MegaTech R/C Real World Helicopter Series Bedienungsanleitung PDF herunterladen (Seite 4)

We welcome your comments and suggestions. Letters should be addressed to "Airwaves," Model Airplane

News, 100 East Ridge, Ridgefield, CT 06877-4606 USA; email [email protected]. Letters may be edited for clarity and brevity. We

regret that, owing to the tremendous numbers of letters we receive, we cannot respond to every one.

LOVE THAT LITHOPLATE

In his February 2001 "Scale Techniques"

column, George Leu mentioned 0.005 litho-

plate for detailing a Midwest Texan, and

this material was also mentioned in a

review of Balsa USA's Cub (April 2001 issue).

I gather that lithoplate is a thin, soft alu-

minum sheet, but what is it exactly, and

where can I buy it in various thicknesses?

I'd appreciate the info; I subscribe to the

magazine and read every issue. Thanks,

[email]

RAY SCHMIDT

Ray; lithoplate is a thin aluminum sheet mater-

ial used by printing-press operators to print

newspapers and other publications. After a run,

the sheets of lithoplate are set aside, and when

the bins are full, they are sent to be recycled.

Each plate (sheet) is about 18x24 inches; you

can buy used sheets for a song; I paid about 25

cents apiece! I bought a stack several years ago

at a local print shop for 20 bucks and still have

enough to last a lifetime! The ink on the plate

must be cleaned off before you can use the

material, but it is water-soluble so cleaning is

very easy. Use a mixture of hot soapy water and

a little rubbing alcohol. The aluminum is very

thin (0.005 to 0.010 inch) and can easily be

cut with a pair of scissors. The material has

been hardened slightly by the printing process,

but if you heat it quickly with a torch, you can

anneal it to make it easier to bend and form. If

you use it to make flat panels on your model,

rubber cement or spray adhesive works well to

hold it in place. Hope this helps. GY

BIG BIPLANES

In the April 2002 issue, I read with great

interest your "Thinking Big" column on

biplanes. I am currently

building a 1/6-scale

Boeing F4B-1, 1930s

Navy biplane from an

RCM plan. The upper

wing has a 60-inch span

and 10-inch chord. The

bottom wing has a span

of 48 inches with a 71/2-

inch chord. The stagger

is positive, with the

leading edge of the

bottom wing set 55/8 inches aft of the lead-

ing edge of the upper wing. The decalage

angle is designed to be slightly negative,

with 2 degrees positive incidence on the

bottom wing and 1 degree positive inci-

dence on the upper wing. Since the upper

wing is much larger in area, it will have

much more lift than the lower wing. Both

airfoils are essentially flat on the bottom.

Even though the wings differ in span

and chord, shall I still calculate the mean

aerodynamic chord (MAC) and balance

point in the same way as shown in Figure

3 of that article, with the balance point 25

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10 MDDEL AIRPLANE NEWS

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