My Head is Spinning! (Long)

[Nik Middleton]

Dave valid comments.

But....

Setting aside, initial costs, total cost of ownership etc, the ONE thing
that keeps me firmly in the 4C camp is consistent idle.  What I have
witnessed with my own eyes at US/European Nats, and World championships, is
that if there is a dead stick after say, a long downline, it is ALWAYS and I
really do mean always, a 2C.  You might say that it's an incorrect setup,
but if the people at the peak are having this problem, what hope for us mere
mortals?

rgds


  -----Original Message-----
  From: discussion-request at nsrca.org [mailto:discussion-request at nsrca.org]On
Behalf Of David Lockhart
  Sent: 09 January 2004 16:36
  To: discussion at nsrca.org
  Subject: Re: My Head is Spinning! (Long)


  A lot of good points and discussion being made in this thread - and nice
to see no "feuding" amongst brands.  It truly is nice that options are out
there.

  A couple more items to consider -

  Initial price vs. secondary costs -
  - fuel - the average 2C is running on lower nitro than the average 4C (do
the math based on the number of times you fly in a year).
  - vibration - the average 4C vibrates more than the average 2C (makes your
own estimates for airplane longevity, servo gears, servo pots, etc - and
don't forget to include your time for completing the maintenance).
  - maintenance cost of engine - parts  is parts, they all wear, and all
cost money to replace/fix.  4Cs have more parts.  Again, based on the number
of flights you fly in a year, add up the cost for parts and the time to make
the repairs.
  - Use the number of posts on this list as resource to gauge what engines
need more repairs.
  - when I do the math, the 2C wins.

  Throttle linearity and consistency -
  - In my opinion, throttle linearity is far over-rated - everyone has there
own idea on what a linear throttle is - is 50% stick = 50% RPM and 90% stick
= 90% RPM?  Linear to one person is not linear to another - which is why you
see many identical setups using different throttle curves in the hands of
different pilots.
  - Throttle consistency is what we really care about - if the throttle is
consistent and predictable, it is easy to fly - and if it doesn't feel
linear, the "curve" can be adjusted to make it feel "more linear" - the
curve can be adjusted mechanically or with the radio.
  - The other thing we care about is that the throttle is symmetrical and
without hysteresis - meaning throttling up to 50% stick will get you the
same RPM as throttling down to 50%.  The biggest instigator of hysteresis is
a poorly setup piped 2C (but other things on both 2Cs and 4Cs can and do
cause hysteresis).
  - I've not had a problem getting 2Cs or 4Cs to run consistently, so for
me, this is a wash.
  .................................
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