18 Jul 04 -
Hatch fitted to underside - photos added. 18 Jul 04 -
Hatch fitted to underside - photos added.
| N° of launches / Time | 32 | 6 hour 26 mins | ||
| Wingspan | 36¾ " | 92 cm | ||
| Wing Area | 303 ¨" | 19.5 dm² | ||
| Flying Weight | 1 lb. 7 oz | 650 g | 1 lb. 6¼ oz | 630 g |
| Wing Loading | 10.9 oz / ¨' | 33.3 g/dm² | 10.6 oz / ¨' | 32.3 g/dm² |
| Wing Cube Loading | 7.5 - just above a "Trainer" | 7.3 - just above a "Trainer" | ||
| Motor |
Typhoon 15 brushless (High-End Technology) |
|||
| Propeller | Ramoser Technik & Design VarioPROP 2-blade hub with 10.4" Scale-Optic blades, set at approx 5" pitch | APC-E 10" x 5" | ||
| Batteries | 2 x 2S Kokam 1500mAh LiPo (3000mAh total, 24A max.) | 3S 1800mAh Shark Power 20C LiPo (36A max.) or 3S 1800mAh FlightPower EVO20 20C LiPo | ||
| Speed Controller |
Hacker Master 30-3P - 30A - 6 to 10 cells - BEC & Brake - Programmable cut-off voltage |
|||
| Receiver / Battery | Webra Nano S6 - 6ch - PPM - 35 MHz | |||
| Servos | Ailerons - 2 x Hitec HS-56HB | |||
| Elevator - Hitec HS-56HB | ||||
| Rudder - Hitec HS-56HB | ||||
| Static motor parameters | 16.6A @ 6.3V giving 5900 rpm and 105W, approximately 73W/lb. Full throttle motor run is approx. 11 minutes. | 25.3A (14C) @ 9.9V giving 9150 rpm, 250W and approx. 180W/lb. Thrust is calculated at 1185g (41¾ oz.). | ||
| Flight performance | Spirited performance, but slightly lacking in the vertical - going to swap to a 3S pack | Vertical climbs completely effortless, although the model likes to go offline in the climb. The model can now complete almost all manoeuvres except knife edge (too little rudder authority) | ||
14 Mar 07 - I have been suffering occasional spells of flutter, which I have narrowed down to the hatch. I will have to add some stiffening to it to prevent recurrence.
9 Sep 06 - The model has been modified by fitting a hatch in the underside of the fuselage and to take a 3S Shark Power 1800mAh (20C) pack. This meant re-bending the undercarriage legs, to go around the pack, which means a narrower track to maintain ground clearance. I also decided to replace the Ramoser Technik & Design VarioPROP with an APC-E 10" x 5" propeller as it is a lighter solution.
3 Dec 04 - I fitted the 3S Kokam cells some time ago and decided I really should update this page. The weight increase due to the new page is only about 5g (0.17 oz.) and therefore negligible. The power to weight ratio, however, has increased by 58% with the loss of 33% of the original battery capacity. The model now leaps off the grass and will climb vertically almost without limit. I measured the thrust the propeller produces and it is 960g (33.9 oz., giving a thrust to weight ratio is 1.46:1 - pretty damn good.
18 Jul 04 - Just completed the model and checked it through. I am thinking of getting a 3S pack of the new 2000 mAh cells (15C) which will be heavier but give more power due to the increased voltage and current sink capability (30A max.).