03-31-2015, 04:21 PM
  • Nero
  • Senior Member
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Just curious, generally, how many mm you add to the fan loft when spec'ing a bulb to make the bulb "equal" the same fan characteristics.  (if using the same knot diameter).
Like, if I love my one fan and want it to duplicate it in a bulb and keep the same knot diameter and the same brush performance…. how many mm should I add to the loft of my fan to spec my bulb?


99 4,193
 04-01-2015, 04:14 AM
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No practical experience, my thoughts on backbone:
A bulb has more backbone, so  a similar height or slightly higher loft, if you want to emulate the same backbone.

21 1,175
 04-01-2015, 04:33 AM
  • MaxP
  • Senior Member
  • Des Moines, Iowa
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This is interesting.  IMHO, there is not a good way to "convert" a fan to a bulb as to characteristics.  Those characteristics are inherent in the knot when its constructed.

However, if there are other experiences, then I'm pleased to learn something new.

69 2,020
 04-01-2015, 06:52 AM
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My best guess is no more than 2mm. I have been pondering the same question. I have a Shavemac 2 band bulb Silvertip with a 26mm knot set at a loft of 52mm. I may be ordering the same knot in fan and probably will go with a 50mm loft. I would not want it exactly the same as what would be the point in having two knots exactly alike. I would just want a similar amount of backbone

46 489
 04-01-2015, 08:44 AM
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I have to agree with Max, here, but if you are going to attempt it, then I wouldn't go more than 2-3mm.
Good luck.

93 21,373
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