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French Balsa designations on Plans

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Tim C11/01/2017 10:12:29
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534 forum posts
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I am building a Slope Glider from plans out of the French Looping Magazine.

The Plans use Balsa designations such as 20/10 and 30/10, what do they mean? I assume thickness and density. I can make out most of rest the detail from my schoolboy French

brokenenglish11/01/2017 10:17:47
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Think of it as "tenths of a millimetre".

20/10 is 2mm, 30/10 is 3mm

It's a traditional French method of expressing sheet thickness (it's not used for strip), and it's not only balsa either, it's also used in engineering for metal plate thickness.

Bob Burton11/01/2017 10:40:55
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Posted by brokenenglish on 11/01/2017 10:17:47:

Think of it as "tenths of a millimetre".

20/10 is 2mm, 30/10 is 3mm

It's a traditional French method of expressing sheet thickness (it's not used for strip), and it's not only balsa either, it's also used in engineering for metal plate thickness.

Tenths of a millimetre ? Micro modelling at its best !

Tenths of a centimetre perhaps ?

Don Fry11/01/2017 10:47:12
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Doing my head in actually thinking about it, but brokenenglish is right. A weird concept, but so is some of the cuisine, but tastes fine.

brokenenglish11/01/2017 10:49:10
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No Bob, tenths of a millimetre, i.e. 30 tenths = 3 (of anything), but in this case it's millimetres... OK?

McG 696911/01/2017 11:34:09
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Hi to all,

Brokenenglish is right here.

It was originally used for thin high quality sheet metal, with the thickness expressed in tenths - 'dixièmes' - of a millimeter.

As said "30 tenths" (30/10) of anything equals 3... well, it does in Belgium anyway... wink

Cheers

Chris

 

Edited By McG 6969 on 11/01/2017 11:35:12

David Davis11/01/2017 12:14:10
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Quite so.

When they want to refer to the size of strip, they use an X in the middle of the numbers. For example 6X6 is 6mm by 6mm. At least, that is what is printed on my Baron1914 plan, which is a model as well-known in France as a WOT 4 is in England. They are rather different models mind!

For those who have difficulty with the metric system, 3mm is about 1/8", therefore 6X6 is the equivalent of 1/4" square.

Tim C11/01/2017 13:03:21
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534 forum posts
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OK, Thanks,

One other thing, on the plan is shows two jig templates one at 45deg (for the Winglets) and one at 1deg? , but cannot make sense of the French Gabarit pour Diedre de l'aile, any ideaswp_20170111_12_55_15_pro[1].jpg

Max Z11/01/2017 13:10:32
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MPosted by Tim @ ModelMarkings.com on 11/01/2017 13:03:21:

but cannot make sense of the French Gabarit pour Diedre de l'aile, any ideas

= Template for the wing dihedral.

Max.

McG 696911/01/2017 13:26:24
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Hey Tim,

Max is absolutely right.

"Template for the wing dihedral > 1°"

"Template for the winglet dihedral >45°"

If you have any other 'dark' zones, please post them here, as that's we're here for, I guess.

Cheers

Chris

Edited By McG 6969 on 11/01/2017 13:26:54

Ernie11/01/2017 16:22:09
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2544 forum posts
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Gabarit pour diedre d'aile

Template for wing dihedral...Caution is advised re metric and UK thread sizes..They nearly match, but not quite

ernie

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