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Old Oct 10, 2008, 10:31 AM
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Joined Jun 2008
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GWS A-4 pusher build

Need some help picking out my motor. Leaning toward a Grayson Super Mega Jet and an APC 6x4 but not sure. This combo works great on my Shumate F-14. Seems like AUW for the A-4 is over 30oz with the ducted fan and landing gear. Since I am not installing either she should top out under 30oz. Haven't found much information out there. Any opinions would be appreciated.
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Old Oct 11, 2008, 10:28 AM
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Maryland, USA
Joined Oct 2006
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I have been thinking of building a pusher GWS J-10, which is the twin (same size/weight) to GWS's A-4. If/when I do, I will try this new Scorpion pusher-jet motor. There is an announcement with some performance information about that motor and another smaller new pusher motor here (I would definitely go with the bigger one).

I currently have a pusher-powered GWS F-15, which is also about the same size and weight as the GWS A-4, but a quite different shape, and I power it with a Medusa MR-028-040-1700V2, which is on this page. With a 7x5 prop, it's just perfect for the plane, and gives 1:1 thrust and plenty of speed, but the only thing is that it's physically kind of long, so it might not be so convenient to mount on the A-4 and J-10, the way they have the pusher mount designed (hard to tell from the diagrams). It works fine on the F-15 though, because it sits partially on top of the exhaust nozzles, and just required a little trimming of the foam.

There is a short thread about the GWS A-4 as a pusher here.
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