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Home✈️Aircraft🚁HelicopterMiniature Aircraft Whiplash & Fury 55 › FAI tail slider binding...
09-10-2006 04:26 AM  14 years ago
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THX1138

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Indianapolis, IN

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FAI tail slider binding...
I have the FAI tail slider on my Stratus and I am getting some binding in the travel. I noticed it the on the second flight when I was trying to set the tail rotor bias.

I have not had a chance to work on it till this evening. I removed the the tail hub and slider and cleaned the inside of the brass slider. After that, I cleaned the tail shaft. I checked the motion again and it was still a little stiff. I grabbed a peice 400 grit sand paper and started to work on the tail shaft. After a couple of passes I checked the motion again and it was silky smoove.

When I mounted the slider to the gear box and checked it again, the binding was still there. I lossened the bolt that holds the slider mounting post to the slider and the binding is gone. When I tighten up the bolt where it should be the binding comes back.

What do I need to do?

Lou
Just give me five dudes and two flashbangs...
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09-10-2006 03:25 PM  14 years ago
Dr.Ben

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Richmond, VA, USA

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Grab he tail, one blade tip in each hand, and pull straight out. Now rotate the blades about their radial axis. You shouldn't feel that bump anymore. When you're feeling is sometimes present on new FAI tails before the parts bed in. It's most likely occurring at the articulation point between the yoke and the delrin donut. OCCASSIONALLY it will happen if the piutch arm is mismachined. You can spot that problem by slightly loosening its mounting screw and then seeing if the problem eases.

Ben Minor
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09-10-2006 04:49 PM  14 years ago
THX1138

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Indianapolis, IN

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I just loosened the bolt a little bit (still two threads showing) and it has eased the binding some but it is still not smooth. You can feel a slight "catch" when I move the slider by hand.

Will this go away on its own or do I need to order a new slider? The "catch" is slight but it is noticable. Is it safe to fly or not? I think this is also giveing my gyro some minor fits too.

Lou
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09-11-2006 01:17 AM  14 years ago
THX1138

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Indianapolis, IN

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Any body?

Lou
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09-11-2006 06:12 PM  14 years ago
Dr.Ben

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Richmond, VA, USA

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I would be inclined to retighten the bolt and put a few gallons through the model. Go back and check it along the way. It should bed in over that time. If it doesn't the first part that I would suspect is the arm that mounts the slider yoke to the tail box.

With that small a bind, I see no safety issue here.

Ben Minor
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09-11-2006 06:59 PM  14 years ago
THX1138

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Indianapolis, IN

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The bind is minor, but it is making my gyro have the fits. It is enough of a bind that I can feel the catch when I move the slider by hand.

Lou
Just give me five dudes and two flashbangs...
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09-11-2006 07:19 PM  14 years ago
Dr.Ben

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Richmond, VA, USA

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Do you feel the bind at a tail pitch angle consistent with where the model sits in hover? You can confirm this point by trimming the tail out hands off with the gyro set in rate mode.

Ben
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09-12-2006 03:41 PM  14 years ago
THX1138

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Indianapolis, IN

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The binding is gone. I will test fly her again as soon as the weather clears up.

Thanks to everyone for the PM's and Email's.

Lou
Just give me five dudes and two flashbangs...
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09-12-2006 05:45 PM  14 years ago
Dr.Ben

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Richmond, VA, USA

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For purposes of learning and teaching for those who have been following your thread, what did you do to resolve the problem? I'm assumming it didn't fix itself.

Ben Minor
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09-12-2006 06:47 PM  14 years ago
THX1138

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Indianapolis, IN

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I sent an email to Eric Larson and his advice worked out for me.

I ended up having to "tweak" the post (p/n 122-74) with a crescent wrench. It took a couple of tries and I got it perfect. It is notedly smother than before.

Lou
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09-15-2006 02:31 AM  14 years ago
m60e3

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Towson, MD

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Which way did you tweek it? I think my tail has the same problem as it's not as silky smooth as others I have owned.

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09-15-2006 02:35 AM  14 years ago
THX1138

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Indianapolis, IN

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I put the crescent wrench on it strait from the back and pulled up. This in turn twists the post downwards. This was a total guess on my part and yours may be opposite. I can tell you that it does no take a lot of pressure at all so be cool.

Lou
Just give me five dudes and two flashbangs...
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09-15-2006 03:10 AM  14 years ago
m60e3

rrApprentice

Towson, MD

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Ok, I will look at mine and see which way it needs tweeking. It is perfectly smooth until I tighten the bolt at the pivot point. Which way is your bolt head facing, up or down?

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