Arado 555 Mini Version for Indoors - RC Groups
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This thread is privately moderated by gke, who may elect to delete unwanted replies.
Mar 22, 2016, 01:13 AM
gke
gke
Registered User
Build Log

Arado 555 Mini Version for Indoors


I have a larger Arado 555 build based on Josef Poisinger's 1200mm version underway but on a whim decided to build a mini version for indoors. It uses Josef's wing outline directly and is simply scaled 50% to a 600mm span.

https://www.rcgroups.com/forums/showthread.php?t=180962

First version used all of the electronics from a WLToys PoleCat (F939). The geared motor decided to hack into the wing at full power and so I replaced it with 2 Chaoli 7x20 motors running reversed Hubsan X4 props.

https://micro-motor-warehouse.com/

Notional thrust ~50gm with AUW of the aircraft, including 200mAh 1s battery and rather too much glue, is 54gm.

https://www.rcgroups.com/forums/show....php?t=2009496

Foam is ColorBoard from Diaso. Elevons are inboard unlike Josef's elevons which are outboard, as they should be, but this proved to be too difficult/messy.

Video maiden flight outdoors at VARMS:

20160322 20160322 VARMS Arado 555 Mini (1 min 30 sec)


Indoor after a number of mods written up below.

20160420 Arado 555 Mini Flying Wing @ Waverley (1 min 6 sec)


The 4th photo onward shows the key elements of the build now. In summary:
  • Josef's wing plan and vertical stabiliser outlines (below) came from here http://members.chello.at/karla.poisinger/Profile.zip.
  • Wing span is 600mm and CG at 162mm from LE. Josef gives 322-330mm for his 1200mm wing and, as with all wings, tail heavy is bad although with this aircraft it is just embarrassing not fatal.
  • Inboard wing sections are under cambered at around the 30% of chord by about 6mm at the root and 3mm at the tip.
  • Tips wing sections have a step washout of 6mm at the root, which is the board thickness, and have no camber.
  • Elevons ended up being 50mm tapering down to 30mm wide at the centre; this is at right angles to the hinge. Trim is reflex is 6mm up initially but depends on what speed you plan to fly.
  • Pushrods are inboard and the servo to horn ratio is 1:1 for a throw of around 12mm.
  • Blenderm was used for hinging but Magic drafting film tape works fine as well.
  • Motor down thrust is around 5 degrees.

CG position calculated using WingCGCalc. Wing Plan used is HERE.

It is great fun to fly and very agile with absolutely no tendency to drop a wing in tight turns. As with most "wings" increasing elevator gently along with throttle, the latter to overcome the drag, it simply slows it down. So just like the big ones it has a good speed range. Flies best on around 60% throttle but 40% indoors with a bit of up . Balkenkreuz added to aid orientation.

Now added mono-wheel to attempt ROG take-offs at Josef's suggestion . A drop of glue added to the bottom of each rudder skeg to form a sliding point for wooden floors. Works beautifully although the amount of glue on this prototype is getting ugly .

New version, if built, would hide FCB in fuselage nose and maybe try three motors .
Last edited by gke; May 08, 2016 at 11:50 PM.
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Mar 22, 2016, 05:28 AM
Mack
Peter Mack's Avatar
Nice model and smooth flying Greg. Hope to see it at Waverley on Thursday? We could compare notes on our experience with twin Chaoli/Hubsan motor powered models - or are they the same motor?
Peter
Mar 25, 2016, 05:12 PM
gke
gke
Registered User
Quote:
Originally Posted by Peter Mack
Nice model and smooth flying Greg. Hope to see it at Waverley on Thursday? We could compare notes on our experience with twin Chaoli/Hubsan motor powered models - or are they the same motor?
Peter
Thanks Peter. The longer motors fit the Hubsan but in my case came from Micro Motor Warehouse. They are wired in parallel so no thrust vectoring. The new links in the updated blog show the motor testing for interest.
Mar 30, 2016, 04:44 PM
Tri-Quad-Hexa-Octo-copters!!
Nice work on this wing too Greg! I need to build one
Cheers
Jim

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