600mx v 4025 on a 700? - HeliFreak
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Old 11-04-2016, 04:17 PM   #1 (permalink)
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Default 600mx v 4025 on a 700?

Guys, getting ready to shave as much weight off my Goblin 700C as possible.

After doing a little research it appears a pyro 700-52 is a good choice for a motor on a 700, and it's a 3kw motor @ around 390grams.

Looking in the 3kw range turns up a bunch of 4025's like the scorp 4025-550 which weighs in @ 354g.

Looking a little further I turned up the 600mx which is rated @ 3.3kw weighing in at 340g

I don't want a complete dog here, so I'm not sure where to land on the power system. I currently have a 4525-520u which weighs in @ 500g.

I'm also planning to convert my 700C into basically a stretched 630c and run either 6s 5k, or 12s 3300 - 4000 (undecided).

I'm shooting for around the 4.5kg range.
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Old 11-05-2016, 07:56 AM   #2 (permalink)
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I have used a bunch of 600MX/510s but only in 600 size helis and they have been extremely capable. My first 12s 600 was a Hirobo SDX converted to electric, so the gearing options were very limited (only an 85 tooth main gear).

I used a Hobbywing 70HV and trying to just guess at a reasonable throttle % and on the maiden flights we tachoed it and I was getting 2370 headspeed! It was an absolute rocket (and this was a heavy airframe, it came in at 4.2kg with a couple 2600mah packs).

My thought would be that if you can gear it long enough it should work. I think the bigger motors can deliver more torque at lower throttle due to the larger can but the 600mx really punches above its weight, I'd be curious to see how it works.
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Old 06-21-2017, 08:19 PM   #3 (permalink)
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Castle has a nice looking 600 530kv cheap... Heard steve Nue designed it, is that true?
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Old 06-23-2017, 10:03 AM   #4 (permalink)
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I use sk3 600 520kv on my 700, i fly low headspeed and sport flying.

Nikki
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Old 06-28-2017, 12:40 PM   #5 (permalink)
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Quote:
Originally Posted by n8rloves2fly View Post
Castle has a nice looking 600 530kv cheap... Heard steve Nue designed it, is that true?
That motor is just a green KDE 600xf 530kv. Its got about the same power as a 4035 scorpion.
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Old 06-30-2017, 09:34 AM   #6 (permalink)
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Flying a Pyro 700 Comp in my 4.3Kg TDR making 5Kw peak.
It has lot's of power, can fly back to back all day. 1400-1850rpm

These 4030/35 motors make good power for their weight, unless you are doing speed runs I don't see a need for the 4525+. They themselves add weight but also you'll be running a 160/200 Amp controller versus a 120A and you will be running higher capacity packs to make up flight time lost to the heavier/hungrier 45XX motors.

In the end I feel I get more performance from a lighter weight, modestly powered machine than a Monster powered Porker.
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Old 06-30-2017, 09:35 AM   #7 (permalink)
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And then there's this

Nico Niewind - Banshee 700 + Pyro 650 (4 min 36 sec)
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Old 06-30-2017, 01:23 PM   #8 (permalink)
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Quote:
Originally Posted by GimpyGolden View Post
These 4030/35 motors make good power for their weight, unless you are doing speed runs I don't see a need for the 4525+. They themselves add weight but also you'll be running a 160/200 Amp controller versus a 120A and you will be running higher capacity packs to make up flight time lost to the heavier/hungrier 45XX motors.
Certainly no need but it is fun. You can get away with a 120a esc on a 4525 but going bigger than that you will need a bigger esc. The 4525 is also only like 10-20g heavier than the 4035 so IMO its a no brainer if money isn't an issue.

IMO there's no reason to put in a huge overkill motor unless you're going to up the headspeed or pitch. If you're not bogging at 2100 and 12 degrees of pitch with your current motor, adding a motor that's 100g more and a heavier esc is just a waste of flying weight. You're not going to notice more power because the motor only gives what's asked of it, and 2100 and 12 degrees is still 2100 and 12 degrees. For the same increase in weight you could have put on bigger packs.
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