Mixture control

I decided to have a mixture control in my Sombrero.
It helps a lot when you can fine tune the engine in the air. You may also be able to skip a landing from time to time with this setup.
However the biggest motivation for me was to be able to control mixtue in the mid range, too. Today's F3A program is relatively demanding
and most of the time you will fly with left stick (Mode 2, you see) somewehere in the middle. Good transition is a must !

The mixture control is easy to do yourself. All you need is 10 mm nylon (poly amide) bar and 1.5 mm aluminum sheet.
The nylon bar is bored with 7 mm drill and a lever is made of aluminum, see pictures below..

 

Click to see a larger picture Parts ready for assembly. This needle is from OS 1.40 RX. The original rachet spring is removed.
Original needle and sleeve are used
The smaller nylon ring is needed to hold the misture control arm in place.
Click to see a larger picture Needle assy ready to be bolted on the engine. 2 grams weight added ;-).
Click to see a larger picture This mixture control system fits almost any OS engine. This time on 91 FX.
Because there is suitable friction between the nylon sleeve and needle racheted surface it is easy to adjust the
needle manually just like with the original rachet spring. The friction is set to be so small that servo is not affected.
Click to see a larger picture Another mixture control lever fitted on OS 1.40 RX.
It is possible to adjust the needle +/- 5 clicks.
If the range seems to be small I can always use a needle with steeper angle (supplied with the engine).
No hole needed in the fuselage.