SCAT Electronic News 1 Jan 2001 - New Years Day ! issue 524
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SCAT Electronic News 1 Jan 2001 - New Years Day ! issue 524
Table of Contents
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Chip tuning the bunt, or ABS - van Wallene
Well tuned models - Andresen
reminder - THE DESERT TEAM CHALLENGE - Bogie
SW Regional considerations. - Lidberg, Andresen et al
Latest Luddite News
Chip tuning the bunt, or ABS
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Author : This email address is being protected from spambots. You need JavaScript enabled to view it.
Hi all,
In reply to Aram Schosberg's comment on decalage and towhook position, I can
announce that the continuous change of decalage during speed up and bunt is
already a reality.
My latest electronic timer does this. Rene Limberger tested one of my
earlier versions and found out that in still air this can give remarkable
improvements in launch height. In practice at hook unlatch the decalage is
relatively low (say 2 mm up at stab TE) and progressively moves up to a
much higher decalage of about 10 mm (!). The advantages were evident:
-In still-air there is allways high line tension during the whole
speed -up phase, and therefore higher speed.
-The towline does not have to be pulled down at the end of the speed -up
phase to keep the tension (speed) --> gain" body length " 2 meter
-The model can be released at towline angles close to 90 degrees instead of
the optimum 70 degrees (see M&K article in Sympo)
-The angle of the model on the towline is more 'nose up' at release,
thereby obtaining vertical position for the cruise faster.
-The ballistic (low drag) cruise can be started earlier, so more energy
efficient (speed ---> height).
Rene is developing an animated bunt sequence (ABS) programming facility on
an Ipaq palmtop. I take care of the microcontroller bit in the timer.
The decalage (stab angle on vertical axis)) is graphically
represented by a curve versus time (horizontal axis). The whole sequence of
decalage can be 'kneaded' to shape from towhook unlatch all the way to glide
mode. The curve is sampled in the Ipaq and then uploaded to the
microcontroller. This way of programming the decalage gives noticable
advantages in still air. In wind / thermal conditions a more classical way
of decalage settings works fine as well.
More on this subject later (Sympo article maybe ....)
Best wishes for 2001 to all, Allard van Wallene
Well tuned models
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Author : This email address is being protected from spambots. You need JavaScript enabled to view it.
Music wire (as sold in a music store) is the obvious choice for weird sizes.
It's generally stainless of high tensile strength and available in many
diameters. Have found similar product sold in sporting goods stores as
fishing leader. Bought some .014 &.029 a long time ago.
A trip thru the Phoenix Yellow Pages a long long time back resulted in a
call to a wire vendor who would provide any diameter in .002 increments in
coils or straightened. This was sold by the pound.
Yet another source was a Wholesale Jewelry/Watchmaker Supply. They also
have rectangular cross section as used in springs. At least they had it in
the windup watch era.
Happy New Year to All,
H
THE DESERT TEAM CHALLENGE
============================
JANUARY 6 AND 7, 2001
TAFT SITE
YOU ARE INVITED TO ENJOY A WEEKEND OF LAID BACK FAI COMPETITION
BRING:
F1A, F1B, F1C, F1G, F1H, F1J MODELS.
BBQ FOOD, TABLE SERVICE, TABLE AND/OR CHAIRS, CHARCOAL AND A BBQ.
CONTEST:
THREE ONE HOUR ROUNDS STARTING AT 1 PM SATURDAY.
FOUR ROUNDS SUNDAY MORNING STARTING AT 8 AM.
LENGTH OF THE ONE HOUR ROUNDS WILL BE ADJUSTED ON INDIVIDUAL NEEDS.
WE WILL RUN TWO TO A TEAM, DEPENDING ON NUMBER OF ENTRIES.
ENTER TEAM NAMES ON THE SCORE SHEETS FOUND ON THE TABLE.
ALSO SIGN THE INSURANCE FORM.
RECORD FLIGHT TIMES ON THE SCORE SHEETS.
TIME YOURSELF IF NECESSARY.
GATHER:
WOOD FOR THE BONFIRE. IT IS ESSENTIAL THAT WE STAY WARM AFTER THE BANQUET.
LOOK FOR WOOD WHILE RETRIEVING AND GO AFTER IT AFTER THE ROUNDS ARE IN.
BRING WOOD FROM HOME. PALLETS MAKE GOOD FIRE.
BANQUET:
START THE CHARCOAL. SUNDOWN IS 5:02 PM.
SET THE TABLES AND THE SHARE TABLE, SPREAD THE FOOD.
WATCH FOR KIT FOXES.
TROPHIES:
WILL BE AWARDED SUNDAY NOON.
COST? A fiver should do it.
BILL BOGART
4837 Los Robles Ave
Hacienda Hts, CA 91745
626-333-1194
This email address is being protected from spambots. You need JavaScript enabled to view it.
SW Regional considerations.
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Author : This email address is being protected from spambots. You need JavaScript enabled to view it.
Roger,
This is an excerpt and Map of Al Lidberg's message re SouthWest Regionals,
the 1st America's Cup event of the Millenium, Jan 13 & 14, 2001.
Note:
1. Enter field from SE corner only. Toltec Rd is Exit 203 on I-10.
2. Location of flight lines.
3. Peter Brocks to be on field Thurs to direct traffic.
4. ROW again.
5. P-30 props by GizmoGeezer will be available & declared OK by AMA CD
Lidberg.
6. Possible BBQ vendor.
See you there,
Happy Millenium,
H
>From: This email address is being protected from spambots. You need JavaScript enabled to view it.
>Subject: Re: SW Regional considerations.
>Date: Sun, 31 Dec 2000 14:40:34 EST
>
>Steve and I took a look at the field last Tueday when we went to Eloy to
>arrange for the ROW pond water.
>
>As I understand Elmer & Peter's recommendations, the attachment shows the
>flight line 150'+ south of the intersection of the diagonal paths, with
>parking another 150' or so south of that - is that about right? The
>attachment also shows the NE entrance blocked off, which can also be done
>with signs. Believe Peter said he's be at the field Thursday, 11 Jan to
>help
>direct early arrivals - Steve & I [plus John Patton?] will be there early
>Thurs also to build the pond at the far east end of AMA flight line, with
>water delivery planned for about noon.
>Iwas surprised about the feedback I got on the FreeFlight mailing list
>about the GizmoGeezer re-pitched P-30 props - a few folks were strongly
>stating that these were illegal - including Dave Linstrum, but, they are
>commercially available - and we expect them to be on sale at the field for
>those who may have missed them.
>
>Happy New Year to all!
>AL
[the map will be in the separate attachment item]
Luddite Motto
=============
"Life was better before sliced bread"
.... from Luddite.com ... where else !!
................
Roger Morrell
