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HomeAircraftHelicopterClubs and Associations › Goblin Black Nitro 700
08-25-2017 02:01 AM  16 months agoPost 1
Mputu

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Killeen, TX

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I am asking for help to anyone who knows how gear ratio on Goblin is calculate. I have BlackNitro 700 and on the book it states that using engine pulley 26T, the gear ratio is 7.64 and really can't figure it out how the they come up with that number. Well, after my crash I ordered parts and I have received 27T instead of 26T. I don't want to return the part since I use governor, I believe knowing the right gear ration I can still use it. I will appreciate any feedback you may have, thank you.

Fly hard, Land safe

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08-26-2017 12:15 AM  15 months agoPost 2
Mputu

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Killeen, TX

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Still no comment! well, this what I find out on Helifreak; Goblin has a two set gear system someone posted this a spreadsheet with all the math done already and all you have to do is plug in your data (see link below)

https://www.helifreak.com/showthread.php?t=396839

Fly hard, Land safe

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08-26-2017 03:24 AM  15 months agoPost 3
Mputu

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Killeen, TX

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I was curious to know exactly how the two system gear is calculate! Here is what I find out with the spreadsheet on the link above; for example Goblin 650 has a gear ratio of 7.64 with an engine pulley 28T and G700N has a gear ratio of 8.23 with an engine of pulley 26T.

Both machine have 68T main gear 19T small gear and 60T, and the difference is on the engine gear.

G650 28T ===> 60/28T= 2.14 ==> 68/19= 3.57 Final gear 3.57*2.14= 7.64

G700N 26T ===> 60/26T= 2.3 ==> 68/19= 3.57 Final gear 3.57*2.3= 8.21 the book has it for 8.23 because they use 3.578.

Fly hard, Land safe

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12-16-2018 04:43 PM  1 day agoPost 4
Dan Minick

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Columbus, WI

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You probably didn't get any responses because this post is no where near the right section of the website to be posting this topic in

Team Synergy, Team FBL Rotors-------if its not broke...it will be!

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