New design 2007 QHP cooper pipes information page
Cooper pipes has released a totally new line of muffled tuned pipes for 2007 designated QHP with following sizes available.
1. .21 (3.5 cc) nitro engines
2. .45 (7.5 cc) nitro engines
3. .67-1.00 (10-17cc) nitro engines
4. Gas pipe (Gasoline engines)

The quest to develop a new pipe was based on the following goals.
1. A new pipe design that would offer more performance than current pipes available in the following areas.

A. Low end torque.
This is an area I believe everyone wished they had more low end torque either at the launch from the pits, during the pre race such as slowing down for the start of the race, the ability to use a larger prop,
and the ability to shorten the pipe to obtain higher RPM's.

B. Mid range "Torque" transition.
The mid range transition is the most important part of a pipe design once the boat is up and running. It is this transition area that allows us to "drive" the boat from the around the middle throttle position in to the higher RPM levels. The lack of a good middle transition design presents problems of "not being able to back off on the throttle for fear that the boat will not get back up to the higher RPM's when you increase the throttle, or the boat slows down and will not get back to the RPM's because of the dreaded excessive heat wave propagation in the pipe.

C. High RPM's
This is an area that most racers I believe would agree is where the speed factor lives. Although high RPM is related to many factors, type of boat, weight, setup, prop, engine seal and engine efficiency, both A & B from above, and many other factors to numerous mention.
After many hours of testing I am confident the new QHP pipes will allow higher RPM's in your current setup .

D. Quiet pipe
This area was a prime concern in the development of the QHP line of pipes. We did a lot of testing on different ponds in different types of boat using different noise canceling technology to obtain the lowest noise levels, which we are using in current production pipes. The use of dual offset exhaust stingers tubes in the muffler can does several things.

The first being it reduces the initial shock wave front from (1) a large wave front (one large diameter outlet hole), into (2) smaller offset wave fronts using (2) smaller diameter tubes. The use of dual outlet tubes
also has a form of noise canceling which brings a very unique, almost twin sound during operation.

E. Design factors
I started to develop a pipe design program about thirty months ago using many formulas based on various data related to 2 cycle engines.
This program allows me to analyze the wave return efficiency of each area of the pipe for optimum performance of energy wave return.
I also used a technology called "NLF, while drawing the pipe in
BobCad to make the arbors, which also promotes more energy wave return efficiency.
In terms of pipe mounting applications, the .21,.45, and .67-1.00 pipes have a (9) degree down angle to bring the rear section of the pipe lower when mounting the pipes in both mono's and hydro's.

F. Pipe Material
The material used in the manufacture of cooper pipes is a very special high quality non-standard seamless aluminum tubing that during the manufacturing goes thru a unique 30-day process that brings the burst strength up to over 1500 psi. This special aluminum also gets much harder during the manufacturing process greatly increasing strength of the aluminum tubing, and a hardening of the surface which resists those ugly dents and dings, and we have a very strong, hard, pipe that is very light.

G Testing
Here is where we look at the overall performance of a pipe to verify how "good" or "bad" a pipe performs in relation to other current pipes in the market.'
Because the majority of boaters today, for various reasons, use stock engine to race with, this is the area that we spent most of our test time using different boats including Mono's .21 thru 1.00 inch, Hydro's .21 thru 1.00, Sport.21, sport 45, and scale using stock, unmodified engines, verifying there performance with the current pipe, and then simply removing there current pipe and installing the new QHP pipe and verifying the new data.
We also tested boats using various modified engine, (only the engine owner or the person who modified the engine knew what was done), using the same testing procedures of running with the current pipe, verifying the performance data and then installing the QHP pipe and verifying the new data.

H. Pipe specifications

Name weight oz. OAL in.
.21 QHP 3.2 oz 11.0
.45 QHP 5.4 oz 12 1/2
.67-1.00 QHP 6.4 oz 14 1/2
Gas QHP 7.3 oz 16 1/2

I hope this information has been helpful in answering some questions in regards to the new QHP line of tuned quiet pipes. If you have any questions please feel free to email me at the address below.
Thank you

World Wide distributor
Cooper pipes
Dick Jones
Phone 563-264-2972
Fax 563-288-4198
email cooperpipes@hotmail.com
web site www.cooperpipes.com