Plank help!!!

[PKNEC]

Ok folks could anyone shed some light on to what could have caused my sons P51 Mustang to suddenly bank left then nose dive into the ground.
The aircraft was set up correctly and even after the crash the control surfaces moved as they should so we are stumped as to what happened and he is gutted.
Any info greatly appreciated.

P.S Does anyone have an Art Tech P51 mustang EPO Fuselage they want to sell.

[jimmyhorns]

dodgy aileron servo, or the control of it by the receiver.

Is there a single aileron servo, or one per wing?

[Red3]

didnt have a wing tip stall out did you ?

[PKNEC]

[QUOTE=jimmyhorns;1006718]dodgy aileron servo, or the control of it by the receiver.

Is there a single aileron servo, or one per wing?[/QUOTE]

One per wing.

[COLOR=#333333]didnt have a wing tip stall out did you ?
[/COLOR]
Whats one of those?

[jimmyhorns]

There are many definitions of a wing tip stall, but very simplistically, its when you are turning, and the inside wing is going slower than the outside wing, and slower inside wing then stalls. Instead of the nose dropping initially, it starts with a hard bank, and then the nose dropping.

It could quite possibly be that if your airspeed was low at the time.

I was assuming that you were in normal flight, hence the servo suggestion.

[Streetluge Chris]

How bad is the fuselage ? It's surprising what UHU por will stick back together.I take it it is a foam fuse.

[Red3]

hi i have had planks that in slow level flight want to drop a wing. if you dont drop the nose and gain speed you can stall out the wing that drops will seem to keep going then you end up nose down.

[Liam B.]

Wing stall is quite possible.
But,
Did you do a range check?

As it may have gone out of range, and as you've gone over to it its back in range.
What transmitter and rx were you using?

Liam

[PKNEC]

Both suggestions make sense now Jimmy although the speed of the aircraft did seem ok imo, but it did exactly as you described in the tip stall.
I will get the servo's checked in the wing and after a new fuse is found try again.
Can you recommend any decent 9 gram servos as the one's in the kits never have inspired my confidence.
Thanks for the info Gents at least I can explain to my son what could have happened to settle his mind and boost his confidence back up, as he flies helis no problem.

[PKNEC]

[QUOTE=Liam B.;1006746]Wing stall is quite possible.
But,
Did you do a range check?

As it may have gone out of range, and as you've gone over to it its back in range.
What transmitter and rx were you using?

Liam[/QUOTE]

Range check was fine Liam at 200 yds ish very big field.
Running on Futaba 7c and 617fsRX

What Jimmy and Red 3 have suggested seems to be the issue.

[Liam B.]

[QUOTE=PKNEC;1006748]Both suggestions make sense now Jimmy although the speed of the aircraft did seem ok imo, but it did exactly as you described in the tip stall.
I will get the servo's checked in the wing and after a new fuse is found try again.
Can you recommend any decent 9 gram servos as the one's in the kits never have inspired my confidence.
Thanks for the info Gents at least I can explain to my son what could have happened to settle his mind and boost his confidence back up, as he flies helis no problem.[/QUOTE]

The ones I used to run in a plank elevator was a [url=http://www.fast-lad.co.uk/store/product_info.php?products_id=15009]Savox SH-0262MG Micro Digital Servo[/url] . That as ran in a Glider and it was fine. Also ran one in a rc18t car.

Liam

[jimmyhorns]

a tip stall (wing tip stall) is all the more likely if he was flying it down wind at the time, as the airspeed is a lot less than the ground speed. You dont really need to watch this with helis, though you do like a hawk with planks. There is a tendancy to drop the throttle on the down wind leg, as the perceived speed (ground speed) increases rapidly, but in actual fact, all that does is reduce the airspeed, sometimes to the point of a stall.

[PKNEC]

[QUOTE=Streetluge Chris;1006744]How bad is the fuselage ? It's surprising what UHU por will stick back together.I take it it is a foam fuse.[/QUOTE]

Hi Chris yes it is a foamie and I do have uhu por which would mend the cowling area but it took such a thump on the nose that it's distorted the front end from the front of the canopy, so it now has a permanent bend to the left. unless some knows how to straighten EPO
Would warming it with a hair dryer work?

[Liam B.]

One way was to dip it in boiling water, it would make it have a rough finish but go back to its original shape.

infact,

here is some instructions: [url=http://www.wattflyer.com/forums/showthread.php?t=65933]How to fix warps, dents, twists or uncrunch foam parts - WattFlyer RC Electric Flight Forums - Discuss radio control eflight[/url]

Its worked fine for me before.

[PKNEC]

Cheers Liam thats tremendous.
Just started with the UHU POR