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Old Feb 24, 2014, 11:15 AM
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TrevorJS's Avatar
South Africa, EC, Port Elizabeth
Joined Oct 2012
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Build Log
Hawk-Tx Correx Sloper Build

The Hawk-Tx is a Correx version of the BAE Hawk T1, designed for slope soaring on the popular Port Elizabeth (South Africa) slopes such as the PE Slope Rebel's Maitlands. The BAE Hawk has long been one of my favourite jets, and it was only a matter of time before I got round to making a slope version. It is also used by the South African Airforce for Jet training after SAAF pilots have graduated from the Pilatus PC7 Mk2.

I kept a keen eye on the ubiquitous Mig 7 when designing this plane, and ended up with a similar wing area and overall size. It remains to be seen if the Hawk can challenge the Mig for dominance on the slope...

I'll be posting the plans after a few test flights, but here are some pictures of the build process. I included my method of moulding the canopy from soft drink bottles, for interest's sake as it really needs a well-shaped canopy to pull-off the Hawk look.

The Hawk also has an all-moving elevator which has the dual benefit of increased maneuverability, along with the ability to trim your wing/stabilizer incidence angle from the Tx. A fixed canopy and removable wing has been used for the first prototype, although if better access to the nose is required for batteries and Rx, a removable canopy can be implemented.

Specifications as follows:
Wingspan: 1300mm
Length: 1000mm
Wing area: 53cm2
Airframe mass: 715g (without battery & Rx)
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Last edited by TrevorJS; Feb 24, 2014 at 11:31 AM.
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Old Feb 24, 2014, 11:40 AM
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South Africa, EC, Port Elizabeth
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Elevator Installation

The all-moving elevator is connected by a 2mm length of piano wire passing through the rear of the fuselage. The second bend can only be done after passing the wire through the fuselage. An elevator horn is added to one of the elevators and connected to the servo.
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Last edited by TrevorJS; Feb 24, 2014 at 12:09 PM.
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Old Feb 24, 2014, 12:19 PM
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South Africa, EC, Port Elizabeth
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Making the wings

The wings are made using the traditional SPAD technique using 2mm Correx and running the flutes chord-wise over a wooden spar. A 3mm aileron is glued to the trailing edge and clamped in place while holding down the leading edge to produce the characteristic flat-bottomed airfoil.
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Old Feb 24, 2014, 02:34 PM
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What glue do you use for Correx?

Nice build thread BTW.
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Old Feb 24, 2014, 02:56 PM
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South Africa, EC, Port Elizabeth
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Most of the time its hot-melt glue from a glue-gun (eg. fuselage formers etc.), but some exceptions are gluing the wings together with Contact adhesive as you have more time to get things aligned. I also use epoxy for the wing joiner.
TS
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Old Feb 24, 2014, 03:23 PM
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South Africa, EC, Port Elizabeth
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Final Finishing

I decided to go with an "arctic cammo" colour scheme due to availability of vinyl colours in my stores, and have fitted the servos and control horns/rods. I also added a foam nose cone and covered with vinyl to protect from impacts.
Just need to finalize servo settings and wing location as well as adding jet intakes and she should be ready to maiden.
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Old Feb 24, 2014, 11:26 PM
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Australia, SA, Morphett Vale
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where did you get the plan from? looks great
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Old Feb 25, 2014, 12:55 AM
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South Africa, EC, Port Elizabeth
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Beautiful Trevor , still cant believe you built that from correx
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Old Feb 25, 2014, 07:47 AM
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South Africa, EC, Port Elizabeth
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Quote:
Originally Posted by Desert flier View Post
where did you get the plan from? looks great
I draw up my own plans based on a 3-view drawing and some mods to improve slope soaring performance (larger wings etc.) I just try to keep the design as simple as possible while keeping the scale shape, as far as Correx will allow, bringing in some aerodynamic factors here and there... In the case of the nose and jet intakes (still to be added) foam is the way to go as the curves are just too complex to do nicely with a flat piece of Correx. All these skills I learnt from Flying Beagle, Bakkie, Shawn and the boys on the Correx "free plans" website! Their videos are awesome!
TS
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Old Feb 25, 2014, 09:13 AM
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South Africa, EC, Port Elizabeth
Joined Feb 2013
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Looks Awesome Trevor. Looking forward to seeing it fly on the slope.
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Old Feb 25, 2014, 12:25 PM
.....till the wind drops.
Sean Oelofse's Avatar
Port Elizabeth, South Africa
Joined Oct 2006
3,544 Posts
Quote:
Originally Posted by TrevorJS View Post
The Hawk-Tx ...........as it really needs a well-shaped canopy to pull-off the Hawk look........
Agreed!!!........BIG TIME!!..........a good scale.....scale'ish.....canopy makes the plane!!
Awesome build TJS!!!
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Old Feb 25, 2014, 01:06 PM
Missing you too FB!
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South Africa, Eastern Cape, Port Elizabeth
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wow nice!
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Old Feb 26, 2014, 12:37 PM
Spin dizzy.....
hornet29's Avatar
South Africa, GP, Johannesburg
Joined Jul 2009
142 Posts
really nice job... love the arctic camo.

I, too, wonder where you find the time to make these masterpieces..
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Old Mar 01, 2014, 01:23 AM
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South Africa, EC, Port Elizabeth
Joined Oct 2012
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Jet Intakes and Wing Mount

I sanded some polystyrene to form the jet intakes and covered them with vinyl to match (almost) the cammo pattern. The aileron control horns and push rods are also in place as well as the dowels for the elastic bands holding the wings in place.
Hope to maiden this weekend!
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