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Posted by scarborofun | Jun 18, 2014 @ 08:36 PM | 2,805 Views
Got a stack of elections placards donated to me (saved from landfill). Built 2 bi-planes. One with airfoil wings and one with flat wings. Considered the extra effort to have an air foil in comparison to the difference in flight characteristics the effort seems a bit of a waste.
However, for stability you'll need at least one LE spar. I'll try a double layer next time, using spray contact glue and arranging flute runs 90 degree.

I built a little tool out of a coat hanger and a scalpel blade that easily clean cuts only one side of a flute. This makes the sheet easily bent to round shapes, but also it creates a hinge for control surfaces. For long runs I had to score part of the hinges all the way as they got too stiff.

A fuselage built with rounded corflute using 6mm depron as frames turns out incredibly stable and stiff, even for torsion forces. In critical spots (wing mount) I used laminated wood frames.

Interesting fact: all the corflute planes have a characteristic motor sound, like it is a musical instrument....Continue Reading
Posted by scarborofun | Jun 04, 2013 @ 08:45 AM | 3,455 Views
My "new" DG-1000 (FlyFly I think) was given to me in a damaged condition. Tip stalling has caused some grief and crumbled the tail section and the winglets.

My aim was to reduce the weight and rebuild tail and wing tips. The original winglets weigh 40g each. Mine weigh only 12g each.
I re-built the vertical tail from scratch, very light from Depron and plywood.
(I "invented" a sandwich method. Grey 6mm soft Depron layers with ply and CF support inside and a skin of white 3mm Depron.)

Moved the elevator servo to the front to save tail weight and put plastic push-rods in for both elevator and rudder. A bit of a gamble but it works so far.

Replaced the winglets, made Depron ones, saving 56g. They are attached with 2x3mm CF rods each and Velcro.They are elastic and can be replaced if damaged, kind of a buffer to protect the wing tips.

Main spar is a hollow 6mm CF rod filled partly with 3.5mm steel rod.
The Turnigy 2836 motor delivers 340W max on a 9.5x8 prop.
I think I saved enough weight to make a difference.
AUW is 1440g with a 2.2AH battery, wing load 54g/sqdm.
COG is at 30mm as it is, no ballast needed, yippee!

On the maiden I noticed no tip stalling. The thrust surely is enough to pull her up at more than 45deg. She wants to go fast and for landing you need some space, as she keeps gliding forever! More tests to come. I love this plane!

Update: The elevator had too much play and I changed the setup. Now there is a small but strong blue arrow...Continue Reading
Posted by scarborofun | Mar 24, 2013 @ 10:19 AM | 3,363 Views
Yes, I connected the leftover Wings and the Fuselage of two crashed planes, and voila, I have a nice thermal floater. Though the wings started flattering heavily when coming out of inverted flight, obviously crashing the plane. But it's up and flying again. Just shows that the Radian wings can't handle much speed. Shouldn't have played around It also shows the durability of the molded fuselage of the Phoenix.

It's good to have a slower and a slightly hotter glider (Phoenix). Both can handle gusty days quite well though.

I must say that the Radian Pro is well over priced. The Phoenix has much better wings and control surfaces.

Posted by scarborofun | Feb 25, 2013 @ 03:42 AM | 3,236 Views
When I shot this video I didn't think that it was the last one done in my Phoenix 2000. A week later equipment failure destroyed this great plane.

I suspect the Spektrum DX6i but have no proof, except that 5 month ago a similar incident cost me my Radian Pro. Nosedive full power for no apparent reason and total loss of control. Distance only about 100m. Battery freshly charged. I can't and will not trust this transmitter again.

Why am I suspecting the transmitter? Because the first crash was with a Spektrum receiver and the second with an Orange, both with satellite. All parts fully functioning after the crash.

I have ordered an Orange transmitter now to replace the Spektrum. Will see what happens.

Update June 2013

The Orange transmitter was a failure. It had an intermittent fault and I had to whack it to recover! It is retired now. Besides, I had to remember the model numbers as it would not show the model names for selection.

I suspecting the Orange receivers are partly to blame. They work in DSM2 mode only and as such not quite as reliable as the Spektrum DSMX. You get what you pay for?

I still fly the Spektrum TX with only Spektrum RX while switching to FrSky, which is particularly nice with the telemetry in the gliders (altimeter!)

I do also suspect radio interference at our site though and ordered a 2.4 GHz band scanner to find out more. We'll see. So far I have lost 4 planes to unexplained crashes. None with the FrSky system yet but it's early days.

Here the last videoed flight:

Hobby King Phoenix 2000 Composite R/C Glider in Yokine (Perth), Australia (2 min 58 sec)

Posted by scarborofun | Jan 23, 2013 @ 08:12 PM | 3,695 Views
Flying my Wing (2 min 3 sec)

Posted by scarborofun | Jan 23, 2013 @ 07:53 PM | 3,959 Views