Home | General Information | Club Information | Members List | Upcoming Events | Club Meetings | Photo and Video Links | Race Results and Pictures | R/C Related Links | Contact Us | For Sale

Club And R/C Boat Information

General Information


Wichita R/C Power Boat Club races in District 17 of the North American Model Boat Association (NAMBA). District 17 is comprised of clubs in Oklahoma, Missouri, and Kansas.

Each club holds a sanctioned race at their local pond and each club carries insurance that protects both members and spectators at their race site. All members are required to follow specific safety rules as outlined by the NAMBA Rulebook for R/C Model Power Boats.


There are many different classes that modeler’s race in. Classes are divided by engine size, hull type and type of fuel used (Nitro, Gasoline and Electric). Typically trophies are given to winners through third place and there are no cash prizes.


About the Boats


There are two main categories of hull types. They are Hydroplanes and Mono Hulls.


The Hydro class is defined, as any hull that is not a monoplane. This includes Outrigger Hydros, Catamarans, Sport 40 Hydros, Multi-engine Hydros, Unlimited Scale Hydros, Classic Thunderboat, Outrboard Tunnel Hull (OPC).

Outrigger Hydros are currently the fastest of the racing classes and resemble a narrow hull with two sponsons attached by booms. The name is derived from the resemblance to the Hawaiian outrigger canoes.


The Mono Hulls are any V Bottom style boat. They can range anywhere from a very shallow V, as on a Crackerbox, to a very deep V, like a Jersey Skiff.


About the Boats (continued)


Catamarans are modeled after the offshore racing catamarans and resemble a hull where there is “channel” a between the running surfaces.


Multi-engine hydros are boats with multiple engines running simultaneously and can be either Catamaran or an Outrigger Hydro.


The Unlimited Scale Hydro class is comprised of 1/8 scale replicas of hydros that raced or are racing on the Unlimited racing circuit. The hulls are registered as to their trueness to scale and a trophy is usually given to the hull judged to be the most true to scale at most races.


Classic Thunderboats are modeled after 1950's and 1960's Unlimited Hydroplanes (round or shovel nose).  They are 48" long by 24" wide minimum and are to be painted "scale like "  They run 50 -60 mph and have great spectator appeal.  They would be a good entry level gas class boat because they can  be one of the more inexpensive boats to buy and run. Also, they are easier to drive because of the slower speeds - not to say they are not exciting to drive.  Also, because they are larger than most, they handle the waves much better.  They are powered by stock Zenoah 260 PUM gas engines, therefore, the speed differences between the boats is very small resulting in very close racing.  More money can't buy you a bigger/badder motor and thus more speed.


The OPC ( Outboard Performance Craft) class even though has a hydro hull it is categorized differently because it uses an outboard motor for its propulsion. These hulls resemble the tunnel hull boats that currently race on the IOGP circuit. These hulls are generally inexpensive and make a good beginners class.


The Mono hull class boat resembles the common “Deep V” hull and gets its name from its single riding surface. They are fairly easy to set up. For this reason it is also a good beginner’s class.


About the Engines


Each hull type class is also broken down by engine size.


 Current Nitro engine classes are:



Cubic Inch Displacement

Metric Class


0.000 Thru 0.129

0 - 2.115 cc


0.130 Thru 0.214

2.116 - 3.509 cc


0.215 Thru 0.458

3.51 - 7.509 cc


0.459 Thru 0.671

7.51 - 11.009 cc


0.672 Thru 2.136

11.01 - 35.00 cc

Formulas: CC X .061 = CID, CID divided by .061 = CC

Current Gas engine classes are:

Engine Class

Highly Mass Produced


Cubic Centimeter Displacement



15 - 25.99 cc


Open Classes



26 - 36 cc

15 - 25.99 cc

26 - 35.99 cc

2 Cylinder 53 cc max



CC x .061 = CID

CID divided by .061=CC


The most popular nitro engine brands are CMB, K&B, OPS, Picco, Rossi, OS Max and Novarossi. And in the gas engines Homelite, Zenoah and Quickdraw.  Prices for motors range from approximately $100.00 to $600.00. Racers typically use fuel ranging from 25% nitro to 60% nitro in their nitro engines.  The gas engines are NAMBA mandated to use ONLY gasoline and oil mix - no nitro,  (added) alcohol, etc.  The typical gas to oil mix is 8 oz oil per gallon of gasoline.

About the Radios

The boats are operated by Radio Control and typically employ 2 or 3 channels. Heavy-duty servos are used to control the rudder linkages while smaller servos are generally used for the throttle. Some modelers do use a third channel for control of a remote needle that allows the adjustment of the fuel flow to the carburetor while the boat is running. Boats operate in the surface frequency band and this range of frequencies is from 26.995 MHz to 27.225 MHz, 53.100 MHz to 53.900 MHz (Requires FCC Amateur Radio License) and 75.430 MHz to 75.990MHz. Futaba, Airtronics, JR, and Ace build the most common radios. Many drivers use a 2.4 Mhz Spread Spectrum type radio, as these are immune to interference.  New boaters probably should buy a Spread Spectrum radio right from the start.


About the Race Format

Races utilize a heat-racing format. Each heat consists of 6 laps for a total of 1 mile. The racers are given 2 minutes to start their engines and 30 seconds to mill. Mill time allows the racers to attempt to bring their boats to the start/finish line simultaneously as the race starts (the horn goes off). Races are held on a 1/6-mile oval course with 5 buoys outlining each corner and a start/finish buoy in the middle of the front straightway. Points are awarded for the order of finish and after five rounds of racing a win is declared to the racer with the most amount of points. Ties are broken by run off, or coin toss, as decided by the racers.

About the Cost

The class and the engine size determine the cost of building and racing a radio control model boat. In the Ready To Run class it is possible to get started for around $300.00 and can exceed $3000.00 for a multi-engine Outrigger Hydro or Unlimited Scale Hydro. Good used boats can be acquired through the boating forums "For Sale" sections, E-Bay, etc at reasonable cost.  When buying used boats, consult with an experienced modeler first.  Extra running hardware is required and includes such items as a starter, plugs, fuel and spare props.

Additional Information

It is wise to consult with  experienced modelers before getting into this hobby. They will guide you toward purchasing equipment  that will best fulfill your goals and expectations.   Feel free to contact WRCPBC through our club email at dwbebens@gmail.com

Enter supporting content here