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Other › So If Your Goblin Gets Loud......
02-01-2013 03:26 PM  5 years agoPost 1
Ronald Thomas

rrMaster

Gainesville, Fl, USA

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I have found the Goblin to be a very quiet machine. Over the last 25 flights or so it started to get louder. Overall sound was louder in the air and the tail sounded like it was making noise on spool up. I checked over the heli (so I thought I did a good job) and kept flying.
One day two weeks ago I went to fly. I spooled up, flew for 2 minutes and then the HS dropped to about half. I thought I had over amped the ESC or I had a cell die in a battery because it was so sudden. I landed and flew the 130 and put the Goblin to the side. I got in a rush and forgot to check the heli then.....mistake as I out it on the wall and forgot about it when the busy week came around.
So a couple of days go by and I am ready to fly again, I charge (8) 6s packs, and head to the field. I do a preflight check and remembered I had that shut down. I looked it over and didn't immediately see anything wrong like a shorted motor lead or bad solder joint (usual suspects in these situations when an over amp is not the issue). I figure I better at least spool it up to see if there are any issues. I spool it up, it is LOUD, I immediately kill it and take it back to the pits. At this point I AM going to find the issue!!!
I start looking for something electrical and then I moved on to mechanical. I looked at the belts from the edge.....they look good. I looked at the other nuts and bolts....they all look great. At this point I am upset so I start taking the heli apart and looky at what I find!

Turns out I had a bad main drive belt for a WHILE and didn't notice it! I realized it is extremely hard to see the belt teeth if you don't look closely.
I replaced both belts (the tail belt as a precaution) and she is like brand new again
Moral to the story, CHECK YOUR HELIS THOROUGHLY when you have an issue....I got luck this time, I may not be next time

Team MikadoUSA 480XXTreme, 550SX, 600SX, 700XXTreme, 800XXTreme!!

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02-01-2013 04:42 PM  5 years agoPost 2
VANHELI

rrVeteran

Omaha,Nebraska

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Thanks for sharing! Gonna check both my belts now.

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02-01-2013 04:44 PM  5 years agoPost 3
wrongler

rrProfessor

Brewerton, New York

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The heli will tell you when something is wrong, By noise or how it acts, sometimes the hard part is finding the problem!

Bill Whittaker

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02-01-2013 07:50 PM  5 years agoPost 4
Tyler

rrElite Veteran

Chicagoland area

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Half the teeth, half the head speed.

Enjoy things that money can buy IF you don't lose the things money can't buy.

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02-01-2013 09:33 PM  5 years agoPost 5
Ace Dude

rrProfessor

USA

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Looks like a Gates belt. Perhaps you can find a replacement locally?

  

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02-02-2013 02:25 AM  5 years agoPost 6
seefest

rrNovice

South Dartmouth, Ma.

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How many flights on heli till belt failed? They recommend changing every 100 flights although lots of guys have gone hundreds on same belts.

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02-02-2013 12:24 PM  5 years agoPost 7
BigQ951

rrNovice

Woodbridge VA

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Before installation did you by chance treat with silicone? That belt looks drier then elbows. Just my opinion.

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02-02-2013 12:30 PM  5 years agoPost 8
Ronald Thomas

rrMaster

Gainesville, Fl, USA

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It is the original belt and it is about a year old. Yes I did treat it with silicone as I do with all my belts. I do that every 10 flights or so. I am sure I am WELL over 100 flights

Team MikadoUSA 480XXTreme, 550SX, 600SX, 700XXTreme, 800XXTreme!!

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02-02-2013 08:17 PM  5 years agoPost 9
1004ron

rrApprentice

Louisville, KY - USA

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Looks like a Gates belt. Perhaps you can find a replacement locally?
I can find the tail belt from an industrial supplier, but not the motor belt.

http://www.royalsupply.com/store/pc...-1036p17301.htm

http://www.worldbelting.com/products/gates-3mr-2061-06

These belts are a similar construction to car timing belts, and they last >60,000 miles, so I'd expect the heli belts to last well over one year.
I've seen the video that advises pulling the motor towards the front on the heli when doing the belt tension - I chose not to do this, because past experience has taught me that these types of belts fail very quickly if just slightly over tightened. With the motor mount loose and free to travel I rotate it a few times and then lock it up relying solely on the springs - I then feel the belt and its always felt just right to me using that approach.

Watch at YouTube

Goblin 700 AR7200BX / T550E V2 AR7200BX / 450 Pro FBL, GT5

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