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btripp
Joined: 21 Aug 2008
Posts: 6
Location: Wasington
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 Posted: Tue Oct 21, 2008 6:47 am Post subject: elevator balance |
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We are in the final stages of assembling our MYSTERIOUS MOOSE at a hangar in Arlington Airport. Most of the problems we have encountered we have been able to resolve in one manner or another. However, here is one which seems to be a puzzle. We put our elevator on a bench to do a balance test and found that the elevator was balanced aft the hinge line to the point that it would require 6 1/2 to 7 pounds of additional weight at the forward edge of the Ballance horn to create a balanced state. Normally, it is desired to have neutral to a slight forward balance state. When we queried Murphy, they said that this was the design point in all the Murphy Moose kits. So now, our question is-- did any of you check your balance point before you installed the elevator, and if so, what was your balance condition?
When we checked back against the original elevator installation drawings, we realized that our weights are installed in a somewhat different location than what's called out in the drawings. If anyone out there also has the weights in their possession before they've been installed, would you weigh them for us and also take a picture of their configuration.
It may be that this is not a problem, if it's true that all of airplanes have been built and flown in this balance state. However, from the standpoint of flutter, this is a very undesirable configuration. This is our concern, that somehow we have a unique or unusual situation.
We will be consulting with Murphy on this, but so far have not received much useful information.
Blue skies and all the best,
Bob Tripp
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cattoni(at)glastar.ca
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| Posted: Tue Oct 21, 2008 7:25 am Post subject: elevator balance |
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Hi Bob,
My friend and I rare also building a Moose. Here in Kelowna BC Canada.
We do have the exact situation as you encountering, regarding the balance weight of the elevator. So far we could not figure out what to do.
It would be very helpful, if you would let us know, if you come to a resolution of this problem. As you know, communication with Murphy is not the easiest thing now a days.
Thank you for posting. And thanks in advance for keeping us posted.
Best Regards,
Peter Cattoni
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doug(at)ripleyair.com
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| Posted: Tue Oct 21, 2008 8:35 am Post subject: elevator balance |
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Bob and Peter,
The elevators on the Turbine Moose we built were not 100% statically balanced, we used the weights supplied by Murphy installed per the manual. Our elevator was not 100% balanced. I personally have flown that airplane to 150 kts indicated.
I am not an aeronautical engineer....hell, not even sure if I spelled it right. However, do some poking around other airplanes and you will find many without statically balanced elevators. Van's RV types (fast) do have 100% static balance on elevators. My first homebuilt, Midget Mustang, red-line airspeed was 300 mph, it had no static balance weights on the elevators. C-172s have weights but they are not 100% balanced. Keep digging, you'll find many more examples.
Hopefully we can stir up an engineer that can explain why we do or do not need 100% static balance on the elevator.
Doug
www.ripleyair.com
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