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Get started building with these basic tools
An easy, great looking color layout for maximum
visibility
Build swept back wings to avoid tail heaviness
Install your wings with bolts when the plans show rubber bands
How to build a straight fuselage
without
using a jig
How to build a simple cowl out of balsa blocks
Fixing construction mistakes
How to get longer run time from a Cox engine by
using a remote tank
Compatibility of various paints and finishing materials
Propeller selection guide for 2 stroke and 4 stroke glow engines
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robbie@balsaworkbench.com
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This isn't meant to be an
authoritative set of rules. It's just a helpful guide to get you
started in the right direction. These sizes are for glow
engines.
Just remember these simple rules.
FAST PLANE: Higher pitch, smaller diameter.
SLOW PLANE: Lower pitch, larger diameter.
A large, draggy plane such as an old-timer biplane can't be made faster
by choosing a prop for greater speed because of the excessive parasite
drag of the plane, so choose the appropriate propeller to let these
beauties fly slowly the way they are supposed to.
TWO STROKE PROPELLER GUIDE (original
source unknown)
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ENGINE SIZE
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STARTING
PROP
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ALTERNATE PROPS
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.049
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6x3
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5.25x4, 5.5x4,
6x3.5, 6x4, 7x3
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.10
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7x4
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7x3, 7x4.5, 7x5
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.15
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8x4
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8x5, 8x6, 9x4
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.19 - .25
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9x4
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8x5, 8x6, 9x5, 10x4
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.20 - .30
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9x6
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9x7, 9.5x6, 10x5,
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.35
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10x6
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9x7, 10x5, 11x4
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.40
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10x6
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9x8, 11x5
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.45
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10x7
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10x6, 11x5, 11x6,
12x4
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.50
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11x6
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10x8, 11x7, 12x4,
12x5
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.60
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11x7
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11x7.5, 11x8, 12x6
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.70
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12x6
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11x8, 12x8, 13x6,
14x4
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.78 - .80
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13x6
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12x8, 14x4, 14x5
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.90
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14x6
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13x8, 15x6, 16x5
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1.08
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16x6
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15x8, 18x5
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1.20
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16x8
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16x10, 18x5, 18x6
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1.50
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18x6
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18x8, 20x6
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1.80
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18x8
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18x10, 20x6, 20x8,
22x6
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2.0
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20x8
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18x10, 20x6,
20x10, 22x6
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| FOUR STROKE PROPELLER GUIDE (original
source unknown) |
| ENGINE
SIZE |
STARTING
PROP |
ALTERNATE
PROPS |
.20 - .26
|
9x6
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9x5, 10x4, 10x5
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.40
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11x6
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10x6, 10x7, 11x4,
11x5, 11x7, 12x4, 12x5
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.45 - .52
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11x7
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10x7, 10x8, 11x8,
12x4, 12x5, 12x6
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.60 - .70
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12x6
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11x7, 11x8, 12x8,
13x5, 13x6, 14x5, 14x6
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.80
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13x6
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12x8, 13x8, 14x4,
14x6
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.90
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14x6
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13x6, 14x8, 15x6,
16x6
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1.20
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16x6
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14x8, 15x6, 15x8,
16x8, 17x6, 18x5, 18x6
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1.50
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18x6
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15x6, 15x8, 16x8,
18x6, 18x8, 20x6
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