RunRyder - Motor RPM

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e-Electric Motors & Controllers > Motor RPM

Sparkhead
Key Veteran
Location: Melbourne Australia

Hi,

I'm just starting to get into electric helis and have just got a secondhand Kontronics Beat 40-6-12 and a Twist 37. I have an 8 cell 3000NiMH batterry and wanted to spin my 385mm blades at about 1900-2000 rpm. I have 14 and 18 toothed pinions and can also buy 15,16,17t pinions. How do I work out what combo to use? The gear ratios are as follows- 14t=20.09:1 15t=18.75:1 16t=17.58:1 17t=16.54:1 and 18t=15.62:1

I tried the 14t and tached the blades at 1640 and hovered for about 7 mins. I tried the 18t and it looked very fast wasn't game to tac it and the battery only seemed to last a few minutes.

Can anyone give me some advise please?

Mick.

11-11-2003 Over year old.

Saint728
Elite Veteran
Location: Sydney Australia Sponsored by: Quick UK

What kind of helicopter is this, because those are some really short blades? Is it a Robbe Eolo? Go to this link and you will find a RPM calculator. http://rceheli.com/ss/sheet or this one. http://www.e-helis.com/helicalc.php Try the different pinion combinations in the calculator and it will tell you which one your going to need. BTW, the Twist 37 has Kv=3700. You will need to know this number for the RPM calculator.

Take Care,
Cheers, Patrick

11-11-2003 Over year old.

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Sparkhead
Key Veteran
Location: Melbourne Australia

Thank you Patrick,

Yes it is an Eolo. Is it worth using 10 cells instead of 8?

Thanks,
Mick.

11-11-2003 Over year old.

Saint728
Elite Veteran
Location: Sydney Australia Sponsored by: Quick UK

Hey Mick, you should buy a 15 tooth pinion gear and just use the 8 cell 3000 NiMH. With this combo, you should get a little more then 1800 RPM's. 10 cells will be too much power even for the 14 tooth pinion, it will get you over 2000 RPM's. I would suggest buying a 15 and 16 tooth pinion gear and use the 8 cells. Try both pinions out and see which one you like best.

Take Care,
Cheers, Patrick

11-11-2003 Over year old.

HOMEPAGE

Sparkhead
Key Veteran
Location: Melbourne Australia

Hi Patrick,

Thats what I thought I'm just ordering a pinion set right now. Thanks for the info.

Regards,
Mick

11-12-2003 Over year old.

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e-Electric Motors & Controllers > Motor RPM

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