The Sig Kadet LT-40 has become the R/C trainer of choice at many club fields. Not long after it's introduction, we started getting requests for a smaller version of the same airplane. So here it is - a compact version of the LT-40 - the new Sig Kadet LT-25. When price shopping this kit, be sure you understand our super low flat rate shipping means total cost to your door is probably the lowest on the planet.
"The R/C Trainer That's All Laser Cut", As you would expect, the new LT-25 inherits all the same gentle flying characteristics of the other legendary Sig Kadets. It has the same light wing loading, which allows it to fly slow enough to give the student pilot time to think and react. It has the same "hands off" stability on all axis. If the student pilot gets disorientated, simply let go of the sticks and the LT-25 will recover and return to level flight within seconds.
Specifications:
Wingspan 63 in 1600 mm Wing Area 724 sq in / 46.71 sq dm Weight 4 - 4 1/4 lb 1814 - 1928g Wing Loading 12 - 13 oz/sq.ft. 3662 - 3967 g/sq-m Radio Required 4-Channel Recommended Engines .25 - .32 cubic in (4.1 - 5.2 cubic cm) 2-Stroke .20 - .26 cubic in (3.3 - 4.3 cubic cm) 4-stroke
Special notes about electric from Dave: This model makes an excellent electric conversion and is perhaps the most popular one of all time. Super light weight, large as or even larger than most 40 size trainers. The only lighter weight 40 size trainer on the market is the Radical RC Intern 66.
Setup and Performance Chart
Motor
# Cells
Prop
Amps
Watts In
RPM
Thrust oz.
Pitch Speed MPH
Climb FPM
Est. Top Speed
Himax 3516-840
3
11x8
26.2
295
7,500
57
41
970
46
Himax 3516-1130
3
10x7
36.6
412
9,920
66
50
1294
51
Himax 3522-990
3
11x7
37
416
8,770
58
54
1405
51
Himax 3522-990
4
10x5
35.7
536
12,310
58
64
1683
54
Himax 3528-1000
3
12x6
44.5
501
8,690
49
64
1698
52
Himax 3528-800
5
10x5
31.4
589
12,900
61
71
1865
57
Himax 3528-1000
4
11x5.5
51.4
771
11,660
61
85
2453
60
Himax 5018-530
5
12x8
30.5
572
8,560
65
76
2050
59
Himax 5018-530
5
13x8
38.5
716
8,210
62
93
2614
62
Estimates based on manufacturers provided constants using E-Calc. High Quality 2100-3000mah used as trial cell in calculations. Presumed model weight of 76oz. @3 cells (added oz for higher cell counts). Actual performance may vary depending on components used, accuracy of data as provided by manufacturer, quality of battery, ESC, and many other factors.
TEMPROARILY OUT OF STOCK, MANUFACTURER BACK ORDER, NO ETA AT THIS TIME SORRY
This FDK (formerly Sanyo) AA 1650 Multiplex pack is the only way to go when replacing your weak factory pack. 7.2 volts and 6 cells just more bang. Comes without plug, reuse your old plug, direct solder or select optional Multiplex transmitter connector below. No thermal fuse in these packs.
Maintenance charge and maximum form charge rate for this pack is not to exceed 100mah. See chart at top of category page for charging recommendations.
Form charge on factory wall charger only, not to exceed 100mah. Attempting to form charge (initial charge) on peak detection charger or by any other method not specifically stated here is not recommended and voids warranty.
Maxx Products Light Weight Motor Mount, small size. Fits most outrunners smaller than 28mm like Himax 22 series and etc. Fits most 20mm inrunners. Injection molded part. Stands motor out 2.65" (67.3mm). SKU Number: MPIACC3952
A123/LithiumWerks' High Performance Nanophospate lithium iron phosphate (LiFePO4) battery technology delivers high power and energy density combined with excellent performance and extensive life cycling in a lighter weight, more compact package. A123LithiumWerks' cells have a low capacity loss and impedance growth over time as well as high usable energy over a wide state of charge (SOC) range, allowing out them to meet requirements of many applications.
These batteries are capable of 50 amp constant discharge, with a 10 second pulse rating of 120 amps. Cycle up to 1000 times before significant capacity loss occurs. The rugged assembly of the products will ensure that your pack will last for years, not months. Can be repeatably charged to 100% in 15 minutes. Charge only with Lithium chargers with an A123 (LIFE) mode limiting charge voltage to 3.6V per cell.
