Tip on bagged wing twist removal.
Harley,
As I reported in RCSD about a year ago - had a similar problem with a wing on a Whisper. Solution was to clamp the the root of the offending wing to thebench (or just leave it on the fuselage and secure the fuselage)add a piece of Al angle about 18"
Confirmation thatthese guys are shipping as mine arrived today. First
impression - works fine, does what it says, has a littleclear plastic
slide cover over the rotary switches to keep from messing with them
inadvertently - nice touch but won't keep you from gettingin there if the
slide is
A few weeks ago I had offered to make some program available on a web site. A
preliminary attempt has been made to do that. A Zip file for both the Polar and
Airfoil template program can be found at:
http://myweb.cableone.net/regdave/
Some supporting documentation is available as well
Just got off the phone with a couple of young folks and if I dont share this
my face may break from grinning too much.
For the past three months a couple of high school students in our area have
been working with me on a project to measure in-flight sailplane performance.
They started by
***Any suggestions for DLG wing connector, where you only need four pins and
the light weight is important?***
Dean's 4-pin on a short harness
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Oleg,
Thank you for your comments. My apologies for missing the Span Loading
differentiation on the first go around.
That said, I still don't agree with the trends you've noted unless one is
dealing with the induced drag term (and wing) in isolation from everything else.
You can't ignore
In a message dated 2/18/2005 12:47:33 PM Central Standard Time,
[EMAIL PROTECTED] writes:
D(N) = [ W(N)/L(m) ]^2 / [Pi*q(kg/m*s^2)],
(note, that W = m*g (N = kg*m/s^2)), therefore for the units:
N = [N^2/m^2]/[kg/m*s^2] = N^2*s^2/kg*m = N^2/N = N
So nothing is missing, there is no average
***
Generally speaking higher aspect ratio with either a fixed span or area will
equal a reduced wing chord. This will result in reduced reynolds numbers
which equals reduced performance for most all airfoils
***
Yes, but also what's happening (for a fixed wing span) is a trade off
I suspect we would not harm the 2M class at the Nats with only one day
of flying and would certainly enhance the flying time for NOS and RES.
I kinda like this idea.
There seems to be a broad spectrum of opinion about 2M and other classes.
Sounds like high end competition
Thanks guys, very interesting. My wife is an environmental biologist and
she thought this was so neat I might even get the OK for a new plane!
- d
Before we trash 2M entirely, Les made some good points.
- Newbies almost always show up with a 2M,
- It's a neat little compact size for fun flying and low level work,
- It doesn't take nearly as much paraphernalia at the field to have a good
time,
- A used HLG/DLG fits the 2M class - try
There was a guy here local that had onboard GPS that would transmit
voice
down to a handheld receiver giving him altitude and airspeed updates
throughout the flight.
Does anyone know who may sell this equipment for models? Is there also
something that can give me a 3D model of my
*
From: Arne Ansper [EMAIL PROTECTED]
Original post from SALglider list by Mark Drela:
From [EMAIL PROTECTED] Fri Jul 23 12:51:06 2004
To: [EMAIL PROTECTED]
Subject: Re: Chamfered Mylar leading edge - helps wrap
*
Thanks very much for the update. This works - last night's bagging
In a message dated 1/25/2005 1:07:30 PM Central Standard Time,
[EMAIL PROTECTED] writes:
Dave. . .there is no need to slit the Mylars to get a smooth tip. Go to page
24 of File 3 of the Genie pages http://genie.rchomepage.com/ to see how the
Icing putty can be used to form a tip that
Somewhere out there on one of the groups, there was a discussion of sanding
mylars at the LE for vacuum bagging to help it conform better to the LE
radius. I've searched several archives and can't find it. Also a technique for
notching the mylars around the tip contour for better fit there
**No big deal, no boasting to the whole world**
On the other hand.
I'm kinda proud of Gordy for making the effort. Is it bragging or
advertising for LSF? I think it's raised some awareness of this excellent
program and
that's good.
If there had been an impromptu Level 3 contest in
Anyone know the ground elevation in this area?
Good place to pick up this type of information is:
http://www.topozone.com
If you've got the coordinates (in several types of units), it will bring up
a topo map of the local area complete with USGS elevations, contours, etc.
- Dave R
Anyone know a good source for retriever drums? Rahm style preferred. I
thought I heard someone picked up the production of those units but I've lost
that
information.
