Past Technical Notes

Sunnen Hone for Perfect Liner/Piston Fit
A Tech Note on the importance of a perfectly round piston and liner.

RC Hydro Turning Dynamics
A summary of a study in RC Model Boat Hydro Turning Dynamics

Squish Velocity as a Component of Head Design
A very helpful discussion of Squish Velocity (MSRV).

An Elegant Means for Regulating Water Flow
Brian Callahan shows a nifty way to restrict the water flow on a model boat to achieve maximum performance.

The Efficient Test Session – Part 1 of 3
How do you structure a testing session at the pond? Here is a detailed outline of a testing method that has worked very well over many years.

Multifilar Suspension Test Method
Brian Callahan describes how to measure the mass moment of inertia of a dynamometer inertia wheel, or any solid object.

Multiphase Flow on a Ventilated Marine Propeller and Rudder

Ever wonder why a wedge shaped prop or rudder works better for surface piercing applications than an airfoil section? Brian Callahan’s in-depth look at the fundamental physics behind our props and appendages explains why. Hard-core reading for hard-core boaters!

Efficient Use of a Mixture Control
How to use an onboard mixture control correctly and efficiently.

Fuel Mixing for Model Engines
A very helpful spreadsheet (Excel) for mixing fuel.

Selection of the Model Boat Propeller
Some helpful information about selecting model boat propellers.

Model Engine Bearing Installation
Easy installation of Model Engine Bearings.

Engine Analysis Program Measurement
Use of a height guage for precise measurement.

Hydro Digital Setup
Digital setup of hydro angles.

OS Mixture Control
Brian Callahan looks at the installation of the OS mixture control.

Recent Tid-Bits
Several findings from dyno testing and on-water testing.

How to Tune Your Water
The amount of water cooling to your engine – a very important factor!

Compression Ratios
Re-visiting Compression Ratio.

How Our Dyno Works
An “in depth” abstract on the workings of our Inertial Dyno by Brian Callahan.

Exhaust Timing
A current look at our opinion on Exhaust Timing and Port Configuration.

Pipe Length #4 of 4
How to accurately determine Tuned Pipe Length – Part 4 and Summary

Pipe Length #3 of 4
How to accurately determine Tuned Pipe Length – Part 3

Pipe Length #2 of 4
How to accurately determine Tuned Pipe Length – Part 2

Pipe Length #1 of 4
How to accurately determine Tuned Pipe Length – Part 1

Bits & Pieces
Bits and Pieces of information gathered from Dyno Testing.

After Run Lubrication of Model Engines
A must read for all modelers!

Drive Line Lubrication
This paper deals with the various drive line lubricants and methods.

Report on Building Our Inertial Dyno – Brian Callahan
This paper is a Graduate Level paper prepared by Brian Callahan for his Graduate work at the University of Michigan. Easy to read and provides a lot of useful information.

Inertial Dynamometer
This Tech Note discusses the recently completed Inertial Dynamometer.

Engine Blueprinting #5 (Final Assembly)
This Tech Note discusses the
clean up and final assembly of the engine.

Engine Blueprinting #4 (Rotor/Crank TIMING)
This Tech Note discusses the
timing of the Crank Induction or Rotor Assembly.

Engine Blueprinting #3 (Rotor/Crank FITTING)
This Tech Note discusses the
proper fitting and maintenance of the Rotor Assembly.

Engine Blueprinting #2 (The Exhaust Port
– Shape & Timing)
Tech Note discusses the shape of the exhaust port and some other important information.

Engine Blueprinting #2 (Engine Measurement and Fitting) This
Tech Note discusses to correct measurement methods, for the model
engine, to input the data into "The Engine Analysis Software".

Performance Tester – Lap Time Measurement
This is a scheme to measure
your on course performance using a small spreadsheet application
– free to download.

Prop Pitch Measurement – Hughey Pitch
This is a small spreadsheet
application to measure and document propellers using the Hughey
Pitch Guage.

Prop Sharpening – Boat Pulls Right
If you have had problems with your boat pulling right, this is
for you. This Tech Note discusses the cause and cure.

Combustion Chamber (Head) – Squish Velocity
This article deals with squish velocity in technical terms.

Combustion Chamber (Head) – Shapes
Several shapes of combustion chambers and their application.

Combustion Chamber (Head) – Squish Band
This will show you the correct squish band shape, percentage,
etc for our high nitro engines.

How important is hydrodynamic drag to your model? This will
answer that.

Course Management
This small Technical Article will show you ways to look at driving
styles and strategy, which will aid you in competition.

Roadrunner Setup
If you own a Roadrunner Hydro (The Finest Race Boat in the World),
this will show you how to set it up to perform perfectly.

Square Drive Installation
Part numbers and illustrated installation instructions for installing
the Square Drive System.

Tuned Pipes & How They Work
Do you need a simple explanation of how tuned pipes work – then
this is for you.

Prop Tech Notes
This is a sample of the information which you will get with the
purchase of a Prop Duplicator from MWD & Associates.

Engine Timing
What is the correct timing for your engine? This will help you

Engine – The Fit – Piston
Part #2 of The Fit covering the Piston.

Engine – The Fit – Liner
Part #1 of The Fit covering the Liner.

Engine – Compression Ratio
This is the first Tech Article and maybe the place where you
can make the most gain in performance. You MUST have The Engine
Analysis Software for this to be meaningful to you.

ENGINE Analysis Software for the Serious RC Competitor



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