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Old 03-30-2012, 08:09 PM   #1
dpinvidic
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Default Any suggestions on reinforcing the landing skid mounting tabs

The most likely reason for frame replacement (for me anyway) has been broken tabs on which the landing gear struts mount. Has anyone come up with a trick to reinforce these tabs so they don't break as easy.

I was even considering putting saw cuts in the white plastic landing gear struts just so that they would break easier and save the frame. It is just so much work to transfer everything to a new frame.

Thanks,

Dan
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Old 03-30-2012, 08:24 PM   #2
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NEVER MIND...Finaly got a good search result and found some old threads....
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Old 03-30-2012, 08:43 PM   #3
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Glad you found the old threads.

I don't know which you found so I'll post a couple ideas.

To repair the frame when broken in the front, I've done this to give it more life until the frame needed changing:

http://www.helifreak.com/attachment....8&d=1256320770


http://www.helifreak.com/attachment....7&d=1256320770


http://www.helifreak.com/attachment....6&d=1256320770


Then covered the zip ties with epoxy or shoe goo would work too.

http://www.helifreak.com/attachment....0&d=1256320807


http://www.helifreak.com/attachment....9&d=1256320770


To prevent tabs from breaking off, just use zip ties so the zip ties fail before the tabs do (usually).

May need to slightly enlarge the holes in the skids to be the zip ties to work. These are Trex 500 skids but this works on stock skids too.


http://www.helifreak.com/attachment....2&d=1256319101


http://www.helifreak.com/attachment....0&d=1256319101


http://www.helifreak.com/attachment....9&d=1256319101


http://www.helifreak.com/attachment....4&d=1256319143

Sorry, the photos were not taken to specifically show the zip ties but you get the idea.

Mike
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Old 03-31-2012, 04:29 AM   #4
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I've been wondering about this as I don't fancy trying to replace a frame. I've seen racing cars where the rear wing (fender) is attached with nylon bolts rather than metal ones so that they break on impact rather than ripping the bodywork. I wonder if we could do the same with the B400's landing gear bolts? What size are they?
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Old 03-31-2012, 10:18 AM   #5
dpinvidic
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Default Good idea

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Originally Posted by Andrew73 View Post
I've been wondering about this as I don't fancy trying to replace a frame. I've seen racing cars where the rear wing (fender) is attached with nylon bolts rather than metal ones so that they break on impact rather than ripping the bodywork. I wonder if we could do the same with the B400's landing gear bolts? What size are they?
.

You would need to drill the skid struts for 2mm. but can you find 2mm nylon screws.
2/56 is a touch larger, but you might have better luck finding them in nylon.

But along this line of thought...how about mounting ball studs in the tabs, pointing down. Then drill a tight fitting hole in the landing skid. If you could get a "snap on" skid, that might be the answer. It just has to stay on in flight...maybe tie some monofiliment line to hold it together. Just a wacky thought....

Dan
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Old 03-31-2012, 10:23 AM   #6
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Default Do the zip ties break first

Quote:
Originally Posted by TowPilot View Post
Glad you found the old threads.

Sorry, the photos were not taken to specifically show the zip ties but you get the idea.

Mike
How have the zip ties worked out after a crash? I thought they were pretty strong, do they break before the tab does?
Thanks for the Pic... they gave me some ideas on wire routing.

Dan
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Old 03-31-2012, 10:45 AM   #7
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I use 2mm nylon screws so they shear off
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Old 03-31-2012, 11:05 AM   #8
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+1 I use cheap 2.5mm zip ties I got off ebay. They always break before that tabs do. If you can find 2mm that should be even better.
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Old 03-31-2012, 11:59 AM   #9
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Something like this? They are 2mm by 10mm. Has anyone crashed with nylon bolts who can confirm they break first?
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Old 03-31-2012, 12:50 PM   #10
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Default I am going to try this

I was lazy this morning, so I just drilled a couple of 3/32 holes in each strut. The hope is that the strut will break first. But I also ordered some 2mm zip ties. If the ties usually break first, it will save both the strut AND the tab.
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Old 03-31-2012, 01:40 PM   #11
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Quote:
Originally Posted by dpinvidic View Post
How have the zip ties worked out after a crash? I thought they were pretty strong, do they break before the tab does?
Thanks for the Pic... they gave me some ideas on wire routing.

Dan
I've never lost a tab or skid due to the zip ties not breaking.

Use the smaller zip ties for easy of installation due to drilling out the holes in the skids and to assure the zip tie will break.

I worried about that too when I was first told about zip ties.
The idea came from someone in Australia.

While you can't break the zip tie easily pulling on it, they seem to shear readily on impact.

Monofilament line would work too.

The nylon bolts might not shear as easily.
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Old 04-04-2012, 10:37 AM   #12
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I've installed the 2mm nylon bolts, nice easy mod just had to drill out the holes on the landing gear. Feels nice and secure but the bolts seem quite breakable. I doubt it will be long until we find out if they work!

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Old 04-04-2012, 08:27 PM   #13
dpinvidic
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Default Very clean...

Quote:
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I've installed the 2mm nylon bolts, nice easy mod just had to drill out the holes on the landing gear. Feels nice and secure but the bolts seem quite breakable. I doubt it will be long until we find out if they work!
Very nice job....
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Old 04-04-2012, 10:58 PM   #14
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Smile 2mm nylon bolts

Had my B400 for 2 Years have not replaced the main frame as of yet. Do have 500 skids on it. Do not know if it makes a diff, but I had the B400 skids on it untill last year and no broken tabs. You know I just jinxed myself with this post.
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Old 04-04-2012, 11:13 PM   #15
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Get a set of Protos 500 Skids, Not as large and ugly looking as Align skids and more flexible

Here's mine
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Old 04-10-2012, 09:55 PM   #16
dpinvidic
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Default OUTSTANDING SUGGESTION...THANKS!!!

Quote:
Originally Posted by TowPilot View Post
I've never lost a tab or skid due to the zip ties not breaking.

Use the smaller zip ties for easy of installation due to drilling out the holes in the skids and to assure the zip tie will break.

I worried about that too when I was first told about zip ties.
The idea came from someone in Australia.

While you can't break the zip tie easily pulling on it, they seem to shear readily on impact.

Monofilament line would work too.

The nylon bolts might not shear as easily.
Well, got the zip ties from e-bay yesterday, and put them on tonight. I had thought it was a good idea, but now that they are on, it looks like it will be perfect.

The 2mm ties are not that strong....but plenty strong to keep the sikds on....I hate to say this, but I am "Almost" looking forward to testing it.....

By the way, in a crash last week, I broke both skids becasue I had drilled holes to weaken the skids...so that worked OK, at the cost of new skids.
But this is WAY better....

Thanks Again.

Dan
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