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January 23, 2018. Issue
Pic below a blast from the past. Randy Richmond at
52F after take off. 1/250s. f/13 ISO:100
226mm. Canon EOS-1D Mark II N.
to fit /
Thoughts RE: the Thermal Expansion of Plexi ...AlexPeterson
re-read this thread, and have some thoughts.
It seems we've been discussing stress concentration factors, which
are typically used when, for example, one places a strip of material
containing holes under tension. The stress is "concentrated" around
the edges of the holes in the manner depicted here:
However, this does not fit our situation entirely. The above
depiction assumes the tension is not being applied directly on the
edges of the hole. In the case of canopies attached entirely or
partially by rivets, once the acrylic has contracted enough to
contact the rivets at the extreme ends, the force is applied at the
hole. We now have a local contact stress which may be extremely
Bill's interesting test of attaching a strip of acrylic to a steel
angle might have a different outcome if the strip were wider, yet
still attached in the same way. The resulting force on the fastener
will be proportional to how wide the strip is. Our canopies are
really wide, as analogized to this strip test.
I guess for me, what remains a mystery, is why they don't all
crack... When I take mine from a 45F hangar out into 0F or so
weather, the clicking it makes is horrifying, once the engine is
running and the rapid cooling begins. The clicking is presumably the
acrylic shifting relative to the frame, as the mounting scheme was
designed to allow. If it stops clicking I need to worry.
It has been doing this every winter for 1600 hours/16 years, and
hopefully it will continue to behave. The -8 is obviously worse
case, given its length and the apparent mis-match to the curvature
near the aft end.
Motivational Video ...Nigel
[ed. After watching some of the
video I said to myself, "Hey, that's the same airport I'm based at.
Then I had a light bulb over head moment and remembered this is the
nice guy who put a new roof on my house after the last bad hail
storm (his day job is running a roofing co.). Thanks again
Low time Pilot, New (to me) RV, motion sickness
Hi All, long time lurker here, only a couple of posts.
I received my recreational cert. back in 2012 (Australian equiv of a
sport pilot i suppose).
My 1st flight was in a Fly Synthesis Texan, on a hot bumpy day.
Another student on the ground before my flight said, "Don't throw
up!". We got into the circuit started doing basic effects of
controls etc. I'm getting greener. I said to the instructor, "i'm
going to spew!" He handed me a towel and I used that. Nothing
actually came out of me, just a big burp, was a strange experience.
We landed, and I called it quits for the day.
I ended continuing my training, and it took me, according to my
logbook, about 19 hours to go solo. I battled air sickness the whole
way. I then completed the endorsements I wanted (cross country,
radio, passenger etc).
My instructor was(and is) convinced its all in my head. I, to a
point, agree. Sometimes I would feel sick before we were even
airborn. It was never a case of being nervous about the flying or
the landing. I knew I could land it, fly it, navigate etc. I
was afraid of being sick.
I kept flying for another year or so in a rented aircraft, which was
a ICP Savannah with a very light wing loading, STOL kind of
aircraft. Probably not ideal for our climate. Hot, humid, bumpy etc.
Then work rosters and things changed, didnt have time to continue
Fast forward to present day. I now have a lofty sum of 60 hours
On the weekend, I pulled the trigger and bought a RV-7a superior
io360 cs dynon SV touch etc, nice plane.
Went for a short flight with the owner, and again its the middle of
our summer, hot humid and bumpy, After 15 mins, I'm asking to go
home. No vomiting, just the sweats and queezy.
I know it has been a considerable amount of time since I've flown,
and I'll never be an aerobatic king, but I'm stubborn and have
wanted an RV ever since I found a stack of sport aviation magazines
in a secondhand shop when I was a kid.
But now I'm thinking I've made a mistake. More then anything, I get
angry/disappointed/ashamed about being sick, and disappointed that I
cant enjoy what has been my passion since I could talk!
Sorry for the long winded post.
Flap rod rod end bearing
Going through archives and found this post. I’m installing my flap
rods and have run into the same issues with the rod end bearing
running out of enough tread after washering out from the flap end
rib. This is a RV4. I’m sending my drawing, I’m having trouble
understanding the “spacer” added to get the rod spaced further
inboard. Did you use a different rod bearing than specified? Thanks
for any pics drawings or info you can share. I could make this work,
it’s just a lot more hole running up the fuse than I wanted.
RE Flap Pushrod Testing for Fauilure ...Scott
3D Printed Tie Down Ring Fairing Update ...Steve Melton
I've never been faster. 141 kts at 20.5 MP, 2325 rpm at 2500 ft.
low power setting. low clouds. this is about 6 kts faster than my
normal speed. temp = 10C.
Flap bracket fairings with buttons and tie down fairings, both
sides. Slipping thru the air. The tie down fairings worked
perfectly, concept 1 rev 2. I plan to evaluate concept 2 in the
future but I'm pleased so far.
A Stiffener Mod to the Lower Cowl of a RV-8 ...seen at 52F.
to fit /
to fit /
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