My JR servos and OS engine arrived today. The JR servos have no instructions and the Boomerang user guide photographs are hard to see in B/W. It is well worth downloading the colour PDF version to zoom into the colour photos.
After a Google search I found out the brass collets are installed from the bottom up. This is not in the guide, however is important to stop the collet cutting into the balsa. This prevents extra vibration on the servo. The photo below clearly shows them fitted from the bottom up. I fitted the rubber grommets the wrong way round. I removed all my servos and turned them so the flat part is facing in.
Another tip found online was cutting the covering just in from the servo mount. This looks better, and prevents anything going into the balsa. Fitting the JR 539 was easy as it was a perfect fit without having to cut any part of the wing. The only extra cut was for the servo wire as shown in the guide.
The 5 minute epoxy set quickly, however I was unable to get the mount to make a perfectly flat bond. I did not want to exert too much pressure on the wing whilst it dried. It still looks good and will work fine.
Using the 1/16 drill bit worked well. I just made sure I did not drill too far into the wing. The screws pulled down without any fuss. I have not glued the servo into the mount as suggested by someone. I would like to get a second opinion on this. After reading RCMN, I have added the 2 drops of CA glue per hole after the screws have made a thread in the ply. The glue needed to set before putting the screws back in. I made sure the CA glue did not fill the hole with a paper clip.
Next was adding the pushrod wires. This seemed a bit confusing as they are so long, and you only use a small amount of the rod. The threaded side was easy to understand however the connectors provided are not the same as the guide. I am not 100% happy that these will be good enough as they look very weak. I had to drill the horn hole out to get the connector to fit. The tiny plastic pin looks very fragile. I may replace these before I fly my plane.
I had to remove the plastic connector from the aileron rods to connect the push rod connector. It was not easy getting the plastic pin in the hole, and it looked like it was going to break. After screwing the 2 connectors back onto the rod, I bent the tips of the rods to help screw them in. This worked fine.
The next step was cutting the rods and fitting them. I used a Dremel with a small metal disc to cut the rod. I think it may be best finding something that can cut the rods in future. The sparks may damage the wing if not careful. I still need to get some advice on finishing this servo installation. I will need to align the aileron and then ensure the connectors and horn are all setup correctly. I am sure this can be trimmed on the transmitter, however will make sure it is all correctly installed.
After looking at the colour version again, I see my installation was wrong. The plastic connectors used on the servo and push rods are different. You a ment to slide a small plastic ring over the side that the rod screws in. The other side should bend down into the servo horn. I will need to buy 2 new push rods and change this.
Till then
Sean
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