feel, but it wasn't something that I could tell right away that I would like. And, I have too little time to fly to spend it all adjusting to blades. I was happy to put the standard RT690 blades back on and recover the pop I felt before.

I had a similar experience trying the RT610U's on my Logo 600SX. I had a noticeable loss of collective pop. This wasn't low speed, but more normal speed between 1800 and 2000 rpm. This was coming from an old, but like-new set of Edge SE603's that I've always flown on that model.
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Old 06-25-2021, 06:37 AM   #10 (permalink)
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Quote:
Originally Posted by Rob43 View Post
Well, I did run my 700U blades on it as a matter of fact. I would have needed to spend some time to tune the FBL settings to suit my feel, but it wasn't something that I could tell right away that I would like. And, I have too little time to fly to spend it all adjusting to blades. I was happy to put the standard RT690 blades back on and recover the pop I felt before.

I had a similar experience trying the RT610U's on my Logo 600SX. I had a noticeable loss of collective pop. This wasn't low speed, but more normal speed between 1800 and 2000 rpm. This was coming from an old, but like-new set of Edge SE603's that I've always flown on that model.
Yeah, that's pretty much impossible. The only way this can happen is if you have servos that are borderline overloaded with the previous blade and unable to produce the torque needed to move the wider blade into position quick enough.

The RT-610U is 4mm wider and 7mm longer than the LE-603SE and has a way better airfoil in terms of lifting performance. There is no way it has less collective pop.

Similarly for the RT-700U vs RT-690. The 700U is 10mm longer and 1.5mm wider. I can tell you from experience that the 700U is a way stronger blade than the 690 as I've flown them back to back many times. No way it has less pop.

You may be falling victim to placebo and imagining these things based on the audio signature of the blades, as the wider blades will be quieter and sound way less harsh on large collective inputs as they're operating at a lower AOA for the same thrust. That's the only way, besides weak servos, I can see that happening.

Last edited by Johnny31297; 06-25-2021 at 06:49 AM..
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Old 07-10-2021, 08:21 AM   #11 (permalink)
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Okay. Fair enough. Didn't make sense to me either. I wouldn't have considered my servos weak though. They are KST BLS815 V2 on 8.4v. I will say they don't have the same precise feel of the former Futaba BLS253's that I used to fly in this heli, however. But they were the old LV ones powered at 5.6v from the Jive bec. The KST's are on the HW120 bec. Sorry didn't mean to hijack the thread...
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Last edited by Rob43; 07-10-2021 at 08:59 PM..
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