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How to match Graupner EDF 'Pod' 480 unit to my 100 inch sailplane.

Old 03-23-2009, 12:24 AM
Harry Lime
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Join Date: Mar 2008
Posts: 18
Default How to match Graupner EDF 'Pod' 480 unit to my 100 inch sailplane.

How do I ensure that my Graupner black 'pod' type Ducted Fan 480 brushed unit is matched to my 100 inch span sailplane as regards battery size, voltage, amps etc? Quite a mounthful, but I can break it down:

I have the lovely Graupner 'pod' EDF unit G-1401 for 480 Speed Race brushed motor with integral ESC. I propose to mount it on the front top of the fuselage to get the sailplane up to height and later for landing. I will use 7 or 8 NiCad cells, that is, 8.4 volts or 9.6 volts. More if needed, but it is only a brushed motor.

I don't want 'screaming' power or noise, but enough to fly the model gently upwards. Will all this work OK, or is the model far too big and slow to match a small high-revving ducted fan?

A friend has the Multiplex Twister EDF model with a, possibly unsuitable big ESC to handle his 3 cell Lipo 11.1 volts. (the ESC says 'from 7 to 12S'). The motor spins OK but there is no pull from the model before launching and not a lot of wind blowing from the tailpipe either. When hand-launched it just sinks down onto the grass.

I was told that the actual fan blades of a ducted fan model before launch may be spinning OK but are stalled, due to their high pitch, and don't really 'bite' into the air until a good flying speed is reached.

I am worried that the same thing might happen my set-up. The Graupner pod may spin up and even provide a pull feeling with plenty tailpipe wind but may not fly the big model into a positive climb and never get up to a 'matched' flying speed.

I hope someone can reply to this very common problem experienced by power modellers trying their hand at electric for the first time.

Harry 'the Pod' Lime.
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Old 03-23-2009, 01:58 AM
Dr Kiwi
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Join Date: Aug 2005
Posts: 1,726

I think that you are going to be VERY disappointed in an EDF on a monster sailplane - EDF's work best on small high speed airframes, big gliders need big slow turning props - I'd whack a big, low Kv, outrunner or a geared inrunner driving a 12" folding prop on the nose of that plane!
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