Specifications, March 2021:
Nominal Ratings Voltage 3.3 V Capacity @ 25 °C 2.56 Ah +/- 0.1 Ah Energy @ 25 °C 8.25 Wh Specific Power @ 25 °C, 2 sec pulse > 4000 W/kg Impedance (1KHz AC) Typical 6 mΩ Cycle Life at 1C/1C, 100% DOD > 4000 cycles
Discharging Max Continuous Discharge Current 50 A (20C rate) Max Pulse Discharge Current (10s) 120 A (48C rate) Minimum Voltage / HPPC Pulse 2 V / 1.6 V Temperature -30 °C to 60 °C
Charging: Charge only with Lithium chargers with an A123 (LIFE) mode limiting charge voltage to 3.6V per cell:
Cell charging parameters: CC-CV (constant current - constant voltage) Recommended Charge Current 3 A (1.2C rate) Max Continuous Charge Current 10 A (4C rate) Max Pulse Charge Current (10s) 20 A (8C rate) Float Voltage 3.45 V Recommended charge V & Cut-off Current 3.6 V, taper to 125mA
Temperature Range (reduce charging current to 250mA when under 0 °C) -20 °C to 60 °C
Storage Storage Temperature -40 °C to 70 °C
Mechanical Diameter Ø25.96 +/- 0.5 mm Length 65.15 +/- 0.5 mm Mass 76 g +/- 1.0 g
Tech Notes: 10A Recommended float charge and storage voltage: 3.8V Recommended cut-off current for CV hold: 0.05A Maximum continuous charge current: 10A Maximum allowable charge voltage: 4.2V MAX Fast charge time: 15 minutes Cell discharging parameters: Recommended discharge cut-off voltage: 2.0V Maximum continuous discharge current: 50A Cell temperature parameters (skin temperature) Maximum recommended cell temperature: (158F) Maximum allowable cell temperature: (185F)
3x2 Double Stick, 7.2V FDK (formerly Sanyo) 6-AA 2500 NIMH cells. "Twicell" (formerly Eneloop) low self discharge type which comes partially charged and is the same product as prior. Made to fit Hitec's new Aurora 9 and the Airtronics SD-10G. Excellent way to go when replacing a weak factory pack. 7.2 volts and 6 cells just more capacity. Comes without plug, choose below or reuse your old plug.
Same size as 700 and 1100 NiCad pack above. Less weight than 1400 NiCads above. Good cell where fast charging is not a needed but extra capacity is desirable. High capacity TX Battery, if you are sick of your TX running down. Yes, it is the same size as your current AA pack. A "AA" is a "AA". This is what your computer TX should have included!
7.2V Weight 234g / 8.25 oz.
Individual Cell Internal Impedance 20.0mΩ
All AA size cells over 1700mAh should not be fast charged ever! If you repeat this experiment, your on your own. I recommend only factory wall wart charging with units rated of 70mAh or less for these type cells. Break in (first forming charge) on 50mAh factory wall charger 700mAh-19.6 hours,1100-30.8 hours,1650-46.2 hours, 2500-70 hours. For 70mAh wall charger deduct 28% of time, for 100mAh wall charger deduct 50% of time. Forming charge (initial charge) on peak detection chargers is not recommended and voids warranty. Any peak or fast charger use on this pack voids warranty. Don't bother calling trying to get a warranty for failing to follow instructions. I've heard all the stories. They all end like this, "My battery does not cycle well now." and "It worked ok for a while but now it runs down fast shortly after charging". If you put any AA cell over 1700mAh capacity on your peak charger, it's bad. I've already made theses tests for you so you could avoid the pain. If you ruin one of these mega capacity TX packs, just order a new one and do better the second time.
Second from left motor in photo is the 3516 series.
Himax 3516 series motors are most generally used in 34-70 oz models depending on application. Replaces AXI 28 series motors. Manufactured to high standards for the discerning modeler. Package includes collet type prop adapter, prop saver, bullet females for your ESC and fasteners.
Specifications:
Weight
Size D x L
Amps
Shaft
Max Motor RPM
KV
Resistance
No Load Current
134g/4.7oz.
35.2mm(1.39") x 42.2mm(1.66")
10-34, 48 15s
5.0mm (.1969")
20k
1130
.030Rm
1.8A
Setup and Performance Chart
# Cells
Prop
Amps
Watts In
RPM
Thrust oz.
