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Offline Motorman

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« on: October 18, 2018, 01:08:50 PM »
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« Last Edit: September 12, 2021, 09:26:22 AM by Motorman »
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Offline Randy Powell

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Re: Rib Spacing and Sheeting
« Reply #1 on: October 18, 2018, 01:47:06 PM »
Depends on the grain of your sheeting. 1" to 1.5" I would think.
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Offline Tim Wescott

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Re: Rib Spacing and Sheeting
« Reply #2 on: October 19, 2018, 09:30:20 AM »
Quote from: Motorman on October 19, 2018, 09:13:37 AM
I think it's B grain. Aren't most ribs about 2 1/2"?

Most sheeting is 3/32".
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Online Ken Culbertson

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Re: Rib Spacing and Sheeting
« Reply #3 on: October 19, 2018, 10:09:41 AM »
Quote from: Motorman on October 18, 2018, 01:08:50 PM
If you're sheeting a leading edge with 1/16th six Lb. balsa how close should the ribs be to prevent the starved horse look.

Thanks,
Motorman 8)
Maybe I am lucky because I have had healthy horses with a 2 1/2 spacing since I started using CA.   Ambroid and the whites shrunk as they dried.  I used to use 3/32 so I could sand out the ridges.  Now I use 1/16 cause I don't have to sand as much.  If the grain is right, you shouldn't get ridges but then I have no intentions of building a "front row" ship so I may just not see the distortion in the reflection.

Ken
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Offline Dave Hull

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Re: Rib Spacing and Sheeting
« Reply #4 on: October 19, 2018, 08:04:13 PM »
You didn't mention what you are putting over it. Plastic iron-on coverings don't seem to cause much "starved horse," but doped polyspan sure can.

Dave
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Offline Air Ministry .

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Re: Rib Spacing and Sheeting
« Reply #5 on: October 19, 2018, 08:46:36 PM »
Bahh . !

The . 077 Sheet is really 2 m m , out here its all metricated now . Besides being apalling growin & milling .
ANYWAY ,

Ive been using a piece of plastic downpipe , NON SHRINK Dop , Two Coats .

FIRST , Block Sand shhet outer face on bench . Then Dope . Then Block Sand Again . Then . . . Roll Onto 3 3/4 in ?? plastic tube .

A pile of rubber bands & a stick down each edge . Or Cardboard over it . LIKE MOULDING you get bleedy great whelts , from the rubber bands
IF YOUR NOT CAREFULL .

The Theory behind this , IS the curve is tighter than the rib curve , fitted . So it bulges OUT at between the ribs .  mw~ LL~ :## ;)

Actually - seems to stay pretty flat , unsunk , unsagged .

HOW MUCH of this is due to NOT having to do more than token sanding ( With a FOAM BLOCK - cut from a chilly bin - greengrocer type )
after fitting , which gets the thiness all out of whack , is anyboys guess . ( Not Really ) Can even get a 12 in stick with 220 - 320 paper ,
and it stays in contact along its length .

Used this on about for now . The one that wasnt didnt and was a paIN .

From ' off the stack ' you can put it on the tube , overnight . Or after a few days , sand it ON THE TUBE ( for support - curved )
so its pretty much ' flatted off ' to the curve - BEFORE fitting to the ribs . There ya Go .  H^^
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Offline Avaiojet

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Re: Rib Spacing and Sheeting
« Reply #6 on: October 19, 2018, 08:51:06 PM »
Half ribs.
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Offline Mike Griffin

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Re: Rib Spacing and Sheeting
« Reply #7 on: November 03, 2018, 06:16:28 PM »
Walter, I will add my 2 cents worth here and that is probably about all it is worth.  When I am scratch building a wing I prefer using 3/32 thick ribs, spaced 2" apart and I use a little harder 1/16 balsa for the leading edge sheeting because I got tired of putting my thumb through the really soft stuff.  Using this method I never get the "starved horse" look.     I rarely use 3/32 for leading edge sheeting. 


Mike
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