|fly boy3||13/06/2018 16:52:53|
3229 forum posts
Hi all, my OD model (similar to Acrowot) flies well and I am pleased with its performance. One little niggle is that it seems I need a lot of elevator in turns compared to my other models. Could this be a CoG problem ? Thanks
|Denis Watkins||13/06/2018 17:08:46|
|2906 forum posts|
Usually, it is too little aileron FB
Are yours t design max?
|john stones 1||13/06/2018 17:36:44|
9680 forum posts
Could be that simple, or other reasons, picture of it would help.
Could also be that it just needs more elevator, and nothings wrong.
Edited By john stones 1 on 13/06/2018 17:42:47
|Percy Verance||13/06/2018 17:58:43|
6742 forum posts
It needn't necessarily be anything *wrong* fly boy. It may just be peculiar to that particular model, in the same way that different cars need more steering input than others etc...
Try moving the C of G back a touch to see if it makes any difference. If that upsets other aspects of the handling - such as the landing approach - then move it back to it's previous position and simply increase the elevator movement a touch.
|Biggles' Elder Brother - Moderator||13/06/2018 23:13:16|
15420 forum posts
If the aircraft generally flies well, is reasonably responsive and flairs OK on landing, then its very unlikely to be a CoG issue.
As Percy says aeroplanes can be quite different about this. Just as one or example among many possible factors one effect at play is the length of the tail moment. If the aircraft has a very long tail then the the elevator has a lot of leverage so small movements do the business. But if on the other hand the tail is very short the elevator has little lever length to work on and so larger elevator forces (and hence movements) are needed.
I'd follow the age old engineering wisdom of "if it ain't broke, don't fix it" in this case!
|Peter Jenkins||14/06/2018 00:05:39|
|995 forum posts|
FB3, when you fly the aircraft inverted do you need a lot of down elevator to keep it flying level? If yes, then you have a forward CG and could usefully inch it rearwards until you feel the aircraft is flying better. You will know when you have gone a tad too far when you don't need any down elevator to keep level when inverted or even to have to use up elevator to prevent the nose from rising. The aircraft will still fly fine but it just won't feel right at this point. Main thing is to only move the CG by a small amount each time.
|fly boy3||14/06/2018 03:03:02|
3229 forum posts
Thanks for all the informative gen on my query. As BEB says,if happy leave alone lol.I think I will try the inverted test though as suggested byPeter and see where I go from there. Thank you all. Cheers
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