Stick 40

Hi,


I picked up this P-51 used with a Mintor gas engine on it, I am getting ready to fly it but I think the bal. Point is a little off, I think its to tail heavy for me to fly..
It weights in at about 11 to 11.5 lbs
wing span in 64”
over all length is 52”
the balance point is 6 “ from the leading edge now.
At the fuse the length of the wing fromleading edge to back edge of flap is 12.5” I just got to believe it should be more like 3.5 to 4 in.


I am looking for ID to get info on itor any idea of where the bal. Point should be.

jester_s1

Do a Google search for rc cg calculator. You can put your wing measurements in and get the right CG for any location you want. Start with 25% of the MAC and adjust from there. From your description though, it sounds like this plane is going to be scary heavy. You might do some poking around to see if you can lighten it up a bit.

Luft-Gangster

Looks like the Hangar 9 Blue Nose http://www.hangar-9.com/Products/Def...ProdID=HAN2420

CG on page 33 http://www.horizonhobby.com/pdf/HAN2420-Manual-V2.pdf

da Rock

P51 wings have an extra bit projecting forward at the roots. Since the suggested CG location on the wing is usually measured from the LE of the wing at the root chord, their measurements often seem longer than on most other models that usually have straight LEs.

It looks like the mfg's suggestion is 4 7/8" back. Most models that size often fly safely with the CG within a range of about an inch. But your 6" is probably too far aft. Flying with the CG aft of the suggested location usually works best to have the low rate (of dual rates) elevator about 50% the mfg's suggested throw.

With scale planes that sport retracts, they often are terrible on the ground unless the CG is aft somewhat. They are prone to dig the nose when the wheels encounter any kind of drag, landing, taking off, taxiing, whenever. They really don't allow just any CG location.

Stick 40

big thanks to everyone, I really want to fly this. But I was not going to until I was sure about he CG.

I have all the info, throws , CG , etc.

The plane is getting a little old and has some hanger rash, but most all the real planes in service were not "new looking".

anyway I will get back with how it flys.

sticks