yet another scratchbuilt twin boom pusher - Page 4 - RC Groups
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Apr 13, 2012, 06:45 PM
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xatled99's Avatar
LHS had some 5/32" music wire, so I bent some new landing gear. With that and foam wheels instead of rubber, I should be able to save about 5 oz. If I can get the AUW down to 70oz, that would put the plane at about 20 oz/sq ft wing loading, which would be tolerable.
Last edited by xatled99; Apr 28, 2012 at 04:15 PM.
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Apr 14, 2012, 05:10 PM
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Remaiden went very well today. It flew great with only a small amount of trim required; even managed a respectable touch and go on pavement. Unsurprisingly, the battery placement had to change due to the lighter fuselage. Depending on how the lighter landing gear works out, I may consider swapping in the 3s power system.
Apr 18, 2012, 05:51 PM
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xatled99's Avatar

one pound lighter

Swapping in the wire gear, lightweight wheels, and the 3s power system brought it down to 64oz. CG is reasonable with the battery all the way up front. Looks to be about 48oz static thrust at 25A with the 11x6.

Approximate weight saving distribution:
foam wheels: 2oz
wire landing gear: 4oz
smaller motor: 2oz
smaller lipo: 4oz
fuselage holes: 4oz
Last edited by xatled99; Apr 21, 2012 at 09:56 AM.
Apr 28, 2012, 01:34 PM
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Three flights today with the 3s configuration. Best flights yet!

It flew powerfully, gracefully, and economically; 8 minutes of flying took the pack down from 90% to 50%. The 11x5.5 APC-E prop was fine. Enabling the motor's brake improved the glide. Slow flight characteristics were good, as were both power-on and dead stick approaches. I could trim the plane for level flight at about half throttle and then fly it around all day long with only the rudder. Stalls were pretty gentle and it would only drop a wing if you really pushed it. Unlike before, I didn't notice any yaw instability on short final.

Time to start installing the FPV gear.
Last edited by xatled99; Apr 28, 2012 at 06:00 PM.
May 05, 2012, 03:28 PM
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First FPV flights today. Not too shabby! Pavement takeoffs were pretty straightforward. Pavement landings were trickier, but doable. Power-on, flat approaches seemed best.
May 20, 2012, 03:59 PM
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xatled99's Avatar
This was actually flown LOS, not FPV.

scratchbuilt rq7a shadow osd (7 min 51 sec)
May 20, 2012, 04:29 PM
On a holiday?
boopidoo's Avatar
Wow I think you might need to check your video system, doesn't look very good IMO.
May 20, 2012, 05:19 PM
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xatled99's Avatar
No, it really doesn't. I had much better results with my previous camera.
Aug 18, 2012, 12:29 PM
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I like your mock up - I have liked that design for a while. It seems like many commercial and military drones use the inverted V tail design twin booms.
My question is: Why invert it? What does it add to the design? Is it more efficient or just very cool looking? (lol)
Thanks, I appreciate your patience with questions like these.
Aug 18, 2012, 12:41 PM
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Toysrme's Avatar
using twin booms, it gives you yaw control without the need for two rudders.
it's inverted because having it as a V interferes with ground clearance.

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