Hi All,

There seems to be some debate on here over the Hobbycraft foam board available in the UK and how much heavier it seems to be than the stuff the yanks get.

I brought a few sheets from Hobbycraft on Friday after watching a few scratch build based videos at work but before I signed up and looked at the forum. I have just done the maths on how much they weigh in comparison to the quoted size on the Flite test site (http://flitetest.com/support under the general questions section). The board I Purchased from HC is I believe this stuff http://www.hobbycraft.co.uk/hobbycraft-a1-white-foamboard/539724-1000 it was on offer as well

Being from England I am going with the metric system (because the rest of the world uses it America ) and shall convert to metric accordingly.

A sheet of the FT dollar tree foam is 20" x 30" x 0.17" and weighs 4.4oz according to their site. In real money this is 50.8cm x 76.2cm x 4.318mm and weighs 124.738 grams.

This is very close to the size of a sheet of A1 59.4cm x 84.1cm (http://en.wikipedia.org/wiki/Paper_..._size_illustration2_with_letter_and_legal.svg)

which is the size of the board that Hobby craft sell.

Working out the area of each we get an area of:

50.8cm * 76.2cm = 3870.96 cm[SUP]2[/SUP] for the DTFB

59.4cm * 84.1cm = 4995.54 cm[SUP]2[/SUP] for the HC A1 foam board

The difference in size is about 29%

(4995.54cm[SUP]2[/SUP] - 3870.96cm[SUP]2[/SUP]) / 3870.96cm[SUP]2[/SUP] * 100 = 29.0517081%

So we would need the weight of an A1 HC sheet to be 160.9765197 grams to match the DT foamboard for the given area

(124.738g / 100) = 1.24738g * 29.0517081% = 36.23851965g + 124.738g = 160.9765197g

Having weighed the HC sheet is is about 225 grams five or take 1 or 2 percent. I don't own drug dealer accurate scales just kitchen scales that have a resolution of 25g.

This means the the HC board is 40.6% heavier than the DT board for any comparable size of area you wish to choose.

(225g - 160g) / 160g * 100 = 40.625%

While I may not be able to tell you how to modify your designs to account for the added weight I hope this helps all the UK scratch builders out there and if any one spots any errors in my maths please say and I will correct my maths

Also if anyone does have any advice on modifying designs to compensate for the extra weight please feel free to share too!

There seems to be some debate on here over the Hobbycraft foam board available in the UK and how much heavier it seems to be than the stuff the yanks get.

I brought a few sheets from Hobbycraft on Friday after watching a few scratch build based videos at work but before I signed up and looked at the forum. I have just done the maths on how much they weigh in comparison to the quoted size on the Flite test site (http://flitetest.com/support under the general questions section). The board I Purchased from HC is I believe this stuff http://www.hobbycraft.co.uk/hobbycraft-a1-white-foamboard/539724-1000 it was on offer as well

Being from England I am going with the metric system (because the rest of the world uses it America ) and shall convert to metric accordingly.

A sheet of the FT dollar tree foam is 20" x 30" x 0.17" and weighs 4.4oz according to their site. In real money this is 50.8cm x 76.2cm x 4.318mm and weighs 124.738 grams.

This is very close to the size of a sheet of A1 59.4cm x 84.1cm (http://en.wikipedia.org/wiki/Paper_..._size_illustration2_with_letter_and_legal.svg)

which is the size of the board that Hobby craft sell.

Working out the area of each we get an area of:

50.8cm * 76.2cm = 3870.96 cm[SUP]2[/SUP] for the DTFB

59.4cm * 84.1cm = 4995.54 cm[SUP]2[/SUP] for the HC A1 foam board

The difference in size is about 29%

(4995.54cm[SUP]2[/SUP] - 3870.96cm[SUP]2[/SUP]) / 3870.96cm[SUP]2[/SUP] * 100 = 29.0517081%

So we would need the weight of an A1 HC sheet to be 160.9765197 grams to match the DT foamboard for the given area

(124.738g / 100) = 1.24738g * 29.0517081% = 36.23851965g + 124.738g = 160.9765197g

Having weighed the HC sheet is is about 225 grams five or take 1 or 2 percent. I don't own drug dealer accurate scales just kitchen scales that have a resolution of 25g.

This means the the HC board is 40.6% heavier than the DT board for any comparable size of area you wish to choose.

(225g - 160g) / 160g * 100 = 40.625%

While I may not be able to tell you how to modify your designs to account for the added weight I hope this helps all the UK scratch builders out there and if any one spots any errors in my maths please say and I will correct my maths

Also if anyone does have any advice on modifying designs to compensate for the extra weight please feel free to share too!

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