Saturday, 18 March 2017

DIY Wing incidence meter

Here is my simple home made wing incidence meter. Used to determine the correct mounting angle for wings.

There is much debate about the correct angle of incidence required for efficient flight but a good starting point is to have the horizontal stabiliser and wing both at zero angle, then adjustments can be made after flight tests.

A4 sized plans - download and print for your own use.

Video explaining how to use the Newton Incidence meter
(You can buy a proper one made by Robart)

Sunday, 22 January 2017

Eachine VR D2 FPV goggles

Banggood sent these goggles to me for review. I needed to add 2 x plus 4 close-up glasses before I could focus on the screen. I really like the diversity receiver with antennas supplies. One clover leaf and one patch antenna. And I love the built in DVR.

BANGGOOD purchase link

Here are the recorded video sizes with examples, and the review video with some flight footage.
(Images are not exact scaled sizes - limited by Blogger image display options)

4:3 camera - VGA recording 640 x 480 (4:3)

4:3 camera - D1 recording 720 x 480 (3:2)

4:3 camera - HD recording 1280 x 720 (16:9)

Mobius 16:9 camera - VGA recording 640 x 480 (4:3)

Mobius 16:9 camera - D1 recording 720 x 480 (3:2)

Mobius 16:9 camera - HD recording 1280 x 720 (16:9)

Review video on YouTube

Sunday, 18 December 2016

Turnigy 9X mode change

Here's how to change a Turnigy 9X V2 from Mode 1 (throttle on the right) to Mode 2 (throttle on the left)

Simple hardware tweak on the gimbals and software selections required.

Next job is to flash the firmware to OpenTX. A dodgy SmartieParts board has stalled that operation, waiting for a new one, stay tuned.

Sunday, 2 October 2016

Evolution of the X UAV One sloper

This is the story of my awesome X UAV One 1800mm wingspan V-Tail sloper. 
It was designed to be a pusher FPV cruiser with a unique prop drive mechanism that encircles the boom. However the boom prop gear box was way to noisy and caused vibrations. Bad for stealthy flying and onboard video.

This kit was sent to me by BANGGOOD for review.

While waiting for the motor to arrive I decided to try it as a sloper.
Actually I always intended to reconfigure it for sloping once the review was done.

The poorly designed gearbox really became apparent during my motor maiden flight.

Once that was out of the way it was time to try a tractor motor setup. 
Not so good for FPV with the prop in front of the camera, but a much better flight experience.

And finally as a pure sloper with slimmed down fuselage and longer nose, 
made from coreplast, hot glue and gaffer tape.

It is now a brilliant sloper that works in light wind, less than 10kn here, and will ballast up nicely for strong winds.

Boscam RX LCD5812 FPV screen review

This is a very nice 7" HD FPV screen with 40ch dual diversity receiver. Resolution 1024 x 600.
Removable sunshade folds down to protect the screen in transit.
AV in and out, HDMI in, USB port for firmware updates. External power port.
The only downside is that it doesn't have a built in DVR.

Watch on YouTube

GEARBEST purchase link

Friday, 17 June 2016

Mini Ranger Tundra morph

The Volantex Ranger 757-4 eventually flew OK but I was getting bored with it.

I decided to change the pusher into a tractor and make it as close to the Tundra STOL plane as possible, and thus the Vundra was born.

Now this is a fun plane, with enormous flaps and later addition of big wheels, I can see why the Hobby King Tundra is so popular

Here's how I cut up the mini Ranger and glued it back together as the Vundra.

STOL on the beach


Repair and landing gear how to

Sloping in lots of wind


Thursday, 9 June 2016

Volantex Ranger 757-4 review

...also called the mini Ranger. sent this plane to me for review. It's a 1.4m wingspan pusher style motor glider marketed as an FPV platform. It's ready to fly and includes transmitter, battery and charger.

Although the build quality and hardware are quite good, the flight performance out of the box is far from perfect.

High mounted pusher motors tend to push the nose down when power is applied. Some down thrust must be designed into the motor mount to counteract this, and there is not enough in this plane. The result is that the mini Ranger dives down under power and loops up when the throttle is cut, making it impossible to maintain level flight.

That's easy to fix. Just need to add 1.5mm thickness spacers under the bottom motor mount holes to angle the motor up a bit at the back.

Another major problem is the ineffective vertical stabiliser. The airflow over the rudder is blanketed by the big chunky fuselage causing bad adverse yaw. This means that the mini Ranger struggles to turn. When you use ailerons to bank into a turn the plane wants to head in the opposite direction. More rudder and power input is required to force it through a turn.

You need to use lots of rudder and aileron input all the time, or you can mix the rudder and aileron in the transmitter programming.

Here are build and maiden videos, as well as post maiden mods and adverse yaw explained.

I didn't enjoy flying this plane in it's original configuration so the next post will show how I converted it into a tractor motor, short takeoff bush plane, much like the HobbyKing Tundra.

Build video

Maiden flight

Post maiden mods

Adverse Yaw explained