Cessna Skycatcher had the weirdest ?spoilers? or whatever they are
  grafted on to the end of the trim tab.  Any idea what they are about?
  s dorr



  They make the tab much more effective at the expense of a bit more drag.
  It is like a so called spoiler on the trunk of a car generating down
 force.

  Why they did not make the tab larger is a bit of a mystery.
  That may have caused a flutter problem. My guess is something like this
 may
  have added to the flutter potential.

  Paul Lamar

  Hmmmm, yes, flutter is always a potential problem.  It is fun to
  wander around a show like S n F and see all these weird little
  aerodynamic tweaks they come up with to fix problems that crop up in
  testing.  I saw another airplane with oddly shaped fence tabs on the
  ends of the ailerons .... obviously another afterthought patch to fix
  a problem that would otherwise have required a major redesign.

  Likely why an old friend used to refer to the subject as
  "aero-god-damn-ics!"

  SD

  SD, did you see any rotary powered airplanes on the flight line this year?
  They are usually parked on the first line on the left end. Facing the
  airshow.
  As I understand Tracy Crook did not make it but I can't get in touch with
  him. Anybody know what happened?

  Paul Lamar

  Paul,  Tracy Crook was there all  day thursday with his RV8 3 rotor and I
 talked with him a while in the auto engine conversion tent.. He is testing
 the PSRU with no damper on the RX-8 two rotor of his RV4 operating for a
 half hour continuous RPM in increments up to full power. There have been no
 resonance or other problems at 12 flight test hours. The hub is splined. He
 thinks the drive is actually smoother without the damper. Tracy has also
 built his engine controller for 8 cylinder engines so I was incorrect in my
 statement that it worked up to 6 cylinders or rotors.

         The only alternative engines in the tent were rotaries with a
 display by the "Cozy Girls"  Randy had an extensive pictured build log of
 their Cozy4  and as usual fielded questions enthusiastically. Chrissie is
 adding a few new products like an under engine turbocharger system and a
 real nice looking intake manifold for a side port. She is addressing the
 stock intake port cut on an angle making the port look taller  than the
 actual cross section by the height the runner enters the port. Nice stuff.
 There was also a front housing water inlet/outlet similar to the     RX-8
 style but it looked like a new casting.

          The twin engine velocity was apparently in flight testing and had
 no winglets at the show. They added 4 sq ft of wing area per side up from
 46 to 50 per side. Jan Eggenfeltner had his Honda 100 HP conversions
 (viking engine) installed in several airframes and was doing runups after
 the airshows.

      Somehow we lost golf carts number 726 and 127 but got the other 19
 returned on time. They may have been hijacked monday but we found out the
 next Sunday.

          I did a bunch of forums and several in the I-Pad3 apps for moving
 map and in flight weather.   The Mad-Elf was  $99.99 per year and well
 featured.  Foreflight $726.00 with free weather WAAS and a few others with
 prices in between.

     The vendor locations were all occupied although some were at different
 locations than in the past. Sonex lost their show displays and transporter
 in a highway accident and were not there. Some of the display aircraft were
 moved from the FAM pavilion up near the flight line to fill in an open area
 where no vendor was located. Attendance by the public looked good to me
 although that is not necessarily an indicator of people buying stuff. I
 actually spent more on the homemade ice cream than tools this time since I
 only bought things like carbide cutters. My wife was also a "volunteer"
 this year riding trams.  As usual it was a nice change of pace with no
 drugs, drunks, or obnoxious people, just typical Sun-n-fun.

 george grimes

 An under engine turbo charger will not work unless there is a oil scavenge
 pump.
 The turbo must be mounted high enough so the oil drains back to the oil
 sump by
 gravity. The pressure in the bearing cavity must be atmospheric or below.

 Paul Lamar

 Paul, there is a scavenge pump.  GG

What kind?

Paul Lamar

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