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ALL,
Forgot to add that this little tidbit of info should be etched into all rotorheads
brains as it looks to me like excess apex seal slot wear was a major reason for
Ed's engine problem.......Also the strength of the "Hurley" apex seals may be a
factor (compared to Tracy's seals).......IMHO.......As a side note, when scrounging
13B parts (rotors in this case) pay attention to the "Weight code" stamped on
the gear side as mentioned on this forum before.......In my case I was lucky as
both of my serviceable rotors are"D" weight code........If my memory is correct
the codes are A,B,C,D,E........Someone correct me if I am wrong.......Different codes
can be used together if not more than two codes apart.......The idea is to maintain
rotor weights for balancing within factory tolerances.......Lynn keep me honest here!
--
Kelly Troyer
Dyke Delta/13B/RD1C/EC2
-------------- Original message from keltro@att.net (Kelly Troyer): --------------
Thanks Lynn and All,
This info comes just as I have recovered two serviceable rotors from two
89-91core engines......Will give the apex seal slots the "Vertical seal Test" (VST)
for wear........
--
Kelly Troyer
Dyke Delta/13B/RD1C/EC2
> The slot is perfectly straight. No taper at all. If you stand a new or near
> new apex seal on end in the slot, the exposed end should not move more than
> (about) 3/16" total. New slot and new seal gives nearly no movement. The 3/16"
> would be end of life span.
>
> For aircraft use, new or nearly new is the way to go.
>
> You can take engines apart that have been running fine, and the apex seals
> are just about to fall out of the slots they are so short. The slots can wear
> into obvious "V" shapes, and the engine is still running fine. My wife's RX-3
> did that. I was just sitting at a stop sign one day and whack!! A seal came out
> of what was left of a big "V" slot and the rotor crushed it against the
> housing. There was no chrome left on the rotor housings. Big grooves in the
> irons.
> The only piece I could use was the crank.
> The whole thing was scrap.
>
> The rotors are made of cast steel. You can weld on them. I have TIGed holes
> shut and built up gouges and smoothed them off. Again not for aircraft but for
> a dune buggy or any non critical application, I see no reason for scrapping a
> piece I can fix quickly.
>
> I grew up during W.W.II and you were literally not allowed to throw anything
> away. So I don't (until recently).
>
> Lynn E. Hanover
>
> >> Homepage: http://www.flyrotary.com/
> >> Archive: http://lancaironline.net/lists/flyrotary/List.html
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