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MS Composit › Anyone know how many amps the Twister motor pulls?
10-11-2005 01:31 AM  12 years agoPost 1
johnny b

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Central Coast, CA

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At hover?

Full deflection of blades?

I know the TP1320's work well with the set-up, I'm wondering if one of the newer generation TP900's would work well considering the constant discharge rates are supposed to be much better than a year or two ago. Its about an ounce difference in weight..

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10-11-2005 07:14 AM  12 years agoPost 2
jiri

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Aalborg, Denmark

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My Axi motor draws around 6-7 Amps in hover, around 7-8 Amps on average
and 10-12 Amps at full throttle.

Jiri

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10-11-2005 12:30 PM  12 years agoPost 3
DarkHorse1

rrApprentice

Gloucester UK

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The 3xTP900 (Gen2 59g/2.1oz 12C (11A) continuous) should make the Hornet feel more agile with the weight saved. I haven't seen any Pro lite versions yet. www.thunderpower-batteries.com have 3xTP730 (Prolite 49g/1.7oz 13C (9.5A) continuous) but not sure about their life span if pushed.


For cruising about I couldn't tell the difference between 3xTP1320 Gen2 91g/3.2oz and 3xTP1320 Prolites 85g/3oz.
The X3D battery up front design is stuck with a 75-85g pack for good Centre of Gravity.

I crudely measured ~3 Amps at 2500rpm with zero pitch and 4 to 5 Amps hovering AUW was 365g. Flight times are 15-16 mins of hovering to mild flight 2500-2800rpm. Worst case approximately 1.320 Ah gets burned in 0.25 hours is a rough average of 5 Amps. Land when load voltage hits 9.3v, simple charger so I have no charge input numbers.

MS116 ESC for Twister - Current: 8A cont / 12A Peak
EM 300 Twister Axial Brushless Motor - Current: 8A cont / 12A Peak, 45g


Jiri, nice to hear your still flying that Hornet . Your Amp numbers seem a little on the high side .

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10-11-2005 02:42 PM  12 years agoPost 4
justJevvy

rrNovice

UK - Reading

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will you not have CoG issues with a lighter battery on an X3D?

I had to mount RX & gyro behind the main shaft to get mine to balance with a TP1320 - I did leave the boom supports off but cant see these makin too much difference.

Interested to hear your findings.

X3D, Twister & Duzi Swash

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10-11-2005 03:41 PM  12 years agoPost 5
jiri

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Aalborg, Denmark

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Sure, I am still flying :-) You really have a long flying time DarkHorese!
I usually fly for 8-9 minutes and my TP 1320 take back about 1 Ah.
I know I could fly little bit longer but I prefer to land a few minutes
earlies and prolong the battery life time. I also fly a higher RPM and
moreover, I am now using longer (28cm) main blades, which adds
a lot to the stability and power. That is maybe why my power
consumption is so much higher than yours.

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10-11-2005 03:53 PM  12 years agoPost 6
Micro-Maniac

rrElite Veteran

Pasco,Washington Formerly: Captain Chaos

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I use the timer on my radio and quit at 12 minutes. I fly a constant mixed style (love those piroflips) the whole 12 minutes. If I check the voltage when done, it's always right at 11.0v. And my charger will only take them to around 12.4v instead of 12.6v. I'm waiting on a new TP charger. My packs are 1320 Pro`lites.

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10-11-2005 04:13 PM  12 years agoPost 7
DarkHorse1

rrApprentice

Gloucester UK

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> will you not have CoG issues with a lighter battery on an X3D?
justJevvy, yes that is true but I think only you and I are using a X3D frame configuration.


Landing early is a good idea, normally fly 2 or 3 times per pack and grounded before the lipo low voltage detector kicks in.

> also fly a higher RPM and moreover,
> I am now using longer (28cm) main blades,
I really wanted to try a set of 280 mm KOKs but wasn't sure about tail rotor interference issue. I guess that is what your flying, are they just a straight replacement the 257 mm blades with out any modifications to the tail boom/shaft. I measured up for 280 mm blades and the rotor distances where very close, the tail rotor would probably make a terrific noise in rotor downwash.

How much different is your setup now? weight, gearing, rpm range etc.

Sorry for the thread diversion.
Thanks in advance.

Hornet X 3D Twister(Axi 2208/20, Tsunami), MS-116 ESC, MS-044 gyro, KOK Extréme white blades, 3xTP1320 prolites ~15mins, AUW=375g. Futaba7C

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10-11-2005 05:01 PM  12 years agoPost 8
jiri

rrApprentice

Aalborg, Denmark

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Yes, I had to make the boom 2cm longer to fit the longer blades. My set-up
weight is now about 360g, Duzi one-way with 12T pinion. I have not measured
the RPM recently but think it was between 2600-2700.

Jiri

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10-11-2005 05:40 PM  12 years agoPost 9
johnny b

rrApprentice

Central Coast, CA

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Jiri,

So you lengthened the tail and made a new CF tail drive shaft?

What did you use for the new tail boom?

No harm diverting thread, my question was answered, thanks guys.

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