Thanks,
- Dave R
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Thanks very much for posting. Great pics. Lots of neat stuff. Us folks out
in the boonies are REALLY jealous.
Well worth a look through.
- Dave R
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Just an additional data point to what has already been replied, if you have
a binding servo and the drain goes up, it may drop your battery voltage
enough to compromise your receiver range. The battery may have plenty of
capacity
but, depending on the internal resistance, a high current
Hi,
Could someone please steer me to the link where I could
purchase this ?
Or, does anyone have one they would like to sell ?
Thanks,
Dave Hauch
Mich.
Try:
http://www.paonline.com/hayman/video.htm
Once you've got it, NEVER sell Phil's video. It's too good!
- Dave R
RCSE-List
A while back, suggestions were offered for taking the curl out of mylars
that had been in storage for a long time. I've lost the original list but
whoever suggested ironing, thank you, that REALLY worked.
First time around I didn't get it hot enough but a new planform (and mylars)
led to
For many years an EE in our group used to do this when we had a failed
battery but we ordered a back-up ASAP because the dendritic formation that had
been 'zapped' was an indication of more bad things to come.
- Dave R
An on-line reference follows:
Thanks for the info (on and off list) supplied on the Futaba Tx (9C/CS)
module that appears to soon be available. Comments regarding freq setting and
switches are highly appropriate and will require caution and attention as this
type of technology becomes more routinely available. In the
The Adams actuator provided rudder only control. The rudder banged from
side
to side continuously at neutral and we found later that the best control was
available by using the full right/left buttons, even though the conversion
kit supposedly provided proportional control. How long the
In a message dated 12/22/2004 12:44:45 PM Central Standard Time,
[EMAIL PROTECTED] writes:
Anyone know of a good plier-like tool that gets the job done?
Jim Frickey made a neat little tool that worked well. He showed it to me at
the 2003 MMMR. It was a pair of inexpensive flat nose pliers
Jim Frickey's ball link tool is discussed (and pictured) in my Sep03 column
in RCSD:
http://soaring.ryanflowers.com/rcsd-pdf/2003/RCSD-2003-09.pdf
- Dave R
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unsubscribe requests to [EMAIL PROTECTED] Please note
Well, memory serves but only partly. With input from a couple of guys who
also witnessed this event at SULA (thank you all for the corrections and the
memories), the Mirage with carbon spar caps was NOT Don Edberg's. Apologies to
Don (who has written and flown great stuff over the years).
Is there an RF synthesizer that works with the Futaba 9C transmitter (not
the 9ZAP)? Nothing appears to be available directly from Futaba. Some folks
claim the Spectra module (Hitec) works but with some compatibility issues -
but
then things aren't 'legal' for contests.
Anyone have any
I have the evidence in my workshop that the stock wing structure is
apparently not up to even moderate winch launches. It was a great, no,
terrific flying sailplane.
Huh?
Actually. I saw many Mirages flying when they first came out and don't
recall anyone breaking them on winches at that
I'm sure most folks on the exchange are aware of the history but in light of
the commercial implications maybe it's worth reviewing. Not necessarily in
chronological order, or as the participants may have seen it. Just comments
from an observer
The development of the S, SD, SA and AG
This isn't exactly a drop-dead topic but does anyone have a trick for taking
the curl out of mylars before you first use them? It settles down after a
couple of cycles but that first layup is a bit of a fight. Tied them down and
used a heat gun this AM and it helps but
TIA,
- Dave R
Thanks for the suggestions. This roll of mylar has been in the box for some
time (couple of years) and took a hard set. Results so far:
Tape down the mylar and use a hot air gun - minimal effect
Iron the mylar on the bench with a bunch of pressure - minimal effect and
easy to scratch
First kit sailplane was a Javelin ~ 1972 (??). Rolled plywood fuselage,
built up D-tube wing, standard class. Designed and kitted by Bob Boucher of
Astro-Flight (I think). Got Levels 1 and 2 and then flew it away over the
mountains out at SBDO at one of our early ISS events. Great plane and
One of the guys in the club has had one of the little ball and tube units
for some time. (The RS unit uses the same principal - it's simply differential
pressure similar to a pitot tube.) When he's out there and we're about to get
blown off the field, we check it just to see how manly (or
Wind Meter!
Get this part $9.99!
