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HomeAircraftHelicopterBergen R/C Helicopters › flybar head question
10-30-2013 05:51 AM  5 years agoPost 1
geomecc

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Long Island ,NY

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where can I find info on programming this head for fai type flying?

R I P Roman Jr. Team SKOOKUM SRW EFC

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10-30-2013 03:52 PM  5 years agoPost 2
Chris Bergen

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cassopolis, MI USA

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Scroll down to the bottom of this page...

http://www.w3mh.co.uk/articles/articles.htm

These are articles written by Colin S. Mills of CSM fame, about helicopter theory and aerodynamics. It may provide some insight as to what you are trying to achieve.

Chris D. Bergen

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10-30-2013 05:57 PM  5 years agoPost 3
Santiago P

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South West, Ohio

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May I highly suggest a set of Funtec or KSJ paddles, along with a set of heavy 720mm Rotortecs.
The pair make 90% of a FAI heli setup. The rest is the flybar ratio, about .75 (and headspeed), if you can get that out of the Bergen head.

That is assuming you have about a 490-500mm flybar.

1475 to 1600RPM for hover and 1900 to 2000 for aerobatics.

Santiago

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10-30-2013 07:25 PM  5 years agoPost 4
geomecc

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Long Island ,NY

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yes that's about right. there are different holes on the flybar carrier, main grip and main grip bell crank. I wanted to know what ratios to each hole does?

R I P Roman Jr. Team SKOOKUM SRW EFC

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10-30-2013 09:07 PM  5 years agoPost 5
Santiago P

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South West, Ohio

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I dont have a Bergen head near me, but

you can measure the existing one on yours by holding your collective at zero, putting a digital gage on the flybar wire, tilt about 5 degrees, and then measure the degrees on the blade. The ratio of the blade to the flybar is the ratio I was refering. (some use the number backwards, FB/blade)

About .68 to .75 works ok with a 500mm flybar.
If the flybar is longer, you can use a lower ratio like .5

The FAI paddles are a must. Some folks also add sliding weights to fine tune.

The goal is to have a ratio that will hold during most wind conditions.

If the ratio is too high, the Heli will chase into the wind.
If too low, you will get blown downwind.

Yo will also feel a bit of 90 degree shift trim with the wind, some helis/heads do it more than others and is normal. You learned how to fly that offset. (heli in front, wind right to left, rotor will drift away. wind left to right, rotor will drift towards you)

If hovering manuevers require pirouetting, you don't trim, you learn how to stear that cyclic but if all hovering is done tail in, you could trim for the hover. Just don't carry the trim upstairs for aeros.

S

Team Minicopter - PeakAircraft.com
bavarianDEMON- Team Kontronik - Scorpion Motors-

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10-30-2013 09:26 PM  5 years agoPost 6
geomecc

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Long Island ,NY

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wow. thank you money pit.

R I P Roman Jr. Team SKOOKUM SRW EFC

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10-31-2013 04:53 PM  5 years agoPost 7
Chris Bergen

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cassopolis, MI USA

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Just as in 3D flying, talking to different Pilots will yield different recommendations.

Not saying Santiago's suggestions aren't valid, but they are just one opinion.

If you read the articles written by Colin, as well as others, you gain an insight to the theories then you can experiment to get the feel that you want for your bird and your flying style.

Chris D. Bergen

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10-31-2013 11:45 PM  5 years agoPost 8
geomecc

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Long Island ,NY

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thanks guys

R I P Roman Jr. Team SKOOKUM SRW EFC

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