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12-22-2018 02:59 PM  18 months ago
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D-Bos

rrNewbie

Murfreesboro ,Tennessee ,USA

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Flybar conversion
Hi, I wish to convert my Raptor50 to flybarless,How & what do I need to change my Name original ( if possible)
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12-22-2018 03:16 PM  18 months ago
Flyin for Jesus

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Troy, IL. 62294

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You can get a flybarless head, might need servos ( depending on your current servo's speed and torque ) then a FBL gyro of your picking.

I have done a cheap FBL conversion on one of my old helis where I removed the flybar and locked the see-saw part. But you cannot simply remove the flybar and go straight from the swashplate to the main grips as your geometry will be off giving you something like +/- 25 degrees of pitch.
If you decide to go that way, let me know and I'll show you how I did it.
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12-22-2018 03:45 PM  18 months ago
D-Bos

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Murfreesboro ,Tennessee ,USA

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Thank you Flying for Jesus, I wanted to use my parts but; OK, I’ll find a head. Thanks again
D-Bos
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12-22-2018 04:16 PM  18 months ago
Flyin for Jesus

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Troy, IL. 62294

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You can use what you have, to keep it on the cheap.
No matter what, you'll still need a FBL gyro and maybe a little bit of creativity.
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12-21-2019 10:03 PM  6 months ago
kamlooper

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kamloops

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If your still around, Id like to know how you did this conversion, thanks
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01-06-2020 08:26 PM  5 months ago
Rojoalfa

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Punta de Mata, Monagas-Venezuela

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/
/

We are talking about cheap conversion for raptor rotor head...ok... Watch it!

Look at this Pics.
First of all, you cut the upper head, removing seesaw and flybar mechanism.

Look for two pipe bolts and an additional washout and install according to Pic. You need to remove the two post underneath the rotor and screw the two bolts.

Glue it if you want.

Ready to setup and flying...
You need a FBL gyro but you can fly this "Frankenstein" without it.

This Pic was send to me for one of my friends, doing this jobs while boring in winter...

Raptor mechanisms and dimensions are full of surprises...

/
Saludos cordiales,
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01-06-2020 09:20 PM  5 months ago
spacecopter

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Calgary, CANADA

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@ Rojoalfa

I like your pictures
No sponsoring - I pay for what I fly
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01-07-2020 03:41 AM  5 months ago
Flyin for Jesus

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Troy, IL. 62294

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@ Rojoalfa that is not the right way to convert a FB head to FBL. Removing the see-saw arms and just going straight to the bladegrips does not work. Doesn't work well at least.
If you do that, without changing anything else, you have a heli doing say +/- 10 degrees pitch now does +/- 25 degrees pitch. You can change the servo travel to like 30% but you have terrible resolution. If you move all the balls on the servo arms in a hole, that helps so you don't lose resolution in the servo but now that the swash tilts so little, you lose resolution there very quickly with even the slightest slop. Not to count that you have tripled the torque on the swash to bladegrip links.
The right way to convert it without messing up anything mechanically is to leave all the original components and simply lock the flybar rigid. That way, all your servo travels, all the geometry is the same as the original design.

Let me see if I can figure out how to post a couple of pics... hold on.
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01-07-2020 03:59 AM  5 months ago
Flyin for Jesus

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Troy, IL. 62294

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This photo is of a FBL head, notice how far out the balls in the bladegrips are sticking out from the center of the head.

This photo is of my converted FB head. If I were to remove the see saw arms and put a ball on the bladegrips, notice how close to the center of the head they would be. They would barely stick out past the head button.

This photo shows all the components are still on the head, the flybar center part is locked in place and cannot move ( forgot what that center part is called ) By locking this part, then you get no input from the flybar to the blades. So I cut off the flybar out of both sides.

In this pic, I drilled and tapped holes in the flybar center part, then adjusted them to lock that center part level and solid. Now all I had to do was add my FBL controller and set it up. All servo travels were within spec, same with 8 degrees cyclic setting ( Vbar )

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01-07-2020 12:21 PM  5 months ago
Rojoalfa

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Punta de Mata, Monagas-Venezuela

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Take it easy my folks!

Remember, I was talking about cheap conversion.

We know that if you want to do a good conversion, it is not as simple as that.

/
Saludos cordiales,
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01-07-2020 03:22 PM  5 months ago
Flyin for Jesus

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Troy, IL. 62294

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I was trying to word my reply to be as easy as I could... just wanted to point out problems with just moving the links. Convert it like that, it might not fly that great and be hard to tune since servo movements get amplified. ( sorry, I am very math and geometry brained )
And, of coarse, I want everyone to have the best flying heli they can.
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01-07-2020 06:44 PM  5 months ago
JuanRodriguez

rrProfessor

The Villages, Florida

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💎Sustaining Member
I’m with you FFJ

I would never recommend doing a half assed conversion when it could potentially become a safety hazard.....

To the OP , do it right or not at all .....
Been there, done that and old enough to know better.....
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01-07-2020 06:54 PM  5 months ago
Rojoalfa

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Punta de Mata, Monagas-Venezuela

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Yes, I agreed with your explanations. I am an "low average" pilot but I considered myself a good mechanics and very good on math also.

This "angular phasing" on flybarless configurations are very serious issues.
Non-linear behavior on mechanism movement...

But, if we are talking about cheap conversion, this mod is the best for raptor.

Of course, you may not do 3D with this Frankenstein...

BTW, if we change grips on "this idea" using mikado logo 600, probably main links should be on 90 degrees... Less stress... Better behavior...

/
Saludos cordiales,
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