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Old 12-10-2013, 02:26 PM   #1
solentlife
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Default Retracts and fitting legs ...

I have these style servoless Retracts ... and they work nice ...

http://www.hobbyking.com/hobbyking/s...m_1pc_54g.html

Mine are a little smaller than those ... and I intend to fit 2 as main U/C on tail-dragger.

My question is this ... having had retracts before on a few models - I always had trouble keeping the wheels aligned and stopping the leg from turning in the mount. I tried grinding flats ... everything ..

So how do you guys keep your retracts from having legs turn ?

I want to fit either to my new Pattern flyer or if not enough depth in wing - to my Mig 3 ...

Nigel

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Old 12-10-2013, 04:50 PM   #2
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I do the same thing in terms of milling or grinding a flat with a Dremel tool. But I also grind the base of the grub screw flat. So , flat on flat.
-Hawk

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Old 12-10-2013, 05:35 PM   #3
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On my retracts I add a tiny bit of CA after the set screws are tightened, I then heat the leg a bit if I need to remove it.

My retract body is metal, so your mileage might vary with that method.

I use axles that slide onto the strut and attach with a set-screw, a drop of CA down the leg is a must with those.

Ask me why your DX5e is doomed... and how to fix it.
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Old 12-10-2013, 07:00 PM   #4
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Originally Posted by dahawk View Post
I do the same thing in terms of milling or grinding a flat with a Dremel tool. But I also grind the base of the grub screw flat. So , flat on flat.
-Hawk
Now never thought of that ... flat on flat ...

mmmm and CA - not my favourite ... but when needs must ...

Nigel

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Old 12-12-2013, 12:00 AM   #5
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The grub screws I have run into aren't pointy, and aren't flat, they look like a pointy cone that then has a hole drilled in the end, so the end surface that touches is a ring.

That makes sense for deforming metal a bit to help keep it tight, but flattening it would provide more resistance to torque deforming the mating surface and causing it to loosen.

Now if they could just fit a collet or a ring that tightened around the gear leg...

Ask me why your DX5e is doomed... and how to fix it.
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Old 12-12-2013, 12:07 AM   #6
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Originally Posted by solentlife View Post
Now never thought of that ... flat on flat ...

mmmm and CA - not my favourite ... but when needs must ...

Nigel
From my experience, CA and screws is permanent. If it should deform the metal and come loose, methinks there is no way to re-tighten it.

Be sure to really clean everything first with pure alcohol, not that 80% alcohol - 20% water stuff found in the local drug store.

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Old 12-12-2013, 07:23 AM   #7
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Originally Posted by kyleservicetech View Post
From my experience, CA and screws is permanent. If it should deform the metal and come loose, methinks there is no way to re-tighten it.

Be sure to really clean everything first with pure alcohol, not that 80% alcohol - 20% water stuff found in the local drug store.
My plan actually is probably Red Loctite ... or maybe test with Blue before committing to permanent stuff.

The retracts will rarely be used in fact ... most time be retracted and model hand launched. But I want them for when do the Public Shows at the airport ... and maybe other venues.

Nigel

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Old 12-12-2013, 02:21 PM   #8
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Whoah, no CA on the screws! Just a tiny bit where the strut enters the fitting... CA will loosen with heat easier than loctite. It gets nice and gummy at a fairly low temp.

Still might be a bit high for a plastic housing.

Ask me why your DX5e is doomed... and how to fix it.
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Old 12-12-2013, 02:54 PM   #9
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Phew !! was getting worried there !!

Shame I don't know the actual leg size for my e-tracts ... otherwise I'd order a nice pair of oleo sprung legs !! Couple of Tina Turner jobs !!

Nigel

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Old 12-13-2013, 10:47 AM   #10
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Just got these Oleos today for my BAE Hawk. They are really well made for only about $14. Not using retracts though. I just cut off the original legs a bit.
Gonna get some more for my little PC9

https://www.hobbyking.com/hobbyking/...dProduct=11300




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Old 12-13-2013, 10:50 AM   #11
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Yes ... nice - I've been looking at them myself ...

Nigel

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Old 12-28-2013, 03:05 PM   #12
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Originally Posted by solentlife View Post
My plan actually is probably Red Loctite ... or maybe test with Blue before committing to permanent stuff.

The retracts will rarely be used in fact ... most time be retracted and model hand launched. But I want them for when do the Public Shows at the airport ... and maybe other venues.

Nigel
Yep, they make many types of Loctite from removable (with some effort) to nearly a weld condition. Pick your application, been using the stuff for years and learned about it at work.
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