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HomeAircraftHelicopterHelicopter Main Discussion › Tail Drive Belt sizeology.
08-14-2018 12:43 AM  38 days agoPost 1
Mikerobe

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Green Turtle Cay,Abaco, Bahamas.

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Anyone know the sizeology of the belts our helis use? This is the number for the belt on my Hirobo Freya, Bando S3M 1800UK JG.
I've looked at "Bando" online but didn't quickly find a chart of sorts to identify this belt.
I'm building a scale heli and would like to extend the tail length to locate the tail drive output accordingly.
I had a Stock Drive Products catalog a few years ago and as I remember, it required a good knowledge of belt sizeology to locate what you were looking for.
Perhaps someone has done this already and knows how and where to get "the belt"!

The lot I got is not a lot, but I thank God a lot for the lot I got!

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08-14-2018 02:10 PM  38 days agoPost 2
BeltFedBrowning

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Kansas City

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Depends on the width. This is the same length that Miniature aircraft used on their 600 sized birds. These belts are about 1/4 inch wide.
https://www.ebay.com/itm/D-D-PowerD...ksid=m570.l1313
http://shop.sdp-si.com/catalog/prod...d=A_6R23M600060

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08-14-2018 02:15 PM  38 days agoPost 3
BeltFedBrowning

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Kansas City

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I used the belt from Ebay on my Outrage Fusion conversion from a torque tube to belt drive.

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08-14-2018 06:18 PM  37 days agoPost 4
Mikerobe

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Green Turtle Cay,Abaco, Bahamas.

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Hi BetFedBrowning,
I,ve e-mailed Stock Drive Products and asked for some assistance, they've forwarded my request to engineering.
According to my research, the belt I would need would be 1863mm long, 6mm wide, with a pitch of 3mm. This would be 63mm longer than the original and would allow the tail output to be moved back to where I need and still have the tail boom supported by the main frames.

The lot I got is not a lot, but I thank God a lot for the lot I got!

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08-14-2018 07:22 PM  37 days agoPost 5
BeltFedBrowning

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Kansas City

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So, did you need the tail 63mm longer or a 63mm longer belt? An 1863mm belt would make your tail 31.5mm longer than a 1800mm belt as long as there are no pulley changes.
1863mm
http://shop.sdp-si.com/catalog/prod...d=A_6R23M621060
https://www.ebay.com/itm/D-D-PowerD...EAAAOSwPAxaFiGc

This is a handy tool!
https://sdp-si.com/eStore/CenterDistanceDesigner

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08-14-2018 08:28 PM  37 days agoPost 6
Mikerobe

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Green Turtle Cay,Abaco, Bahamas.

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Yes, I'm putting my Freya into a Marvel Craft A109 fuselage. Using the stock tail boom length will inhibit the use of longer tail blades as only 95mm will fit between the tail output location and the horizontal stabs.
Also, the tailrotor shaft is way to far forward as compared to the full size A109.
The additional 31.5mm will place it where it should be!

The lot I got is not a lot, but I thank God a lot for the lot I got!

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08-14-2018 08:50 PM  37 days agoPost 7
BeltFedBrowning

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Kansas City

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Like I posted before, here is the 1863mm belt at SDP-si
http://shop.sdp-si.com/catalog/prod...d=A_6R23M621060

Here is the belt from Ebay. I like these for the price.
https://www.ebay.com/itm/D-D-PowerD...EAAAOSwPAxaFiGc

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08-14-2018 09:17 PM  37 days agoPost 8
Mikerobe

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Green Turtle Cay,Abaco, Bahamas.

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"BeltFed"Browning, hope you're not eating these?
Thanks, I've looked at both the links you've included. Prices are really good, wonder if the quality is there too?

The lot I got is not a lot, but I thank God a lot for the lot I got!

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08-14-2018 09:51 PM  37 days agoPost 9
BeltFedBrowning

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Kansas City

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I have been flying the ebay belts from the same seller for three years. They are a little thicker than the SDP-si belts. So, if clearance is a problem, the SDP-si belts are thinner. They are both the same width, the ebay belts just have more layers of fiberglass or whatever they use. You can see the difference between the belts in these pictures. The one installed on the heli is an Ebay belt. I am not at home where I can take a pic. Hopefully you can see the difference.

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08-14-2018 10:16 PM  37 days agoPost 10
BeltFedBrowning

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Kansas City

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A new belt does smell good enough to eat. Maybe that should be my new signature phrase

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08-16-2018 06:24 PM  35 days agoPost 11
John Benario

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Las Vegas

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Bando S3M 1800UK JG

Belts are defined by the tooth profile and length. Your belt is an S3M profile, 1800 MM long. The UK and JG are production run, date, etc. They are not significant. The S3M is a 3mm pitch. Bando is the manufacturer.

Most of the black tail rotor belts used by RC helicopters are the S3M style. The orange style belts that the raptors use is .2 inch pitch XL style. Since most of the world is metric the XL belts still use millimeter lengths.

You can replace your belt with any S3M belt from any manufacturer.

Here is the Stock drive belt explainer.

http://www.sdp-si.com/products/deta...belt-detail.php

Team highest quality
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08-16-2018 10:27 PM  35 days agoPost 12
Mikerobe

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Green Turtle Cay,Abaco, Bahamas.

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Hi John,
Yeah I've done a lot of research on "The Belt". The belt that Hirobo uses on the Freya is a Bando, Synchro-Link, Neoprene, S3M-1800. BandoUSA does not stock this length belt. The nice feature of the Synchro-Link is it's thin profile top to bottom, 2mm or less. It also has an additional cutout between each tooth to allow better folding and fit to the pulleys.
Most of the other belts I've found online have a thickness of 2.4mm. I'd much prefer one of the thinner profile belts if I can get one.
I contacted one of the other big US suppliers of timing belts and they didn't stock anything in this length either. The gentleman also said he was not allowed to sell me a belt to be used in a helicopter even if he did have the correct length. We didn't go into any of the details as I was paying for an international call.

The lot I got is not a lot, but I thank God a lot for the lot I got!

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