Equipment needed to finish your Bug
You will need the following gear to complete your BUG.
This picture is our most current, AFFORDABLE, and available recommendation for powering the "BUG". IT WORKS! All available from us NOW from the home page at very reasonable prices. It consists of our custom wound CD Rom 1100kv brushless motor with prop saver $30, a 10 amp, 13 amp burst auto cell count brushless speed controller $22, 3 -tower pro 5 gram servos $9 each, and a 2 cell $17, and 3 cell $23 15C-25C burst rated lightweight Li-po batteries with balance tap. Also shown is a tube of "UHU Creativ glue for foam, we love it, dries fast, clear, and flexible, with an excellent bond to EPP foam, carbon fiber, and plastic!! Available from us for $4, Also shown is our "Magic Motor Mount" $5.99, also available are additional rolls of Blenderm Hinge Tape 1" x 5 yds (included with the BUG kit) , $3
Here are the specs on our 1100kv Custom Wound CD brushless motor shown below with our "Magic Motor Mount": (does not compare with the 1300kv model available elsewhere, it is NOT the same motor!)
A LIGHTWEIGHT POWERHOUSE! The motor weighs under one ounce and yet it is capable of producing up to 18 ounces of thrust (with 3 cells)! The motor alone weighs just 25 grams or 0.9 ounce. It is supplied with a prop adapter and o-ring.
Recommended props for 2 cell Lipo batteries (7.4 volt):
The GWS EP1060 (best choice here) produces about 12 ounces of thrust at 6.5 amps with a pitch speed of 28 mph.
The APC 9x6E produces about 11 ounces of thrust at 6 amps with a pitch speed of 29 mph.
The APC 10x3.8SF produces about 12 ounces of thrust at 6.5 amps with a pitch speed of 17 mph.
Recommended props for 3 cell Lipo batteries (11.1 volt):
The GWS EP 9050 produces about 18 ounces of thrust at 9 amps with a pitch speed of 34 mph. This prop is a tight fit on the included prop adapter - the hub may need to be filed down a little. APC props fit perfectly.
The APC 9x6E produces about 17 ounces of thrust at 10 amps with a pitch speed of 36 mph.
The APC 9x3.8SF produces about 18 ounces of thrust at 9.5 amps with a pitch speed of 25 mph.
Again, the GWS EP1060 works great and produces about 18 ounces of thrust at 8.5 amps, sweet...:)
Weight (motor only) = 0.9 ounces (25 grams)
Diameter = 1.1 inch (28mm)
Total Length = 1.7 inch (43mm)
Shaft Length = 0.4 inch (10mm)
Shaft Diameter = 3mm
Voltage = 7.2 to 12.6 kv = 1100kv
Current = 10 amp max.
Our $22 10 amp (13 amp burst) speed control works great with this motor!
Tower Pro SERVO SG50 Specs: $9
Dimensions = 0.83 x 0.45 x 0.9 inch (21.0 x 11.5 x 23 mm)
Weight (servo only) = 0.18 ounce (5 grams)
Weight with wire and connecter = 0.23 ounce (6.6 grams)
Stall Torque at 4.8 volts = 10.2 oz/in (.7 kg/cm)
Operating Voltage = 3.0 to 6.0 volts
Operating Speed at 4.8 volts (no load) = 0.10 sec/ 60 degrees
Connector Wire Length = 5.9 inches (150 mm)
Universal connector fits most receivers
Transmitters -- Any inexpensive 4 channel transmitter with elevon mixing will work. You can also buy an external mixer, but it just adds more weight. Some advanced features are extremely useful such as exponential, or dual rates, A programmable transmitter is worth the extra money. Don't overlook the new Spektrum 2.4ghz!
Receivers -- Should be as light as possible. The very inexpensive 4.6 gram GW/R-4P (Made by GWS) works well but some people have problems with glitches at crowded indoor flying sites. A Berg 4 channel, (made by Castle Creations) is a good compromise of low weight and good performance. Bluebird and Plantraco make good small receivers as well. Our Corona DSP auto shift single conversion receiver is a great choice here. Look for a weight of 4 to 6 grams. All dual conversion receivers are too heavy. Again the Spektrum is also a great consideration.
Now also available from the home page is the Corona RS410 Full Range DSP Receiver
AUTO SHIFT! Good for Futaba or JR.
