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Old Apr 18, 2012, 08:21 PM
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United States, NC, Chapel Hill
Joined Sep 2009
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My elevator looks funny.

I am new to EDF, so before I get on the phone with Tower I thought about asking the experts first. I just received the GP F-86 micro edf today. Everything checks fine, except I noticed that the split elevators do not move the same amount.
At maximum deflection (up or down), the right side elevator moves about 1/8', the left side about 1/4' . The manual gives 1/4' for the elevator throw. I have not flown it yet, and do not want to fly it if this is not ok. My feeling is that someone goofed up hooking up the control surfaces to the servo, but I wonder
if this differential displacement is in fact needed to counteract engine torque or whatever. As I said, I am new to EDF.
Thanks
Alberto
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Old Apr 18, 2012, 08:31 PM
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United States, MI, Livonia
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Quote:
Originally Posted by ululi1970 View Post
I am new to EDF, so before I get on the phone with Tower I thought about asking the experts first. I just received the GP F-86 micro edf today. Everything checks fine, except I noticed that the split elevators do not move the same amount.
At maximum deflection (up or down), the right side elevator moves about 1/8', the left side about 1/4' . The manual gives 1/4' for the elevator throw. I have not flown it yet, and do not want to fly it if this is not ok. My feeling is that someone goofed up hooking up the control surfaces to the servo, but I wonder
if this differential displacement is in fact needed to counteract engine torque or whatever. As I said, I am new to EDF.
Thanks
Alberto
Is it right NO but is it NORMAL I think so. I'm sure they are all like this both mine are, because of the way the left and right sides are driven by the servo the right one has a U connector to the servo arm and it flexes to much..

Note,, make sure you have the CG balance set right,, NOT to where it says in the GP manual.. If you got the 250 battery with it just make sure that one you Velcro it down and two it's all the way forward as you can get it... EDF's don't have any prop blast to save your ass,, so you need to keep the speed up at all times..
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Old Apr 18, 2012, 08:35 PM
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Originally Posted by livonia bob View Post
Is it right NO but is it NORMAL I think so. I'm sure they are all like this both mine are, because of the way the left and right sides are driven by the servo the right one has a U connector to the servo arm and it flexes to much..
So am I ok to try it?
Alberto
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Old Apr 18, 2012, 08:37 PM
mjp
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Yep the batteries are charged
I will try dropping the trim all the way down
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Old Apr 18, 2012, 08:40 PM
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Originally Posted by ululi1970 View Post
So am I ok to try it?
Alberto

Yes I think so.. If you can set up full travel on the elevator, and about 50% EXPO for your first flight.. You might find that it will want to go up,, if it does force the nose down with full down elevator if needed. If you can't force the nose down get ready for a flip flop as the airspeed drops off as it's going vertical. Try to get it back on the ground in one piece and stick a Dime on the battery.. Or better yet do that first.. And then you can later try it with out the Dime..
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Old Apr 18, 2012, 09:27 PM
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Adelaide, Australia
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Alberto, your pushrod is flexing (inside the model) under the load of the right elevator. It(elevator hinge) may be a little stiff so while holding the elevator full up, flex the elevator a little more up and do the same thing while the elevator is down. Repeat this a few times to loosen up the hinge.
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Old Apr 18, 2012, 09:45 PM
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Originally Posted by NitroCharged View Post
Alberto, your pushrod is flexing (inside the model) under the load of the right elevator. It(elevator hinge) may be a little stiff so while holding the elevator full up, flex the elevator a little more up and do the same thing while the elevator is down. Repeat this a few times to loosen up the hinge.
But be sure to disconnect the elevator pushrods before flexing the elevator...Just an FYI...

Kevin
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Old Apr 18, 2012, 09:48 PM
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But be sure to disconnect the elevator pushrods before flexing the elevator...Just an FYI...

Kevin
Heck if your going that far move the right one up a hole..
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Old Apr 18, 2012, 10:21 PM
"Add Lightness"..Colin Chapman
Keystone State, USA
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Livonia Bob,

YOu keep mentioning to NOT use the CG recommended in the manual, which I believe is 70mm from the leading edge....

