| Features of the TechHead:
1. Made from super hard 7075 aluminum alloy.
2. The Feathering Shaft's O-ring cavity is deep enough to fully capture the O-rings and features a small bevel around the rim to protect the O-rings from being cut/damaged.
3. Very beefy cunstruction, especially in the base. This extra thickness in the base also makes removal of the main shaft retaining pin easy when the need arises.
4. The mixing of "Bell" and "Hiller" rotor head design gives the TechHead the "best of both worlds" and more. Meaning it turns out that "it is greater than the sum of it's parts".
5. The custom flybar angle gives the TechHead its' special "Self-Stabilizing" properties while the steerable flybar paddles allows for instant reaction to cyclic stick input.
Please note that the only difference between the 4#6 and the 4#3B/Q/CB100 TechHeads is the Main Shaft diameter, and the Main Shaft Retaining Pin diameter.
To convert to a TechHead, you need these parts from your stock 4#3B, 4#3Q, or CB100 head:
1x Main Shaft (and the Pin that holds it in the Head)
1x Flybar Pivot Block (little Gold Colored Aluminum piece the Flybar "pivots" in)
2x Brass Keeper Bushings (Holds the Flybar Pivot Block in place)
1x Flybar Control Ring (Black Plastic)
2x Flybar to Blade Grip Control Links (Black Plastic, Very Short)
2x Flybar Pitch Control Links (Go from the Swash to the Flybar Control Ring)
1x Flybar
2x Flybar Paddles
2x Main Blades (you can use 4#3Q Main Blades with a larger pinion for an even "wilder" flying experience!)
1x Feathering Shaft
2x O-rings/Dampeners
2x C-Clips/E-Clips (or Washers*)
2x Blade Grips ...4#3B (Red), or 4#3Q (Red or Blue), or CB100 (Clear)
In addition you will need the following components: 2x Mixing Arms...you can use the mixing arms from either the 4G3 (Red) , or 4G6 (Clear) , or CB100 (Blue**) 1x CB100 Linkage Set*If you'd like, you can substitute the C-Clips/E-Clips for Washers. You can find these washers in old 4#3B/4G3 Walkera Brushed Main and Tail Motors that have a 1mm shaft diameter. The Black Washers from the Brushed Main Motor(s) work best as you only need one on each side for a perfect fit. **To use CB100 Mixing Arms you have to move the "Balls" to the other side and use them 'backwards'.
About the GITechHead
By GITech
The GiTechHead… very different than any other FP heli experience!
The 54* Bell/Hiller TechHead is more like a CP heli in that the cyclic response is instant, very instant, and extreme if you want, but at the same time it has the "self-stabilizing" characteristics like the CB100, but different in that it will still let the heli attain high speeds, "bank" around turns, and let you pull out of trouble like the "death dive" for example...
Let's put it this way:
- 90* Hiller heads allow the heli to "move" fast and "bank" like a CP, but the response time is slow or lagging. This makes it so that you have to control the heli "before" you want it to react. So you can get them moving fast, but you had better have a plan for what you want to do next, or be able to see into the future just in case it does something you didn't "want" it to do as it takes a long time for the heli to actually follow your stick inputs. 90* Hiller heads also have very little in the way of "self-stabilization", and are usually known for having TBE.
- 45* Bell heads basically only have "self-stabilization", but let you "influence" that characteristic to make the heli move in particular direction. This can be seen by looking at the "flybar disk plain" during flight. As you give it cyclic input the the flybar disk plain stays level/horizontal and the heli itself "banks" or "pivots" in the direction of your cyclic input, but this is limited by the mechanical limits of its' "linkages" and "fixings". If the flybar disk plain is tilted from level/horizontal by getting it going too fast or getting it banking too much in a turn, it is difficult to get the heli to change from that direction. The flybar disk plain wants to stay at the current "angle" it is at...because you cannot "fly" the flybar...ie: control the flybar by changing the pitch of flybar paddles. This is the cause of the "death dive" for example. Cyclic reaction time is ok, but cyclic response is limited in "extent" by...the flybars' disk plain that "wants" to remain at it's "current" orientation, and the mechanical limits of the "linkages and fixings".
- The 54* Bell/Hiller TechHead is an evolution of the "Bell/Hiller mod" created by the need for faster cyclic response when 90* Hiller heads were the only head design around on micro heli's. This old "Bell/Hiller mod" created extreme CCW TBE though and I set out to correct this. By looking at the "Picoo-Z" I thought to give the offset flybar thing a try on my "Bell/Hiller modded" 4#3B. Eventually after R&D'ing many different "flybar offset" angles, the CCW TBE had been corrected. To my surprise this also gave it much greater "Self-Stabilization", even Faster Cyclic Response, which then turns out to translate into more Cyclic Extent within a given period of time!
Hence, why I have come to say that it is "greater than the sum of its parts"!
So, I believe the 54* Bell/Hiller TechHead is "capable" of any "flight mode" you could want out of an FP head heli.
I say "is capable of" because you "could" tone down the extreme capabilities of the TechHead to suit your desired "flight mode" by:
- If you only have a basic TX like the 2402, you could turn down the EXT (extent) on your RX, and what you would be left with is a heli that is good for "lower" speeds and winds, but is self-stabilizing, and has instant, though limited response to your cyclic inputs.
- If you have a programmable TX like the 2801, you could make your EXT high and add in EXPO so that you have a "soft" center stick, but still have full Cyclic Extent available to allow your heli to be more versatile.
- If you really want to see what the TechHead is capable of, like me, you could/can use no EXPO at all, turn your EXT up so far that you need to "link" or "tie" your control linkages together with sewing thread and CA to keep them from flying off in flight, use 4#3Q blades and an 18-20t pinion with an HP08 motor, or any combo that gives super high head speed capabilities! It's like it's on CRACK! I cannot recommend this at first though for those not use to fast CP helis!
And buy no means are these the only things that can be done as far as setup goes with the TechHead.
I think the TechHead can grow with its user, and can help its' user grow. It's still pushing my limits!
I am very excited...to see what everyone comes up with as far as setups, experiences and advices with their own TechHeads, as there's no way I have explored all it's "nooks and crannies"! |
