Nitro Boat Imformation
RTR 18 HYDROPLANE RULES OF COMPETITION
Abstract: The purpose of this document is to classify the rules for Specialty Class “RTR 18
HYDROPLANE” in District 14 IMPBA.
The intent of this class is to provide an attractive class of racing to foster new membership to the
model boating community. This is accomplished by providing a place for new boaters to
experience the hobby of model boating, yet be an attractive class to even the most seasoned
racer. This intent can be met by making the class both low in cost using readily available high
volume production boats and parts, and by specifying rules to maintain class intent. The following
sections shall support the intent of this class.
2 LEGAL BOATS
A legal RTR 18 HYDROPLANE boat must meet the following criteria:
2.1 It must be intended for the R/C hobby market.
2.2 It must be available from hobby shops and e-commerce nationwide, or have been available
from hobby shops and e-commerce nationwide during or after 2007.
2.3 The boat/engine/radio system must be available as a ready to run package retailing for a
maximum of $400.00.
2.4 The boat as designed must use nitro power not to exceed 0.189 cubic inches (3.0cc).
2.5 The hull must be a full-body hydroplane with rear wings, at least 25 inches in length and no
more than 33 inches in length.
2.6 It cannot resemble outrigger hydroplanes, tunnel hulls or catamarans.
3 ALLOWED MODIFICATIONS -- You may change parts, and or modify a legal boat to increase
reliability, improve drivability, or to make your boat unique, ONLY if the modification is listed below.
3.1 You may paint and decal your boat however you wish - in fact, we encourage it! (No profanity
or other disparaging remarks)
3.2 You may modify or replace the cowling to effect air flow to the engine compartment, or to suit
a different look.
3.3 You may use any control equipment including any radio box, electronics, linkages, and battery
may be used, as long as placement is not deemed advantages towards the Center of Gravity of
3.4 You may replace the engine with a glow engine up to 0.189 cubic inches (3.0 cc) that is or was
original equipment from a legal boat made by the same manufacturer.
3.5 You may use any flywheel or backplate. Belt starting is allowed.
3.6 You may use any glow plug.
3.7 You may use any glow fuel (for example, with any nitro percentage).
3.8 You may use any turn fin, any rudder, and any brackets to support them. You may sharpen and
polish all hardware.
3.9 You may change any silicone part, such as the fuel line or pipe coupler.
3.10 You may modify or replace the fuel tank with any tank.
3.11 Weight may be added to balance or stabilize the hull.
4 ILLEGAL MODIFICATIONS
4.1 You may NOT perform any of the following modifications.
4.2 You may NOT modify the engine. You must use the carburetor that comes with the engine. You
may not modify the carburetor.
4.3 You may NOT modify the hull or remove detail parts. Repairs and preventative bracing are ok
so long as they are not deemed to enhance performance.
4.4 You may NOT run without rear wings.
4.5 Additional wings, spoilers, air dams, or fins if deemed to stabilize the boat at speed are NOT
4.6 You may NOT use a 3rd channel fuel mixture adjustment.
4.7 You may NOT change, or modify the tuned pipe.
5 RACING RULES
Racing rules are per IMPBA rulebook unless as stated below.
5.1 Milling Procedure - In the effort to help group boats together on the start, and conserve fuel,
the Half-Mill course will be allowed.
5.1.1 You must complete a full out lap from the pits. Then, if you wish, you may cut the course from
buoy 6 to buoy 1 from the front stretch to back stretch only.
5.1.2 You must yield the right of way when cutting the course to any boat that has the chute.
5.1.3 You may NOT cut into the course in the last 5 seconds of clock time.
5.2 Heat races shall be 5 laps.
6 Rules Enforcement
6.1 The Contest Director for an event is ultimately responsible for enforcing these rules.