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e-BEAM Beam E4 > What am I overlooking?
 
 
MtnMac
Heliman
Location: Roseville, CA, USA

My Posts This: Topic  Forum		Just finishing up my Beam build. Every head link is exactly the length specified in the manual, down to 1/10 millimeter. All servo arms center at 90° and move equally both directions. Swash is dead level through its full range. It's a thing of beauty. Really. Problem is, at center stick I have at least 8° negative pitch, at top stick I have only 2° positive pitch, and at bottom stick it's like 30° negative. I can lengthen the linkages to adjust for this, but the discrepancy is so significant that I suspect I'm overlooking something. Any clue?

Skids
07-28-2009 07:33 PM
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Heli Bob
Veteran
Location: Puerto Rico,Carolina

My Posts This: Topic  Forum		Mtn

the only thing that i can think of is the radio set up (curve) on all the normal,stn1,stn2, are 0,25,50,75,100 for my pitch curve the curve that the manual said is good but dont recomend for my opinion.

Beam E4,scorpion 2221-6 11t,A123 battery,Scorpion 55amp ESC,Carbon blades
07-28-2009 07:40 PM
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MtnMac
Heliman
Location: Roseville, CA, USA

My Posts This: Topic  Forum		Thanks, Bob. My pitch curves are all 0-25-50-75-100. Haven't even started modifying those yet.

Skids
07-28-2009 07:48 PM
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bumper
Heliman
Location: arvada co

My Posts This: Topic  Forum		Check to see that the servo arms are at 90 degrees when the stick is in the middle. The pitch curve you described is for the idle up modes. For a normal flight mode I would try 45-47.5-50-75-100. Try this setting and I think you will be alright. Let us know and we will get you going.

Beam Team
07-28-2009 08:16 PM
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MtnMac
Heliman
Location: Roseville, CA, USA

My Posts This: Topic  Forum		Thanks, Bumper. The pitch arms are exactly 90° at middle stick, at which I have a good 8° of negative pitch. Because of that, I think the issue is mechanical, not a transmitter setting.

Skids
07-28-2009 10:38 PM
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turbojoe
Senior Heliman
Location: Mesa, Arizona

My Posts This: Topic  Forum		John,

Just want to clear up a few setup things. Your swash is level at pitch curve 50 and approximately 10mm (3/8" clearance between it and the upper bearing block, right? With the swash properly leveled your washout arms are perfectly level, right? If so then you need to adjust link "B" to bring your blade pitch into spec. That's really the only option unless something is assembled wrong. I just measured my "B" link and I get 24.7mm outside edge to outside edge. The spec is 25mm.

Can you post a close up side view picture showing only from the top bearing block to the head button? That would help us to see where a problem may exist.

Trust me. We all want you to get in the air as soon as possible so you can see just what we've all been raving about. If we can help you get there then we'll be just as happy as you!

Joe

P.S. I have absolutely no idea why the picture of my Beam is in this post. I can't seem to figure out how to remove it!



I reject your reality and substitute my own...........
07-29-2009 12:35 AM
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MtnMac
Heliman
Location: Roseville, CA, USA

My Posts This: Topic  Forum		Thanks, Turbo. I'll take these measurements when I get home and post a photo for you. I'm eager to fly this thing. It's beautiful.

Skids
07-29-2009 12:51 AM
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turbojoe
Senior Heliman
Location: Mesa, Arizona

My Posts This: Topic  Forum		John,

We're eager as well. I'm a crappy heli pilot but have been a mechanic all my life and love mechanical challenges. That's why I got into helis. I can set 'em up. I just can't fly 'em worth a damn.

Keep posting away with your progress. I stay fairly close to the computer and can take any measurements from mine that may help you out. I'm sure others are willing to do the same.

Joe

I reject your reality and substitute my own...........
07-29-2009 01:03 AM
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turbojoe
Senior Heliman
Location: Mesa, Arizona

My Posts This: Topic  Forum		Looks like I finally got my heli picture out of the post. Had to clear the clipboard from my last picture post. Duh!

Joe

I reject your reality and substitute my own...........
07-29-2009 01:05 AM
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Heli Bob
Veteran
Location: Puerto Rico,Carolina

My Posts This: Topic  Forum		Mtn

did you check the atv (pitch) is 100% up and down

Beam E4,scorpion 2221-6 11t,A123 battery,Scorpion 55amp ESC,Carbon blades
07-29-2009 07:42 PM
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MtnMac
Heliman
Location: Roseville, CA, USA

My Posts This: Topic  Forum		Guys, thanks for all chiming in here. Turns out the answer's as simple as I hoped; I just didn't expect it. My servo-to-swash links, while conforming exactly to the manual, are too short by almost five millimeters. That's a lot, but it's correct. I watched the Finless build vid last night, and his head looked EXACTLY like mine, which he corrected by lengthening the links. This gave him enough pitch range to achieve +13° -13° — more than I'll be using (11°) — without binding or touching any surfaces.

Skids
07-29-2009 08:18 PM
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kennethw
Senior Heliman
Location: Singapore

My Posts This: Topic  Forum		Just saw this post and was going to say adjust the length of the links between the Servo and the Swash. One reason for this is that different servo manufacturers have different positions for the actual servo arm.

If you look at the manuals for Hirobo helis, they have a table for the link lengths according to the brand of the servo.

Regardless, the settings in the manual are only guidelines. All mine are pretty much different from the manual. I check that the Swash, Washout, ...etc. are all parallel at mid-pitch.
07-30-2009 03:03 AM
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supra6
Heliman
Location: Singapore

My Posts This: Topic  Forum		Just curious, all the servos I have ever seen have the output shaft centered width wise in the case, relative to the mounting wholes, it ssems to me that the only adjustments needed for a specific servo would be the length out from center on the arm and either insde or out side of rthe ball?
Th eissue here was the directions are wrong, there was acorrection printed someplace but I don't remember where.
07-30-2009 03:35 AM
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Heli Bob
Veteran
Location: Puerto Rico,Carolina

My Posts This: Topic  Forum		Mtn
can you post some pics of what you,re saing i cant folow what youre saing. and were can y see that vid that you were talking about can i see it.

Beam E4,scorpion 2221-6 11t,A123 battery,Scorpion 55amp ESC,Carbon blades
07-30-2009 04:39 PM
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kennethw
Senior Heliman
Location: Singapore

My Posts This: Topic  Forum
Quote 
Just curious, all the servos I have ever seen have the output shaft centered width wise in the case, relative to the mounting wholes, it ssems to me that the only adjustments needed for a specific servo would be the length out from center on the arm and either insde or out side of rthe ball?
Th eissue here was the directions are wrong, there was acorrection printed someplace but I don't remember where.

Yes, all servos that I have are also centered width-wise. However, they might not be length-wise. Since the Beam places it's servos vertical, the length-wise differences required makes the difference.
07-31-2009 03:16 AM
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supra6
Heliman
Location: Singapore

My Posts This: Topic  Forum		Man do I hate it when I miss the obvious, thanks.
08-03-2009 03:09 AM
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kennethw
Senior Heliman
Location: Singapore

My Posts This: Topic  Forum
Quote 
Man do I hate it when I miss the obvious, thanks.

hahaha ... no problem, I miss it all the time too. Only yesterday I figured out how to resolve a bearing binding issue that I have been having for 6 months and forcing the heli to fly ...

Noticed that you are in Singapore too, where do you fly?
08-03-2009 04:53 AM
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e-BEAM Beam E4 > What am I overlooking?
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