вопрос: если закрепить плечо и измерить динамометром силу изгиба плеча
(скажем 10 кг - в моем случае), то сила натяжения тетивы у лука (при том же
уровне изгиба будет вовсе не 20 кг, как можно было бы подумать, а те же 10 кг.
Объяснить этот феномен с точки зрения физики я не способен.
Короче, говоря надо использовать стеклопластик, как это делают все нормальные
люди. Поскольку сделать из стеклотекстолита что-нибудь стоящее мне не
представляется возможным, то и стимула совершенствовать конструкцию у меня
пока нет.
Зато появилась идея создать сайт, посвященный стрельбе из лука,
вероятно первый в России. Да, заманчиво, черт возьми, да вот незадача - опыта
в установке какого-нибудь APACHE под Unix'ом да и самого Unix'а (а под чем же
еще?) у меня нет. Может поможет кто в 5030?
=== Cut ===
С уважением, Taras.
---
* Origin: Yo-ho-ho, and a bottle of rum! (FidoNet 2:5030/232.14)
Hello, All!
=== Cut ===

Приложение
I
Кому интересно - моя переписка с людьми из REC.SPORT.ACHERY, касательно
изготовления плечей:
________________________________________________________________________
From : "mcoleman"
To : "Taras"
Subject: Re: limb making
Taras,
I have just finished moving from Houston to San Antonio so my files are
packed but in general:
I build a one piece 60 inch recurve with rather narrow limbs and fairly
aggressive recurves. This gives me a recurve that weighs about 20 ounces
has long working limbs due to the 18 inch riser, is smooth drawing out to
about 31 inches and shoots a 675 grain arrow at about 190 feet per second.
In order to do this with the narrow limbs, it requires a thicker core than
your typical recurve. My wood to glass ratio averages about .44 glass to
wood. In a typical 60 pound bow, this would be
2 each .040 clear glass laminations for facing and backing
2 each .120 actionwood laminations with .002 tapers
1 each .030 colored coretuff lamination between the wood cores
( I use this coretuff to provide dimensional
stability due
to my narrow limbs and since I shoot fastflight
strings)
for a total thickness of .350 at the butts. On my form with the 18 inch
riser, this works out to about .330 inch thickness at the fadeouts and .250
thickness at the nocks. My limbs are only 1.125 inch wide at the fadeouts
and are only .6 inch wide at the nocks. I use a straight taper from the
fadeouts to the nocks.
On a typical recurve with limbs that are 1.5 to 1.75 wide at the fadeouts,
the wood laminations may only total to .120 to .150 inch thick.
Lots of luck and don't hesitate to e-mail if you have questions.
Mike
---------------------------------------------------------------------------
А здесь мне советуют, где достать ламинат:
___________________________________________________________________________
Hi, All !
At last I've made my bow. But what i am upset about is my limbs are
too weak. The bow is 49" long. Each limb is 21" long, 1.25" wide at
the riser and about 0,6" at the nocks. I used straight taper. Each
limb has the same width all the way - 0,173" (4.4 mm)- 4 layers of
ash
wood (0.6 mm) and 2 layers of fiberglass (1 mm). They have fair
recurves at the ends. The limbs were kept in a heating box with 2
lamps inside at 70 degrees of C. The bow has a drawing weight equal
12.1 lb. I remember quite exactly that sport 39lb bows (when i shot
from a bow being a sportsman) have similarly the same limb theckness. I
think the problem is in fiberglass - i have fiberglass that used in
radio industry for making circuit boards like inside computers
(glass
cloth soaked with resin and pressed). I couldn't get any glass with
fibers going straight in one direction. Any ideas?
Besides i'm interested in method of seting limbs on the wooden
gripe of
the bow (i used 2 bolts clamping the limb and the gripe together).
Russia, S-Petersburg
Best regards,
Taras mailto:cartel@pop3.rcom.ru
********************************************************************
Reply:
I couldn't get any glass with
>fibers going straight in one direction. Any ideas?
have you been looking at boat shop (windsurfers were using it there
are boats in st pertersburg )
or car repair (hardly unidirectionnal but still)
carbon couls work
an other idea : I took some unidirectionnal carbon fibers from old
carbon arrows (beman) by burning them (maybe not so good an idea)
I knew of one possible source helicopter aircraft manufacturers (if
you know someone at the factory....
>Besides i'm interested in method of seting limbs on the wooden
>gripe of
>the bow (i used 2 bolts clamping the limb and the gripe together).
works perfectly if bolt are strong enough
>Best regards,
> Taras mailto:cartel@pop3.rcom.ru
Otherwise importing it seems the eaiest (if not cheapest) solution.
can look for a shop in paris having it (may not ship to russia though)
Good luck
Philippe
__________________________________________________________________________
II
А вот интересные URL:
HTTP://WWW.MARTENARCHERY.COM/FAQ/FACTS.HTML
HTTP://WWW.STICKBOW.COM/STICKBOW/SELFBOWS/ (о том, как сделать детский лук и
не только, рекомендую)
HTTP://WWW.DATASYS.NET/~MYGASKINS/ARTICLE1.HTM
HTTP://WWW.PIONEERPC.COM/PRIMITIVEARCHER/ARTICLES/
HTTP://WWW.STUDIONET.IT/RILLBACK.HTM
HTTP://WWW.ARCHERYWEB.COM/ARCHERY/CRECY.HTM
HTTP://WWW.NCMC.CC.MI.US:443/ESL/KORARCHERY.HTML и CROSSBOW.HTML
HTTP://WWW.CYBERHIGHWAY.NET/~KC7MWA/DFOX.HTML (про арбалеты)
HTTP://WWW.ALCHEMINC.COM/CROSSBOW.HTML (про арбалеты)
HTTP://WWW.BINGHAMPROJECTS.COM/INDEX.HTM (можно заказать наборы по
самостоятельному изготовлению лука - давайте ваши денежки :)
HTTP://WWW.STUD.HIS.NO/~MORTEN-B/A_HIST.HTML (краткая история archery)
HTTP://WWW.BOWNET.COM
HTTP://THEGLADE.CO.UK
HTTP://WWW.UTORONTO.CA/ARCHERY/FAQLIST.HTM
HTTP://WWW.MINDSPRING.COM/~BOWYER (как делают настоящие луки step by step в
фотографиях (Harrelson Traditional Archery,inc))
=== Cut ===
С уважением, Taras.
---
* Origin: Yo-ho-ho, and a bottle of rum! (FidoNet 2:5030/232.14)

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