Pitch Speed MPH
2
10x10
26
195
7,710
29
62
2
12x10
39.4
296
5,800
42
54
3
9x7
28.9
325
10,510
46
68
3
9x9
34.2
385
10,100
45
84
3
10x5
30.3
341
10,400
53
47
3
10x7
37.9
426
9,820
58
63
3
11x5.5
41
461
9,590
66
48
3
11x7
47.2
531
9,110
70
59
4
8x6
29.2
438
14,480
54
80
4
9x4.5
32.9
494
14,160
65
58
4
Xoar 10x4
40
602
13,550
76
49
5
8x4
30.6
574
18,330
69
66
5
8x6
41.1
771
17,360
79
95
6
7x6
37.5
844
21,610
75
119
Estimates based on manufacturers provided constants using E-Calc. High Quality 2200mah used as trial cell in calculations. Actual performance may vary depending on components used, accuracy of data as provided by manufacturer, quality of ESC, weather and many other variables. SKU Number: MPIHC35161130
HS-65HB/MG / 5065MG / 70MG / 5070MH - Horn & Hardware Set Micro 25T. This is the replacement HS-65HB/MG servo horn set from Hitec. This set contains one star shaped horn (24mm), one short (25.4mm), and one long (35mm) servo arm. Set also includes mounting screw to mount servo horn to servo and lock washers.
Harrier Supreme V2 ESC's are made for a wide variety of applications. Comes with extensive manual for programming all settings. Well documented. Programming card compatible available seperately.
A123 Systems/LithiumWerks #18650 3.2 V 1.8 Ah 1800mAh Lithium Iron Phosphate (LiFePO4) Battery Single Cell.
[edits pending.....These batteries are capable of 30C constant discharge, with a 10 second pulse rating of 60C. Cycle up to 1000 times before significant capacity loss occurs. The rugged assembly of the products will ensure that your pack will last for years, not months. Can be repeatably charged to 100% in 15 minutes. This is the nano phosphate technology the automobile companies are testing on their future hybrid vehicles. Charge only with Lithium chargers with an A123/LithiumWerks mode limiting charge voltage to 3.6V per cell. ]
Specifications:
Manufacturers Part Number: 320749-001
Nominal Ratings:
Voltage 3.2 V
Capacity @ C/5 Typical (Min) 1.8 Ah (1.7)
Energy 5.76 Wh
Specific Energy 133 Wh/kg
Energy Density 330 Wh/L
Impedance (1kHz ACIR) < 20 mΩ
Cycle Life at 0.5C/0.5C, 100% DOD > 4000 cycles
Discharging:
Max Continuous Discharge Current 5.4 A (3C)
Max Pulse Discharge Current, 10s 18 A (10C)
Minimum Voltage 2.0 V
Temperature -20°C to 60ºC
Charging:
Recommended Charge Voltage 3.6 V
Recommended Charge Current <= 0.9 A (C/2)
Max Continuous Current,>10ºC2.7 A (1.5C)
Terminate Charge @ 3.6 V < 36 mA
Float Voltage 3.5 V
Temperature 0ºC to 60ºC
Storage:
Temperature -30 oC to 70 oC
Mechanical:
Diameter O18.5 +/- 0.1 mm
Length 64.95 +/- 0.2 mm
Mass 43.4 g +/- 1.0 g
Certifications:
Transportation shipped @ <= 30% SOC UN 3480, UN 38.3
Heavy Duty 14.5 gauge (1.810mm^2) 360 strand wire. Insulation diameter 3.2mm. Great for power supply extensions, charge cords and other high amperage applications suiting a high strand count quality vinyl jacketed wire. Select desired length below, cut in bulk.
Notes: 15 guage is 1.65mm^2, 14 guage is 2.08mm^2. Thus, this wire @ 1.81mm^2 is approximately 14.5ga.
Brushless 64mm brushless ducted fan. 4600KV motor with EP2540x6 blade rotor. Use optional heat sink GWACS019 for running over 11.1v input.
GWS Performance Chart
Volts
Amps
Thrust G/OZ
Watts Power
Efficiency Grams/Ounces Per Watt
7.4
9.5
212/7.48
70.30
3.02/106.36
11.1
17.2
410/14.46
190.92
2.15/75.74
12
25.1
651/22.96
301.2
2.61/76.23
* At 12V power is boosted but fatal damage can occur from overheating, great care must be taken. Heat sink GWACS019 should be used. SKU Number: GWEDF064D
5S K6 Series 3300. 65C (195 amps) Constant; 130C (390 amps) Burst. High discharge cells. Industry Standard XH balance plug. Weight: 435 grams. Measures: 139 x 45 x 34mm.
ULTRA-HIGH POWER LITHIUM-ION CELL, 2800mAh, Multi-Cell Pack
INR18650-P28A
Molicel has dedicated our product development in the path of ultra-high power cells with focus.
[EDITS PENDING: The launch of a new generation 18650 power cell, INR-18650-P28A, featuring 7% higher capacity however 22% lower DCR compared to P42A. Its consistent 45A discharging performance has now enhanced hugely with superior fast charge capability up to 3C charging rate.]
