Unlimited AllStars

4412 W. 6th Ave.

Beaver Falls, PA 15010
(724) 462-7440

Exec Director: Mark Bergfelt


  1. Calculating Displacement / Declaring Weight

    1. The bore will be measured with dial calipers and the stroke with a suitable travel indicator. (Reciprocating engines only)

    2. The following formula will be used for calculating displacement;

    3. Always round up to the nearest whole cc when calculating minimum weight.

Always round up to the nearest whole cc when calculating minimum weight.

BORE X BORE X STROKE X .7854 X 16.39 = CC of engine.


Engine Type

Base Weight

X

 lb. Per “A” cc

Max Equation cc

Engine size where must weight 430 lb

minimum

Rotary valve or Reed valve Two Stroke

Small

Large


Multiple


200


X


1 cc


199cc



200– 255 = 400lbs

256 – 275 = 430lbs

230 – 275 = 430lbs

Piston Port Two Stroke Engine

170

X

1 cc

305 cc

260 – 305 cc

Flat Head Four Stroke Engine

190

X

3 cc

500 cc

Not Applicable

Overhead Valve (OHV) Push Rod Four Stroke Cycle Engine

200

X

2.5 cc

500 cc

500 cc

Overhead Cam Four Stroke Cycle Engine Single Cylinder

Multiple Engines/Cylinders Up To 459 cc

205

X

2 cc

500 cc

450 cc – 500 cc


450 cc – 459 cc

Single Rotor Rotary (Wankel) Engine

105

X

1 cc

295 cc

Not Applicable



    1. Competitors must declare their weight and display it next to their front number in such a manner that the scale person can easily see it.

    2. Competitors entering a UAS race with a Wankel engine will be required to provide literature from the manufacturer that positively identifies the engine and clearly indicates the displacement.









Terms and Conditions


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