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Robart Hinges

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Old 09-03-2010, 09:52 PM
  #1  
dutchy50
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Default Robart Hinges

G`Day
Am not sure what to do!!!!

Am building the Top Flite 1/7th scale P-51, and on the plans it shows the trailing edge of the wing has to be sandedso that is has a concave groove, and on the Flap leading edge it shows to sand this a convex shape.

How do you attach the Robart hinges so that there is only about a 1/16th gap when the flaps are installed at the downward position?????

Have tied this procedure on a trial piece of balsa and every time the flap is lowered on the demo the hinges pull out, leaving a gaping gap when the flap is back at neutral position!!!!

Have some photos of the plan attached!
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Old 09-03-2010, 11:46 PM
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Default RE: Robart Hinges

Does the plan or manual give you any hint or dimension?

The pivoting point of the Robart hinge must be located in line with the center of each of the two imaginary circles formed by the concave groove and the round LE of the flap.

Having no exact location shown on the plan, leaves you only with the option of trial and error.

For sure, the pivot line has to be deep into the LE of the flap.
In order to prevent the flap from hitting the hinge during deflection, one notch per hinge is needed.

Check the schematics for "Frise aileron" at Robart site:

http://www.robart.com/how_to/hinge_points.aspx
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Old 09-04-2010, 02:05 AM
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dutchy50
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Default RE: Robart Hinges

Lnewqban
Thanks for that information.
Have looked at the site you said and I think I now know how to go about installing the hinge. Like you said trial and error, I hope more trialing than erroring!!!!!I (I`m pretty sure thats not a word), Ah well!!
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Old 09-04-2010, 07:37 AM
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Default RE: Robart Hinges

Don't forget that you'll have to make vertical slots in the LE for the hinges to travel through
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Old 09-04-2010, 10:43 AM
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Default RE: Robart Hinges

Thank you, Mike!

Here you can find additional tips about the installation of Robart hinge points:

http://www.airfieldmodels.com/inform...ints/index.htm

Since the flaps only deflect downwards, the top of the slots shown in Mike's drawing, can be filled up with wood at the end of the installation, so they don't show up that much when flaps are deployed.

I would use some thin flexible shim between both surfaces during installation, in order to keep the gap constant and to avoid unnecessary friction in any position of the flaps.

Picture of final installation will be welcome.

Best luck with the project!
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