Finn, the Mystery is solved.
The seals themselves are .075" or 1.905mm
thick not 2mm, The slots are approx 1.93mm wide - closer to 2mm but not
quite there either. My previous slot width numbers were in
error. I discovered that I apparently was not holding the dial calipers
perpendicular to the slot, it makes a different. After slowly rocking the
calipers, I could find Perpendicular. I also stuck a
seal in the slot and the smallest leaf gauge I have in the set is 0.0015"
(.0381mm) and it was a tight fit and would not go in some cases indicating the
clearance between apex seal and wall is 0.0015" OR LESS. The measurement
would indicate closer to .0010" or 0.0254mm, so a reasonably tight fit
compared to the 0.18mm gap I had in some slots on the old rotor.
Something like 7 times the new clearance!
Hope this enables you to sleep tonight, Finn
{:>)
Ed
----- Original Message -----
Sent: Wednesday, April 20, 2005 10:27
AM
Subject: [FlyRotary] Re: New
Rotors!
Those numbers do not make sense. Aren't the seal 2 mm?
How will they fit in a 1.778mm groove?
Finn
Ed Anderson
wrote:
Got the new rotors today - first time I've
ever seen a new rotor - the are bright metallic
{:>).
The depth of the apex
seal slot on the new rotors ranged from 9.65mm to 9.77 mm.
Interestingly the width of the bottom of the apex slot was 1.88mm but the
top was narrower at 1.778mm. I noticed that the lip of the apex seal
slot had a tiny burr of metal along it as if they were not using a sharp
enough tool or else pushing it along too fast. Or perhaps no one
took the time to deburr the slot.
Just in case any of you ever wonder whether
you are looking at a 9.7:1 rotor or some other rotor, there is a fairly
easy way to tell. Lay a straight edge across the depression in the
rotor and measure from its bottom to the center of the depression, it
should measure right at 4 mm. The 9.1 measure around 7mm for
comparison. Just thought you might want to know.
Ed