Basil Posted December 18, 2021 Share Posted December 18, 2021 Sometime in the last couple of years I came across a list of various woods used for modelling, detailing the size, type and main uses together with thier wieghts. I have tried to find it but without success. Can any body point me in the right direction. From memory it was put out by supplier, for interest, or a fellow builder!! Bas Quote Link to comment Share on other sites More sharing options...
kc Posted December 18, 2021 Share Posted December 18, 2021 (edited) You just Google - Balsa + weight and you find the answer! To save anyone else the trouble the Sig site has the table and lots more info on balsa. The info is somewhat out of date in some respects - the balsa we get now in Britain comes from Papua New Guinea as well or instead of South America. Edited December 18, 2021 by kc Quote Link to comment Share on other sites More sharing options...
Basil Posted December 19, 2021 Author Share Posted December 19, 2021 Many thanks KC. I am sure I can get what I want from there, what I saw was similar. Has anyone an idea of what poplar and Obechii veneer wieghts are like? Once again KC to the rescue. Thanks Bas Quote Link to comment Share on other sites More sharing options...
kc Posted December 19, 2021 Share Posted December 19, 2021 (edited) The weight of veneer depends on it's thickness of course. Marquetry veneer is often .6mm or .8mm ( approx 1/32 inch ) but veneer for other purposes might vary a lot. I think the veneer used for foam wings in the past was about 1/64 inch thick. Obeche is about 24 pounds per cubic foot. Poplar is about 28 lb cu ft. Most timber varies in weight but nothing like as much as balsa. The Sig table gives various weights per cu ft for balsa of different grades so you could take the 12 lb cu ft column for each size and halve the size ( or double the weight ) so it applies to the 24lb cu ft of Obeche. So a 4 inch by 36 inch sheet ( = 1 sq ft ) weighs .500 oz ( 1/2 oz ) in 1/32 balsa 12 lb cu ft then you would expect 1/ 64 obeche to weigh the same. You could say Obeche is approx twice the weight of medium balsa. But the weight of veneer is less significant than the weight of the glue used to apply it to foam wings. Lots of wing area = lots of heavy glue such as latex ( Copydex etc ) or epoxy and any fibreglass etc bandage and epoxy adds further weight too. Anyone making a foam wing today might economise on veneer and glue by using the method used by Avicraft on some of their old foam wing designs like Moronic. They used just veneered LE and TE with capstrips plus fully veneered centre section in a similar manner to many built up wings. Works well. Today I think Avicraft use balsa built up wings on their kits. Edited December 19, 2021 by kc Quote Link to comment Share on other sites More sharing options...
kc Posted December 19, 2021 Share Posted December 19, 2021 There is a printable weight page here - not as much info as Sig but prints on one A4 sheet and shows weights in grams which is more useful if you have digital kitchen scales. Quote Link to comment Share on other sites More sharing options...
Basil Posted December 20, 2021 Author Share Posted December 20, 2021 Once again, saved by KC. Many thanks , Seasons greetings and thanks for your many contributions to our hobby. Bas Quote Link to comment Share on other sites More sharing options...
kevin b Posted December 20, 2021 Share Posted December 20, 2021 Hi Bas. Try googling "wood density chart". It comes up with a lot of results including the woods we use. Quote Link to comment Share on other sites More sharing options...
Basil Posted December 20, 2021 Author Share Posted December 20, 2021 Martin, did I really put 'Medelling'? Bas Quote Link to comment Share on other sites More sharing options...
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