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HomeAircraftHelicopterThunder TigerRAPTOR 90 › G4, Sizing swash links
01-05-2014 05:50 PM  4 years agoPost 1
don s

rrElite Veteran

Chesapeake, VA

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How are you G4 owners sizing your links so that they are free on the swash balls, since there are no tools for swash balls of that size?

Mine are tight, squeaky tight.

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01-05-2014 05:58 PM  4 years agoPost 2
Ace Dude

rrProfessor

USA

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See response from Dr. Ben below.

  

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01-05-2014 11:07 PM  4 years agoPost 3
bobc1

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Southern California

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We have never sized any of the ball links on the four G4's we have built and flown.

My first G4 is 17 months old with 465 flights on it. I have only replaced the throttle and tail rotor balls/links about three times. All other balls/links are original.

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01-05-2014 11:14 PM  4 years agoPost 4
don s

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Chesapeake, VA

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Did the swash links start out tight? Do they move more freely after x number of flights?

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01-05-2014 11:32 PM  4 years agoPost 5
Adam Landefeld

rrApprentice

Lehi, UT, USA

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I do size my swash links in a DIY sort of way. I took one of the swash plate balls and cut a very clean/sharp sided 1mm groove into it then threaded it into a piece of aluminum stock I had around. I just pop this into new links and twist them around a few times and they are free as can be.

That being said, for many G4 builds before I did that process I just snapped them on and flew. They loosened up "some" over time and I never had any trouble with them. The reason I originally made my home-jobby reamer was I was trying to dial out a FBL bobble that ultimately ended up being a radial bearing in a blade grip but after seeing how nice I could get the links freed up I stuck with it.

Hope that helps,
-Adam

Futaba Factory Team
Team FlightPower
Thunder Tiger

https://www.facebook.com/UtahHeli

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01-05-2014 11:36 PM  4 years agoPost 6
bobc1

rrApprentice

Southern California

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The new balls/links are "snug" and do loosen up some after flying a while. With the exception of the tail and throttle, none of them seem to wear out.

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01-05-2014 11:55 PM  4 years agoPost 7
Dr.Ben

rrMaster

Richmond, VA, USA

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The posted quote came from me from a PM. Had I put it out here, I would have qualified a few things for a broader audience. It is far too easy for things to be taken out of context from posts sent in a PM that then end up on open forum.

The G4 links when new are on average too snug to allow the swash to center well. The will bed into a modest degree degree, but if the expectation is what Don Chapman used to call a "kissy smooth" fit, they will not reach that degree of creaminess without a link sizing no many how many flights are on them. Average amibient air temp is a player here too, so if you have a new G4 and then go fly on a day when it's 40D F outside, the links that were kinda tight at room temp get serious tight outside. For sport modeler flying 3D, the tightness of the stock link is OK. For more of a purist builder and certainly anyone choosing to compete in AMA/FAI contests, the links need to be loosened up a bit. Several months before the FAI WC's, Nick Maxwell was complaining to me that his model just wasn't sitting quite as well as it should. After sizing the 6mm links on my suggestion, the problem went away. There is nothing unique here to TT, either. Such practices are SOP for any new build. I found the OFNA ball trick to work well and with minimal risk for oversizing the links.

Ben Minor

Peak Aircraft/Team Minicopter Team Futaba Team Kontronik USA

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01-06-2014 01:40 AM  4 years agoPost 8
Ace Dude

rrProfessor

USA

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Thanks Dr. Ben. I'll be picking up a Ofna 6mm ball soon and will give this a try.

  

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01-06-2014 03:35 AM  4 years agoPost 9
don s

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Chesapeake, VA

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Found out how tight those links get in colder air today. Just trying to help the servos fight the good fight.

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