It even has a LED flashlight in the bottom. Smart device and made so that
it
can bang around in your flight bag with nothing to get damaged.
Yup, an upcoming RC Soaring Digest Review ;-)
Do you have a specific part number? I went looking for this
Hi All, Here's the info on the Wind Meter: Radio Shack's info: Digital
Sport Wind Gauge with Built-In Flashlight Catalog # 63-1119. Happy flying,
Jim
Yup, that's the one. Looks like a really neat unit but it's discontinued
(verified at local RS this PM). So if you can find it on the shelf,
There appears to be an alternate supplier for the discontinued RS unit but
at ~ $20:
http://www.science-city.com/diwiga.html
For about 2X there's the La Crosse Technology EA-3010 Handheld Wind Meter.
At $40 (from several retailers) it's about the lowest priced unit using
anemometer
In a message dated 11/22/2004 9:53:27 AM Central Standard Time,
[EMAIL PROTECTED] writes:
I still think that this is your real problem - If you have to slide your
finger under the mylar to get it off, you may have a problem. Not the
vacuum,
not the foam. I told you at the very beginning
If the dents are being made any time after the wing is bagged, then they
should steam out.
Yes, most of them will steam out quite easily. Actually, all it takes is a
hot air gun.
The few that still show up (only with the last batch of 15psi foam) are much
more difficult to get out.
I don't think you've shown any evidence that excess vacuum causes surface
defects. You should at least have a theory as to how that happens.
The idea was that the lower compression strength foam has a higher
displacement response. While testing the foam, it's very obvious that the
Well, maybe I can bring closure to this blasted 'worm' thread I started some
time ago. Just finished several things and the result is not very conclusive
nor very satisfying. Nickel version:
15psi or 25psi foam at 10in Hg vacuum - no surface defects in any samples.
Same result with either
Does anyone have experience with RCDirect's Berg designed Peel and Stick
antenna? Looks like an interesting approach for DLG and/or getting the antenna
away from the inside of carbon tail booms. Not quite sure why such a very
specific tag length (5) is emphasized but any comments and/or
Ever want an Instron in your basement? I did.
Or an MTS.
Actually, I've had an old creep tester down there for a while.
Right next to the wind tunnel.
Very geeky.
My apologies - it should have been reported as compliance.
- Dave R
RCSE-List facilities provided by Model Airplane
The foam I use today is exclusively Foamular 250 and Foamular 600. I agree
that it makes no sense to use Foamular 150 or the equivalent blue foam (Dow
score board) if Foamular 250 or Dow square edge are available. There is
almost no difference in weight but a noticeable difference in
Following up on compression strength of foam for vac bagging, picked up some
Dow Scoreboard in Tulsa, lugged it back to the wilderness, and then panicked
when it measured slightly lower bulk density than Owens Foamular 150.
However, a check of the Dow website indicates Scoreboard, Square
Update on the foam 'worms' question raised several weeks ago. Many helpful
hints were posted and most have been run to ground. The problem is definitely
in retreat so it seemed appropriate to share what's been learned.
One source of the problem appears to be defects in the foam - either
Are there automatic / peak detection chargers that will ramp down
enough to put a small enough charge (C/10 or so) on the tiny 200 mAh
NiMH (yep, quad A) batteries I'm using in HLG? All the ones
I've found so far run at 100 mah / C/2 for these little buggers. Even
wall warts at 50
All was well till I crashed my Wonderful Ava-Gea...Two of the cells failed
at the same time..They had been charged for a couple months on a Sirius
Smart charger..So I blame the cells and not the charger...
Although the Sirius charger is a great field and bench tool, it really helps
to have
Also keep in mind that the EOS body will accept the full line of EF-series
lenses with a lens factor of 1.6 - e.g. if you have an existing 300mm it now
looks like a 480mm. Makes it handy for switching back and forth between film and
digital bodies.
Either way, a 300mm zoom is a reasonable
You're right - the Logic I was flying against on Sunday was holding
back, but he could have outlaunched me by 50 feet, easily. I have that
filed away in the category of keeping it interesting - I want to find
a zip size that keeps everyone competitive, doesn't give someone a huge
launch
SLNT has been doing this for a number of years for both their monthly
contests and for TNT. We did it a couple of times for HLG at Last Fling (Tulsa)
several years ago before DLG was developed. Using constrained ZIP lines was
discussed in RCSD about 6 years back. SLNT simplified that quite a
Perused the local WM this evening and ran across some interesting carbon
arrow shafts and was wondering if anyone has tried these for HL or SAL.
