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Building Tips and technical articles. => Building techniques => Topic started by: Motorman on October 18, 2018, 01:08:50 PM
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Depends on the grain of your sheeting. 1" to 1.5" I would think.
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I think it's B grain. Aren't most ribs about 2 1/2"?
Most sheeting is 3/32".
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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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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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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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Half ribs.
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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