----- Original Message -----
Sent: Monday, June 04, 2007 9:56 PM
Subject: [FlyRotary] Re: Single rotor
video
What a great video. I ran it in slow motion. At one point I had
impression that blade had flexed far enough to hit trailer! I would be very
concerned for blade flex unless I had clear proof it has no long term effect.
Check out the movement of wires and hoses. Makes you appreciate the
import of adding supports and wire ties.
I was curious if video from in front would show the same effects. If
it doesn't, possibly cause is related to fore/aft blade support. Not
likely, but worth checking.
Excellent analysis tool, video. Good work.
Greetings,
I made a short video
yesterday of a single rotor run. The purpose was to demonstrate and
document the prop tip behavior with the stock rubber coupler/damper, so I
can see if it gets any better with the new softer one.
As you can see, it gets
pretty wild at times, particularly when changing rpms. I'm not sure
this is completely abnormal though, because I've watched the Subaru engines
on the RAF2000 gyro do the exact same thing. They even have a bit of
tip wandering too, so some of this may be OK.
During the video,
you'll hear me say 2600 rpm, and at that point, the tips are wandering fore
and aft a bit. The next rpm tested was 3500, and it appears fairly
smooth. You'll note that my throttle control doesn't have much
friction, and closes itself if I don't hold it. By the time I say 3500
rpm into the camera, you can see that the engine has slowed down
considerably, so 3500 is the point where I get up to come back to the
camera, not when I say 3500. For that reason, 4000 rpm became a
hand signal, and appears perfectly smooth.
The video is 60 MB, so
not for the dialup crowd unless you download it overnight. Also, if
there's more traffic than I expect, I may have to shut the link down to
preserve my web space quota for the month.
Rusty
-al wick
Cozy IV powered by Turbo Subaru
3.0R with variable valve lift and cam timing.
Artificial intelligence in
cockpit, N9032U 240+ hours from Portland, Oregon
Glass panel design, Subaru
install, Prop construct, Risk assessment
info:
http://www.maddyhome.com/canardpages/pages/alwick/index.html