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11-10-2012 03:10 AM  7 years ago
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mrultralite

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abbotsford bc canada

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question?
I've had in mind a Jetranger build [now 700size] using goblin mech [parts not whole bird]. I'm a bit hung up on the tail belt /TT as i can foresee problems w/ length ie main mech -tail [thats the 1st Question]. 2nd question; I know a TT solves that but where to find bevel gears, i guess off various helis , but would be hard buying parts unseen off the net. If i had them all laid out i could figure something out.

PS; i have no problem fabricating stuff, but no mill [ some on lathe]
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11-10-2012 05:06 AM  7 years ago
SSMKN2

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Trenton, IL

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If you are trying to avoid a tail belt get a wire drive system...work well for me for scale.Joel
MD 500D
Bell 206
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11-10-2012 06:51 AM  7 years ago
mrultralite

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abbotsford bc canada

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That's a new one , sounds like I'd still need bevel gears.
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11-10-2012 07:03 AM  7 years ago
mrultralite

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I guess the tail end would be easy enough. Peter Wales has a bevel gear adaptation for his Goblin stuff, god knows where it came from. All very mysterious. I know I'm not going with the pre packaged mechanics options, too many $ and not what I want.
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11-10-2012 10:48 AM  7 years ago
SSMKN2

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I see, never looked at the tail rotor gearbox side of the flex drive. I would assume there is a bevel gear there. There is a bevel gear on the front side working off the main gear.Joel
MD 500D
Bell 206
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11-10-2012 12:54 PM  7 years ago
Peter Wales💎Sustaining Member

rrElite Veteran - Orlando Fl - MyPosts All  Forum  Topic

I have been developing a set of scale mechanics based on the Goblin for some time now. I have a set flying very nicely in an RC Aerodyne 600 size EC145. They will be marketed through Joe Howard at ECSH when he does the final test on a Vario Jet Ranger as soon as the kit arrives from Germany.

Once that is proven to work faultlessly we will put it into production hopefully before the end of the year and you should be able to buy a complete set of mechanics for around $700 including the Goblin parts, an extended main shaft and a selection of either belt drive to the Goblin tail rotor gearbox or TT drive through Vario or any other TT gearbox.

This is a picture of the system after building on my 3D printer but before committing to aluminum

We have to get it perfectly right before we sell it as something failing will be very expensive if it causes a crash so be patient while we finish the testing.
Peter Wales
http://scalehelicopters.org
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11-10-2012 05:11 PM  7 years ago
mrultralite

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abbotsford bc canada

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Peter, i see now, didn't know it was a commercial venture.
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11-10-2012 05:55 PM  7 years ago
coptercptn

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Mesa AZ. USA

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I had a chance to "Ogle" that set-up in Dalton....Very nice answer to a mutitude of problems!!! get er done JOE!!Home of the "Sea Cobra".....
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11-12-2012 07:44 AM  7 years ago
mrultralite

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abbotsford bc canada

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I wonder how you get around the servo sticking out 70mm ( so I'm told ) on one side. Other wise I might go ahead with this myself.
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11-12-2012 04:30 PM  7 years ago
coptercptn

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Mesa AZ. USA

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I had that issue with a cobra build once and found a "low profile" servo..? Just a thought...Home of the "Sea Cobra".....
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11-12-2012 05:53 PM  7 years ago
mrultralite

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Thanks copter, they would have to be savox looks like.
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11-12-2012 08:53 PM  7 years ago
mrultralite

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i find the marvel craft aren't accurate [for accuracy weenies, its catching] ,tail boom is supposed to angle up a bit. surprising. Still humming and hawing, curious to see how peter wales solves this servo problem , also the goblin head to tailshaft is 952mm , a bit long. The MC jetranger is < 100mm wide at the critical spot.
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11-12-2012 10:40 PM  7 years ago
Peter Wales

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Orlando Fl

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💎Sustaining Member
I dont think you will get this setup in a 600 size Ranger. You will need a Vario version.

I am fitting it in a 600 size EC145 which is much bigger in the doghouse and I have stacks of room
Peter Wales
http://scalehelicopters.org
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11-13-2012 02:49 AM  7 years ago
mrultralite

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abbotsford bc canada

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Peter, thanks for the response, you mean 600/700? , the term seems a bit loose. i may machine a new bearing mount and put the servos in the rear, maybe. Sometimes i think before i look.
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