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 51 
 on: Today at 04:13:32 AM 
Started by Shug Emery - Last post by Perry Rose
Texting, pocket pool, swatting bugs, holding a mirror and flying with my back to the plane. Normal stuff.

 52 
 on: Today at 01:01:16 AM 
Started by Heman Lee - Last post by Brett Buck
Finally I figured out how to use the manually focus so you don't see the in and out focus when the model passes the camera.
In general, it's very hard to shoot CL stunt.  I can not see the model in a 2" LCD viewfinder so I have to guess the framing.  That weekend was particularly difficult due to either 'no wind' or 'changing wind directions' - so it was very difficult to anticipate getting directly downwind.  If I am not directly behind, perspective added by lens distortion makes it hard to judge a maneuvers on video screen.

  Oh, don't get me wrong, you didn't mess it up and I am not complaining. This has been a problem with every stunt video ever made. It's pretty good for capturing the overall shapes. What it can't do very well is show the small deviations of attitude and translational position that make most of the differences that are frequently the deciding factor in these sort of close contests. A lot of the guys use video extensively and then are frustrated by their contest scores when they can't see what they are doing wrong. This is true even with 1080p. The eye can selectively see small areas or gross characteristics at the same time, like an instant zoom lens, but the camera can't.

   In the flight above, the gross aspects of shapes were pretty well illustrated, but things like the shape errors in and out of the corners (which were quite obvious on the flight shown above and it was one of the worst flights I had done in a contest in a long time, probably since the 2007 NATs or maybe 2012 Golden State) were not really detectable. It was sure easy to see it in person.

    Brett

 53 
 on: Today at 12:25:54 AM 
Started by Heman Lee - Last post by Heman Lee
  Video shows some aspects pretty well, and others not so well. Depends on what kind of mistakes you are looking for. For instance, the corners inside squares on this flight were pretty horrific, but you can't see it here.

  Brett

Finally I figured out how to use the manually focus so you don't see the in and out focus when the model passes the camera.
In general, it's very hard to shoot CL stunt.  I can not see the model in a 2" LCD viewfinder so I have to guess the framing.  That weekend was particularly difficult due to either 'no wind' or 'changing wind directions' - so it was very difficult to anticipate getting directly downwind.  If I am not directly behind, perspective added by lens distortion makes it hard to judge a maneuvers on video screen.

 54 
 on: Today at 12:09:25 AM 
Started by david beazley - Last post by Dick Pacini
Read the notice again.  There are other parties interested in taking over the 3 magazines.  Let's keep our fingers crossed.

 55 
 on: Yesterday at 11:34:11 PM 
Started by Carl Cisneros - Last post by Dane Martin
can you post a pic of the k&b 61? or maybe the model number. the ones i knew were monsters! just loads of power. i had a few pattern planes with the RC version. i loved them!

 56 
 on: Yesterday at 11:27:16 PM 
Started by Shug Emery - Last post by Dane Martin
i put it in my pocket. or holding my soda. sometimes a cigar.... Turn

 57 
 on: Yesterday at 11:09:36 PM 
Started by Shug Emery - Last post by Ted Fancher
I tried and tried to "hold my free arm" but every time I did I had to let go of the handle and I didn't have enough airplanes left to perfect it.  I don't know how you guys do it!

Ted

 58 
 on: Yesterday at 11:04:02 PM 
Started by Shug Emery - Last post by Mark Scarborough
I know Ted Fancher looks like Napoleon. His off hand seems to grip his shirt right over his heart.
I tend to keep mine on my chest as well,, otherwise I look like a doofus ( well more than normal) flailing my hand about

 59 
 on: Yesterday at 11:02:14 PM 
Started by Avaiojet - Last post by Mark Scarborough
you might want to carefully examine the crack eminating from the right cockpit opening,, it could prove terminal,,

 60 
 on: Yesterday at 10:59:47 PM 
Started by wwwarbird - Last post by Brett Buck
I have been working with the Evolution .36 C/L engine on and off for about 4 years, with limited success, but just enough to encourage me to swap a ST34 for a 2nd Evolution.  I had tried my own venturis, various prop loads, fuel mixtures, decompression and glow plugs with some occasional success, only to find the engine to be inconsistent.
This Summer I finally decided to check the cylinder port timings and I discovered that the exhaust duration is 150 degrees and the intake ports timed for 30 degree blow-down (total difference between intake and exhaust).  The data I collected from researching  stunt engine tests in Stunt News and other sources revealed that typical cylinder timings for stunt engines generally vary from 130 to 140 degrees exhaust and approximately 15 degrees blow-down.  I'm stuck with the crankshaft timing as I cannot change it anyway.

     The best running stunt engines I have are around 140-145. The 40VF varies but it's around 142-145. The "Brett" version of the RO-Jett is 144 (at least thats what they are supposed to be) and it is the version that runs the best. Others have 140 (OK but not as good) and 136 (not nearly as good). The lower the exhaust duration, the more excessive the power change in maneuvers and the bigger difference you get between 2 and 4 if you let it transition.

They also have very aggressive crank timing. I am not sure what you would want change on the EVO but it's pretty easy to make it wider if you need to.

    The blowdown does seem excessive, but I don't have good numbers for that.

    Brett

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