📱 🚁Helicopter › Swift HS - can the Neu 1907/1.5y handle the blades?

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Home › ✈️Aircraft › 🚁Helicopter › e-Century Radikal E640 - Swift 16 NX › Swift HS - can the Neu 1907/1.5y handle the blades?

05-27-2007 12:18 AM 13 years ago

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wrathofkhan

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LA, CA - US

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Swift HS - can the Neu 1907/1.5y handle the blades?

Hello

I used to fly my Swift with Rotortech 515mm/12T/neu 1907/1.5y. The HS was around 1950 on 5S setup (12T/4000mah/20c maxamp). the motor/battery used to get slightly warm.

Currently, I am testing my Swift with Helimax 530s with same motor and 12 tooth. the flips seems quite a bit slower, and the head speed dropped to high 1800 and feel a bit sluggish ... motor/battery is slightly warmer than the rotortech set up

would like to hear from RR members if they have tried it with similar setup. i was also thinking of testing it with 13t. a bit concerned about battery consumption, but would really like a bit more headspeed.

cheers ...khan

PS i am using jazz 55-10-32, and all 5975s on cyclic. i have used a elogger, and with my style of flying, i don't get much over 800 watts.

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05-27-2007 12:54 AM 13 years ago

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Ben-T-Spindle

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Central Illinois

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For 530 or 550 blades it’s nice to have the extra power of a 1910 motor and a 6s LiPo. The 1907 will bog down a lot more but should be ok – try to keep the temperature in the 140F range. Neu motors can take up to 200F but much over 140 and they start to sag and loose their punch.

.... BTS

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05-27-2007 02:14 AM 13 years ago

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oldfart

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Vancouver, Canada

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I am pretty sure the motor can comfortably take that type of loads. You did not say what batteries (Make, mah, C rating). I would suspect they may not be able to deliver the volts under load that is required leading to a lower head speed (lower voltage x KV = lower head speed).

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05-27-2007 02:30 AM 13 years ago

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wrathofkhan

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LA, CA - US

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i have several 4000 mah 20c maxamps (i am actually finding them to be ok)

i also have a 3850 (i think) extreme TP

---------------

i am a bit puzzled. i was flying the model with 515mm, no problem. the moment i moved up to 530mm .. it seems like it is bogging (i weighed the blades, the helimax blades are a bit heavier).

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05-27-2007 03:10 AM 13 years ago

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Ronald Thomas

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Gainesville, Fl, USA

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That's why I use the Rototechs. They are lighter and are awesome for FFF and overall flying.Team MikadoUSA 480XXTreme, 550SX, 600SX, 700XXTreme, 800XXTreme!!

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05-27-2007 03:45 AM 13 years ago

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wrathofkhan

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well, the rotortech is more than twice as expensive. and since i am also trying to learn autos, helimax do hang a bit more and are more cost effective

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05-27-2007 11:24 AM 13 years ago

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Ronald Thomas

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Gainesville, Fl, USA

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I know they cost a lot more but they are worth it! I promise you, once you try them, you will not go back...RonTeam MikadoUSA 480XXTreme, 550SX, 600SX, 700XXTreme, 800XXTreme!!

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05-27-2007 01:16 PM 13 years ago

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Pistol Pete

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Seffner, FL

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Did you "re-adjust" your throtle and pitch curves?

Longer, heavier blades need to swing slower and perhaps not your issue BUT also need less pitch for lift...which could be your cure.

Best of luck!~~Enjoying the hobby one flight at a time~~

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05-27-2007 06:00 PM 13 years ago

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oldfart

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Vancouver, Canada

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wrathofken

I still susoect it is the batteries. I am not familiar with the 4000mah 20C maxamps, but I have tested a few batteries of the same rating, using my Eagle Tree system to monitor them and found that they dropped a lot more then I thought they should under heavier loads.

The extra 15mm of blade length of the 530's will load your head, at the same rotor speed (this is what gives the cyclic response rate) about 15% to 18% more then the 515's.

This may just be enough extra load for your battery pack to drop a volt or so. This drop will result in about the head speed drop you have seen.

E.g. Battery pack A may deliver 21.9 volts under a heavy load while Battery B will only deliver 21.1 This 0.8V difference will make a difference in the resultant rotor speed.

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05-27-2007 11:17 PM 13 years ago

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wrathofkhan

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LA, CA - US

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thanks for your posts.

i didn't readjust my throttle pitch, i have jazz 55-10-32 and is set 100%.

i flew 5 battery packs today, (4 x Maxpam 4000 20C, and TP 3850 Extreme). listed below are my observations:

1) head speed - 2050-2100 using optical tach

2) motor temperature - i measured right after landing with a infrared temperature gauge (120 degrees, i guess it was a bit warmer when it was running

3) lipo pack's temperature - also measure after landing, was around 110 degrees

4) esc temperature, less than 105 degrees

NOTE: temperature at the flying field was around 80 degrees

5) flew between 6-7 minutes on each pack, they are being charged right now, not sure how much i will be putting back in yet

6) my elogger is not working properly so, couldn't use it ... but i had measured it before with 12t, and it had some spikes of 40 amps, and maximum watts used was around 850

i do have another set of blades (rotortech 515) ... and they fly a lot better for aerobatics, but i think for practicing autos, the helimax 530s are better.

from the above mentioned, i think the 1907 can handle the blades ... will find out a bit more after my charger finishes.

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Home › ✈️Aircraft › 🚁Helicopter › e-Century Radikal E640 - Swift 16 NX › Swift HS - can the Neu 1907/1.5y handle the blades?

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