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Great Planes Revolver 70 Lateral Balancing Question...

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Great Planes Revolver 70 Lateral Balancing Question...

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Old 03-01-2014, 08:04 AM
  #1  
GIMBELOCK
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Default Great Planes Revolver 70 Lateral Balancing Question...

Finished building my Revolver 70 and I'm stumped. I balanced the plane, nose to tail, by moving the battery like normal and using the suggested balance point and all is fine. However, it also recommend lateral balancing, nothing new, it's just that it heavy to the pilots left wing and needs more than 1.5 oz in the right wing tip to balance out. I tried to balance with my wife, having her hold onto the prop at the 12 O'clock position and me putting my fingertip on the very end of the fuselage, it rolled hard left. Considering the wing is foam core with balsa over and then monokote finish. It just seems that it would be hard to be off by that much and need almost 1.5 oz on the right wing tip on such a simple wing construction. I'll admit I haven't weighted both wings yet to see if there is an abnormality. Layout inside the plane seems to be fairly even weight wise. Plus being near the center axis shouldn't affect things as much.

I FEEL LIKE A ROOKIE!!! I'm just afraid to add the weight and then have a VERY INTERESTING maiden.

Thanks for any help.

GL
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Old 03-01-2014, 08:00 PM
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bob62
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I have one of those and did not have any balance problems
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Old 03-01-2014, 09:35 PM
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Originally Posted by GIMBELOCK View Post
...........
Thanks for any help.

GL
Welcome to RCU !!!

It needs what it needs; better a little heavier than out of lateral balance.

However, repeat the balance upside down, just to be sure that the CG is lower than the line between both points of support.
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Old 03-02-2014, 07:23 AM
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Originally Posted by Lnewqban View Post
Welcome to RCU !!!

It needs what it needs; better a little heavier than out of lateral balance.
Thanks Lnewqban! Been more of a registered lurker for awhile. Should go introduced myself.

Your right in what you said....it does just " need what it needs" for whatever reason it is out of balance, it needs to be corrected. I tried your suggestion...it still rolled to the heavier side. I drilled the wing and epoxied in some thin long sinker lead. 3/16 th x 4 " and it leveled out perfect. Put a little Monokote patch over it and she's ready for a maiden.

Thanks again for your input.

GIMBELOCK
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Old 03-02-2014, 04:11 PM
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Originally Posted by GIMBELOCK View Post
........Thanks again for your input.
You are welcome

Most pilots don't bother fixing an axial unbalance.
Those will correct the tendency with aileron trim, which works at high speeds, but then the wingtip tends to drop during landings or slow flights.
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Old 03-03-2014, 08:18 AM
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yupper ... if you have any interest in aerobatics, lateral balancing is a MUST.
(think of an inside loop vs an outside loop with one wing heavy, and trimmed out with ailerons...)

sealing the hinge gaps are another one to pay attention to. (aerobatics and symmetry)

good luck!
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Old 03-06-2014, 10:02 AM
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Mr.Buzzeo!! I have to thank you for your review of the Reactor .61 bipe. Your review made me want one and I LOVE IT!!! Thanks for your write up.

Thank you all for your input. I appreciate it.

GIMBELOCK
(Les Shupe)
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Old 03-06-2014, 11:44 AM
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Originally Posted by GIMBELOCK View Post
Mr.Buzzeo!! I have to thank you for your review of the Reactor .61 bipe. Your review made me want one and I LOVE IT!!! Thanks for your write up.

Thank you all for your input. I appreciate it.

GIMBELOCK
(Les Shupe)
Hey Les!
actually that was my late Brother Mike's (minnflyer) review, Although I did help out with some of the flying.
once the videos were complete he let me 'trim it out' for him...
after a month I finally gave it back... LOVED that airplane!
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Old 03-07-2014, 08:30 AM
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I very sorry to hear about your brother. I've never met or have spoken to him, but after seeing his picture and reading his review he seemed like a great guy with a definite passion for his hobby. I bought my plane more than 4 years ago solely because of his write-up, it just hit a cord with me. I've put HUNDREDS of flights on that plane and it looks and flies like new. I was excited when I seen your reply...thinking it was Mike. I wanted to tell him how much I appreciated his work. Again...sorry for your loss.. and thanks for your time.

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Old 03-07-2014, 09:23 AM
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no worries, Les... (Our Dad sort of ingrained all his kids with the airplane thing and helping out anywhere we can)
I've got a pretty good idea Mikey knows he was greatly appreciated.
the guy was pretty doggone good with a camera and photoshop too
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Old 03-07-2014, 10:24 AM
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Gimbelock, when you do a static balancing for lateral balance, instead of holding the prop and estimating 90 degrees, try removing the prop entirely. Place the prop shaft on a table to support the nose end and then hold the plane by the tip of the tail (not the rudder). This will be more accurate. Of course, flight testing is always required to fine tune the lateral balance.

Like has been said, they need what they need. My Skybolt needed 2 1/2 ounces in the left wingtips even though the wings balanced individually. Likely due to the side mounted OS 1.20 FS.

Dave
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