P51 Oops
31 Aug 2017 18:05 #1
by Klipkopwildlife
Do it now, you may never get another chance
Been flying was created by Klipkopwildlife
I like following your exploits too Eric.
I, on the other hand have not been flying, I want to maiden this
3 days ago it was windless but I decided to check the Wattage, I found the Lipo was sagging badly under load (30watts). Fitted a new battery and now I'm getting 120W for a 367gm all up weight. That 150W/lb, should be ok, now all I have to do is wait for the wind to drop.
I, on the other hand have not been flying, I want to maiden this
3 days ago it was windless but I decided to check the Wattage, I found the Lipo was sagging badly under load (30watts). Fitted a new battery and now I'm getting 120W for a 367gm all up weight. That 150W/lb, should be ok, now all I have to do is wait for the wind to drop.
Do it now, you may never get another chance
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01 Sep 2017 09:21 #3
by Klipkopwildlife
Do it now, you may never get another chance
Replied by Klipkopwildlife on topic Been flying
Well that didn't go well! Flew the Liberty first off, just to make sure my fingers knew what to do. Then Mary hand launched the P51. I was in trouble from the get go, Using half the recommended rates, 60% Expo on all functions, and the CoG exactly as recommended the ailerons were very very sensitive but usable, the elevator was just ridiculous, just the slightest touch and she was aiming for the sky or ground, with nothing in between! My adrenalin level is still too high an hour later. Luckily it's repairable. I suspect a recheck of the recommended CoG is in order and reduce all throws further.
Do it now, you may never get another chance
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01 Sep 2017 10:33 - 01 Sep 2017 10:35 #4
by Eric
if you are calm and collected when all about you are going berserk - you've missed something important!
Replied by Eric on topic Been flying
Ouch! 
These lightweight foamy Mustprangs are very nervous models anyway, and it seems that you are too, now!![[badass]](/media/kunena/emoticons/bad_boys_20.gif "[badass]")
I'd suggest you try the CoG under the second panel-line back on the wing - ie just behind where the 'legs' plug in, and try it there.
They are also prone to flipping over on landing (as was the real one!), sometimes breaking the prop, so have a few spares in stock!
-
Teaching granny, but don't forget to balance your (any) low-winger inverted!
These lightweight foamy Mustprangs are very nervous models anyway, and it seems that you are too, now!
I'd suggest you try the CoG under the second panel-line back on the wing - ie just behind where the 'legs' plug in, and try it there.
They are also prone to flipping over on landing (as was the real one!), sometimes breaking the prop, so have a few spares in stock!
-
Teaching granny, but don't forget to balance your (any) low-winger inverted!
if you are calm and collected when all about you are going berserk - you've missed something important!
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01 Sep 2017 11:05 #6
by Quorneng
Replied by Quorneng on topic Been flying
I appreciate the picture is 'post crash' but if the elevator position is anything to go by it could be part of the pitch problem.
With the elevator in that sort of position coupled with a flat board tail plane and what looks like a pretty thin wing could mean that as it speeds up it looses whatever pitch stability it might have had.
I may be in a minority but I am cautious about using expo particularly on a maiden. With unknown flight sensitivity there is a danger that expo actually achieves the opposite of what is intended. Little stick movement (being cautious) no reaction, a bit more stick (still being cautious) not much happens, then a bit of panic (it is after all a maiden!) rather more stick and everything happens.
If the plane is naturally sensitive then without expo the first application of just a bit of stick generates an immediate effect so no problem and you just don't apply any more!
If the plane does not naturally respond to the initial stick movement then there is at least a chance that the control surfaces are 'mild' and applying lots of stick in a maiden 'panic' will not result in anything too drastic leaving you free to crash in the normal way.
.
I like to use expo to 'tone down' known flight characteristics to make the plane 'nicer' to fly.
If it is that sensitive I need expo to effectively fly it then something is wrong with me or the plane or both!
With the elevator in that sort of position coupled with a flat board tail plane and what looks like a pretty thin wing could mean that as it speeds up it looses whatever pitch stability it might have had.
I may be in a minority but I am cautious about using expo particularly on a maiden. With unknown flight sensitivity there is a danger that expo actually achieves the opposite of what is intended. Little stick movement (being cautious) no reaction, a bit more stick (still being cautious) not much happens, then a bit of panic (it is after all a maiden!) rather more stick and everything happens.
If the plane is naturally sensitive then without expo the first application of just a bit of stick generates an immediate effect so no problem and you just don't apply any more!
If the plane does not naturally respond to the initial stick movement then there is at least a chance that the control surfaces are 'mild' and applying lots of stick in a maiden 'panic' will not result in anything too drastic leaving you free to crash in the normal way.
.I like to use expo to 'tone down' known flight characteristics to make the plane 'nicer' to fly.
If it is that sensitive I need expo to effectively fly it then something is wrong with me or the plane or both!
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01 Sep 2017 16:01 #9
by boz
Replied by boz on topic Been flying
Just a thought, from a non flier!, I haven't noticed you posting in the been flying thread lately, and I know you have been poorly, but could it be that your just a little rusty?, shoot me down when you repair the p51. Glad your better, boz. 
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01 Sep 2017 16:38 #10
by Eric
if you are calm and collected when all about you are going berserk - you've missed something important!
Replied by Eric on topic Been flying
A little rusty - - like the tools in his 'shed'!
Klippy DID say he flew the Liberty first, to get his fingers going.
Klippy DID say he flew the Liberty first, to get his fingers going.
if you are calm and collected when all about you are going berserk - you've missed something important!
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03 Sep 2017 08:36 #15
by Klipkopwildlife
Do it now, you may never get another chance
Replied by Klipkopwildlife on topic Been flying
With everything taped up ready for glue.
.JPG)
You can see the elevators are neutral.
.JPG)
And the rudder!
You can see the elevators are neutral.
And the rudder!
Do it now, you may never get another chance
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