Specifications

screw into both holes of the hub to clean up the threads before inserting the M2x8 bolts

(E058).

Step 3 - Rotor Head Assembly:

At this point you will have six bearings: four 2x6x2.5 and two 2x6x2. Be sure to use the

2x6x2.5 for the main blade grips! The bearings look very similar!

Step 4 - Rotor Head Assembly:

Squirt some powdered graphite through the flybar hole in the stabilizer lever (E072) to re-

duce friction and allow the flybar to rotate smoothly.

Step 4 - Rotor Head Assembly:

Be sure to tighten the grub screw(E083) just enough so you can see a tiny gap between

the stabilizer lever (E072) and the stabilizer bed (E073) on both sides. This will ensure the

stabilizer lever pivots freely without rubbing against the stabilizer bed.

Step 5 - Rotor Head - Completion:

The ball link diagram labeled "2x" is incorrect. The diagram shows two short ball links con-

nected by a bolt. The ball link labeled E021 should be a LONG ball link, not a short ball

link.

Step 6 - Helicopter Construction:

There are two places in this step (4 and 14) where it calls the E419 the "Vertical Fin Hold-

er". This is incorrect. It should read "Horizontal Fin Holder". There is no vertical fin holder.

Step 6 - Helicopter Construction:

If you glue the vertical fin to the tail boom, it will be difficult to remove when replacing the

tail boom. I recommend drilling four 2mm holes in the vertical tail fin and using two nylon

tiewraps to secure the tail fin to the tail boom without using CA.

Step 7 - RC Installation:

I recommend putting a piece of 1/8" or 3mm plywood underneath the front servo mount to

give extra clearance to the servo arm. Additionally you should trim the same amount off

the ball link to compensate for the raised servo.

10.7. Specific tips for Ikarus ECO 8/16 only

If the ECO 8/16 is built strictly by the manual, you will create a helicopter which has extremely

tight linkages and will have severe vibration problems and will be difficult to hover. Please fol-

low these tips so your ECO 8/16 will fly well.

• It is possible make the ECO more durable and crash-resistant by "doubling up" the side-

frames. To do this, buy another set of sideframes, and epoxy each set together - don't for-

get to rough up the mating surfaces of the sideframes with 200 grit sandpaper first for bet-

ter epoxy adhesion. You will need to replace the M2x8 with M2x10 screws, and also re-

place the M2x30 screws with two extra-long M2 bolts or two M2 threaded rods because the

M2x30s will be too short to reach through the tail boom mounts. The double frames will add

about 41 grams to your AUW and reduce your flight times by about 30 seconds, but the

frame will be much stiffer for better control and also survive most crashes.

• The stock ECO 8 landing gear is a bit narrow and makes landing difficult for beginners. You

may want to replace it with the ECO 16 landing gear (67916 + 67917) or the ECO 8/16 ex-

tra wide landing gear (67822).

The ECO 16 landing gear is about 1 inch longer and two inches wider than the stock ECO

8 landing gear. This landing gear will need slight modifications to work on the ECO 8 be-

cause it is designed to hold two battery packs.

Helicopter Construction