The Dyke Delta was designed and built by John Dyke and first flew in 1966.

They do show up often at Airventure and SNF to help breakup the conformity of RV’s.

An excellent write up on the history of the aircraft can be found on the EAA web site, written by Alan White

https://www.eaa.org/eaa/eaa-chapters/chaptergram-articles/2016-07-the-rest-of-the-story-dyke-delta-n1aw

The structure is mostly 4130  welded steel tube

EAA Chapter 27 in Meriden Connecticut has a good collection of construction photos (including the photo above)

https://www.eaa27.org/index.php?p=planes&a=maher

For the RC community, legendary RC aircraft deisgner Laddie Mikulasko created a set of plans that can be found on Outerzone.

https://outerzone.co.uk/plan_details.asp?ID=6415

Quite the unusual aircraft and almost exclusively only found in Australia & New Zealand as an Ag Plane. It was manufactured by the Transavia Corporation from 1966 – 1993 with 118 examples built.

The common way anyone in the US or Europe would likely know about this aircraft is from 1985’s Mad Max Beyond Thunder Dome piloted by Jedediah (played by Bruce Spence). For the longest time I thought something this Bizarre was just made up with some real good special effects, but no its real.

Very interesting to see what people and companies will cook up when not bound by local technical Dogma.

https://en.wikipedia.org/wiki/Transavia_PL-12_Airtruk

RC models are very rare (nothing yet on Outerzone) but some custom one offs can be found, one of the few kits available is from Laser Design Services and can be found at:

http://store.laser-design-services.com/index.php?main_page=product_info&products_id=210