1/4 Scale Opel Rak 1

NEW 2021 VERSION!!

The Opel Rak is the World first rocket powered flying machine!

Here, it is reproduced at 1/4 scale.

The short kit includes all the parts shown on the plans (in 2 sheets included in the kit) that need to be cut. You will have to add the strip wood (spars etc) and sheeting.

The tail booms are made of aluminum tubes (not in kit!)- See material list below for more details.

Also included in the short kit, a handy model stand (see photos).

This new version of the shortkit includes more details, accurate parts (to say the least!!). Biggest change is the wing profile, now a HQ3.5/12 instead of the good old ClarkY!

So, pretty much the same as before, but better :)

Specs:

Wingspan: 2.3m

Overall Length: 1.2m

Weight: Around 2.5Kgs

Functions: Ailerons, Elevator, Rudder - Towhook (Optional)

Wing profile: HQ3.5/12

Build log:

Prototype!

Proto and Chat

Videos:

In Italy

Proto Flying - Slope

The Real one!

View of the plan:

I found another supplier for the Tube joiners:

Europe:

https://www.dutchflyingobjects-shop.nl/en_GB/a-7953048/connectors-stand-off-clips/avia-connector-12-12-mm/#description

https://www.metropolis-drachen.de/en/Kite-materials/Connectors/Leading-edge-connector/APA-strong.html

USA: 

http://www.awindofchange.com/product/goo-apa-connectors.html

https://goodwinds.com/product-category/catalog/connectors/edge-connector-apa/

If someone has STL file for 3D printing that would fit, happy to discuss! :)

Material needed:

Fuselage:

Pine or Balsa strips 6x6mm: about 1.5m

Sheeting: Balsa 2mm or 0.8mm plywood

10mm diameter Tow Hook (option, hole is made in C1 former)

Wings:

Spars are made of 10x5mm balsa/pine wood: about 6m

4mm Robart type Hinges: 8

10mm tube + inside rod for wing joiner (about 50cm)

6mm rod for incidence pin (about 5cm)

Sheeting in 2mm balsa, or 0.4mm balsa (prototype)

Covering

Control horns x2

LE is made of 10mm balsa sanded in shape

Elevator: 

4x4mm balsa (about 1m)

Robart Type hinges x4

Sheeting in 0.4mm plywood or light balsa

Control horn x1

10mm balsa strip for LE (about 48cm long)

Rudders:

4x4mm balsa (about 1m)

10mm balsa strip for LE (about 50cm)

Robart type hinges x4

Booms:

Top: 12mm diameter carbon or aluminum tubes x2

Bottom: 10mm diameter carbon or aluminum tubes x2

Couplers: see links above

And a course, a few bits and bobs!

All servos on the prototype were MG14 (mini servos, metal gears). 5 needed (+ standard servo for tow hook if fitted )

What's in the kit?