1/2-A Motor Operating Notes:
Our experience is that with proper handling, the Norvel and other small motors will perform very well. Most of the problems that we have seen
are a result of not reading the instructions and understanding that these motors have some specific requirements that you have to follow to get the
best performance.
To get the best performance from Norvel motors:
1...
Use the Big Mig version not the AME
.
The AME motors are designed for competition while the Big Mig is a sport motor. The Big Mig has
plenty of power and is much more user friendly and will idle much better than the AME version.
2...
Use the Freedom glow plug and head
.
Do not use the stock glow plug P/N-100138 . The stock plug is a very cold plug and and is not very
user friendly for the sport flyer. Do use the optional Freedom glow plug P/N-110138 and head. This plug will start very easily with the standard
battery and runs very well. At some time in the middle of 1998, Norvel will be switching over and start shipping all motors with the freedom glow
plug. If the parts list with your motor shows the part number for the glow plug as 110138 then your motor came from the factory with the Freedom
glow plug as standard equipment.
To get the best performance from all small motors:
3...
Break the motor in properly
. When using high nitro fuel, break in the motor with two gaskets under the glow head. For a proper break in
you need to start the motor, adjust the needle valve and throttle for a fairly high power setting (but still rich) and let it run for 2 to 3 minutes. Then
stop the motor and let it cool down. Repeat this procedure several times, leaning out the mixture a little more each time. With about 30 minutes
running time (10 three minute runs) you will be able to lean the motor for full power. It should start very easy, run very reliably and be ready to fly.
After the motor is broken in you may remove one of the gaskets from under the glow head for more power.
4...
Use 25% nitro fuel
. The high nitro content will produce a very smooth, consistent running motor. If you must use a lower nitro fuel do not go
below 15%. If you break in the motor following the above advice and the motor is not running properly then try switching to a different fuel. Don’t
cheat yourself by using a cheap fuel. Also, for motors that have a muffler like the Norvel, connect the muffler pressure to the vent on the tank. They
run better and produce a more consistent run using muffler pressure.
The fuels that we have used with good results are:
SIG Champion 25 K & B 1000 Norvel Fuel Byrons 1/2A Fuel Cox Super Power Cox Racing Fuel
Our best results have been with a fuel that has some or all castor oil in the mix.
There are other fuels available that will work just as well as the ones listed above. These are just the ones we have tried.
Herr Engineering Corp. Kit #502 Aqua-Star Correction Sheet, Revision #5
#1...Be sure to mount the engine far enough forward on the mount so the rear of the muffler does not interfere with the firewall.
#2...Several of the rudder / fin parts are numbered wrong on the sheet layouts on page 4 of the instruction book, but you should have no difficulty
identifying them by laying them on the plan.
#3...After the model is covered do not remove all of the covering from the rear pushrod exits. This can allow excess water to enter the fuselage. Just
make a single slit with your knife down the center of the exit and allow the covering material to form a semi-seal around the pushrod. Adding thin
foam tape to the wing saddle area will help prevent water from entering the model in this area. If your model gets much water inside, remove the
wing and allow the wood to dry before flying. Water in the back end of the model can cause the balance point to move too far back.
#4...If the nose of your model “plows under” during takeoff, try removing some or all of the down thrust by adding washers between the firewall and
the bottom of the motor mount. This should not be a problem if you stay with the recommended engine sizes. Putting a bigger or more powerful
engine than a .061 Glow engine will produce disappointing results. Most .10 engines only put out about 20% more power than the Norvel .061 but
weigh almost 3 times as much. You will actually lose performance with a .10 engine, and the additional weight that high on the model will cause
handling problems on the water.
#5...The “Z” Bend pushrods have now been replaced with 18” rods with small clevises.
#6...The 3/4” triangle wing tip blocks are shorter than the last wing rib. Glue them flush with the leading edge and taper the trailing edge forward to
be flush with the aft end of the block. This taper is shown on the wing plan but is not described in the instruction book.
#7...The proper technique to initiate water take offs is: Point the model directly into the wind. With the engine at idle, hold full up elevator. Slowly
advance the throttle ( 5 seconds from idle to full throttle ). As speed builds up the model will come up on the step. Then relax the pressure on the
elevator stick slowly to neutral or just slightly up. Once take off speed has been achieved, apply a small amount of up elevator to climb out.
Summary of Contents for AQUA STAR HRR502
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