This is a starting point of low impedance version that shall be ideal for premium segment in EV, eVTOL, micro-mobility, home appliances and more applications.
Single Cell is in last photo.
Molicel Battery - Ultra-high Power Cell INR18650-P28A
Charge Current: Recommended: 2.8 A (1C); Maximum: 6.0 A (3C)
Discharge Current: Continuous (MAX): 35 A
Dimensions: Diameter: 18.6mm X Length: 65.2mm
Weight: 46g
Power Output: 184W (10s, SOC 90%); 168W (10s, SOC 50%)
Energy Density: 610 Wh/l; 240 Wh/kg
ABOUT ADVANCED R&D PRODUCTS & APPLICATIONS bolt Up to 120W Higher retention for discharge energy up to 120W continuously loop 500+ Cycles High rate 80% retention electrical_services Fast Charge 13.5A continues charge south_west Lowest DCIR Max internal resistance 13.8 mOhm trending_down Low Impedance Growth Over long cycle thermostat Thermal Controlling In cell thermal distribution optimized (3-4 ?C)
Choose your custom pack from the options below, if there's a plug and wire combination not listed, type in your request in the box provide below the options. Photos depict wire configuration options, want something different, type in your request in the box provided below the options.
Please indicate # Cells x # Cells and other notes in the "Battery Pack Shape Notes" box below, then in the Comments section at checkout tell us you're sending us a drawing, diagram, or photo.
Some helpful shape descriptions:
Square: # Cells High x # Cells High, Even # Cells, looks like two cells on top of two cells from end view.
Block: # Cells Flat Wide x # Cells Flat High
Block Offset/Nested: # Cells Flat Wide x # Cells Flat High Offset/Nested
Double Stick: # Cells End to End beside # Cells End to End, "Shotgun barrel style"
Triangle: 3 Cells in a triangle (1 cell nested on top of 2 cells)
Triple Stick Triangle: 2 Sticks of #Cells End to End + 1 Stick of # Cells High Nested, multiples of 3 Cells
Triple Stick Flat: 3 Sticks # Cells x # Cells Flat, multiples of 3 Cells
Quad Stick Offset/Nested: # Cells per Stick, 2 Sticks Wide x 2 Sticks High, Offset/Nested, Even Cell Counts
Capable of big sky flying or ball park low-n-slow! You can trust the Quick Wing in any flight condition. Any 20mm brushless motor system capable of turning a 4-6" prop at 50-150 watts or more will work well. She is sure to please the most speed hungry wing fanatic while still retaining very good slow speed handling characteristics. Quick "3D Jigsaw Puzzle" assembly in only 1-2 hours. World class laser cutting and design make this one of the quickest and most enjoyable balsa models you will ever build. You'll be amazed at the wide speed envelope the Quick Wing has. It easily goes from high speed to ball park flying with no bad habits. I'm totally comfortable recommending this kit as a good 2nd or 3rd model as long as you keep the power system modest. Advanced pilots can take the power as far as they like.
Specs: Wing Span 22.25" Wing Area 195 sq. in. Weight 8.5-14oz. Length 13.75" Average Cord 9.75"
Required: Covering;3ch+ Radio with elevon mixing; RX;2 Micro servos (HS-55 or similar); 50-200 watt 20mm motor; Prop; 700-1800mah+/- 2S-3S LiPB; ESC. If you select a receiver (RX), tell us which channel you need at checkout.
The HS-485HB updates the very popular HS-475HB by adding more torque and greater speed. With its top ball bearing, heavy duty, high impact Karbonite gears and high performance circuitry, the HS-485HB offers lots of torque and features excellent centering and resolution.
6S K6 Series 3800mAh 65C (247 Amps) Constant 130C (494 Amps) Burst. High discharge cells. Industry Standard XH balance plug. Weight: 640 grams. Measures: 44H x 48W x 140mm L. SKU Number: KYP6S3800HD65C
The new Sig Somethin' Extra has it all - good looks, incredible performance, Sig quality balsa and ply construction and every part in the kit is laser-cut!
This kit can literally be built as fast as the modeler can apply CA glue and accelerator. Fantastic flight performance using either 2-stroke or 4-stroke engines. The aerobatic capabilities of this model are virtually unlimited due to its thick airfoil section and very light wing loading. A perfect club contest airplane.
Kit Features: Balsa and Ply Construction, Pre-Cut Sheet Balsa Tail Surfaces, Durable Aluminum Main Landing Gear, Formed Tailwheel Wire, Molded Clear Plastic Canopy, Full Size Plans, Fast-Building 2 Piece Wing For Easy Transportation, Full Size Plans, Engine Mounts, Sig Easy Hinges, Pushrods, Complete Hardware Pack & Large Decal Sheet.
