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xtreme lite landings - 10/28/2006 8:08:08 PM   
plane kissa


 

Posts: 6
Joined: 10/28/2006
From: London surrey, UNITED KINGDOM
Status: offline 		hi there,

i have an extreme lite 3d with a ys 63 in it and with all due respect its the most amazing piece of equipment for the money, the flight charactoristics are unmatched and the stuff you can pull out of it is just not evan funny, but when it comes to landing like most models where you hold a very slight dive angle of attack and then start to level out and then flair out, but on this when you idle back the model pitches high into the air so when you come into landing and you throttle back the model pitches high into the air, so i have to hold forward elevator to refrain the model from staling and the ease off the elevator to land and it does all the flairing for me

does anyone on this form know whether this is the same for theres or they have flown one like this but bearing in mind it fly's straight and level with no trim????

thanks for your help. Tom
       Post #: 1

RE: xtreme lite landings - 10/29/2006 1:33:26 AM   
Wide Open



Posts: 3127
Joined: 9/7/2005
From: Mesa, AZ, USA
Status: offline 		hmm... it might have something to do with the thrust line of the engine and the angle of the wings. the engine probably has down thrust that cancels out this effect when throttle is applied. when you take it off, there is some aerodynamic effect that causes it to pitch up. check the alignment of your wings to the center and also check the elevator to make sure that is angled correctly too. it might just be, though, that it flies so well doing your aerobatic maneuvers because of some offset somewhere, and this stability for aerobatics may go away if you change it to not pitch up. its a very confusing problem you have there

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I can divide by zero.

(in reply to plane kissa)
       Post #: 2

RE: xtreme lite landings - 10/29/2006 4:22:45 PM   
plane kissa


 

Posts: 6
Joined: 10/28/2006
From: London surrey, UNITED KINGDOM
Status: offline 		yeh i no,

but i mean i don't want to chang the flying style 3d wise cos that is its main gole but i was just wondering if anyone else had exerianced this at all but i see where your getting at and i have thought about it to although the alignment of the engine has been checkes a few times and that has drawn a blank.
but what you were saying about the alingment of the wings makes me wonder but should this be true cos it was artf and a very good on at that and all of that was briefly checked at the building stage???

but your right its a confusing one,

thanks for your help wide open you may have brought some light on to the subject.

(in reply to Wide Open)
       Post #: 3

RE: xtreme lite landings - 10/30/2006 2:12:12 AM   
Wide Open



Posts: 3127
Joined: 9/7/2005
From: Mesa, AZ, USA
Status: offline 		well, i was referring to weather or not the wings had a positive or negative pitch on them. like it you looked straight down the wings to the fuselage, does the leading edge seem to point up, down, or is it neutral? if anything what you can do is set up your transmitter so that when you throttle back it adds in a little down elevator. (assuming your transmitter has those functions)

_____________________________

I can divide by zero.

(in reply to plane kissa)
       Post #: 4

RE: xtreme lite landings - 11/1/2006 9:52:51 PM   
JustErik


 

Posts: 564
Joined: 7/19/2006
From: Charlottesville, VA, USA
Status: offline 		I'd describe it as tailheavy, but that's just my opinion. I have an Extra that likes to pitch up when cutting the throttle and moving the cg forward solved it.

just my 2 cents....



[typo]

< Message edited by JustErik -- 11/1/2006 10:00:00 PM >

_____________________________

"Toy airplanes are for people with more money than sense."
- My Ex-wife

(in reply to Wide Open)
       Post #: 5

RE: xtreme lite landings - 11/2/2006 10:36:08 PM   
plane kissa


 

Posts: 6
Joined: 10/28/2006
From: London surrey, UNITED KINGDOM
Status: offline 		no thats fine, its just that if i was to move the cg forward i would loose alot of the 3d prformance throwing it about wise, but i have thought of that but again i have to move my battery right back into the fuselarge to allow for the slightlyer heavyer engine but i do understand what your saying

(in reply to JustErik)
       Post #: 6

RE: xtreme lite landings - 11/2/2006 11:20:24 PM   
dbacque


 

Posts: 385
Joined: 6/3/2005
From: Houston, TX, USA
Status: offline 		Wide Open is right, sounds like a thrust line problem. And the good news is that fixing the thrust line won't effect your 3D capabilities.

Trim the plane out for level flight at full throttle. Make a level pass at full speed and chop the throttle when you pass in front of yourself. Does the plane start to climb?

If so, you have too much down thrust. This down thrust pulls the nose of the plane down and you're adjusting for that with up elevator. Then when you chop the throttle, for example, when you're landing, you've got too much up trim!

The fix is very easy. Try putting a washer between the engine and the motor mount on both of the forward engine bolts (or between the motor mount and the firewall on both of the lower bolts). Then repeat the test. If you still climb when you cut power, you need another washer. And from the sounds of it, you'll probably need more than one.

Once you find the right thrust line, your plane will trim the same at any throttle setting. Sure makes landing lots easier!

Dave

(in reply to plane kissa)
       Post #: 7

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