Kavan Cumul 100 (Kit)

Kit of a high-performance thermal glider (or motor glider) with a wingspan of 2540 mm for 300-450W AC electric motor drive. Very light classic all-balsa construction from CNC carved parts, hull with laminate nacelle and carbon tail spar. Controlled ailerons, flaps, rudder and elevator. The kit contains fuselage parts for both the glider and electrolet versions.

The old gliders used to say that a proper model starts at a span of two and a half meters or 100 inches...With the Cumulum 100 you can easily see that they were absolutely right! A powerful thermal glider is one of the most rewarding machines in the recreational modeler's hangar - nothing compares to peaceful relaxing flights in mild conditions, circling in thermals under the clouds, quietly gliding in the calm of the early evening when you can sit back and watch your elegant model fly almost by itself ...

But the Cumul 100 can do much more - thanks to the fully mechanized wing with ailerons and flaps, you can thoroughly mess around with its setup and fully utilize the capabilities of your computerized RC kit. Flight modes to increase penetration when searching for thermals or to increase buoyancy when circling in an updraft, an amazingly effective butterfly brake for landing "on a fiver" - these are just a few options to really enjoy flying with the Cumulum 100. And if you have a competitive spirit in you, the Cumul 100 complies with the rules of the international FAI F5J category or the national RCEP/RCEN/RCEV classes.

The Cumul 100 is an ideal project for modellers who want to build a really powerful model for both recreational and competitive flying. Thanks to a well-thought-out design with CNC-carved parts equipped with protrusions and notches that fit together like pieces of a jigsaw puzzle, construction is very quick and easy.

With the Cumulum 100, you won't get lost in F5J competitions or in various "enduro" classes. The kit contains fuselage parts for a pure glider and an electrolet. The Cumul 100 is still a relatively simple model, but it is not intended for beginners.

The front part of the fuselage consists of a laminate nacelle with a removable cover for perfect access to the rudder and elevator servos stored in the plywood bed, receiver and possibly engine, regulator and drive accumulator.

For easy modification of the nacelle for the installation of the electric motor, the kit also includes a plywood tool for cutting off the tip of the fuselage. The tail section of the fuselage is a carbon tube spar with a glued-on pylon with a balsa-clad light plywood core to secure the horizontal tail. The kit also includes an adjustable tow hook.

The three-part wing with the AG 40-42 profile is a classic design with balsa ribs and a rigid torsion box cover. The main beam consists of flanges made of spruce slats with a balsa web, which guarantees high frame strength at a very low weight.

The ears with elegant winglets connect to the centerplane with carbon connectors and duralumin spacer pins. Flaps and ailerons are controlled independently by four servos using short wire rods. The wing is attached to the fuselage with two plastic screws.

The tail surfaces are board, glued from CNC carved balsa parts. For easy transport, the horizontal tail surface is removable, fixed with 2 plastic screws. The rudders are controlled by wire ropes.

You can cover the model with an iron-on film (e.g. Kavan or Oracover transparent film for purely recreational flying. If you are building a competition machine, the lighter Oralight film or similar materials are preferable.

You will need at least a seven-channel RC set to control the model. For recreational flying, a good 15-20g microservo with metal gears and a thrust of at least 2.5 kg/cm will do. For sports and competition flying, you should not hesitate to install strong and fast micro servos, such as Kavan GO-1023MG for ailerons and flaps and Kavan GO-1020MG/GO-1021MG for rudder and elevator (the beds supplied in the kit are "tailor-made" for these servos).

A LiPo dual cell with a capacity of 800-1000 mAh is ideal for powering the on-board electronics of a competition glider.

To drive the electric version, you will need a 300-450 W AC electric motor with a diameter of 28 mm. Our prototypes fly with Kavan C2836-1120 and Kavan PRO 2836-1050 engines with a 10×6" propeller with a 32mm propeller cone and Kavan R-40SB Plus or Kavan PRO-40SB controllers powered by 3S LiPo batteries 11.1V 750-850 mAh with a load capacity of at least 30C for recreational and 40C for competitive flying.

Package contents

The package contains CNC carved balsa and plywood parts, spars and hardboard balsa boards, laminate fuselage nacelle, carbon tube tail spar, accessory kit, sheet of self-adhesive decals, 1:1 scale construction plan and instructions.