Wingspan: 51.5 in 1308 mm Wing Area: 614 sq in 39.6 sq dm Flying Weight: 4.25-4.75 lb 1928-2150 g Length: 48.25in 1226 mm Radio Required: 4 Channel, 4 Servos Recommended Engines: .40-.46 cubic in (6.6 - 7.5 cubic cm) 2-Stroke, .56-.65 cubic in (9.2 - 10.7 cubic cm) 4-Stroke
Special notes about electric from Dave: This model makes an excellent electric conversion. My first large electric was one of these on 20 1750FAUP Cells. Yikes, I'd love to do another one with modern packs! Here is how I'd do it. Yes, this is same chart as the 4 Star 40, similar weight and wing area. An under recognized yet excellent electric conversion model. Good weight to wing area. A little troublesome to get large NiMH packs into due to the wing tube. However, with Lipo's it's super easy to fit the pack. Below are my suggestions for a range of practical power systems.
Setup and Performance Chart
Motor
# Cells
Prop
Amps
Watts In
RPM
Thrust oz.
Pitch Speed MPH
Climb FPM
Est. Top Speed
Himax 3522-0990
3
12x6
41.7
469
8,470
62
48
1377
53
Himax 3528-800
3
12x10
37.4
421
6,950
66
54
1260
56
Himax 3528-800
4
11x7
36.6
549
9,770
65
68
1674
61
Himax 3528-1000
3
12x6
44.5
501
8,690
49
64
1490
54
Himax 3528-1000
4
11x5.5
51.4
771
11,660
61
85
2177
64
Himax 3528-1000
3
12x6
44.5
501
8,690
49
64
1490
54
Himax 5018-530
5
12x8
30.5
572
8,560
65
76
1839
63
Himax 5018-530
6
12x8
40.5
911
9,930
75
104
2766
73
Estimates based on manufacturers provided constants using E-Calc. High Quality 2100-3000mah used as trial cell in calculations. Presumed model weight of 76oz. @3 cells (added oz for higher cell counts). Actual performance may vary depending on components, accuracy of data provided by manufacturer, quality of battery, ESC, and many other factors.
Fits Himax 35 series outrunners and many others. Motor plate is drilled for 4 bolt pattern of 1" (25.4mm)diameter. This is a most common mounting pattern in motors of this class such as Himax 35XX Series and many others (does not fit AXI 28XX motors). Standoffs provided in 4 different lengths to aid your setup. Measurements provided so you can figure out spacing. Note, if motor is mounted inside front plate, it's thickness does not add to motor spacing off firewall. High impact plastic base plate supports ends of standoffs against firewall to a solid and rugged mounting system.
Fits motors with 1" (25.4mm) mounting spacing Max motor length- 53mm Max motor diameter- 35mm for Outrunners, 36mm for regular motors 4 sets of rods included lengths; 12.65" (32mm), 1.655" (42mm), 1.892" (48mm) & 2.125" (54mm) Font plate thickness: .117" (3mm) Rear plate mounting space: .140" (3.5mm) Weight- 1.6 to 1.8 oz. Includes all necessary hardware
 "Sig Kadet LT-25")
 "RRC K6 Series 16,000mAh 22.2V 6S")
 "Stand Off Motor Mount Small")
 "RRC K6 Series 7.4V 2S 1300mAh 65C")
 "GWS Mini LF Ball Bearing Servo Futaba")
 "Himax HC3516 Outrunner 1130 KV")
 "RRC K6 Series 2600 11.1V 3S 65C")
 "MayTech 25 Amp Harrier Supreme ESC")
 "A123/LithiumWerks LiFe Nano Phosphate 1800mah Single #18650 Cell")
 "2-Pole Red/Black Battery Zip Cord 14.5GA")
 "EDF064 w/2028-3 Brushless Motor")
 "RRC K6 Series 3300 18.5V 5S 65C")
 "RRC Gold Bars 33x8mm, 6PK")
 "RRC K6 Series 4500 7.4V 2S 65C")
 "MOLICEL Ultra-High Power 2800mAh Multi-Cell Pack, #INR18650-P28A Air")
 "Radical RC Quick Wing 20mm")
 "Hitec HS-485HB Heavy Duty Deluxe Ball Bearing Servo")
 "RRC K6 Series 3800 22.2V 6S 65C")
 "Sig Somethin' Extra Kit")
 "Stand Off Motor Mount for 35mm Outrunners")
