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Marko's Bulb Calculator

Marko's bulb calculator was designed for IOM use and so you have to know how to work around to get details less than 1kg
here is a potted guide

link to download
Picture
Picture
Step 1
- click on file
- select NACA foil
- (I usually use 64A0XX)
Step 2
- click on file
- select Set Bulb parameters
- change target weight to 1 kg (it won't go lower than this)
Picture
Picture
Step 3
- look at the table on the left of the screen for a say 275g keel bulb it tells you it is between 13 and 14 cm long
- click on file
- select view bulb data
- change the length to the required length to give you the correct weight (for a 275g bulb this is 13.85 cm give or take a bit) for different weights
- use the change options button to refine the length of the bulb untill you get the right weight
- close the view bulb data menu

Step 4
-  click on file
- select print
- select position tab
- change to centre
- select view tab









- uncheck side and sections
- for making a plug from 3/32 balsa change the slice thickness to 0.238125
- if you are using lead to make a bulb directly from slices the thicknesses are as follows Lead Code. 3. 4. 5. 6. Thickness (cm). 0.132. 0.180. 0.224. 0.265 (I haven't tried this hopefully it will work)
Picture
Picture
Step 5 - Click ok in print menu it should print you out the sections to produce the correct weight keel bulb! A bit of trial and error will see you get it right.
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