T-25 Centurian from Estes

27 Dec 07 - Minor damage repaired and re-flown.

The T-25 being
modelled by Nathalie
N of launches / Time 6 1 hour 17 mins  
Wingspan 36.1" 92 cm    
Wing Area 215 in 13.9 dm    
Flying Weight 16 oz. 455 g with D motor fitted  
Wing Loading 10.7 oz/ft 32.7 g/dm    
Wing Cube Loading 8.8 - Aerobatic (OK for rocket + slope soaring)  
Receiver Webra Nano S6 - 6 channel - PPM - 35MHz
Batteries 280mAh 2/3AAA- 4 cells - NiMH
Servos Elevator - Hitec HS-81MG
Ailerons - 2 x JP Naro HP/BB
Flight performance Slope - Flies well but needs a reasonably strong breeze

11 Jun 13 - The fuselage is obviously not ABS as thought, the Stablit Express really didn't bond too well.  I removed the nose section as it had now all but snapped off and reattached it with fibre glass cloth and cyanoacrylate

27 Dec 07 - Test flown today after completing the repairs (with Stablit Express this time), and nearly broke it again due to the strong wind.  Despite that minor problem it flew well and clocked up some more time.  I have a feeling that the fuselage will need replacing in the medium term as the ABS is brittle despite being pretty thick.

24 Nov 07 - Took the model flying today after putting some glue on the nose.  It was really chilly and had a pair of gloves on a dropped the model, causing the nose to crack again and the tailplane to break free.  Both fairly minor damage, but it stopped me flying it again.

16 Sep 07 - Had a rough landing today, out of sight of my standing position.  It cracked the nose of the T-25 in several places, but is easily repaired.

2 Sep 07 - Test flew the in-flight ignition to today with a D11-P motor; boy did it accelerate fast.  I need to get the nose up a little quicker to gain more height, but around 150 ft (45m) gained in 1 second.  I wonder if I can get hold of some 'E' motors?

1 Sep 07 - I just fitted an in-flight boost facility.  This is a 5A Electronic Speed Controller (ESC) fitted under the wing and powered by a 2S 340 mAh LiPo battery pack.  The LiPo pack is also mounted up against the front of the motor tube to take the load when the rocket is fired.  The output of the ESC is a 2-pin socket that comes through a moulding hole in the fuselage.  The LiPo is mounted on the CofG so trim is not affected, but there is a 50g penalty with the system in place.  I'll probably leave the ESC in all the time as it only weighs about 20g with all the wires and an extension lead to the RX.  In theory the system could be used to self-launch from the pad.

22 Nov 03 - This is a Almost Read To Fly (ARTF) Rocket Booster Glider made by Estes, which took my fancy. It is quite heavily built, but then it does have to withstand rocket launches with a peak thrust of around 25N (5.6 lbs.) and sustained burn of 9N (2 lbs.). The model will therefore accelerate off the launch pad, vertically, at around 4.6g and is quoted as reaching 100 mph (160 kph), which seems likely. Most of the time it will be flown on the slope with occasional rocket launches as the motors are quire expensive (~7 for 3).

I fitted 2 smaller aileron servos, which will be mixed to provide Flaperons. I also intend to produce a modification to fit smaller motors which can be lit in-flight for a boost. I'm even considering making an electric power plant, that fits down the motor tube, for flat field flying.

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