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TrevorJS's blog
Posted by TrevorJS | Dec 10, 2013 @ 03:23 PM | 2,982 Views
I set about trying to build the "ultimate" Correx slope glider and decided on a 2m wingspan as a manageable size. The Foxx (the extra X for correX) is based on the MDM Fox aerobatic glider which has a nice sporty shape to it, and a conventional tail. I wanted to make it lighter than the Fouga and used the Radian foamy as a reference as it has the same wingspan. I don't think the Correx wing aerofoil shape will be nearly as efficient as the Radian but the weight turned out to be quite favorable in comparison at only 95g heavier! Of course the benefits of a Correx version is low cost, quick build and durability on the slope!

Foxx - 880g (airframe) 1000g (AUW)
Radian - 775g (airframe) 905g (AUW)

I don't think the wing aspect ratio could get much better with Correx as you tend to get a kink in the upper skin over the spar when reducing the chord. The spar needs to be thick enough to withstand the full wing load, so cannot be too thin.

I'm quite pleased with the way the fuselage turned out, as it took quite a bit of experimenting to get the flat shape right to roll into the 3D fuselage. The wing is removable, although mid-mounted, and will have elastic bands over the upper surface next to the body to keep it in position during flight.

I hope you all enjoy the photos - more details after the maiden flight!

PS - I'm working on the plan and will post after the Maiden flight....Continue Reading
Posted by TrevorJS | Nov 20, 2013 @ 02:56 AM | 1,687 Views
After the F18 Hornet I was looking for something to fly in lighter winds on the slope but retaining the durability of Correx. Considering the amount of weight in the fuselage, I decided on a DF Alula inspired flying wing, but increased the wingspan to 1200mm. The AUW came out at 480g with a few (>100) vinyl feathers for decoration, and have got it to glide in the garden by playing with CG and a bit of reflex in the elevons.
I will post more after some test flights. Some feedback from the experts was to increase the elevon width closer to the wingtips for better roll control.
Posted by TrevorJS | Nov 20, 2013 @ 02:39 AM | 1,975 Views
My next scratch-build Correx model for slope soaring took the shape of an F18 Hornet as I wanted to do something more modern than all the warbirds already done in Correx. I chose the Hornet as its wing design lent itself to being extended for sloping while still remaining recognizable as a Hornet.
The wingspan is 1200mm and the 2mm correx wings are removable from the top of the fuselage. The elevators are all-moving, connected through the fuse, reinforced with ply at the pivot. I initially mounted the elevator servo in the access hatch under the wing but found there was just too much flexibility in the connections and so I moved the servo outside to the rear with a short pushrod.
The fuselage was designed with locating tabs to make it easy to clip together and keep everything aligned. The long nose means very little noseweight is required to balance the plane, depending on what kind of nose you put on it. I am busy with a composite nosecone but a wooden block would also work. I will also add a removable plastic canopy as the battery is right up front.
After initial test flights I moved the wing forward 15mm and closed up the air intakes. This has increased the tail moment and overall stability of the plane while also reducing drag.
The AUW came out to around 1000g and it does need a bit of wind to fly nicely but its very maneuverable.
The colour scheme I chose was based on the Canadian aerobatic team with Tiger-stripe theme, but minimising the use of vinyl can save a...Continue Reading
Posted by TrevorJS | Nov 19, 2013 @ 04:14 PM | 1,471 Views
On a trip to Germany in August I saw the Fouga Magister at a science museum and was struck by the flowing lines and unusual V-tail. This ended up being an ideal candidate for a new Correx slope design and I used Flying Beagle's Impala plans as a basis for the model. The length was increased and the wings extended and mid-mounted. The V-tail is held at its angle with reinforcing piano wire inside the flutes. Wingspan is 1600mm and it is a really good flier, with plenty of lift in those long wings. I posted the plans on Flying Beagle's Correx build thread but have also attached them here for anyone wanting to have a go at building one.

CorroFouga Maiden (1 min 36 sec)

...Continue Reading
Posted by TrevorJS | Nov 19, 2013 @ 03:57 PM | 1,394 Views
Saw the Slope Rebels at Maitlands one day and decided to give Slope Soaring a try. The first correx build was the Impala but I didn't have any 2mm correx at the time so made the wings from 3mm, and extended them by 200mm. Impala was a bit heavy but is still my best "gale force" sloper. I built the CorroStang next with my son and have had great success with this plane. It flies beautifully and looks really great. Lost it on the mountain at Maitlands in a gale but fortunately found it about 500m downwind 2 days later! My son loves to fly this one as he always wanted a P51 Mustang.
Posted by TrevorJS | Nov 19, 2013 @ 03:42 PM | 1,419 Views
Built this 1.7m powered glider from free plans, but by the time I finished it, I had started slope soaring and decided to leave the motor out. Flies really well and quite fast but keeps breaking wings on hard slope landings!
Posted by TrevorJS | Nov 19, 2013 @ 02:47 PM | 1,383 Views
My interest in building and flying model aircraft started way back when I was at high school, when I flew control line models with a friend. RC was out of reach in those days! In December 2011 my interest in the hobby was re-kindled when my son (coincidentally) received an Artech Wing Dragon from Santa for Christmas. Not the easiest plane to learn on, but through sheer persistence we taught ourselves to fly while practicing on the simulator. My first attempts at self-built planes used low-cost materials such as foam covered with paper soaked in wood glue! Quite stiff but too brittle to withstand hard landings! I slowly used more and more balsa as mu building skills improved but crash landings prove to be expensive both financially and emotionally...