Paul,

 Do you have details on autogiro's running rotaries ? Pardon
 my
 thoughts, but I think a rotary would work well.


 Thanks,

 Barron

 I don't have any dwgs but Gary Buster might help you out.

 http://www.youtube.com/watch?v=QOwb8QRHrMY

 Paul Lamar



 Back in the days of the late Cierva and before the Advent of
 the
 helicopter the autogyro was quite a capable machine. It had
 heavy two
 or more bladed rotor systems which stored a great amount of
 energy.
 Todays autogyros on the other hand in my opinion as a rated
 Chpl with
 IFR must be the daftest thing out there. Flimsy contraptions
 with
 energyretention on the scale of a chopstick. You would not
 find my
 behind in One of them on a calm, stable day let alone in any
 kind of
 turbulence. Surprises me they are legal.

 Lutz Strobel

 Have you looked at the you tube video?
 http://www.youtube.com/watch?v=QOwb8QRHrMY

 I filmed the video. Looked pretty good to me. However it was
 a calm
 day.

 IMHO the main problem is MPG.

 Paul Lamar

 Actually the main problem is negative G's When that happens
 the disk
 is no longer loaded and looses momentum, which is where the
 lack of
 stored energy due to the low mass of the rotor system comes
 in....
 the second severe problem is the underslung rotorsystem most
 of the
 nowadays ( refuse to callem modern ) autogyros employ. It
 can kill
 You fast. In summary stay away from them, even if a crash of
 one of
 them would have nothing to do with being powered by a Rotary
 engine,
 it would still rub off. - Lutz Strobel


 We are not doing outside loops here :)

 There are a lot of them in the States. If the accident rate
 were much
 higher than other experimental aircraft the FAA would be all
 over
 their case.

 Paul Lamar


 A lot of people think a gyro works by weight shift, it does
 not, the
 teetering rotor and gimbal head allow the rotor to in effect
 change
 pitch around the circle as the advancing blade would have
 more lift
 than the retreating blade if it did not teeter They are not
 as simple
 as they look.

 John Evans



 Lutz you should try them although I think no one could
 pursuance you
 to do so now.  They are fun and safe, and handle
 turbulence very
 well.   If fact you do not feel any at all
 even in very high wind.
 The "rigidity" which is the percent of lifting surface in
 the whole
 disc is very small, compared with that of a plane which is
 100%, so
 turbulence is no issue for a gyro.

 Gordon Gao

 Thanks for the warning Lutz, but I think if flown properly
 the gyro's
 are as safe as the next aircraft.  Many people see the
 "open cockpit"
 and can't imagine flying them.  This is because people
 don’t
 understand them, and this is understandable as they are not
 as common
 as their fixed wind counter parts.


 Thanks,

 Barron

 There are 100's flying in the states and I'll bet the
 accident rate is
 no higher
 than hang gliding. People don't fly them in thunderstorms
 and they don't
 use
 them for getting from one place to another. Strictly
 recreational.

 You would not fly your hang glider in a thunderstorm would
 you?

 Just put a tach on the rotor disc and an alarm :)

 How people choose to kill them selves is nobodies biz but
 their own.
 When is the last time a gyro crashed and killed some one on
 the ground?

 Government, get  out of my life and I don't want to pay
 them to do it.

 Paul Lamar



      Hi!: by entering SAE.org  the
 store, and/or entering the search
 word 'autogyro' in the box at top right side of page,
     you can find some technical papers about this
 flying machines, some
 from its inventor: Juan de la Cierva, and others
     from people in the USA companies that
 produced autogyros, and other
 engineers specializing in Aeronautics.
      Is $24 downloading each paper, no
 need to be a member, and for the
 articles that exist in SAE paper version as well
       as an article in SAE Journal, the cost
 of downloading a full back
 issue is $14.
      By digging in the Table of Contents
 of each issue, most are
 available while others don't, you may find good
     reports on many issues connected to engines
 and aircraft; as no
 major progress was done since WWII in the field
    of reciprocating engine and propeller
 speed range aerodynamics, many
 old articles still have a value, and the goal is
     not outperforming of making out of date the
 NASA work.

       Thanks for your attention, have a good
 week. Best regards. Salut †


      Jose Gros-Aymerich

         Madrid, Spain

The two biggest Autogyro problems are 1. They have a lot more drag per lift than a fixed wing. 2.When you reduce the angle of attack of the rotor disk too fast, the top drag reduces pitching the nose down and can result in tumbling forward! Not survivable.

Dave James

Agreed, this is why it is important NOT to "HOTDOG" in an autogyro.

Thanks,

Barron




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