The Flight of the Corvus Corone

The Flight of the Corvus Corone

Postby ash » Sun Dec 02, 2012 10:31 pm

A year or two ago a musical genius named Paul McLaney produced a fancy prog-rock album called Voyage of the Corvus Corrone: http://www.voyageofthecorvuscorrone.com/



And for some reason I felt the need to use the name Corvus Corone (latin for Carrion Crow) for one of my models (many of them are named after birds). I don't remember how, but the Classic B team racer is the one that got the name. Probably something to do with the common traits of a crow and a loud black team racer...

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First order of business - acquire an eligible engine. Non-Schnuerle, say the rules, so a late '60s Enya 29 IV Special courtesy of Barry Martin should do the trick:

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About this point I decided to build this thing with no plans, no drawings, no sketches. All was conjoured directly from imagination, memory, trial and error... beginning with the engine plate and crutch:

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The aluminium crutch spreads the engine loads widely across the wooden fuselage structure

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Cedar stringers get epoxied to the beech crutch to form the spine of the fuselage

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M3 threaded aluminium inserts to secure the aluminium and beech crutch components together

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Tailplane is 5mm balsa edged and sparred with 3mm cedar

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Tailplane is covered in light glass cloth

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Fresh out of the press and due for a trim

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Same for the wing - a rejected Mr D Goodyear wing. The model was initially supposed to be a full-fuselage Mr D, but came out a bit more sleek

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Ready for fuselage construction and hardware

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First, the turtledeck is built up from 5mm balsa and shaped

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The fuselage top is rough shaped and ready for internal shaping

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The cowl is build up from layers of balsa sheet.

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Engine fits neatly and is easily removeable.

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Innards get a coating of epoxy and glasscloth to protect from heat and fuel

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UC legs get glued into their poplar ply mounting plate and stitched with steel wire

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Attached thusly, betwixt the cowl and belly:

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Fuselage belly and cooling duct

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The belly gets capped and mummified

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The tail skid is a 3mm poplar ply fin lined with a curved bicycle spoke

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Fuselage nears completion

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Tail attachment time - epoxy it

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All in one piece for the first time. Pushrod next.

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The turtledeck gets glued back on now that the controls are complete

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Circular bellcrank and appendages all fitted up

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The engine bay cover gets some extra glass around the nose to protect against errant chicken-fingers during starting

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The outside of the cowl is glassed, now to carve away most of the balsa inside

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Nearly there... down to the glass in spots where the engine gets close to the cowl

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Canopy buck and random MDF scrap stuffed into a 600ml bottle and heatgunned to death to shrink the plastic onto the buck

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Cut the canopy off with a scalpel

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The canopy sits in a shallow trench and will be glued in with epoxy and microballons to form a smooth seam.

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Prop nut and extension are now complete

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A hand made fuel shutoff by force of file and hacksaw

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Balsa packing holds the tank in place until the mounting lugs are made. Fuel outlet goes straight to the shutoff.

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Re-fuelling valve is made of a brass audio cable connector from Jaycar.

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The whole metallic rigmarole in situ.

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ElectroNipple™ is turned from a brass 3/16" BSW screw with a 2mm hole drilled up the middle and sturdy wire soldered therein.

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The same hot-thumb I use to provide glow-juice to my Goodyear engines also works here thanks to the ElectroNipple™.

Thanks ElectroNipple™.

ElectroNipple™. New from Mattel.

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Sanding, sanding, sanding...

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Fancy painting handle clamps onto the undercarriage legs.

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Primer coat #1

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Two wet coats of acid-catalysed primer.

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A bit of manky old spot putty on the pin-holes and weavey patches and lots of sanding.

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A couple of light coats of black.

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Blacker than a black man's cape.

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Stripes for visibility and some feathers for theme.

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Guts of the creature.

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Corvus Corone - The Carrion Crow.

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The crow in charge - needs a name.

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The Enya 29 IV Special lives in there somewhere.

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First flights were today at windy Mercer. It took a few goes to get a setting that the engine liked, but the timed run was at 23.7/9 - 95mph - 152km/h for 34 laps on 30cc of stunt fuel -10% nitro, 20% oil and an APC 8x7 prop. That's a damn good start and should get over 45 laps on a tank with fancy fuel and some fidgeting. It starts easily once primed and flies like a charm. Very happy!

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More and bigger pictures here: https://picasaweb.google.com/1031821656 ... lassicBTR#

~ Corvus Corone - Classic B Team racer. Designed and built by Adrian Hamilton

~ Enya 29 IV Special - 5cc Glow Engine. Delrin venturi to fit the standard TV throttle needle valve. Low compression head modified to high compression specs.

~ 30cc fuel tank with custom made filler valve and shutoff. Trial fuel is 10 % nitro, 20% oil (30% Castor, 70% synthetic). Race fuel is probably going to be 20% nitro, 20% castor, 20% IPA and maybe 20% ethanol. Experiments will decide.

~ Propeller - APC 8x7. Will also try 7.8x7, 8x8, 8x6 and 8.5x6

~ Lines - 2 x 0.4mm x 17.69m (9 laps per kilometre)

~ Trial run - 23.7/9 = 152km/h = 95mph for 34 laps. Target speed = 90-100mph for 45+ laps (NZ Classic B is time limited, so higher speeds are not really called for).
Adrian Hamilton > CL + FF

http://ashcustomworks.com
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Re: The Flight of the Corvus Corone

Postby Bob Palmer » Tue Dec 04, 2012 8:33 pm

Great build log. Nice model.
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Re: The Flight of the Corvus Corone

Postby ash » Sat Dec 15, 2012 9:46 pm

Cheers Phil. I look forward to seeing more Classic TR models emerge next year.
Adrian Hamilton > CL + FF

http://ashcustomworks.com
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Re: The Flight of the Corvus Corone

Postby ash » Sat Dec 15, 2012 9:51 pm

So, the model is done and tested, but I need some additional equipment to make a race of it.

Pictured below - the new adjustable handle for the pilot and arm-mounted glow driver for the pit crew:

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The Glow driver is strapped to the left forearm and the hot-thumb connector plugs directly into it.

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The frame is made from two pieces of laminated PVC plastic sheet bent to shape with a heat-gun.

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A recycled ammeter and a couple of banana plugs make up the front panel. The loop at the rear holds a 2.5Ah Cyclon SLA 2V cell.

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The handle is made from a rosewood offcut drilled and routed to shape. Fluoro cord wrist strap also makes it easy to see in the grass.

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Adrian Hamilton > CL + FF

http://ashcustomworks.com
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