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Steerable nose wheel set up

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Chris Walby02/04/2019 12:35:34
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943 forum posts
226 photos

Hi,

I have previously used some HK nose wheel retracts with a slotted plate with not a great deal of success and was looking at this. Okay it a much larger version, but it’s the principle of two ball joints that interests me.

nose retract.jpg

That was until I tried to work out how you configure a ball and rod to rotate 90 degrees with the minimum of play, or do you just use wire?

If anyone has set these up successfully could they post a couple of photos or explain. Cheers Chris

Mike T02/04/2019 13:23:18
404 forum posts
28 photos

Closed loop. The steering wires go taut when the leg is fully down. As pictured, the wires go to the left, to the servo. If you wanted a forward retracting leg, you'd need some kind of turn-around for the wires in the front fus.

Chris Walby03/04/2019 06:31:33
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943 forum posts
226 photos

Thanks Mike, Its intended to be fitted with the retract leg travelling up and back.

I didn't know the only option was wire and how they connect to the ball joints. I was thinking of rods and stops through a steering arm on the servo.so once the retract is down there is little play.

Come on...someone must have a photo or two laugh

Frank Skilbeck03/04/2019 08:13:54
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4423 forum posts
101 photos

I've used closed loop wires on a retractable noseleg, but I can't see how that works with ball links as shown in the photo. Where the mating parts for the ball links provided?

Denis Watkins03/04/2019 08:40:20
3741 forum posts
179 photos

From the interweb, closed loop

dscn2613.jpg

Josip Vrandecic -Mes03/04/2019 09:57:43
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2983 forum posts
259 photos
 
sorry mods error.

 

 

 

 

Edited By Josip Vrandecic -Mes on 03/04/2019 10:00:45

Edited By Josip Vrandecic -Mes on 03/04/2019 10:01:14

Chris Walby03/04/2019 10:15:40
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943 forum posts
226 photos

Weirdest nose wheel I have seen, is this part of the backwards flying group?

If not its off topic I think wink

Denis Watkins03/04/2019 10:18:58
3741 forum posts
179 photos
Posted by Chris Walby on 03/04/2019 10:15:40:

Weirdest nose wheel I have seen, is this part of the backwards flying group?

If not its off topic I think wink

Sorry kids, was trying to help, will not interfere again

Chris Walby03/04/2019 10:22:21
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943 forum posts
226 photos

Dennis, no need to be upset, yours has been the most useful post yet smiley

Denis Watkins03/04/2019 12:13:47
3741 forum posts
179 photos

Thanks Chris, I just got back in

And you are right, it does appear to run backwards

The leg is forward folding on a Canard

But it does illustrated the closed loop set up

Chris Walby03/04/2019 12:22:03
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943 forum posts
226 photos

Apologies Dennis, my comment was not directed at you, but JVM's post that has since been modified as it showed a very nice tail wheel modification.

The interesting thing with your post is the use of two servos to get sufficient clearance with the wire and the retract. Certainly better that my attempts with the HK single arm type where it either had lots of play or would bind between retract operations.

Thanks for your time its appreciated.

Nigel R03/04/2019 14:10:05
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2930 forum posts
470 photos

You could use some snake inners to creatively route the closed loop?

Chris Walby03/04/2019 15:06:53
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943 forum posts
226 photos

I could understand if the ball joints protruded out of the ends of the oleo arm. Okay it would give limited steering movement, but it would allow the retract to rake back and the ball joint link to rotate.

Thanks to all contributions

Denis Watkins03/04/2019 15:32:08
3741 forum posts
179 photos

Someone has used cable here on the ball link

But I bet a folding rod could be made up

tf_b-25j_0366.jpg

Mike T07/04/2019 01:39:03
404 forum posts
28 photos

...

Edited By Mike T on 07/04/2019 01:44:33

Martin McIntosh07/04/2019 18:02:03
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2874 forum posts
1062 photos

The only way I could get the cheap and nasty HK unit on my Hawk to fold forwards was to use two servos in front of it connected with wires.martin`s hawk 025.jpg

Not very pretty.

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