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Flybarless Rotor Head Systems > Off center balls
 
 
FrittsLogic
Senior Heliman
Location: Honolulu, Hawaii

I'm still new to the flybarless thing, but am going all in as fast as I can. My first two helis were easy as the blade grip balls lined up with the main mast centerline. My question to you veterans out there is this: has anyone left their blade grip balls off center and compensated for it by adjusting phasing mechanically or electronically? I'm getting ready to convert my Trex 500 where the stock blade grip ball locations are noticeably off center. I know I could search around for logo parts, or try to make something, but I started to wonder if any of that was really necessary. It seems to me that the stock flybarred heli used off center balls, so why shoudn't it work if I replace the mechanical Bell-Hiller force vector with an electronic mixed single pushrod from the swash. If I phase the electronics to the same value as the stock heli, it seems it should work. Has anyone tried this?

Menehune Rotorworks Inc.
04-08-2008 08:24 PM
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Super-Hornet
Veteran
Location: Singapore

I notice alot of people who chose to have its blade grip balls at the center of the hub (in line with main shaft) are mostly who use the flybarless to fly 3D stunts.

For me, which I use flybarless and multibladed is for scale purposes, I choose to have the blade grip balls NOT at the center. The reason is that by having blade grip balls not at the center, I will have the +ve/-ve delta offset.

So, I would say for you is to up to u to choose which one.

SH
04-09-2008 12:55 AM
 
 
FrittsLogic
Senior Heliman
Location: Honolulu, Hawaii

Can anyone remind me how the +ve/-ve delta offset affects our helis? I notice that some of my helis have had the grip ball very close to centerline in their stock flybarred form, while others, such as the trex's have them offset.

Menehune Rotorworks Inc.
04-09-2008 08:33 PM
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FrittsLogic
Senior Heliman
Location: Honolulu, Hawaii

Well I decided to use this spiffy new feature here on RR called "search" and it gave me everything I ever wanted to know. This link explains it well:

http://www.runryder.com/helicopter/t419026p1/

Cam UK explains it well

Bottom line is that I now believe that so long as you get your flybarless head phased properly, if you use the stock blade grip ball distances and orientations (leading edge/trailing edge) and emulate the stock heli's bell/hiller ratios in your electronics, the heli SHOULD fly with the same characteristics as in stock form. I will experiment with my Trex 500 and the sk360 to see if this is the case. It sure would make these conversions a lot simpler if we only had to find rod links long enough to go from swash to grip.

Menehune Rotorworks Inc.
04-09-2008 08:57 PM
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Flybarless Rotor Head Systems > Off center balls
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