Rocky's Model Engines
Materials Needed for 1/2 Scale Model of 1 HP Horizontal R&V
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1/2 scale of 1 HP R&V Kit
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This is a consolidated "shopping list"
Length are Estimates: allowing 3/16" for each part section and finish work
All measurements are in inches unless otherwise noted
Outside dimensions (width, diameter) are listed first followed by lengths.  This list is truly just a guideline. Consider engine application, finished look of model, cost for small amts of stock vs. larger amts, etc.

STEEL
Cold Rolled 
  • 1 3/8 x 21/23
  • 1 1/16 x 29/64
  • 5/8 x 14 21/64
  • 9/16 x 3/4
  • 1/2 x 5 9/64
  • 3/8 x 4 19/64
  • 5/16 x 1 11/16
  • 1/4 x 4 35/64
  • 3/16 x 2 1/8
  • 1/8 x 1/2

316 Stainless

  • 3/4 x 4 1/16

Flat Bar

  • 1/2 x 1 x 4 3/16 L

Cold Rolled Sheet

  • 16 Gauge x 3/8 x 2 3/4 L                  

Hex

  • 3/8 x 7/8

Square Key

  • 1/2 x 3 15/16
  • 5/16 x 1 1/64
  • 1/4 x 11/16
  • 3/16 x 2

BRASS

Round 

  • 1 3/4 x 1 1/4
  • 7/8 x 3/4
  • 3/4 x 1 25/64
  • 5/8 x 1 9/16
  • 1/2 x 1/2
  • 3/8 x 1 1/4
  • 1/4 x 5 9/16
  • 3/16 x 2 7/8

Square

  • 3/4 x 1 1/4

Hex

  • 3/8 x 2 3/8

Flat

  • 5/16 x 1
  • 1/32 x .268" x .78"

Pipe Nipple

  • 3/8 x 1 1/2

Pipe Plug

  • 1/8

Piano Wire ( all 3' lengths avail. at local Hobby Shop)
  • .016
  • .020
  • .025
  • .035
  • .055
Nuts ( all w/ lock washers)
  • 1 6-32
  • 2 8-32
  • 11 10-32
  • 1 1/4-28 (lock washer optional)

Screws (all w/ lock washers)

  • 2 6-32 x 7/8
  • 1 4-40 x 3/8 (lock washer optional)

Bolts 

  • 2 10-32 x 1 (w/ nuts)

Allen Socket Head Set Screws

  • 1 6-32 x 3/8 (steel)
  • 2 10-32 x 1/4 (steel)

Threaded Stock

  • Steel 8-32 x 1
  • Brass 8-32 x 2

Pipe (Brass, Stainless or Aluminum)

  • 1 3/4 x 6 1/8

Babbit Bearing Material

  • 1 x 3
  • 3/4 x 1 9/16
  • 21/32 x 7/8

Tungsten Ignitor Points

  • 2 1/8 x 7/16

Piston Ring(s)

  • 1/8 wide x 1 5/8 OD (available Model Engine Suppliers)

Electrical Supplies

  • Coil: appprox 3.2 ohm (can be found thru Model Engine suppliers) 
  • 12v battery
  • Wire: 2'
  • Female Connectors ( size corresponding to battery electrodes)
  • 3" of Shrink Tube

Wood

  • 3/4 x 2 3/4 x 52 L

Dimensions for balancing engine are included in plans

Unanswered Inquiries

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