Tail assembly

Here's the complete details on how to assemble the tail assembly. I'll try to include all the nasty little details that Blade forgot to mention, along with some tips on how to make it fairly easy.

The tail assembly is pretty straight forward. It has a tail boom with a belt running through it connected to the tail shaft which spins the tail blade. The tail blades are on a shaft and they get angled from the pitch lever and control slider set. It is moved back and forth with the tail servo which is mounted close to the frame to keep center of gravity near the main shaft.

Here's a video on how to do it from Blade. It is missing a lot of information though.


The first thing you'll want to assemble is the tail shaft and grips.

The tail grips are made of plastic. The parts manual is wrong as there's wrong part numbers and missing items from it. Here's how i put it together.

Start by putting a bearing in the bottom of the blade grips (EFLH1115, 3x6x2.5mm). The part number in the manual is wrong on this one. Then land the grip on the bearing you just put in (tail blade pointed up if there was one installed). Then we'll put everything inside the grip in order. Next is these:

- brass insert (from BLH1670)
- bearing (EFLH1115)
- 2x shim (from BLH1670)
- tail rotor thrust bearing part 1 (the one with the bigger hole. flat side towards bottom, grooved side to top)
- balls assembly
- thrust bearing part 2 (smaller hole, with grooves to bottom, flat to top)
- washer with extension that fits on the bolt
- bolt (Please put some threadlocker on this and do not over tighten, but make it tight)

repeat this process for the other blade grip.

As it is pointing up, lift it, take the rotor hub (#56 below, BLH1669) and insert it in the grip, in the bearing. With a 1.5mm hex tool, gently tighten the screw all the way. An easy way to hold the hub as you tighten is to insert the tail rotor shaft in it and use it to tighten the screw. Once tight, insert in the other grip same way and tighten. There should be very little play if you take both grips (one in each hand) and try to pull them apart. If there's more than say 0.5mm play, you didn't put something right, and you should start over. take the one that's wrong, and redo it. Once both grips are tight with not too much play, make sure they rotate freely with no binding. Then put a blade in it. The leading edge of the blade is on the same side as the ball connection of the tail grips. (See picture below) If using the KBDD blade, no shims are required. If using the stocks, 1 shim is required on 1 side of the blade (ideally on the nut side, not on the bolt side (just to keep stuff organized). The shim goes on the blade, then insert it in the blade grip. Put some thread lock on the bolt then insert it, and put the nut on the other side. Make them tight enough that the blade hold itself when put sideways, but it's not hard to move it. If you're using the kbdd blades, they are pretty tight. I recommend making sure that the nut has enough thread to hold. you can now install the tail grips balls in the holes at the bottom of the grips. Get them tight, but don't over tighten them. Put the locking screw in the hub just screwed a little so it won't fall out, but the shaft can freely go through it.

Here's a picture of the assembly.

Next is the tail boom. The end that has a groove and a long hole is the part going in the frame. Looking at the frame from behind, the groove goes on the left side. I will assume that you have the belt installed. If not, refer to the frame assembly. I like to attach the boom to a long rod (a straight metal clothes hanger with bent 1cm tip will do) or simply attach a string to the belt and feed it through the tail boom, then slide the boom into place. You might have to twist the boom to insert it in the groove. Once it's in, pull on the rod / string to pull the belt out and push the boom all the way in. You need to install the 2x servo mounts so the flat part is on the right side looking from behind (do yourself a favor and get the aluminum version BLH1658A). Insert the larger tail servo pushrod, then the smaller one. Looking inside the boom, you should straighten the belt (pull on it, and look at the gear at the end). Once straight, looking at the frame from behind, twist it 90 degrees clockwise.

Now the tail case. The plastic case does the job pretty well, but the aluminum case will hold together better in crashes. I will cover the plastic one here. For details on the aluminum version, check the upgrades section.

Take the case part that has no arm setup, put a bearing in it (BLH1605) and insert it on the boom from the left side. Put the cage so it clips in the tail boom's hole. Now take the tail shaft and make sure that there is a black plastic spacer on the side of the pulley (one is snug, one is removable). Insert the shorter side of the shaft in the belt, then in the bearing in the cage. Install a bearing (BLH1605) in the other half of the case. Also install a bearing in the bottom of the slider control fixation on the cage, then put a brass spacer, then put a bearing on top. Then put a washer with extension on the bottom and on top (in the bearings) then slide the control slider on the cage, so that the arm will be below the tail case once installed. Put the bolt through it and secure. Insert the tail case over the belt and make sure it fits in the hole in the boom. Once tight, secure it with the 3 small silver screws. The long black screw are used for the tail fin, which you can put on at this point. After the case is secure, insert the tail slider onto the tail shaft, and make sure it gets inserted inside the control "pins" (one on top, one on bottom). The slider should have it's arms facing away from the boom. Turn the shaft to see the notch in it, make it face up. Take the tail blade assembly and insert it on the shaft with the hub screw facing up. make sure that the tail blades are in the proper direction so that the one closer to the frame should have it's thicker side facing up (looking from right, to spin counter clockwise). remove the set screw and put a touch of thread lock on it. Put it back in and make sure it's in the notch of the tail shaft. before tightening, make sure the shaft is equal with the hub, then tighten. Insert the links from the slider on the blade grips. Now you need to install the tail brace / support. insert the black plastic underneath the boom, and place it between the tail servo pushrod. Install the tail stabilizer on top, and put the screws in it without tightening them. Screw the end of the braces on the main frame. Install your servo on the servo mount. Looking from the left, install the servo so the the sticker is more to the rear (See picture below). Attach the pushrod to the servo. Install the ball on the tail control slider arm and install the pushrod in it.

tailservoinstall alutailcageplastictailassembly

Next you want to put the tension on the belt. It is fairly easy. Tighten the screws on the frame securing the tail boom just enough so that you can move the boom with some efforts. Simply slide the boom out to put tension on the belt until you can bend about 1/4 of the way in the hole on the cage. Don't make it too tight, nor too loose! Once at the desired spot, secure the 4 screws all the way in the frame. Make sure they are tight as if they let go of the boom, it will slide and you'll loose tail control.

you can now tighten the screws on the tail stabilizer and place the servo pushrod holders spread out and insert the pushrod itself in them. Before locking the tail servo mounts in their spot, make sure the servo is at 50% travel, and make sure the tail slider is at 50% of it's travel. If the slider is not centered, move the servo mount to make it centered. Lock the screws on the servo mounts, then lock the screws on the pushrod holders.

Plug the servo in the receiver and you should be all set!


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