Air can go from dry to about 4% to 5% water vapor (depending
on temperature, pressure). Air mixed with water vapor is less
dense (mass per unit volume) than dry air (even if at the same
pressure if I remember correctly).
This means that foggy air is is less "viscous" than dry air.
Lift and drag
At 09:43 AM 3/12/2000 -0500, you wrote:
snip
...How about an intelligent feedback system built into the winch that
could sense a "breaking load" and compensate with resistance to
the power output. Might be faster and smoother that human "toe to brain"
feedback and you could just lean down
How do you unsubcribe from the list?? Mike
RCSE-List facilities provided by Model Airplane News. Send "subscribe" and
"unsubscribe" requests to [EMAIL PROTECTED]
I butchered them. How do the Experts cut ailerons on glass skins over foam
and make them perfect, i.e. no wiggles and no mismatches, I need to know.
I use the follow method. It has worked to avoid the "wiggly line" problem
of the blade following weave irregularities:
I actually "scribe" the
On full-size gliders we use a piece of brass between the
'hook' and the tow line - if the load is too great the
brass breaks, instead of the wings!
Tord,
To elaborate on Tord's , the "weak links" I've used have a kind of
cylinder/piston arrangement with a pin in SHEAR (for predictable failure
-Original Message-
From: Jack Suder [mailto:[EMAIL PROTECTED]]
Sent: Sunday, March 12, 2000 12:14 PM
To: Paul Klissner; [EMAIL PROTECTED]
Cc: jmrjj; Air Bullitin
Subject:RE: [RCSE] On Step
Think of the plane as being set to a "neutral AOA" in a wind tunnel.
Neutral
You got it wrong :-) cutting ailerons off was the subject
Regards
John Ensoll
[EMAIL PROTECTED]
LSF1383 level II
Builder,flier,flyfisherman in retirement
http://www.canterburysailplanes.co.nz
HOME OF THE AMERICA'S CUP
-Original Message-
From: Jack Suder [mailto:[EMAIL PROTECTED]]
-Original Message-
From: Jack Suder [EMAIL PROTECTED]
To: Paul Klissner [EMAIL PROTECTED]; [EMAIL PROTECTED]
[EMAIL PROTECTED]
Cc: jmrjj [EMAIL PROTECTED]; Air Bullitin [EMAIL PROTECTED]
Date: Sunday, March 12, 2000 3:13 PM
Subject: RE: [RCSE] Aireron Cutouts, How do you make them
Guys, guys, guys
It's a relatively simple explanation. I may be totally wrong (Manufacturing
work for 7year may have my AE schooling a bit rusty), but one of the initial
posts on this thread had this "phenomenon" explained.
Condition 1: Glider is flying along in a steady state, dead
I have found that whether the nose pitches UP or DOWN depends on how the
plane is trimmed -- near neutral stability or more pitch stable (nose heavy
trim). And the inertia of the system must also be considered in how the
plane responds to an upset.
All the explanations I've seen about nose-down
I am new to the list. In a few days (or a few hours, depending) I think I am
going to put up on eBay my DJ Aerotech Monarch D (built, w/ two wings, reg
and d-lite, all electronics, etc). When I get the auction running, is it
okay to post a link to it here or is that kind of commercialism
Wow. And here I thought I understood it before.
Just one more thing. If I flew into a really big thermal--one that was
so big I didn't need to turn long enough for my stable glider to reach
an equilibrium again--the true airspeed of the glider (not necessarily
what I'm observing) would be
Last call
Ace MicroPro 8000 Computer transmitter with 2 RF decks, special RF Deck
switch, and Pro 810 Receiver being auctioned at:
http://cgi.ebay.com/aw-cgi/eBayISAPI.dll?ViewItemitem=275937999
J-Bird, rare old 97" span sailplane kit by Craft-Air being auctioned at:
I want to enter the Davenport MOM slope race in May. I have an old Molded
F3b Spectrum/RG15 that Ron Vann built for a guy to fly in the 95 F3b worlds.
I have flown it on the slope quite a bit but have never raced it- has
anybody ever raced this plane? Was hoping this plane would be suitable to
Sorry if this got long, but I only use windvanes to tell me which slope to
drive to. And this windvane theory also doesn't readily explain why Zagi's
and Boomerangs, etc appear to get up "on step" when in good air, no true
tailplane to cause rotation.
I dont want to drag this discussion out
The stuff about the stab being more sensative to the change in effective
AOA is bunk then?
No, if the glider were flying slow enough, and/or if the updraft is strong
enough, then the momentary increase in AOA during the accleration period
before the glider re-stabilizes will cause the glider to
[EMAIL PROTECTED] wrote:
When I get the auction running, is it
okay to post a link to it here or is that kind of commercialism frowned upon?
I think once is ok, but don't give us an hourly report on the bidding. :^)
--
Rich B
RCSE-List facilities provided by Model Airplane News. Send
I'm not sure which answer is correct here. I'm not sure if you can use the
"same airmass" theory because in fact the plane is moving from one air mass
to another (the thermal). OTOH, I'm not sure I'm comfortable with the
weathervane theory, because after all, a weathervane is anchored wheras
What doesn't make sense about this explanation is that CG is not the same as
Center of lift as far as I can see
Rodger
- Original Message -
From: "Jill and Rick Brown" [EMAIL PROTECTED]
To: "Rodger Hamer" [EMAIL PROTECTED]
Cc: "Moved by the wind." [EMAIL PROTECTED]; [EMAIL PROTECTED]
Ohhhsorry, I must have been joking as you point outI don't even know
when I'm kidding anymore...thanks for bringing me to my senses!
- Original Message -
From: "Jill and Rick Brown" [EMAIL PROTECTED]
To: "Rodger Hamer" [EMAIL PROTECTED]
Cc: "Moved by the wind." [EMAIL PROTECTED];
Before the heavy-weights weigh in here, here's my guess: both explanations
are correct, but the tail has the greater effect. As the plane enters
lifting air, both the wing and the tail experience an increase in AOA
(relative to airflow). The wing itself will tend to correct (nose down) to
return
I think the thing that helped me to visualize this is the understanding
that the effect only occurs during the transition to the rising air.
After that, everything goes back to normal.
This has been a *GREAT* thread. It has been a real eye-opener for me.
I think back to flying and seeing the
If a plane is in rising air, and has equilibrated in the mass of rising air,
it is in exactly the same state as if it were eqilibrated in neutral or
falling air. it is just moving forward the same in each mass of air from its
own perspective. So why should it tilt nose down from our perspective
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