Monthly Archives: January 2021

Birth of the Inspiration Pattern ship “Inspiration 1”

This is the story of a model radio-controlled aircraft, which was designed and built from scratch, during the lockdown in South Africa in 2020. It was built by Alec McNamara, from Durban South Africa, who told his story to Aviation Central Durban reporter Trevor Viljoen.

History on the design and build of the INSPIRATION 1
At the beginning of the Covid-19 Pandemic Lockdown in South Africa on the 26th of March 2020, I was in the process of building and covering a 101” Big Stik. Around the 3rd of April 2020, I ran out of shrink cover and could not get any delivered as the shrink cover I use, is imported.

After two days of watching TV and being totally bored, I decided to clear my build table and take my roll of drawing paper and cut a piece at 2.5 meters. I then put a center line on the page and started drawing. I had the idea that I wanted to build a Patterns Ship. Over the next two and a half weeks I sat drawing, erasing and redrawing until I got a rough plan of what I wanted.
The following two weeks I just sat and fine-tuned the plan, taking into consideration I do not have a drawing program on my computer.

On the 7th of May 2020, I was required to return to work and with great excitement, I took the wood sizes that I had worked out with me and on my way home I stopped by the local wood shop (Timber City Pinetown) to purchase a sheet of the lightest 3.0mm commercial plywood they had and got it cut to size as they offer that service. They obliged with no hesitation and 30 minutes later I walked out with all my wood cut to the required size.

The Inspiration then started to develop.

All the cutting and shaping was done by hand using sanding blocks and a Dremel.
The canopy and cowl are made with moulded fibre glass and painted with 2K paint. The landing gear is made of a fibreglass inner with a double carbon outer layer. The Inspiration took all of Eight (8) months to develop into this flying giant.

After an extensive meeting with Jason Barker “The Durban Drone Guy”, an experienced Pattern and Advanced 3D Pilot, six (6) hours were spent going through the, almost ready, Inspiration. He advised on some changes that I should consider. I heeded his advice and made the changes accordingly.

The Inspiration 1…
On Sunday morning of the 6th of December 2020 at around 08:45 I loaded the Inspiration 1 in the car and my daughter and I headed for MMAC (Maritzburg Model Aircraft Club) where we met Jason. We went through the Inspiration 1 for the final time and did a second range check. I then did the Pre-Flight Inspection and got the Inspiration 1 ready for her maiden flight. We then found on taxiing that the landing gear was a little unstable. We made a bit of a jimmy by putting linked rubber bands on the landing gear to hold them in a suitable stable position for the maiden flight.
Only once Jason was satisfied with the makeshift repair would he take her into the air. Jason did some ground runs and we found that the spring from the rudder to the rear wheel was too soft and steering was a bit erratic. Once he saw that and we still had some form of control Jason lined the Inspiration 1 up for take-off, did some final checks, revved the motor to feel for unwanted vibration and was then ready for take-off.

At approximately 13:15, the INSPIRATION 1 was born as she left the ground on her maiden flight, piloted by Jason Barker. Oh My… What A Spectacular Sight She Was!
I give many, many thanks to Jason (the test pilot) for the time expended and all the advice given with getting this model to where she is today and for taking her through her paces on her maiden flight.

Specifications:
Wingspan – 1930 mm
Fuselage – 2100 mm
Wing Aspect Ratio – 5.68
Dry Weight – 8.1 kg

Motor – CRRC Pro 36cc
Propeller – 19 x 8 Falcon painted wood propeller
Motor cut off – RCEXL opto ignition kill switch
Ignition Battery – X-power 2100mah 2S1P Life battery
Ignition unit – RCEXL Ignition unit (Comes with Motor)

Electronics:
Receiver – AR8010T 8CH Air Telemetry with satellite receiver
Throttle servo – CYS S3006 – 6 kg (Plastic Gear)
Aileron Servo – 2 x CYS S0110 – 11 kg (Metal Geared)
Elevator servo – 2 x CYS S3006 – 6 kg (Plastic Gear)
Rudder servo – CYS S0150 – 15 kg (Metal Geared)
Receiver batteries – 2 x X-power 2100mah 2S1P Life battery

Alec McNamara

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