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Old 02-25-2014, 06:54 PM   #1
solentlife
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Location: Ex UK Brit now in Latvia west coast - Ventspils
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Default $100 Contest entry : Twin Pusher "Sport Scale" TU-144 Concordski ?

Ok ... all know my success with the twin EDF sport-scale Concorde. I mentioned before that I consider building a twin pusher - which should have more scale-like nacelles and more power to really fly ... The twin EDF actually flies better than I expected after finding the Mad Thrust EDF's to be rubbish.

I propose same size airframe ... 1200mm LOA, 650mm span with :


Floater-Jet Replacement Motor (AXN-2208-2150)





Floater-Jet Replacement Motor (AXN-2208-2150)

Specs.
RPM/V: 2150kv
Max Watts: 180w
Max Amps: 20A
Max Volts: 11.1 (3s)
Turns: 16t
Resistance: 0.085Rm
Magnet type: N45SH
Idle Current: 1.52A
Shaft: 3mm
Weight: 44.0g
Suggested Prop: 5x5 / 6x4




2 of those pushing it with 5x5 props. Lighter than the EDF's ... I can move batterys back or run of a larger single 3S. Amp draw on a 5x5 is reckoned at 17 - 19A each.
Or I can butcher my twin parkjet for the more powerful 3200kv Heli motors ... needing serious twin battery power then ... and serious ESC's.... amp draw here is more like 45A each ... on 4S but HUGE power output on a 4.1x4.1 prop. One on it's own pushes my 50mm T45 to over 180KPH in pusher mod form.

So the question is :

Do I push the design to limits with power or build a reasonable flyer with less power ?

Nigel

222kph PKJ,EDF Concorde, Mini4,Mig3,T45,PKJ twin,ME109,Edge540,Cessna182,Skymaster Biplane,F15,F16,Badius,Ultimate,SE5,Qbee10,450 Heli,V911,J3 Cub Founder 9x forum: http://groups.yahoo.com/group/Flysky_RC_radio/
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