6 years ago I made my HLGs with carbon arrow shafts. Worked fine until DLG
came along - the torque would split the uni arrows. However, the
While on the subject, what is a good trickle charger and where can one be
purchased? Are there plans available from which I could build my own?
I've had very good luck with the Schumacher brand solid state chargers (also
at Wal Mart). They have a connector you can attach to the battery to
#2 Who carries a 300mAh battery pack for a handlaunch plane ( I
thought SR Batteries, but their 300 mAh pack is 1/2 AA size, too big
for the Salsa) I need a 2/3 AAA size NiMH pack
Try Batteries America. Go to R/C Hobby tab for pre-wired packs or Cell tab
for individual cells.
I have used a glue known as PFM, I think it also is known as shoe goo.
This adhesive, although strong and secure, dimples the top surface of the wing.
Not sure if its attacking the foam, but it certainly distorts the top
surface
Two ideas that worked reasonably well:
1) Goop has great
As you know from my video, I place the cores in the mylars, then the
mylars go inside a release film/breather envelope, this then goes in the bag. The
beds are outside the bag. I can't tell for sure from your post, but it sounds
as if you might be putting the beds inside the bag or perhaps
A few posts queried the Mano Y Mano comment. The epistemology derives from
boxing and martial arts. Literally hand to hand but generally used to denote a
one on one competition or challenge in an athletic event, typically boxing,
martial arts or wrestling. Widely used by gamers these days.
In a message dated 10/28/2004 11:47:26 PM Central Daylight Time,
[EMAIL PROTECTED] writes:
It might be worth building a DLG with a Clark-Y airfoil; I don't think =
anyone's done it so I don't think we can say its that much worse than =
any other foil. (I suspect it will work rather well,
In a message dated 10/28/2004 11:47:26 PM Central Daylight Time,
[EMAIL PROTECTED] writes: Or maybe ask the guys at the Rose Bowl
soaring Festival few years ago who got their heads handed to them by JW
flying a 2-channel foamy 2-meter beater how they feel about
this issue.
Yup, I was
Thanks for several useful suggestions on the foam 'worms' problem a week or
so back. Based on input from several responses, it looks like the problem is
under control.
Basically, it appears to be the wax. Or, more correctly the waxing
technique. I had been triple waxing and then bagging
In a message dated 10/29/2004 6:48:30 PM Central Daylight Time,
[EMAIL PROTECTED] writes:
I noticed in the original post that you were using West Systems 205
hardener. Perhaps you meant to say 206 hardener. The 206 hardener is
appropriate for vac bagging. The use of 205 (much faster acting)
Unsolicited testimonial.
Been using a Sirius Pro and a Sirius 100 (for DLG) for several years now
(old enough that the Pro is the earlier 1000mA version).
I have NEVER had a problem with a Rx or Tx pack while using these chargers
at the field or on the way to the field. They're
As you probably have found out, unless under the thumbs of
someone who can find lift, work it, and come home to the spot, airfoils
don't provide any value beyond conversation.
Ever tried flying DLG with a Clark-Y or an NACA6412 vs a Drela foil?
You just might see a spot of difference - like
In a message dated 10/24/2004 11:39:33 PM Central Daylight Time,
[EMAIL PROTECTED] writes:
It's never to early to get ready for next season. Having just had a small
cancer removed from my ear trust me, a good hat is a wonderful
thing. Check out:
I just got the 2004 NATS edition of Model Aviation and would like to
compliment Jim on his excellent coverage of the 2004 Soaring Nationals. Nice
job JB...You're volunteered for 2005!
Amen!
Outstanding coverage. Great write-up and photography. Thank you for making
it a really terrific
Need some advice on a vacuum bagging problem. It's more cosmetic than
structural but I can't seem to get rid of the effect.
Just about every time I bag a wing, I get what look like worm tracks on the
surfaces. It's primarily on the upper surface but sometimes shows up on the
lower.
