Post by David C on Oct 19, 2009 7:34:14 GMT -7
The following is an article by Dave Jr. in the SCI web site that might help you Fly DP car perform better 
The Fly Riley is a well made car using very basic slot car construction.
The car weighs 82 grams, 51 rear, and 31 front. Total weight 450 grams on the Magnet Marshal.
I totally disassembled the car and inspected all the parts. The wheels are a new idea to me, making a recess where the sprue attaches to the outside of the rim. (photo #1)
The motor is removed, mounted on a piece of foam, and run at half speed while I am preparing the front wheels.
I spin the front wheels on the sanding drum in the Dremel at 5000 RPM and hold a mill file across both wheels. This will remove the remaining sprue tips and flatten the parting line on the wheels. (photo #2)
The tires are installed and they are spun with the Dremel. A piece of 220 grit sandpaper, glued to a piece of flat plastic, is held against both tires to remove the parting line and high spots. (photo #3)
The chassis is mounted on my tire fixture and the rear wheels are trued up in the same manner as the front wheels. The tires are installed and sanded in the tire fixture with very light pressure on the 220 grit paper. (photos #4&5)
The car is then assembled and run on the tire sanding skid pad. Two minutes in each direction on the 220 grit side, then five minutes in each direction on the 800 grit side. (photo #6)
The pickup braids were flared out to make them more flexible. They are then bent flat against the bottom of the guide and given a slight arc so they are below the edge of the flag.
The only problem I found with this car is the crown gear isn’t centered and the left rear wheel rubs the body. I removed some material from the inside top of the wheel openings, and also added a 0.020” shim to the rear body mount.
I ran the car 100 laps before testing the motor. The best chassis setup I found was both front screws snug, and the rear screw ½ turn loose.
The motor has high torque, low RPM, and needs a lot higher gear ratio on my track for best performance.
I added Slot it chassis magnets to the outside of the Fly motor to change it’s performance characteristics.
These are the motor specs and lap times for the three different motor configurations. The motor had 0° advance.
Stock
294 g/cm, 18575 max RPM, 13.7 Watts, 5.94 Amps at stall.
Average lap time 7.40 seconds, 17.1 feet/second or 11.7 MPH top speed.
Two external magnets
264 g/cm, 21063 max RPM, 13.9 Watts, 6.15 Amps at stall.
Average lap time 7.25 seconds, 18.8 feet/second or 12.8 MPH top speed.
Four external magnets
252 g/cm, 22291 max RPM, 14.0 Watts, 6.39 Amps at stall.
Average lap time 7.15 seconds, 19.3 feet/second or 13.2 MPH top speed.
The cornering speeds could be slightly improved if left rear tire ran perfectly true, the car had a slight vibration making right turns. The stock tires provided good grip on my semi-gloss latex MDF track.
The car ran extremely smooth and quiet with the front body mounting screws snug, if the body was loose it would rattle.
With the motor in it’s stock configuration the brakes were severe, with the added magnets the braking was lighter and made the car a little easier to drive.
I ran about 100 laps for each of the three motor configurations. The car, without the added magnets to the motor, could probably use a 2.40:1 or 2.50:1 gear ratio for my track.
Removing 10 grams of total weight for better cornering, the Fly Riley would give any Slot it car all it could handle.
The best lap times for the Riley are about one to two tenths slower and about one foot/second slower than a stock Slot it 956 with a V12/2 motor.
(Of course adding magnets to the motor would not be allowed in certain race series but very intersting none- the- less
Dave C.)
The Fly Riley is a well made car using very basic slot car construction.
The car weighs 82 grams, 51 rear, and 31 front. Total weight 450 grams on the Magnet Marshal.
I totally disassembled the car and inspected all the parts. The wheels are a new idea to me, making a recess where the sprue attaches to the outside of the rim. (photo #1)
The motor is removed, mounted on a piece of foam, and run at half speed while I am preparing the front wheels.
I spin the front wheels on the sanding drum in the Dremel at 5000 RPM and hold a mill file across both wheels. This will remove the remaining sprue tips and flatten the parting line on the wheels. (photo #2)
The tires are installed and they are spun with the Dremel. A piece of 220 grit sandpaper, glued to a piece of flat plastic, is held against both tires to remove the parting line and high spots. (photo #3)
The chassis is mounted on my tire fixture and the rear wheels are trued up in the same manner as the front wheels. The tires are installed and sanded in the tire fixture with very light pressure on the 220 grit paper. (photos #4&5)
The car is then assembled and run on the tire sanding skid pad. Two minutes in each direction on the 220 grit side, then five minutes in each direction on the 800 grit side. (photo #6)
The pickup braids were flared out to make them more flexible. They are then bent flat against the bottom of the guide and given a slight arc so they are below the edge of the flag.
The only problem I found with this car is the crown gear isn’t centered and the left rear wheel rubs the body. I removed some material from the inside top of the wheel openings, and also added a 0.020” shim to the rear body mount.
I ran the car 100 laps before testing the motor. The best chassis setup I found was both front screws snug, and the rear screw ½ turn loose.
The motor has high torque, low RPM, and needs a lot higher gear ratio on my track for best performance.
I added Slot it chassis magnets to the outside of the Fly motor to change it’s performance characteristics.
These are the motor specs and lap times for the three different motor configurations. The motor had 0° advance.
Stock
294 g/cm, 18575 max RPM, 13.7 Watts, 5.94 Amps at stall.
Average lap time 7.40 seconds, 17.1 feet/second or 11.7 MPH top speed.
Two external magnets
264 g/cm, 21063 max RPM, 13.9 Watts, 6.15 Amps at stall.
Average lap time 7.25 seconds, 18.8 feet/second or 12.8 MPH top speed.
Four external magnets
252 g/cm, 22291 max RPM, 14.0 Watts, 6.39 Amps at stall.
Average lap time 7.15 seconds, 19.3 feet/second or 13.2 MPH top speed.
The cornering speeds could be slightly improved if left rear tire ran perfectly true, the car had a slight vibration making right turns. The stock tires provided good grip on my semi-gloss latex MDF track.
The car ran extremely smooth and quiet with the front body mounting screws snug, if the body was loose it would rattle.
With the motor in it’s stock configuration the brakes were severe, with the added magnets the braking was lighter and made the car a little easier to drive.
I ran about 100 laps for each of the three motor configurations. The car, without the added magnets to the motor, could probably use a 2.40:1 or 2.50:1 gear ratio for my track.
Removing 10 grams of total weight for better cornering, the Fly Riley would give any Slot it car all it could handle.
The best lap times for the Riley are about one to two tenths slower and about one foot/second slower than a stock Slot it 956 with a V12/2 motor.
(Of course adding magnets to the motor would not be allowed in certain race series but very intersting none- the- less
Dave C.)