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http://www.avonflyers.ns.ca/cgi-bin/Forum/yabb2/YaBB.pl Avon Radio Control Flyers Discussion Area >> Working on a Project? >> Serious Retract Question. http://www.avonflyers.ns.ca/cgi-bin/Forum/yabb2/YaBB.pl?num=1524253686 Message started by Fingers on Apr 20^th, 2018 at 3:48pm

Title: Serious Retract Question.
Post by Fingers on Apr 20^th, 2018 at 3:48pm

While getting the ESM Hurricane ready, I noticed the retracts seem to have a lot of slop. don't remember that from when I flew it last.
The struts, when down, have about 1/2" (1 cm) back-and-forth to them at the wheel. Is that about right? Do expensive gear like Robart have that slop? If too much, can the slop be taken out and how??

Title: Re: Serious Retract Question.
Post by al on Apr 20^th, 2018 at 10:01pm

Pour some epoxy in that mechanism Sandy, lots of epoxy. lol

Title: Re: Serious Retract Question.
Post by Glen on Apr 21^st, 2018 at 7:38am

I like it, that'll stiffen up those moving parts for sure ;D.

On a semi serious note, some retracts have adjustments, some don't. Have a look Sandy and see if there's some set screws.

Title: Re: Serious Retract Question.
Post by Fingers on Apr 21^st, 2018 at 2:11pm

No set screws Glen. The slop is right at the mouth of the trunion block, where the slot opens to accept the bar from the cylinder. Bar is out just a smidgeon too far so it slops.
I CAN put shim stock or very thin washers on the pin holding the trunion, that will help a tad.

Title: Re: Serious Retract Question.
Post by Yak Man on Apr 22^nd, 2018 at 5:06am

The metal used in ESM gear is so soft that all you can really do is squeeze it back together and hope. Of course the more you do that the weaker it gets. Also of you squeeze it to much the gear will stick.

Title: Re: Serious Retract Question.
Post by Fingers on Apr 22^nd, 2018 at 10:25am

Yak Man wrote on Apr 22^nd, 2018 at 5:06am:

[smiley=tekst-toppie.gif] Try that I will..gently

Title: Re: Serious Retract Question.
Post by Glen on Apr 22^nd, 2018 at 2:33pm

Sounds like a job for a 6" vice and a strong arm :D
That'll fix those esm retracts for sure.

Title: Re: Serious Retract Question.
Post by Fingers on Apr 22^nd, 2018 at 2:44pm

mmmmm I was thinking 5 pound hammer and a 6" vice....

Title: Re: Serious Retract Question.
Post by Yak Man on Apr 23^rd, 2018 at 5:16am

Or a little chunk of C4! ::)

Title: Re: Serious Retract Question.
Post by Fingers on Apr 23^rd, 2018 at 8:03am

Now THAT I ha.......mmmmmmmmmmmmmmmmmmm :)

Title: Re: Serious Retract Question.
Post by Fingers on Apr 23^rd, 2018 at 9:02pm

Still no set screws, as I determined before, but I WAS wrong on where the slop is. Not at the mouth of the trunion block!! :-[ Good guess, but upon further examination, I found that when the gear is down, the back of the block comes up against a stop pin. So the block is held verticle by the rod in the pneumatic rod rising in the slot of the block, which goes to an over center, PLUS there is a cross pin that the trunion backs up against.
The pic shows the pin, and the block, and you can see the small gap. I have some brass shim stock that mic's about .1mm, and I can get 2 layers through the gap without affecting either up or down. but the slop remains... >:( :P :'(

gear_1_01_001.JPG (125 KB | 242 )

Title: Re: Serious Retract Question.
Post by Yak Man on Apr 24^th, 2018 at 6:04am

That I can help you with. Just a matter of cutting an over sized pin. Or could knurl the existing pin.

Title: Re: Serious Retract Question.
Post by Fingers on Apr 24^th, 2018 at 7:08am

Than I WILL call you for assistance kind sir. :)