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Cowl Prop Clearance


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  • 2 weeks later...
4 hours ago, Pavel said:

From what I've been able to find on the internet, 3.5" clearance seems to be a reasonable starting point... 🤔

I can't swear to it but I don't think it matters much.  I would guess an 1" should be fine.  I think my Cozy is about an inch to 1.5".  Here are a few http://www.briansplane.com/2016/07/     https://www.longezpilot.com/N6PC page4.htm   http://www.freeflightcomposites.com/the-krossfire

It is helpful to go to Google Images for this kind of question or even better Google Verbatim then Images to see what others have done.    https://www.google.com/webhp?tbs=li:1    That's where I found these

Edited by Kent Ashton

Cozy IV N13AM-750 hrs, Long-EZ-85 hrs and sold

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I reshaped and extended my cowling and have approx. 1" clearance between prop and cowling trailing edge.  No problems with resonances or any other negative effects.  I was hoping it would help cooling while taxiing and that is indeed much better although I can't say how much of the improvement is due to the reduced prop clearance vs. the new baffle seals.

Pavel, take a look at my cowling some time 😉  KLVK #355

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  • 4 weeks later...

Additional deciding factor, for those of us having exhaust pipe ends inside the cowl, how much of a clearance do we need in-between these pipe ends and the trailing edge of the cowling?.. 🤔

I took measurements at three Long-EZ's here on the field, here are the numbers:

  • Plane 1: Prop-to-cowling: 5.50"; pipe-to-cowling: 1.50".
  • Plane 2: Prop-to-cowling: 5.75"; pipe-to-cowling: 1.00".
  • Plane 3: Prop-to-cowling: 3.00"; pipe-to-cowling: 3.00".


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