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Other › Best Battery Pack
01-23-2007 11:15 AM  10 years agoPost 1
Sixter

rrNovice

LaGrange, Georgia, USA

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I am building a Blade CP with the Brushless 370, GWS DD Tail Motor,
Sym Wood Blades, CC 25 amp ESC, Bell Mixer Upgrade kit, JR DS285 Servos and a 401 Gyro. Specktrum DX7 Tx with the AR 6000 Rx.
Which Battery pack will be the best, the TP 730 3 Cell or the TP 910 3 Cell.

Thanks
Sixter

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01-23-2007 11:53 AM  10 years agoPost 2
DarkHorse1

rrApprentice

Gloucester UK

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With the 27g gy401 gyro and CC25 ESC I expect your heli is a little heavy ~350g? Probably best go with a 3xTP910mAh or a greedy heli might well have a very short runtime on 3xTP730 packs.

Just over 320g with a 3xTP910 and brushless at 2000 rpm you should get ~16 mins of cruising with mild inverted, floops and tumble rolls. If your heli weighs 280g with 3xTP730 then you can expect more agile acro for ~10 mins. I settled at ~300g with 3xTP910 and soft brushless at 2000 - 2200 rpm 570 mm rotor for a ~15 min mild acro warm up heli.

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01-23-2007 12:04 PM  10 years agoPost 3
stickyfox

rrKey Veteran

Rochester, NY - US

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Is it really necessary to run a 25A ESC on a park 370? I'm thinking about building a brushless CP and I'm looking at the E-Flite pro 10A ESC. It surges up to 13A I think. Either that or the Castle 18A.

If I start getting 5-minute run times when I switch from brushed to brushless I'm really going to be pissed.

-fox

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01-23-2007 01:08 PM  10 years agoPost 4
DarkHorse1

rrApprentice

Gloucester UK

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Generally speaking you should see a 20% gain in hover runtime if the weight and head speed remains the same. At best I have hovered ~18 mins airtime (with stops) down at 1800 rpm brushless long rotor, where the last few mins are really poor on performance. I also saw about 20% better runtime when using flat bottom low pitch more efficient MS FP blades (with computer TX and mods). I would go back to the stock brushed motor but I blew my 4in1 BEC, that setup is simple to use and with a couple of mods fly's well enough without the hassle.

My top mods:
Computer Tx, Dx7, Futaba7C or better
Thunder Power 3x910 mAh battery
DD tail and mini prop
Advance brushed motor timing end cap 6 mm clockwise
Choose longer more efficient 255 mm blades to suit, symmetrical for acro or flat bottom for duration
Lighten to below 300g (dump heat sinks when lighter etc.)

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01-23-2007 01:39 PM  10 years agoPost 5
slider46

rrProfessor

Ocala Florida

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Stickyfox Going Bl is just more problems waiting to happen... The blade is good just the way it comes with a DD tail. It's cheap and easy to fix at the field... Rather than put the money into a BL cp I would look at a trex SA... For under 200 bucks you really can't beat it.....

Tom..... No "D" flying....

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01-23-2007 02:44 PM  10 years agoPost 6
Avropilot

rrVeteran

Murfreesboro, Tennessee

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I run a TP 1320 Pack with a eflight 20Amp Esc, Eflight Hacker 4700Kv brushless motor, DD tail, 9 tooth pinion. I get 10 mins and thats with hard 3D.

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01-23-2007 04:20 PM  10 years agoPost 7
DarkHorse1

rrApprentice

Gloucester UK

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Wow according to my Helicopter Power & Setup Calculator tool that's nearly an 8A average. Would be interested to see how your DD tail holds up.

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01-24-2007 02:34 AM  10 years agoPost 8
Sixter

rrNovice

LaGrange, Georgia, USA

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Thanks for the replies I am going with the TP 910 3cell pack and may
go with the CC TB 18 amp ESC in place of the CC 25 amp ESC. Any other suggestions on ESC's.

Thanks
Sixter

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01-24-2007 02:45 AM  10 years agoPost 9
stickyfox

rrKey Veteran

Rochester, NY - US

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If anyone can give a straight answer on how many amps you need for that motor I'd be interested in knowing too. I think that Castle 18 is pretty awesome for its size. They make a 9 too but that might be pushing it if you want to do anything other than just fly around.

-fox

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01-24-2007 02:56 AM  10 years agoPost 10
Sixter

rrNovice

LaGrange, Georgia, USA

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Fox, the spec sheet on the 370 say's continuous Current: 8 amp with a Maxium Burst Current of 13 amp for 15 sec. The 18 amp ESC sould be more than enough. Also the CC TB 18 amp ESC weighs the same as the CC 25 amp ESC. The CC 25 is almost twice the price of the CC 18 amp ESC.

Sixter

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01-24-2007 07:21 PM  10 years agoPost 11
Martin_gsxr

rrVeteran

Toronto

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10amp is more than enough for E-flite 370/ Himax 2015 brushless motor...

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01-24-2007 11:47 PM  10 years agoPost 12
TomFoolery

rrApprentice

mandan, ND

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agree, a CC phoenix 10 will work on the CP just great, more expensive than the E-Flite, but it does have full programming capabilities and a good Governor mode. Will run 13 amps all day with no problems.

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