Frequently Asked Questions.


Q- How fast is the Blue Ray?


A- We estimate the full throttle speed of a race legal Blue Ray to be around 40 mph with the indoor setup and 80 mph with the outdoor setup.  It will take about 2½ seconds to fly pylon to pylon on a 150' course with the indoor setup and a little over a second with the outdoor setup.  A ten lap race will take between 1 and 2 minutes flying time.


Q- Do I have to use the scoop?  <insert aerodynamic or thermodynamic argument here>


A- Yes.  It is part of the Blue Ray character.  Think of it as the under wing radiator on a P51.  You could omit it and you have seen models without it, but it does not look right.  A suggested rule  is that a minimum acceptable scoop must allow a US dime to fall through the opening under it's own weight.


Q- Why is there a minimum weight requirement?  I can make the Blue Ray much lighter.


A- The intention is to make this a fun pilots race.  There is no real advantage to expensive lightweight components or sophisticated building techniques.  The higher weight will also hold down the speed somewhat.


Q- My radio does not have exponential.  Do I need exponential on the Blue Ray?


A- It's very easy to "over-control" a small, fast plane like the Blue Ray.  Exponential reduces this tendency.  If your radio does not have exponential,  install the servos in the wing in the "stand up" position and attach the servo arms on the aileron and elevator servos 45º relative to the pushrod to give you mechanical differential (more "down" than "up" control on the ailerons and elevator).  Also reduce the maximum control surface throws by 25% to make the Blue Ray less susceptible to over-control.


Q- How big of a carbon fiber spar do I need for the wing?


A- You do not need any carbon fiber to build a Blue Ray.  Common filament reinforced strapping tape 2 to 3 inches wide applied to the top and bottom of the wing core make the wing plenty stiff.


Q- How can I tell my Blue Ray from the others?


A-  Decorate your Blue Ray with low temperature covering, colored packing tape or paint.


Q- How many Blue Rays are recommended per heat?


A- Four to Six.  A 150' race course is really not crowded with this number of planes.


Q- For class racing, will my "XYZ" brand motor work?


A- We recommend the following rule for class racing:  The motor cannot have a stator diameter larger than 22 mm and the KV rating cannot be more than 1820 KV.  If you have an unlabeled motor or a pilot challenges the legality of another pilots motor, the the following test will be made:  A known legal motor is run for thirty seconds and the rpm recorded.  The prop and battery are transferred to the Blue Ray in question and the rpm recorded.  If the rpm of challenged motor is greater than 105% of the known motor, it is ruled to be illegal.  The determination of the Contest Director is final.


Q- Should I sand the wire cut wing to smooth it out?


A- Your preference.  We recommend using the wing as is.  There is a re-melted skin from the cutting process that is destroyed if you sand the wing.  The remaining surface is then very soft and easily dented in handling.


Q- What's the best strategy for winning the race?


A- Consistent flying and tight turns wins races.  You don't need to have the fastest airplane or quickest launch to win.  The winners fly 10 consistent laps and turn within 10' feet of the pylons.  It's better to fly a little slower and maintain control around the race course than to fly fast, over-fly the pylons and make wide sweeping turns.


Q- Who do I contact if I have questions?


A- Contact Stan Sweet by email: or phone:  319-277-3584


Contact Us:


Phone:  319-266-2047