YS 140L tuning questions

[Ihncheol Park]

Messagehttp://www.truturn.com/cgi-bin/store/agora.cgi?exact_match=on&p_id=tt
0814a&ppinc=adapt

http://www.truturn.com/cgi-bin/store/agora.cgi?exact_match=on&p_id=tt0813a&p
pinc=adapt

The 814A is for 63/91/120s because of the short end nut.
The 813A is for 140s with long shaft although it shows as short shaft.  The
outside nut is pretty long and the inside one looks to be through the prop.
So, it looks like I need to bore the prop with larger OD of 813A nut.
(probably 11mm)

Am I right?

Ihncheol
  -----Original Message-----
  From: discussion-request at nsrca.org [mailto:discussion-request at nsrca.org]On
Behalf Of David Harmon
  Sent: Sunday, June 01, 2003 8:28 PM
  To: discussion at nsrca.org
  Subject: RE: YS 140L tuning questions


  Those numbers are TT adapter nuts. The APC props have different hub
thickness depending on what size prop you are using. Some TT spinners will
not fully engage the backplate if the prop hub is too thick....other TT
spinners when tightened will distort the spinner backplate.
  You can add washer shims in front of the adapter nut to prevent the
distorting and shorten the adaptor nut if the spinner will not go on all the
way. It's kinda goofy but that seems to be the way it is. I asked a few
other flyers about this problem a few years back but they didn't seem to
know what I was talking about.
  TT may make a short and long adaptor nut....but I couldn't find it on
their website.

  Dave
    -----Original Message-----
    From: discussion-request at nsrca.org [mailto:discussion-request at nsrca.org]
On Behalf Of jim ivey
    Sent: Sunday, June 01, 2003 8:00 PM
    To: discussion
    Subject: Re: YS 140L tuning questions


     lhncheol
    You may have the wrong threaded adapter nut. Check that out. I'm not
familiar with 813A, or 814A. What are these numbers. Been a while since I
bought adapters.
     My 140l's run at full throttle about 1 1/4 to 1 1/3 needle opening.
That has a lot to do with nitro content. I run 30% heli fuel. I'm guessing 2
turns out is a good starting place.

    Jim Ivey
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.f3a.us/pipermail/nsrca-discussion/attachments/20030601/a37c93d2/attachment.html