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Old 09-22-2013, 12:36 PM
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Mounting Stabs Sucks

I have looked high and low for ideas to make putting the stabs on my airplane better. I hate all the time it takes. I hate that I need tools and that all the linkages are in the way of those tools and my hands. I hate dropping tiny screws in the grass. Someone should just solve this. If I were designing the airplane from scratch I would have more options but trying to retrofit something around a 3mm/4-40 bolt is really, really hard.

The best thing that I have come up with are these thumb screws from McMaster: http://www.mcmaster.com/#98704a120

They call it a "Plastic-Head Thumb Screws with Socket Drive". I haven't found the socket drive necessary but its nice to have. I add a small bonded washer (ass seen in the photo) and I get a nice vibration resistant thumb screw that I can use with no tools. They don't offer metric which is really disappointing. SFGs and canopy bolts are often M3 to work with those little plastic thumb screws.

But it would be nice if no screws were involved at all!

I've found a source of small locking quick release pins: http://www.rcbooya.com/
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They are 1/4" diameter. That means you would have to drill out the 'ears' on the stabs and then glue some kind of custom socket (made from phenolic tubing?) into the airframe. I haven't gotten brave enough to hack up one of my airplanes and try it.

If the airplanes were designed for this from the factory that would really be much better.
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Old 09-22-2013, 09:07 PM
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If towing is the problem get the trailer frame from harbor freight and put a cheap trailer together.
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Old 09-22-2013, 11:00 PM
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Actually storing the trailer is the problem now that I live and work in the city. The trailer can be where I live. Planes are not near the workshop when I need to do work etc. A trailer is a really expensive way to solve this problem!!!

My Rav 4 moves my 100cc around just fine. The stabs just need to come off and go on with as little trouble as the wings do.
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Old 09-22-2013, 11:55 PM
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You could mod a bike wheel quick release. You would have to put an aluminum sleeve across the fuse for support. Then slide the pin through securing both stabs, put on the nut and clamp down the quick release. They sell titanium ones which would weigh less.
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Old 09-23-2013, 02:17 AM
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Quote:
Originally Posted by crash-n-burn View Post
You could mod a bike wheel quick release. You would have to put an aluminum sleeve across the fuse for support. Then slide the pin through securing both stabs, put on the nut and clamp down the quick release. They sell titanium ones which would weigh less.
Thats an interesting idea. My initial reaction is that the fuselage is usually not square. They have these things like that called "expanding quick release" but I cant find one in 3mm or 4-40.

I just modded the 78" Extra to have 4-40 hardware so at least I can use the thumb screws.
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Old 09-23-2013, 02:11 PM
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This works excellent for applications like yours. Very cheap also.
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Old 09-23-2013, 03:45 PM
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Quote:
Originally Posted by ericb View Post
This works excellent for applications like yours. Very cheap also.
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Old 09-23-2013, 04:15 PM
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ok
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Old 09-24-2013, 12:12 PM
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2.6m Comp ARFs can be built with only one bolt that needs removed in the tail. I can have mine totally assembled in about five minutes with 5 screws that need a tool. Less than that if my wife hands me the pieces for me to assemble. I hear you on the trailer. Transport my 35% in a CRV.
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Old 09-24-2013, 01:11 PM
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McMaster Carr does have 3MM Thumb screws up to 16mm, with or without a shoulder. Unfortunately the ones they have available don't allow for access with an allen wrench but I usually can get them plenty tight enough with just my fingers.

Here is a link: http://www.mcmaster.com/#92581a150/=ondsuy
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Old 09-25-2013, 10:21 AM
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Heres's another thought....push button releases for tubing;

http://www.mcmaster.com/#push-button...e-pins/=onu337

One in each end of the CF tube. Button located on the bottom of each stab at the outer end of the tube socket. You'd need to replace your foward retainer screw (or both) with an anti-rotation pin(s).

Also, depending on the thickness of the airfoil, one might need to create a recessed hole to stick your finger in to reach the button.

I've thought about this, but haven't tried it....yet.
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Old 09-26-2013, 05:50 PM
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Thats a neat idea!

Are you concerned about getting the stabs to fit snugly against the fuse? Also minimum tubing diameter is 1/2", I think some ARFs might have smaller tubes than that.

Still the idea is pretty interesting...
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Old 09-27-2013, 11:10 PM
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Or you can try these:
http://store.aztechaeromodels.com/st...product_id=355
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Old 09-29-2013, 04:23 PM
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Secraft also make these:
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http://store.aztechaeromodels.com/st...&product_id=88

And these:
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http://www.secraft.net/shop/step1.php?number=1319

Both M3, so that would have saved me some work. I swapped the nuts in my airplane for 4-40's
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Old 10-01-2013, 08:41 AM
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Take a look at the J'tec/Radiowave 3.1 build - Jerry Hailey uses quick release 1/4 turn Camlocs to hold his stabs on. Still need a screwdriver I think though. See here:

https://www.flyinggiants.com/forums/...&postcount=203

Pete
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