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Old Sep 20, 2010, 05:11 AM
MYC
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I'm sorry to hear you are having CG problems Kahloq. You did measure that 5" from the LE where it meets inside the fuse, right? I measured mine back from where the pins are down the centerline where the wing halves meet and then used a speed square to translate the balance lines left and right from there. Balanced upside down, mine is quite manageable at this location. I flew mine several times at NEAT this past weekend without issue.
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Old Sep 21, 2010, 06:43 AM
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Yes I measured it against the fuse/wing....same place ur describing.

All of my other ESM planes in this size range use a CG of 110-120mm(2x me-109, fw-190) so having 5"(127mm) for this P-51 didnt seem right to begin with, but went with it because someone said that 5 1/4" worked ok.
Im glad I didnt initially put it at 5 1/4" because I probably wouldnt have a plane now.
Im not dissing anyone at all...but...my opinion is that 5 1/4" is not a recipe for success unless you've got really nimble fingers and dont move the stick but miniscule amounts.
At 5", the plane was managable in the air yet very pitch sensitive, but the powered decent to landing is quite hairy to say the least....considerable amount of porpoising.
I had 60% expo on all surfaces and that was not enough to tame the sensitivity.

As a note...ive been flying warbirds for years and ive got several P-51's.
For ME....that 5" to 5 1/4" is not at all comfortable. But...others may be fine with it. As a note...my larger 80" hangar 9 P-51 has a Cg of 5 1/4"

Ive since added 2 1/4 oz more lead as far forward as I could affix it and thats given me a CG of 121mm or 4 3/4" measured directly down the centerline of the wing.
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Old Sep 21, 2010, 07:11 AM
MYC
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I'm with you Kahloq. If you are comfortable at 4 3/4 than that is where you should fly it. I'm sure it will fly fine there. That extra 1/4" forward should add some more stability to mine too. I don't have any expo on my elevator and at half (my half ) flaps mine almost descends hands off. That said, I'm gonna move my cg forward a bit too and see if I like your position better. There are several pix from my flights this past weekend at the NEAT fair here on RCGroups and although I don't know where in my routine I was at when they were taken, the tail does seem a bit low... like in the pic below... nose is high but ele is down.

In this thread are some other pix of her from the fair

http://www.rcgroups.com/forums/showt...1309684&page=4
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Old Sep 21, 2010, 09:10 AM
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Pix look great, how far is the neat fair from the island?
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Old Sep 21, 2010, 09:55 AM
MYC
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its about 3.5hrs northwest... more pulling the 20+ planes and 12' trailer!
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Old Sep 22, 2010, 10:05 PM
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Mark,
Loved your 'stang! Here's yet another photo of it from NEAT.....
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Old Sep 25, 2010, 05:19 AM
MYC
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Nice pic Pete. It was great to meet you.
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Old Sep 25, 2010, 01:37 PM
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Mark:

Here are the 3 I posted in the NEAT Fair photo thread.
By the way, thank you for the Name Tag but Tom asked that I not use it if I wanted a Press Pass. Guess which won out. I would have worn it with pride.

Peter M:

You are holding out I see. You should post some of your photos in the NEAT Fair photo thread.

TA Ta for now.

Paul
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Last edited by datazman; Sep 25, 2010 at 01:50 PM. Reason: add content
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Old Sep 25, 2010, 02:21 PM
MYC
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first pic is now my desktop background Paul! Thank you very much. You are one heck of a photographer my friend
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Old Sep 30, 2010, 01:00 PM
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gilbert,az
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Got a flight in today, sorted out the cg. Had to move one of my flight packs slightly foward to compensate for the extra tailweight for the tail retract. Still can't figure out how to slave aux 2 to my retract channel. When I set up a mix it doesn't work? No big deal, just have to remember to hit 2 switches. Thinking about adding the same mod to my 1.50 p-47, would be real easy!
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Old Oct 02, 2010, 08:55 PM
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mpope1
It was cool to see your mustang fly today down at Speedworld. That take off had me worried, But you did a nice job saving it. Looks like it has plenty of power. Well done! TW
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Old Oct 02, 2010, 09:19 PM
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gilbert,az
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Yeah, take off was a little bit of a surprise. I just took the tires off and added a washer to get them off the struts a little. The plane is so heavy that I think the axles may be bending slightly. Gonna keep my eye on it!
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Old Oct 17, 2010, 11:44 PM
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Australia, VIC, Wyndham Vale
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I am ready to install or set up my lipos i was going to go with the 2x25c 5000 22.2v zippys. but the weight could be and issue. i did notice that mpope1 is running a 4 cell and 6 cell together. if i do this do they have to be the same voltage?

Paul
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Old Oct 18, 2010, 05:46 AM
MYC
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No Paul. MaH needs to be the same. A 6s 5000 and a 4s 5000 consist of the same cells there are just 6 of them in one and four in the other so when you wire them in SERIAL you get 10s 5000. DO NOT wire them in PARALELL as that will be really bad for the 4s pack and push it rather quickly over its max voltage.
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Old Oct 18, 2010, 07:44 AM
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Australia, VIC, Wyndham Vale
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Ok thanks mate now i know what to do. one other thing i need to ask for my speed controller i am useing the turnigy programing box and its asking how many pole is my motor. i have not idea what this means.

this is my motor http://www.hobbycity.com/hobbycity/s...idProduct=3890
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