Build/Review: HeliArtist 450 Size MBB BO-105
What's in the box:
*Fiber Glass scale fuselage x 1
*Pellucid canopy cover x 1
*Horizontal stabilizer x 2
*Upper Tail Assembly Set x 1
*Belt x 1
*Landing Gear Set x 1 Pack
*Frame Stand Wood x 1 Pack
*Screw Pack x 1
Tinted top windows.
Note: No side windows are included in this kit.
Aluminum Struts and Skids with plastic T joint.
Fiberglass Horizontal fins and plastic Vertical fins.
Factory installed exhaust pipes.
Elevated tail cover, with pre-cut tail rotor opening.
Elevated tail conversion assembly.
Factory installed wooden base.
For this build I will be using the HK-450 Helicopter Kit.
HK-450 Helicopter kit,
HXT900 9G servos x 4,
Turnigy 2836 Brushless 3700kv Motor,
Turnigy Plush 40A ESC,
JR G7703D Gyro (I had an extra one laying around).
Landing Gear Assembly:
The bottom of the fuselage is pre-drilled for the landing gear struts.
The struts are routed through the fuselage and are mounted to the wooden base with self tap screws.
To reinforce the strut install, I applied some Epoxy.
The struts and skids can be attached to the "T' connector, using CA, epoxy or screws.
For the most secure assembly, I recommend and used the screw method.
The front window is factory installed.
The top windows will first need to be trimmed.
Note: Be sure to leave about a 4-8mm edge around the window.
Rubber cement or shoe goop are a good choice for mounting the windows to the fuselage.
Elevated Tail Conversion:
Note: The first release UH-1 and BO-105 kits have a plastic smooth guide pulley, riding the belt teeth. It has been discovered that the plastic guide pulley will become rapidly worn and fail, which could result in tail rotor failure! Please see post for DIY modification: http://www.rcgroups.com/forums/showthread.php?t=1165117
The elevated tail conversion should be installed on the helicopter, setup and test flown before installing into the fuselage.
Remove the tail rotor assembly, from the helicopter, and install onto the elevated assembly.
Included in the kit is a semi-flexible servo rod and a plastic tube.
Insert the servo rod into the plastic tube and secure it to the tail boom with tie wraps.
Note: Do not over tighten the tie wraps
Note: The helicopter frame will not fit into the fuselage with this size of gyro mounted as shown. After the setup and test flight was completed, I moved the gyro to the front of the helicopter frame.
Installing the Fuselage Mounting Hardware:
Attach the short length wood piece to the Heli frame front landing skid mount.
Glue the longer wood piece onto the installed short wood piece.
Note: The longer wood piece has a screw hole on each end.
Three wood pieces, two short and one long, will be attached to the rear landing skid mount.
Glue the three wood pieces together, stacked as shown.
Note: It is important that the wood piece stack is aligned and centered!
Attach the wood piece assembly to the rear landing gear mount using the self tap screw.
Note: Check centering of the wood piece stack while securing the screws. The rear stack will slide into a quick-lok system in the rear of the fuselage base.
Helicopter frame with mounting hardware attached.
Install The Helicopter Into The Fuselage:
Here, I use a different method than what is called out in the manual.
Remove the Tail Rotor assembly and the elevated tail boom.
Partially disassemble the elevated conversion assembly, so that the assembly can be flattened, to fit into the fuselage.
Insert the Helicopter into the Fuselage, as far back as possible without over forcing. Be sure that the rear mount is engaged in the quick lock rails.
Reassemble the elevated conversion assembly
Reassemble the Tail Rotor assembly
Assemble the stabilizer fins and glue onto the fuselage.
Note: Slowly and gently turn the screws, when assembling the vertical and horizontal fins, to prevent cracking the fiber glass.
Tip: Use gap filling CA to attach fins to fuselage.
1. Apply CA to fuselage stabilizer fin mount hole.
2. Insert fin and wiggle a little to get CA coverage all around fin.
3. Hand hold fin in the proper aligned position.
4. Spray on CA accelerator.
Reinstall the tail servo rod.
Install the tail rotor cover.
Secure the Heli by installing the screws into the front mount
Flight Test and Final Notes
Assembly of the BO-105 Fuselage Kit was fairly easy. It can be completed and in the air in just a few hours.
No modifications to the fuselage were required to install the HK-450 (Hobby King T-Rex 450 clone) into the fuselage.
On a scale note, the cabin section appears a little too long, but overall it is a fantastic looking model.
Note: Be aware that due to mounting method, helicopter kits of the same class that have a different landing gear layout, some creative thinking may be required to install a non-Trex clone.
During the build, I did note some possible problems.
I have notified HeliArtist with my observations and they are working on the fix.
1. The base structure could use stronger glue in some locations.
2. The quick-lok rails could be better reinforced to prevent separation.
For security, I installed some tie wraps to prevent any possible separation of the Heli from the fuselage.
During my flight test I did notice a little bit of tail wag, when hovering and flying slow circuits. However, during cruising and fast forward flight the wag was not noticeable.
I believe that the servo rod may be a little too stiff.
I replaced the stock servo rod with Sullivan #515 Gold-n-Rod 2-56 size semi-flexible cable, and resolved the wagging.
It's not separate. But the elevated tail is separate, which allows you to set up
and pre-flight before installing into fuselage.
HK-450 helicopter kit
HXT900 9G servos x 4
Turnigy 2836 Brushless 3700kv Motor
Turnigy Plush 40A ESC
Jr G7703D Gyro
Zippy 3S 2200mah 20C
BT, mabey you could reduce the rpms and increase the pitch and it should extend your flight times on those packs. I think my Blackhawk is one of my heaviest fuselages at 307 grams and Im using same battery, 35 amp esc and stocky ESKY belt cp motor and Im getting about 8-9 minutes of flying but Im also running a low headspeed. As a matter of fact I fly it idle up off. Put battery on charger and voltage reads 10.8-11.1 volts before recharge. I dont get to aerobatic or aggressive with my Blackhawk but some of the others I do but they arent as heavy as the Blackhawk but the flight times remain about the same if not a little longer. It will be interesting to see what your flight times would go to if you flew idle up off. Comming from old school, idle up at one time was considered for 3D and inverted flight. I think as you get into the bigger and heavier scale models, its not a necessary as in the case of 3D and inverted flying. Very rarely I go Idle up on flying scales. I dont really see the need. No other way I can really explain my longer flight times on my heavier scales.
They replied that they are concerned that some people may not know how to cut it and will crack the fuselage.
Maybe if all of you send HeliArtist an e-mail, for this request, it will get done.
Don't know if and when the elevated tail conversion assembly will be sold in the spare parts.
Yes the BO-105 uses the stock full length tail boom.
I am using 12T pinion on the 3700KV motor. I prefer power and performance over flight time. Head speed is around 2800-2900. Flight time 4 minutes.
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