These
Thank you all for the suggestions but nope on the issues suggested. These
are standard mylars (ACS 40 mil), triple waxed. Standard wet-out and layup,
etc. No wrinkles in the mylars, cloth bunching, etc. There's nothing unusual
about the setup. I've looked over Phil's video several times to
The best you're going to get after the release from the tow line is a
ballistic trajectory. That is, under the best conditions, the amount of kinetic
energy you have at release ((velocity at release)^2) will be converted to
potential energy (altitude) minus the final kinetic energy
Does anyone have ideas for transferring art work out of an ink jet printer
onto mylars for bagging wings, etc.? Seems like this should be do-able by some
transfer method but no luck so far. Kind of a pain to cut out a mask for
spray painting. There must be an easier way.
- Dave R
In a message dated 10/20/2004 11:36:07 PM Central Daylight Time,
[EMAIL PROTECTED] writes:
Hey guys, you have provided a great deal of learned opinions about launch
and zoom technique, how to determine altitude, etc., but no one answered the
simple question:
How many seconds from release to
Good old fashioned Turtle Paste Wax works pretty good. Only stuff in town
that's pure wax without a cleaner of some sort. Not 100% carnauba but has given
the best releases so far.
- dfr
Maybe this is already well known but ...
If you hang vinyl min-blinds (1" or larger), save the extra vinyl slats. Or
go buy the cheapest set you can find at Wal-Mart. Or just sneak a test strip out
of that set in the family room.
Cut the slats into about6 inch sections and you've got
Thanks all for the release wax suggestions, on and off line. Mother's CA
Gold worked out pretty well. The label says it's a 'cleaning wax' so I assumed
it has a mild abrasion agent in it but
Will try some of the other suggestions this winter (Dolphin's, Skyking,
Johnson's).
Use to use
There must be more than one Mother's CA Gold wax. Mine says the
following on the can lid;
Mother's
California Gold
Ultimate wax system
natural formula
pure carnauba wax
phase three
non abrasive formula
on the back of the can it has the product number; 05550
**
Oops. The only stuff
I know this went around a while ago but I've lost the files.
I'm looking forsuggestions for a release wax for vac bagging and/or
molding. Out here in the boonies it takes a while to get the real stuff and my
last tub went dry before I could use it up.
I recall suggestions for Mother's or
Converted my Laser 3MC to RDS two years ago. Installation is still very
tight, clean and functional. Also a noticeable decrease in wind noise post
conversion.
There are sources for the couplers that work well and adapt to most common
servos. The locking screw should be sufficient but to
This is a bit droll - sorry.
This data doesn't address the specific question of the Ford long shaft winch
with an open class ship but it's an interesting look at some launch
conditions and suggests some of the things you can do with a data recorder. I'll put
the FDR in my Laser sometime
In a message dated 9/28/2004 2:34:50 PM Central Daylight Time,
[EMAIL PROTECTED] writes:I carefully reviewed the correct direction to turn
in a thermal. Learned that by studying which way the water rotated in the
toilet. Exactly why I was sitting on the floor wistfully staring into the
Good comments all around. I certainly agree with the suggestion that it
works best if those who have ideas become CDs and try them out to get feedback.
Tim's done that. I've done that. Many of the others posting have done that.
And we each come to somewhat different conclusions about how
There was a time ( ~ 25 years ago) when a really good SoCal pilot named
Mark Smith (Windward, Windfree fame) could do time and landing on the nose just
about every time.His technique was to bring the plane down to ground
effect height, kiss the nose to the earth at the exact time (stops the
Just shipped a 2 meter via UPS and it seems to have survived well. I've
never had shipping damage like Pat describes but have to assume I've been lucky?
Barry's shipping containers work very well. Luan is a good idea as is double
boxing with a lot of conforming foam.
Another thought - what
In a message dated 9/10/2004 11:26:23 PM Central Daylight Time,
[EMAIL PROTECTED] writes:
I have decided to simplify the setup, since there's an access hatch for the
RX, I will just unplug the battery lead for charging and plug it in for on.
If you don't have a switch in the
circuit, it
In a message dated 9/9/2004 6:26:08 PM Central Daylight Time,
[EMAIL PROTECTED] writes:
Heck !!
I am goin to Texas for the TNT.
its easier to figure out...
And another good thing about TNT - it's the same weekend as the OU-Texas
football game. Lots of hot air generated for thermals.
Got a bit of a debate going locally on the merits of dual rate and
exponential. Some folks like it, some don't. Any comments from the exchange on
this one? We were thinking about doing an overview article for RCSD but the
opinions are mixed and strong. Looking for any feedback from users or
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