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Roy Scott's BE2e: a little mathematical problem.

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David Davis16/01/2019 09:54:38
3197 forum posts
533 photos

I have been building a 1/6 scale BE2e for some time. Other projects have got in the way!

I have an accurate drawing of the BE2's engine in the May 2008 copy of "Flying Scale Models" but it is to 1/10 scale. Maths was never my strong suite, a bare pass at O Level, so by how much would I have to increase the size of the drawing to arrive at 1/6scale.

Please show your calculations. wink

kc16/01/2019 09:59:16
5802 forum posts
167 photos

Multiply by 10 and then divide by 6 which my calculator says is 1.66666666

The Wright Stuff16/01/2019 10:31:04
1383 forum posts
226 photos

Can't argue with that!

David, are you scaling manually with pencil and ruler, or photocopying to enlarge?

David Davis16/01/2019 10:45:32
3197 forum posts
533 photos

Thank you KC and WS.

Multiply by ten and divide by six. I believe that the fashionable expression is,"Doooh!"

Actually I'm sending a note to Vacuum Vortex to see whether they can make up some cylinders for me. I can make up the rest of the engine from scrap.

supertigrefan16/01/2019 10:49:10
687 forum posts
5 photos

Shame you've not done a build thread on it David, the BE2 is on my (very long) bucket list.

kc16/01/2019 11:27:41
5802 forum posts
167 photos

Be worth checking that the drawing was actually printed at an accurate 1/10 scale! Even plans have been printed at the wrong size......

When scaling drawings by measurement I always put the conversion factor in as a 'constant' in the calculator then typing the measurement in and pressing = gives the new size.

David Davis16/01/2019 19:05:50
3197 forum posts
533 photos

To do that I would need to know the dimensions of the real engine!

Dave from the future16/01/2019 21:27:41
22 forum posts

Have you seen the BE2C build on RCGroups?

Bob Cotsford16/01/2019 21:44:36
7684 forum posts
427 photos

David, this Wiki page includes the overall dimensions of the 70/80 hp engines used under 'specifications'. Google images contain plenty of photos that should allow you to get a pretty accurately proportioned dummy engine.

cymaz16/01/2019 21:52:15
8206 forum posts
1137 photos

DD , some one might have a 3 D print of a radial......or know where to source one.

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