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Building Tips and technical articles. => Building techniques => Topic started by: Motorman on February 04, 2016, 09:17:00 AM

Title: Gang Sanding (Ribs)
Post by: Motorman on February 04, 2016, 09:17:00 AM

Is there a way to stack geodetic ribs and sand them all together if the wing has a tapered leading edge and tapered in thickness and there are 6 straight ribs in the center section?

Thanks,
MM

Title: Re: Gang Sanding (Ribs)
Post by: Brett Buck on February 04, 2016, 10:57:27 AM

Quote from: Motorman on February 04, 2016, 09:17:00 AM

Is there a way to stack geodetic ribs and sand them all together if the wing has a tapered leading edge and tapered in thickness and there are 6 straight ribs in the center section?

Thanks,
MM

   No practical way, without the lost foam core. The lost foam system essentially does the same thing one rib at a time. If all you have are the ribs, then wait until it is assembled, and in the jig, then use a long sanding block to sand them even. Use relatively coarse paper with very light pressure and just enough time to get them even.

     Brett

Title: Re: Gang Sanding (Ribs)
Post by: Lauri Malila on February 05, 2016, 07:38:58 AM

I have allways made the ribs & glued them in place oversized, just adjusted the lenght correct.
Then sanded them true with a long, straight sanding block and plywood templates in both ends of wing panel. I like it because it gives a perfect contact between the ribs and sheeting.
But I have not used diagonal ribs, maybe it will be more difficult. Even with normal ribs you must be very carefull.

Lauri

Title: Re: Gang Sanding (Ribs)
Post by: Gerald Arana on February 05, 2016, 10:37:50 AM

Quote from: Lauri Malila on February 05, 2016, 07:38:58 AM

I have allways made the ribs & glued them in place oversized, just adjusted the lenght correct.
Then sanded them true with a long, straight sanding block and plywood templates in both ends of wing panel. I like it because it gives a perfect contact between the ribs and sheeting.
But I have not used diagonal ribs, maybe it will be more difficult. Even with normal ribs you must be very carefull.

Lauri

Even with utmost care I can manage to break every (well most) rib at least once!  LL~ LL~ LL~

I built a Shark 402 and yes! I broke almost every rib! Thanks to hot stuff you couldn't tell.........

Keep sanding, Jerry

Title: Re: Gang Sanding (Ribs)
Post by: john e. holliday on February 05, 2016, 08:10:11 PM

Doesn't Bobby Hunt show this on one of the lost foam video's?  Especially if you use molded leading edges.