Size: 1.1 x 0.6 x 0.3 in. / 28 x 15 x 7.6 mm
Weight w/o Antenna: 0.17 oz / 4.7 grams (with shrink wrap)
Weight with Antenna: 0.19 oz / 5.3 grams
Sensitivity: better than 2.0µV
Selectivity: ±8kHz at 65dB down
Number of Channels: 4
Filtering: Dual tuned RF circuitry
Filtering: Dual 4 pole ceramic filter
Filtering: DSP filtering with mild algorithm
Shift Polarity: Auto-Detect (positive or negative)
Case: Shrink wrap
Operating Voltage: 4.8V~6.0VDC
Operating Current: 11mA
Servos -- Always best here is small and light, but there is a limit here. The Bug has extremely large elevons and needs a servo with decent torque. This airframe can survive massive shocks when crashing and the servos can really take a beating. We suggest spending the extra $3.00 for a spare set of servo gears. Look for a 5 to 7.5 gram servo with at least 10 oz in of torque. These are some that we know work well. Hitec HS-55, GWS Pico, Eflite S75's, Eflite S60's, and our $8 Tower Pro 5 gram servos. These are all reasonably light, inexpensive, and widely available. The GWS Naro and more powerful Naro+ HP-BB. have stronger gears but weigh a bit more.. A Hitec HS-50 is a bit small, low on torque and prone to gear stripping. There are several other sub 6 gram servos that may be too fragile for use on the elevons. The rudder doesn't need much torque and can use even the lightest servos on the market.
Speed Controls -- Make sure your power system is matched, This means the right prop selection to effectively use the motor and battery without overloading them, and a speed control that can handle the amperage used. For small brushless motors there are only a few available now but others are coming. Just fine is the Phoenix 10 amp or the Thunderbird 9 from Castle Creations. These are small, light, and can easily handle the 5 amps or so that we need. The inexpensive BP10, a well known and inexpensive 10 amp (13 amp burst) brushless controller works perfect with our new 26 gram brushless CD Rom style 1100kv motor, and BOTH are available directly from us at very reasonable pricing. E-Flite has a new 10 amp also, and there are many others being introduced regularly.
The expected weight of this airplane will be just about 6 ounces with a power system (motor, prop, battery, speed control) weight of 2 ounces or less. The new generation of CD Rom motors and IPS sized brushless motors are a perfect fit and motor mounts are included for both. A standard IPS motor will also fly this plane well and makes a good inexpensive trainer.
The obvious first choice with the most versatile flight envelope should be a good CD Rom based motor. We have one available that we think is fantastic! They are quiet, simple, and can spin a prop directly without a fragile gearbox. However,.. not all of them available are good for this application. Ideally you want one that is designed to spin a large prop for maximum static thrust. There is clearance for an 11 inch prop but 10 inches is ideal. Many CD motors are wound too hot and need smaller 7-8 inch props to keep the amp draw down especially if used with three lithium cells. Our little gem can spin a 10x6 prop on only 2 cells producing around 12 ounces of thrust with about a 6 amp draw. You can buy them directly from us...
There are hundreds of motors available and it can be hard to choose an appropriate one. As a general rule, look for a motor that weighs less than 1 oz. and can swing a large 10 or 11 inch propeller, preferably on 2 cells such the easy to find E-Flite 300, and the smallest Axi's, amongst others. A motor running on three cells will require a smaller prop, and will lose much of its extra power due to less efficient (smaller) prop size and extra battery weight. The net result is more thrust, but a heavier plane and more expensive battery. To summarize, a well matched 2 cell motor combo such as the one just mentioned will keep the weight as low as possible. There are however, many more 3 cell combos to choose from that produce excellent power with around ½ oz. extra battery weight.
Whatever power system you choose, It is HIGHLY recommended that you use a PROP SAVER and o-ring. Not merely to protect the prop, they are inexpensive, but more importantly to protect against potential shocks to the fuse and the motor attachment point In case the prop hits the ground. This will allow the prop to fold back and be very forgiving, further adding to the "BUG"s other built in durability features and benefits...
This plane has been tested at flying weights up to 7.5 ounces with larger E-Flite/Razor/Himax sized outrunner motors and batteries. The airframe handled the stresses fine but the flying qualities changed dramatically from the extra weight. Be warned, this plane is "PURE MAGIC" at around 6 oz. (or under!) and by comparison, a flying brick at 7.5 oz. despite the additional power. It doesn't fly bad when heavy, it just flies like every other plane. Keep it just around 6 oz. for spectacular results.