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Home › ✈️Aircraft › 🚁Helicopter › Thunder Tiger › RAPTOR 90 › Flybarless Raptor 90 Arm Extensions? Who's interested?
09-14-2009 03:35 PM  11 years ago
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puma1824

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Maryland, USA

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Flybarless Raptor 90 Arm Extensions? Who's interested?
Anyone interested in replacement blade grip control arm for flybarless use? It would be like the one in the pic below BUT extended to help with servo resolution when converting to flybarless. There's been interest for Raptor 90 conversion locally which I'd like to help out. This could be a nice solution.

If there's enough interest I might be able to get them manufactured, so please reply if you're interested. Nothing to commit just post interest.

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09-14-2009 08:12 PM  11 years ago
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THX1138

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Indianapolis, IN

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I'd be interested in a set.

LouJust give me five dudes and two flashbangs...
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09-14-2009 10:49 PM  11 years ago
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jock0

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Berkshire UK

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+1
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09-14-2009 11:34 PM  11 years ago
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jsenicka

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Eagle River, WI

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The Elevated RC grips might make a better candidate. They are 14mm and you would not need to deal with the radial bearing in the process.
Since Elevated RC is Heliproz affiliated, they should respnd to new requirements quickly .Jim Senicka
Team Manager, GrandRC Flight Team
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09-15-2009 02:06 AM  11 years ago
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David Blain

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Mt. Dora, Florida (USA)

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I go +1 on jsenicka on this one...
The Elevated pieces are a much higher quality piece to make the modifications too.

The Raptor (Factory) parts can't compare in metal quality and most important overall strength!

Just my input from having first hand use of both pieces....David Blain
T.O.R.C.H.S. Orlando Member
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09-15-2009 03:19 AM  11 years ago
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50feet

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Wilmington, Delaware

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Why couldnt you just use the Gforce grip plates in the pic?
Or any grip for that mattter? Looking at my 90 the stock grip arms look pretty good?Youtube BigballVlogs
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09-15-2009 03:23 AM  11 years ago
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THX1138

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Indianapolis, IN

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The issue is not the quality of the grip, it is the geometry for FBL. The stock grip arms are not far enough out from the center line of the main mast and the standoffs are not long enough to center on the mast as well.

LouJust give me five dudes and two flashbangs...
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09-15-2009 03:32 AM  11 years ago
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puma1824

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Maryland, USA

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Why couldnt you just use the Gforce grip plates in the pic?

Or any grip for that mattter? Looking at my 90 the stock grip arms look pretty good?
Geometry is incorrect for a flybarless setup for the stock arm (or any for that matter). In a normal flybarred setup the use of bell cranks and mixing arms create the proper amount of throw for a given amount of servo movement. Removing the mixing arms introduce a high mechanical advantage. Servo resolution is then decreased if going with the stock control arm lengths. The goal is to have 10-12 degrees (no more no less, 11 would be best) pitch at 80 collective common on Vbar or other fbl systems (that's rougly 80 % servo throw). Furthermore, the balls are not centered with the mainshaft. In a flybarless setup we want zero delta.

Here's a link on flybarless Geometry:
http://vstabi.de/wiki/index.php?title=Basic_geometry

Check this out as well:
http://vstabi.de/wiki/index.php?tit..._of_other_helis
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09-15-2009 04:30 AM  11 years ago
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50feet

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Wilmington, Delaware

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If you move the arms out do you have to use a large swash to move the links out at the bottom to make the parallel to the main shaft?Youtube BigballVlogs
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09-15-2009 05:08 AM  11 years ago
0Post 10
puma1824

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Maryland, USA

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If you move the arms out do you have to use a large swash to move the links out at the bottom to make the parallel to the main shaft?
No. That would defeat the purpose. Increasing the distance on the blade grip while keeping the swash the same will decrease the amount of throw per given servo input, thus allowing us to have better resolution on the servo.

- Increase distance on blade grip = more servo resolution

example: at 80% servo throw have 12 degrees pitch...ideal

- Decrease distance and/or stock distance on blade grip = less servo resolution

example: at 80% servo throw have 18 degrees pitch, resulting in having to lower it to 60% servo throw to get the desired 12 degrees pitch.

*Examples are just estimates
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