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800mm P51 Mustang Issues

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Old 10-13-2010, 02:26 PM
  #1
mbsales
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Default 800mm P51 Mustang Issues

Have the 800mm P51 Mustang from Nitroplanes. After 6 crashs it is not repairable. It never flew for more than 10 seconds before nose dive/crash. I've read about problems with this plane from the wrong CG in the instrctions to the motor not being angled down and to the right.
Before I buy the "Kit" and start over, would appreciate any advise on getting it right.
Andy
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Old 10-13-2010, 04:05 PM
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Default RE: 800mm P51 Mustang Issues

How experienced are you with RC airplanes?

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Old 10-13-2010, 08:15 PM
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Default RE: 800mm P51 Mustang Issues

I had the same thing happen to me with the 800mm p51 and I sent a lengthy email to Nitroplanes.com telling them my situation about the CG not being correct and I got the whole "Crash Policy" bit. I am not very happy with how they handle the airplane being very nose heavy and the CG was also very left roll worthy. Don't expect them to do right by you, they didn't me.
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Old 10-13-2010, 09:29 PM
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Default RE: 800mm P51 Mustang Issues

sorry guys but without details its another urban lengend story like so many online , we need facts
1)Check the current CG vs 25% of max cord near the wing fuse
2)put the plane on the ground , stand over the plane can you see any right thrust in the motor ?
3)look at the plane from the side is there down thrust ?
4)how much movement is in the controls
5)As already asked what is your flight experience
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Old 10-14-2010, 10:59 AM
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Default RE: 800mm P51 Mustang Issues

Exactly...

Unfortunately all too often newbies are enamoured by the prospects of flying an RC plane, never realizing that there is much more to getting the plane airborne.

That is why these forums are repleat with advice from experienced members telling newbies to get help, especially for their first flights.


I had a complete novice, middle age guy show up at our field with a Nitroplanes Yak 54 foamy.

The plane was horridly assembled, everything was out of alignment, and all he could do was get it to nose down and crash.


He kept blaming the plane....

It took me about 10 minutes to correct most of his issues, then I flew the plane performing 3D stunts, much to his surprise.

I then gave him advice on a foamy trainer... unfortunately I never saw the guy again.

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Old 10-14-2010, 08:22 PM
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Default RE: 800mm P51 Mustang Issues

Somehow my post got deleted...probably on purpose. I have been flying anything and everything since 2002. I own a raptor 60, raptor 30, mini titan, f16 70mm, park zone p51 micro and several others. Don't question my experience. What is your experience in building these shotty products?
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Old 10-14-2010, 10:54 PM
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Default RE: 800mm P51 Mustang Issues

keep deleting my posts so your company never has the truth to be known
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Old 10-20-2010, 10:13 AM
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Default RE: 800mm P51 Mustang Issues

Here is what you can do to make a good stable flyer out of the 800mm mustang.

Move the CG forward about one quarter inch by moving the battery to the lower compartment in front of the wing. (you will have to lengthen the wire).
Add about 20 % to the area of the horizontal and verticle tail by adding balsa or foam strips to the edges.
Put wash out to the wing tips (about 2-3 degrees) by heating with a heat gun and bending.
Adjust both ailerons so that they are up about one eigth inch when neutral. (this will give you more wash out effect).
Cut down on the movement of the elevators and aelerons.

This airplane is very sensitive in pitch because of a short tail moment and it wants to tip stall at low speeds. I did these mods to mine and it flies well now. This sounds like a lot of trouble but it is worth it. You can get water base paints at the art and craft store to paint over your tail work. Let me know if you have questions.
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Old 10-20-2010, 02:05 PM
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Default RE: 800mm P51 Mustang Issues

Not to dis your "fix"...

What you are doing is making the plane more stable than a P-51. ( Not that this is a BAD thing either... )

P-51's DO tip stall, have short tail moments and are known to snap fairly strongly.

This is why they are not good beginner aircraft.


That said, your recommendation on moving the C.G. forward and adding a bit of reflex is all that is really needed for most people.

You can lessen elevator movement a bit to help tame pitchiness, by adjusting the position of the linkages for maximum mechanical advantage.
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Old 12-02-2010, 12:04 PM
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Default RE: 800mm P51 Mustang Issues

I have the 800mm BF109 and Spitfire. On those I put 1/2 oz lead weight (that's 2 1/4 oz squares) under the cowl using Tape.
I understand that the other 800mm arfs are the same.

3/4 oz was too much and 1/4oz was not enough. 1/2oz was the sweet spot.
I'm using everything else stock.
Wire on aileron horns are all the way out
Wire on elevator horn and rudder are one hole from outter most hole.
I'm using stock Tx on them.
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