Power me with any Power system in the 300 to 700 watt range turning 10-13" props and pitch speeds at 60mph or less.

The "US Army" model pictured foreground is setup 5 degree dihedral with GWS outrunner #007, 983 KV, 3S 3200 pack and weighs 3.33lbs. (52oz). Any of the props below would be good depending on the power level you seek. This model feels like a perfect trainer in flight (except I have my throws a little higher than you'd use for instructing) and is capable of barnstorming aerobatics enough to satisfy anybody. In fact, it will just hold a knife edge with minimal mixing. I fly it currently with a 12-8 APC-E prop and it has unlimited vertical early in the pack. However, I like it best for it's reasonably powerful yet "on the wing" aerobatic capability. She is really sweet! For a student, use this setup with 11-5.5 or 11-7 until they are ready to handle more power. The power "IS" in the prop you know. For styling, I couldn't help myself, the tundra tire look just seems to really set off this decal set.

11-5.5, 28.7A, 323 watts, 43mph Pitch Speed, 50oz thrust, Max climb 1542 ft/nin @47 degrees.
11-7, 33.2A, 374 watts, 53mph Pitch Speed, 54oz thrust, Max climb 1790 ft/nin @51 degrees.
12-6, 36.9A, 415 watts, 43mph Pitch Speed, 59oz thrust, Max climb 1938 ft/nin @58 degrees.
12-8, 43A, 484 watts, 54mph Pitch Speed, 63oz thrust, Max climb 2208 ft/nin @64 degrees.

The Navy Trainer shown background is setup 1 degree dihedral, GWS 008 Outrunner 842 KV, 4S 3000 pack. Weight 3.5lbs (56oz.). This is my brutal stump pulling setup. I fly it currently with a 12-6 prop. As you might imagine from the spec's below it's near pattern like, only slightly heavier and vertical is no problem here. More power than I was originally planning for this kit. We put it together to test the lower dihedral and a power system that I thought nobody would ever want to exceed. Note, with 1 degree dihedral, yaw is pure like a pattern ship, Ailerons must be employed to execute a roll or turn. This is truly brute powerful and outside of where I think most people will like this model best, however I present it here for your consideration along with all probable props you might use here.

10-5, 24.9A, 374 watts, 50mph Pitch Speed, 56oz thrust, Max climb 1535 ft/nin @42 degrees.
11-5.5, 34.7A, 521 watts, 51mph Pitch Speed, 73oz thrust, Max climb 2171 ft/nin @58 degrees.
12-6, 45.5A, 683 watts, 52mph Pitch Speed, 89oz thrust, Max climb 2807 ft/nin @90 degrees.

(Note pitch speeds higher than 54mph are NOT reccomended, this is a "tractor", not a "racer".) Over time, consumers have been slowly trained to accept heavier and heavier trainers in the ho-hum 40 size ARF trainer market. The normal range is 5lbs (for a light weight one) and 7lbs near the top of the range with 5.5 t0 6 lbs being more normal. Our Intern 66 smashes today's bloated trainers and sets a new weight standard far superior to even yesterdays finest hand built kits. I've often helped modelers trying to convert 40 size models with 3S power systems. This is usually a big error because the watts per pound you need to get good performance is nearly impossible to obtain in most cases. Here the model is so exceptionally low in weight that you can easily make the "common mistake" a super successful combination here. Never fear, even my lowest wattage setup above will outperform the average glow trainer. I've not listed any slouch setups here.

I am confident in saying this is probably the lightest weight 40 size trainer ever kitted and offered for sale in the history of our sport. It's so light weight perhaps using the word "probably" is being way too cautious but I wish not to offend any excellent accomplishments unknown to me. All in all I feel this is some of the best work I have ever done. You'll really enjoy this build and you'll have a unique and extra special model as a reward.

Specs:
Weight: 3lb 4oz-4lb
Span: 66 inches
Area: 747sq inches
Length: 48 inches

Requirements: RX, 3 mini servos, 250 to 700 watt power system; Wheels: Main: 2.25-3.5 inches; Tail: 1-1.25 inches; & retainers.

See Free Scale Offer in "Radical Specials". Unadvertised deal!

EZone discussion about this kit. Check out many build photos and see the amazing fit and construction of this kit.

"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.