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Old 01-28-2018, 04:09 AM   #1 (permalink)
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Default Is this right?

I'm getting ready to bolt all the major components together.

I thought I'd check the tail boom fit before I mounted the sub-frame in the monocoque.

I can't get the boom to sit between the clamps. The carbon is flexing farther than I'm comfortable with.

Have I done something wrong? I've tripled checked the manual, I don't believe I have.

I suppose once the clamp bolts are tightened, the whole thing will compress a bit. That and the top clamp halves will be bolted to the sides of the monocoque. I just don't want to break anything
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Last edited by fluxcapacitor121; 01-28-2018 at 05:06 AM..
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Old 01-28-2018, 07:46 AM   #2 (permalink)
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Default Clamps

I too remember that being a problem at first but can not remember the fix. Seems like it had something to do with moving the boom all the way forward without the bottom clamps in place. Then making sure the boom was pressed firmly into the top clamp then adding the bottom clamps. May have even loosened the belt tensioners temporarily. Might even have flexed the bottom clamps a bit by pulling on them. Also make sure the front clamp is not thinner than the back clamp. Might try switching them. Like I said its been a while but once together it fits well.

Chris
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Old 01-28-2018, 11:35 AM   #3 (permalink)
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If you look closely at your picture, the inner and outer frame halves are flexing outward. I think once you start screws into the actual clamping portion of the boom clamps, you will see things go together quite well. Additionally, you are inserting boom without any loading on the inner frame halves. I've done this, too. It works but you have to be extra careful so you do not overload the inner frames. Overloading the inner frame halves can cause them to flex to the point where the holes in the cross members do not align with the holes in the monocoque.

Scott
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Old 01-28-2018, 01:47 PM   #4 (permalink)
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Alright thanks guys.

I'm gonna press on.
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Old 01-28-2018, 08:17 PM   #5 (permalink)
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The boom will be a tight fit no matter what you do. The reason is this: The original design had one plastic and one metal boom clamp. This was because the original boom was thinner than the production boom and because testing revealed some resonance which was isolated to the boom clamps. Changing both clamps to metal and making the boom thicker made the fit tighter. It works.

Scott
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Old 01-28-2018, 11:23 PM   #6 (permalink)
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Interesting. Yeah, it's gonna be tight. I totally see what you mean about installing the boom in the clamps without the monocoque. The clamps will be held perpendicular to the boom when I actually assemble it.

Since you mention boom resonance...

I'm trying to decide where to mount my vbar sensor. This heli is clearly designed for a all-in-one flybarless. I'm determined to install a silverline vbar, though I might have to find a used mini.

The best place I've found (or worst for all I know) is just above the boom, inverted, between the 2 upper boom clamp halves. Photo attached.

Am I asking for vibe trouble here? I've run the silverline on nitros with the thinnest of tape. I have the same sensor, inverted, under the main aluminum plate of my goblin. Same plate that holds the motor, main shaft, and gear shaft. Sab recommends that location though.

I'm sure the flybarless mount on the exo is properly isolated from vibes, but it's a little small for 2 components. If I put the sensor on there, I'm gonna be shoe-horning the control unit somewhere.
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Old 01-29-2018, 01:42 AM   #7 (permalink)
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Why not put the sensor on the mount intended for the FBL unit, and the other component of the V-Bar elsewhere?

One approach might be to install a second gyro tray-I did this for my antenna mount and it works well. The other part of your V-Bar could go on the second gyro mount:

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Old 01-29-2018, 11:04 AM   #8 (permalink)
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I like that idea.

Do you have a pic of the 2nd tray?
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Old 01-29-2018, 04:27 PM   #9 (permalink)
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Fulx I spent hours trying to fit the VBAR. The sensor needs to go on the gyro sensor tray. Put the control box like I have it in the pics I sent you Its easy to get to and adjust.

Chris
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Old 01-29-2018, 11:46 PM   #10 (permalink)
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Yeah man.

I think how you did it is the only way. If I put that sensor over the boom and have vibes, it's gonna be a major project to get it out. Worse yet, if it falls off in flight.

Thanks again for the pics.
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Old 02-01-2018, 09:45 AM   #11 (permalink)
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fluxcapacitor121,

2nd attempt to post photo of 2nd gyro tray...HeliFreak will not allow me to post the photo a second time-not sure where it is elsewhere on HF.

My apologies.
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