THUNDER TIGER E325 Mini Titan ARF Assembly Instructions Manual page 5

pinion is also provided if you plan on using a 2s battery. The instructions don't mention it but I used
a drop of the green locktite on the shaft and then installed the pinion. I also appreciated the motor
mount to pinion measurement, this allows you to install and tighten the pinion prior to installing the
motor in the frames. When you bolt the motor mount in place, all you have to do is set the gear lash.
This ensures that he pinion to main gear height alignment will be correct.
Motor and motor mount Pinion puller is useful to have Possible wire interference
Setting the proper gear lash is important so take a few minutes and do it correctly. The best way I
have found is to turn the main gear slowly until you find the tightest spot, which is where you want to
set the backlash. Set the mesh so that the main gear turns easily but so that you can't feel a lot of
slop between the gears. Take a strip of standard printer or notebook paper and cut a ¼ inch strip
about three inches long. Feed the paper between the pinion and the main gear and examine it when
it comes out the other side. If the paper is mangled it's too tight. If the paper is wavy the mesh
needs to be closer. The paper should come out looking like an accordion with sharp edges. Tighten
the screws fully and recheck with another strip of paper.
If the gear lash is too loose you run the risk of stripping the teeth from the main gear. If the gear
lash is too tight then you are robbing power from the rotor system and making your battery, ESC,
and motor work harder than they need to. This will result in over heating and possibly damaging
expensive components.
Install the servos as shown. I looked in the remaining hardware and couldn't find 6 identical self
tapping screws and the step in the manual didn't indicate any so I figured I was on my own for
mounting screws. The screws that come with the HS56HB servos I was using were too small to
capture the holes in the frame. Looking in my parts bin I found a set of hex head 8mm long self
tapping screws that were thicker than the Hitec screws. These turned out to be from a Trex 450 and
are available from AmainHobbies http://www.amainhobbies.com/product_info.php/cPath/2_375_376/products_id/9266
http://www.amainhobbies.com/product_info.php/cPath/2_375_376/products_id/9266 or you can find
something else suitable. The Trex screws fit perfectly though.
You are also on your own to find mounting screws for the tail rotor servo. The kit includes counter
sunk screws for the servo balls but no nuts. The 9650 servo horn holes are too big for the provided
screws to thread into. The balls are smaller than other kits as are the screws so I didn't have any
nuts small enough to fit the screws. Making matters worse there was only a thread or two sticking
out to thread something on to. I thought about replacing the ball and ball end with something larger
but the diameter of the tail rotor push rod was too small for any of the ball links in my parts bin.
After a bit of head scratching I made a nut plate out of a cut off Hitec servo arm. Then I used a
Dremel and a flat grinding bit and milled down the thickness of the servo wheel to about half its
original thickness. This finally worked but greatly increased the total time for what otherwise would
have been a fairly quick assembly. If I had elected to use a smaller servo this probably would not
have been a problem.
Solution to servo arm
Unique motor mount Cyclic servo installation
quandry