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Balancing machine

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Old 10-15-2018, 06:03 PM
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drube
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Default Balancing machine

Hi guys! What are you guys using to balance your big planes? I have a Great Planes balancer but it isn't strong enough to hold a giant scale plane. I'll need something in the near future for when i'm ready to fly my TF GS Corsair, Jerry Bates giant Astro Hog and my RCM plans built FlyBaby.

Thanks!
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Old 10-15-2018, 09:21 PM
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With help from a friend, a finger at each wing tip.
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Old 10-16-2018, 04:08 AM
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Originally Posted by nmav8r View Post
With help from a friend, a finger at each wing tip.
Simple and effective. I've been using that system for years.

My Hostetler Luscombe Silvaire was too large to use my fingers, though. I used a Vanessa Rig to balance it.

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Old 10-16-2018, 05:31 AM
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I would think it would be a simple matter to make a stand with pivoting wing supports, that the plane sat on. you simply set the wings on the supports and slide the plane fore and aft, until it balances how you want it to with the pivot point of the supports being the balance point on the wing. I would put some type of thin foam rubber on the wing supports that would somewhat grip the underside of the wings for security and use small ball bearings for the wing supports to pivot on. width and height, could be made adjustable. leaves both hands free to work on the plane. if designed right, it could come apart and be stored against a wall to be out of the way. it could also be taken to the flying field for experimenting with balance points on a new plane as you fly it.
hhhmmmm,.....I might just build a prototype for myself......sounds like a good winter project or good club project. might be something clubs might consider having, if they have a lot of giant scale fliers.
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Old 10-16-2018, 06:20 AM
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I like your Vanessa rig. looks like it could be home made or is there special rigging required ?
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Old 10-16-2018, 07:02 AM
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Originally Posted by nmav8r View Post
I like your Vanessa rig. looks like it could be home made or is there special rigging required ?
I made mine at home, from plans found on line. Just Google up "Vanessa Rig" and you'll find everything that you need to know.
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Old 10-16-2018, 07:21 AM
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Trying to use your fingers lacks precision and accuracy. Totally useless and unacceptable. Also, when you get those planes up around 30+ pounds a lousy finger will not support them.

The comment which begins, " I would think..." means that this is someone speculating. No real world experience. Wait until he tests his hypothesis and proceed from there.

In the meantime, follow Mr. Crump's suggestion. It's very common and works.
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Old 10-16-2018, 07:30 AM
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Originally Posted by do335a View Post
Trying to use your fingers lacks precision and accuracy. Totally useless and unacceptable. Also, when you get those planes up around 30+ pounds a lousy finger will not support them.

The comment which begins, " I would think..." means that this is someone speculating. No real world experience. Wait until he tests his hypothesis and proceed from there.

In the meantime, follow Mr. Crump's suggestion. It's very common and works.
Odd. The pads on my Great Planes balancing machine were larger than my fingertips. Now I have small hands but not that small. Seems like advice that starts out like this is what is really "unacceptable".
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Old 10-16-2018, 07:45 AM
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Since we are talking about giant scale aircraft, why not leave the "model techniques" behind and balance like the real aircraft are balanced:

Balancing like the Big Boys - RCUniverse Discussion

Rafael
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Old 10-16-2018, 07:47 AM
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Thanks guys and thanks for the video Tom. I don't want to use my thumbs and is the Vanessa Rig my only option? I'm not sure how it works even after watching the video. I can see how the Vanessa Rig can find the CG point with the plum bob but how do you know if added weight is needed?
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Old 10-16-2018, 07:54 AM
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Originally Posted by Rafael23cc View Post
Since we are talking about giant scale aircraft, why not leave the "model techniques" behind and balance like the real aircraft are balanced:

Balancing like the Big Boys - RCUniverse Discussion

Rafael
Thanks! I will read through that thread.
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Old 10-16-2018, 07:58 AM
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do335a,...i would think it would be easy to build,.......yes I haven't ever built one, I don't fly large scale,. but i'll tell you what,..... when I say "i would think" I am simply being courteous,...I know for a fact that I could build one probably better than most you can buy. for now on, i'll simply say, ...."what, ...you can build an r/c plane but you can't build a simple balancer for it ? ",...maybe that will suit you better. my real world experience takes me far beyond building something as mundanely simple as an airplane balancer, buddy,.....any time you want to compare general knowledge and talent about building things,... anything you can think of,....anything..... i'll be right there .... bring it, let's hear all about what you've built in your lifetime. . I've forgotten about building more things than you have ever thought about building,.... i'm sure of that.
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Old 10-16-2018, 12:51 PM
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Thanks for posting the video Tom! I've been successfully using a Vanessa rig for a few years now, and not just on giant scale planes, but .40 size glow planes too. I like that I can place items like batteries, fuel tanks and electronics loosely on the plane and adjust their position for balance, all before permanently mounting them. I also use an electronic fish scale between the Vanessa and the ceiling hook, so I can get a good, accurate weight in the process.
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Old 10-16-2018, 01:36 PM
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Ok, After watching the video a few times I get it. lol I was having brain farts this morning.

Thanks again!
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Old 10-17-2018, 02:46 AM
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I use this https://www.xicoy.com/catalog/produc...roducts_id=365
It's very accurate but pricey!
Bob
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Old 10-17-2018, 12:04 PM
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Alan, this is what I use, on my giant aircraft that weigh in excess of 35lbs. It doubles as a CG balancing machine and AC stand and is reasonably priced.
Roger

https://vqwarbirds.com/product/vic-rc-cger-stand/
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Old 10-17-2018, 04:11 PM
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Originally Posted by rgburrill View Post
Odd. The pads on my Great Planes balancing machine were larger than my fingertips. Now I have small hands but not that small. Seems like advice that starts out like this is what is really "unacceptable".
The size of the pads is irrelevant, as you can see from ForcesR's post, they could have been the size of dollar bills and it would have worked just as well. The relevant part is the size of the pivot point, which was the size of a small pencil eraser on your Great Planes balancing machine.
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Old 10-18-2018, 08:28 AM
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Originally Posted by ForcesR View Post



Alan, this is what I use, on my giant aircraft that weigh in excess of 35lbs. It doubles as a CG balancing machine and AC stand and is reasonably priced.
Roger

https://vqwarbirds.com/product/vic-rc-cger-stand/

Thanks! That looks like a great option. How do you set the distance from the LE to the CG point? (Like if it was 4" from the LE)
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Old 10-18-2018, 09:20 AM
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Old 10-18-2018, 10:03 AM
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Originally Posted by ETpilot View Post
Thanks for the link!
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Old 10-18-2018, 12:08 PM
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Thanks! That looks like a great option. How do you set the distance from the LE to the CG point? (Like if it was 4" from the LE)

Very easy, just align the mark or tape you placed on the wing at 4" with the "Triangle/Arrow" that is shown just above the centre wingnut in the attached photo.
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Old 10-18-2018, 12:48 PM
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Ok, thanks! Do I still have to balance with the plane upside down?
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Old 10-18-2018, 02:14 PM
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Originally Posted by drube View Post
Ok, thanks! Do I still have to balance with the plane upside down?
Yes, low wing aircraft like fighters are normally balanced upside down. If it's a high wing aircraft like a Cessna, Beaver etc. it's balanced right side up.

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Old 10-18-2018, 03:05 PM
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That's what I thought. But then I seen the vanesssa rig and was confused.
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Old 10-18-2018, 07:49 PM
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vanessa rig is the go. Once you understand how to use it its very easy. Critical is to set inital reference point with spirit level to the attitude you want the aircraft to be flying then each time you adjust you reset to that level again.
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