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Home✈️Aircraft🚁Helicoptere-SABGoblin 500 › Goblin 500 sport Gear ratio
08-09-2020 10:21 PM  49 days ago
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joseheli

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Orange Park, FL

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Goblin 500 sport Gear ratio
Hello,

Just a simple question:

Goblin 500 main gear is 165. The motor gear standard is 18. If we divide that is 9.16.

Why the goblin book says is 9.18:1?

Just need the correct info to set up the governor
"No crash, No gain"
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08-10-2020 06:47 AM  49 days ago
Rojoalfa

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Punta de Mata, Monagas-Venezuela

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Good question.

I know that goblin has a two stage drive, one with a belt and then with pinions.

According to instruction manual:

Motor pulley 18T
Pulley 48T
Pinion 18T
Spur 62T

Ratio =(48/18) * (62/18) = 9.18

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Saludos cordiales,
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08-10-2020 07:49 AM  49 days ago
Rojoalfa

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So, the "Real main gear T" is:

Doing some "grouping":
Ratio = (48 * 62/18) / 18

48*62/18= 165.333333
This is fixed on the heli gearbox.

Non metric notation:
Main gear = 165-1/3 T

BTW, it is not 165T

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08-10-2020 04:17 PM  49 days ago
joseheli

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Orange Park, FL

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So 9.8.1 gear ratio on my Vbar setting I will add it as 9.81 correct? Or 9.8?"No crash, No gain"
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08-10-2020 08:43 PM  48 days ago
Rojoalfa

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Punta de Mata, Monagas-Venezuela

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I can't follow you.

Ratio = 9.18 : 1

That notation means 9.18 turns on the motor for 1 turn on the main rotor.

So, You must type 9.18 on the setting if you have 2 decimal places.

If you have only one decimal, you must type 9.2 ( rounding to 1 decimal place)

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Saludos cordiales,
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Home✈️Aircraft🚁Helicoptere-SABGoblin 500 › Goblin 500 sport Gear ratio
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