Today's Message Index:
----------------------
1. 08:43 AM - Ever Happen To You ? ? (Bernard Wilder)
2. 10:25 AM - Re: Ever Happen To You ? ? (David Weaver)
3. 12:38 PM - Re: Ever Happen To You ? ? (Keith Palmer)
Message 1
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| Subject: | Ever Happen To You ? ? |
To avoid speculation as you read :
The canopy was latched and the pins in the back of the canopy were and still
are as per specks as are the holes in the bulkhead into which they fit.
On final - a little hot and high.
Pulled nose up and bled off speed. Put her into a forward slip nose to
starboard - airspeed 75 - 80.
Wanted to loose altitude faster so pushed the nose farther to starboard to
about 35 degrees off center. Pushed nose down and kept air speed at about 75
mph. ((Though with the pitot tube at this angle, accuracy of airspeed can be
questioined.))
On the starboard side, the pin can out of its hole, roller came out of its
channel, canopy flexed up and
out so could see an inch and a half gap between cockpit edge and the bottom
of the canopy. It was of course flapping.
Port side of the canopy stayed put.
Straightened out made a normal landing. Pushed canopy forward, pulled it in
and put roller back in its channel. Closed canopy and it fit as normal.
Looked everything over and found no sign that anything had happened.
No blood - Not foul ! ! ! !
Subsequent flights normal.
The only explanation that I can think of is that at the angle of attack wind
was coming over the canopy at an angle such that it generated lift,
distorted the shape of the canopy and pulled the starboard side up and
out.
What do you think - other than 35 degrees is probably too extreme an angle
of slip for a Pulsar.
Bernie Wilder
Message 2
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| Subject: | Re: Ever Happen To You ? ? |
Bernard -
I suspect one the major variables in trying to compare your individual hand
made canopy to another builders is the amount of spring-back you ended up
with between the rear horse shoe shaped frame member sides.- I would thin
k the air side load presented, during your approach with crab profile, offe
red enough compressive force to canopy rear frame member to cause the windw
ard side roller to become disengaged.- I have noticed that a warm canopy
is easier to compress during installation than a cold one.--I was liber
al with the uniglass when I built my canopy.--If I had experienced what
you have described, I would-reglass the inside surface of the rear frame
member with one thin layer of carbon fiber tape (uniglass) to stiffen it u
p.- The carbon fiber is-less weight than-standard fiber glass.- You
will have to cut and overlap individual pieces around the horse shoe shape
d frame member.- I am glad to hear you did not loose your canopy in fligh
t.
Dave Weaver - N912GR--
--- On Sat, 1/22/11, Bernard Wilder <bernard.wilder2@gmail.com> wrote:
From: Bernard Wilder <bernard.wilder2@gmail.com>
Subject: Pulsar-List: Ever Happen To You ? ?
To avoid speculation as you read :
-
The canopy was latched and-the pins in the back of the canopy were and st
ill are as per specks as are the holes in the bulkhead into which they fit.
-
On final - a little hot and high.
-
Pulled nose up and bled off speed. Put her into a forward slip nose to star
board - airspeed 75 - 80.
-
Wanted to loose altitude faster so pushed the nose farther to starboard to
about 35 degrees off center. Pushed nose down and kept air speed at about 7
5 mph. ((Though with the pitot tube at this angle, accuracy of airspeed can
be questioined.))
-
On the starboard side, the pin can out of its hole, roller came out of its
channel, canopy flexed up and
out so could see an inch and a half gap between cockpit edge and the bottom
of the canopy.--It was of course flapping.
-
Port side of the canopy- stayed put.
-
Straightened out made a normal landing.- Pushed canopy forward, pulled it
in and put roller back in its channel. Closed canopy and it fit as normal.
-
Looked everything over and found no sign that anything had happened.
No blood - Not foul ! ! ! !
-
Subsequent flights normal.
-
The only explanation that I can think of is that at the angle of attack win
d was coming over the canopy at an angle such that it generated lift, disto
rted the shape of the canopy -and pulled the starboard side- up and out
.
-
What do you think - other than 35 degrees is probably too extreme an angle
of slip for a Pulsar.
-
-Bernie Wilder
Message 3
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| Subject: | Re: Ever Happen To You ? ? |
Hi,
I had often thought of having a retainer at the most aft position
of the wheel track, so when closed the wheel could not jump out of the
track, but never got round to it.
----- Original Message -----
From: Bernard Wilder
To: Pulsar Net
Sent: Saturday, January 22, 2011 6:41 PM
Subject: Pulsar-List: Ever Happen To You ? ?
To avoid speculation as you read :
The canopy was latched and the pins in the back of the canopy were and
still are as per specks as are the holes in the bulkhead into which they
fit.
On final - a little hot and high.
Pulled nose up and bled off speed. Put her into a forward slip nose to
starboard - airspeed 75 - 80.
Wanted to loose altitude faster so pushed the nose farther to
starboard to about 35 degrees off center. Pushed nose down and kept air
speed at about 75 mph. ((Though with the pitot tube at this angle,
accuracy of airspeed can be questioined.))
On the starboard side, the pin can out of its hole, roller came out of
its channel, canopy flexed up and
out so could see an inch and a half gap between cockpit edge and the
bottom of the canopy. It was of course flapping.
Port side of the canopy stayed put.
Straightened out made a normal landing. Pushed canopy forward, pulled
it in and put roller back in its channel. Closed canopy and it fit as
normal.
Looked everything over and found no sign that anything had happened.
No blood - Not foul ! ! ! !
Subsequent flights normal.
The only explanation that I can think of is that at the angle of
attack wind was coming over the canopy at an angle such that it
generated lift, distorted the shape of the canopy and pulled the
starboard side up and out.
What do you think - other than 35 degrees is probably too extreme an
angle of slip for a Pulsar.
Bernie Wilder
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