Could you tell us, or me, what CG should be used then????

Ululi1970,
My elevator acts the same as you described for yours. It has not been noticeable in flight. The main problem with my elevator is
that it is is slightly off center. I need about 2 or 3 clicks of up elevator trim to get it to fly without it diving slightly. I would like to adjust it mechanically but looks as if it would be kind of difficult. I think I can live with 2 clicks of elevator trim.
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Old Apr 18, 2012, 10:26 PM
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Originally Posted by livonia bob View Post
Heck if your going that far move the right one up a hole..
C'mon Bob---Seriously?!?!???...This is not the way to solve this problem...Just another way to make an airplane fly skewed in a loop or applying any up/down elevator as a matter of fact...I can't believe that you actually recommended this...You can't be serious---If you are then I FULLY understand why you've had as many problems with this plane...Again---SERIOUSLY?????

Kevin
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Old Apr 18, 2012, 10:46 PM
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Originally Posted by Kevin Greene View Post
C'mon Bob---Seriously?!?!???...This is not the way to solve this problem...Just another way to make an airplane fly skewed in a loop or applying any up/down elevator as a matter of fact...I can't believe that you actually recommended this...You can't be serious---If you are then I FULLY understand why you've had as many problems with this plane...Again---SERIOUSLY?????

Kevin
As no mater how loose you make the right side hinges the flex in the "U" will not give full travel under air loads which is what counts.. So one way to make them even in flight is to have the right one set to travel more to allow for the flex at the "U"..
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Old Apr 18, 2012, 10:50 PM
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Originally Posted by Elisecat View Post
Livonia Bob,

YOu keep mentioning to NOT use the CG recommended in the manual, which I believe is 70mm from the leading edge....

Could you tell us, or me, what CG should be used then????

Ululi1970,
My elevator acts the same as you described for yours. It has not been noticeable in flight. The main problem with my elevator is
that it is is slightly off center. I need about 2 or 3 clicks of up elevator trim to get it to fly without it diving slightly. I would like to adjust it mechanically but looks as if it would be kind of difficult. I think I can live with 2 clicks of elevator trim.
You can read the corrected manual here.. It's still 70mm but they tell you to measure it from the top looking down at where the leading edge meets the fuse,, we want you to turn the plane over and go 70mm from where the LE on the bottom meets the fuse..

http://www.rcgroups.com/forums/showthread.php?t=1594808
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Old Apr 18, 2012, 11:02 PM
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United States, TN, Jackson
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Originally Posted by livonia bob View Post
As no mater how loose you make the right side hinges the flex in the "U" will not give full travel under air loads which is what counts.. So one way to make them even in flight is to have the right one set to travel more to allow for the flex at the "U"..
Ohh Jeeez!!!...."Sound of palm of hand slapping my forehead---HARD!!!".........Just flex the hinges and both sides of the elevators will travel equally....Introducing other control throw issues isn't going to help at all....

Kevin
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Old Apr 18, 2012, 11:13 PM
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Gilbert, Az
Joined Jun 1999
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I just added a second servo to my F-86 build. Eliminated the problem. I have a stock one also. The parts built one is better I think with the 2nd servo.
Bob
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Old Apr 19, 2012, 07:05 AM
"Add Lightness"..Colin Chapman
Keystone State, USA
Joined Jun 2007
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Quote:
Originally Posted by livonia bob View Post
You can read the corrected manual here.. It's still 70mm but they tell you to measure it from the top looking down at where the leading edge meets the fuse,, we want you to turn the plane over and go 70mm from where the LE on the bottom meets the fuse..

http://www.rcgroups.com/forums/showthread.php?t=1594808
Ok Thank you.

I measured mine initially using the LE on the BOTTOM of the plane so I think I did it right from the start. However, mine does not balance there. With 2gm added weight in the nose (where it flies just ABOUT perfectly) mine balances probably in the range of 65-67mm from the leading edge on the bottom of the fuse.

Does anyone have any tricks for getting the pushrods out of the control horns? They both seem very stiff and brittle. Afraid if I try to move a pushrod to a different hole I'll destroy the whole thing....
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