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Other › 1700Kv on Gaui 425
01-13-2010 03:33 AM  8 years agoPost 1
mkirsch

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Rochester, NY

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According to Gaui's head speed calculator, a 1700Kv on 6S with a 13T pinion will run a 3055RPM head speed. Is that too high?

Extrapolating for a 12T pinion, head speed is down in the 2800's. Is there enough adjustment for a 12T?

The reason I ask is because I can get the JustGoFly 20-size heli motor locally.

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01-16-2010 03:35 AM  8 years agoPost 2
yys5617

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Taipei

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How about using 60T front gear ?
It seems that GAUI dose not supply 12T pinion gear !
How about use 60T front gear with 14T pinion gear,
which will run 2743 RPM head speed,

I think it is much easier to get the head speed down in 2800RPM with 1700KV motor!

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01-21-2010 11:53 PM  8 years agoPost 3
zaw

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Lebanon, NH - USA

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I would make sure you can go lower head speed.. I was going to get 1700kv for my my 425 with that setup but turn out there is almost no way to slow it down slower. I eventually settled with 1400kv.

14T was too much speed for me so I went to 13, much more confortable.

ಠ_ಠ HBK2 built with inexpensive parts! ٩๏̯͡๏)۶ Gaui425

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01-23-2010 08:01 PM  8 years agoPost 4
Flyextreme

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San Pedro,Ca

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I went through a simular situation with gearing mine down as low as I could to use a Scorpion 1400kv. Of course I was shooting for a slightly lower HS because I'm swinging 550mm blades. You don't want to have to run your motor lower than 85% to get the HS you want.

The smaller the pinion, the less gear mesh, the easier to strip gears.

Use only Gaui pinions (the mod. is different than most). The Gaui pinions come in just about any size you would want to use. You can find the same mod. in different brands, but it's not easy.

I think 1400kv is about as high as I would go....1100kv is even better, and gives you more gearing options.

Bill

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01-23-2010 08:20 PM  8 years agoPost 5
BladeRex

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Temecula, Ca

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It shouldn't be a problem. I run a 1600kv motor on my 550 w/ 550 blades. You just need to use a Gaui 60t spur or Revco 68t (these have smaller pitch teeth so the spur isn't any bigger).

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01-23-2010 08:24 PM  8 years agoPost 6
Flyextreme

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San Pedro,Ca

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So are the Revco gears a different mod? And, over time do you have any adverse effects? Gear mesh is good? Etc.

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01-23-2010 08:58 PM  8 years agoPost 7
BladeRex

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Temecula, Ca

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It's just a company that makes some after market gears, the ones they offer for Gaui are the same pitch as the Trex500 (one of my pinions is actually for the Trex-they're longer than ours but it still works). Mesh is a big harder to set as it needs to be more spot on w/ the slightly smaller teeth. I did end up melting one because I had the mesh too tight, not sure if I forgot to double check it after last torquing of motor mount screws or if it somehow moved afterwards, same could happen w/ stock gears. There was several threads about them a few years or so ago (that's how I found out about them).

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02-06-2010 02:37 AM  8 years agoPost 8
jjs1957

rrNovice

Dallas, TX USA

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1700Kv on Gaui 425
I used the following very helpful table for my 425 setup:
http://www.ezfly.se/hscalc.htm
Insert "stock motor" for motor type
Insert appropriate gear info
Insert "Kv" value of your motor
press calculate and there you have it

Good luck!

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03-16-2010 03:11 AM  8 years agoPost 9
yys5617

rrNovice

Taipei

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I used the following very helpful table for my 425 setup:
http://www.ezfly.se/hscalc.htm
Insert "stock motor" for motor type
Insert appropriate gear info
Insert "Kv" value of your motor
press calculate and there you have it

Good luck!

Seems EZFLY.SE has changed their site into "http://www.pitchup.se";

And I found the Head speed calculator at GAUI:
http://www.gaui.com.tw/html-en/550_rotor_speed.html

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